EP1425098A1 - Double metal cyanide catalysts for the production of polyetherpolyols - Google Patents

Double metal cyanide catalysts for the production of polyetherpolyols

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Publication number
EP1425098A1
EP1425098A1 EP02754998A EP02754998A EP1425098A1 EP 1425098 A1 EP1425098 A1 EP 1425098A1 EP 02754998 A EP02754998 A EP 02754998A EP 02754998 A EP02754998 A EP 02754998A EP 1425098 A1 EP1425098 A1 EP 1425098A1
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Prior art keywords
metal cyanide
weight
catalyst
dmc
double metal
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German (de)
French (fr)
Inventor
Walter Schäfer
Jörg Hofmann
Pieter Ooms
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Covestro Deutschland AG
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Bayer MaterialScience AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
    • B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/08—Silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24—Nitrogen compounds
    • B01J27/26—Cyanides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/049—Pillared clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22—Organic complexes
    • B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
    • B01J31/2208—Oxygen, e.g. acetylacetonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22—Organic complexes
    • B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
    • B01J31/2208—Oxygen, e.g. acetylacetonates
    • B01J31/2226—Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
    • B01J31/223—At least two oxygen atoms present in one at least bidentate or bridging ligand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/28—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of the platinum group metals, iron group metals or copper
    • B01J35/615—
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2642—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the catalyst used
    • C08G65/2645—Metals or compounds thereof, e.g. salts
    • C08G65/2663—Metal cyanide catalysts, i.e. DMC's
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
    • B01J2231/10—Polymerisation reactions involving at least dual use catalysts, e.g. for both oligomerisation and polymerisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/02—Compositional aspects of complexes used, e.g. polynuclearity
    • B01J2531/0238—Complexes comprising multidentate ligands, i.e. more than 2 ionic or coordinative bonds from the central metal to the ligand, the latter having at least two donor atoms, e.g. N, O, S, P
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/20—Complexes comprising metals of Group II (IIA or IIB) as the central metal
    • B01J2531/26—Zinc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/60—Complexes comprising metals of Group VI (VIA or VIB) as the central metal
    • B01J2531/62—Chromium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
    • B01J2531/82—Metals of the platinum group
    • B01J2531/827—Iridium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
    • B01J2531/84—Metals of the iron group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
    • B01J2531/84—Metals of the iron group
    • B01J2531/845—Cobalt

Definitions

  • Double metal cyanide catalysts for the production of polyether polyols Double metal cyanide catalysts for the production of polyether polyols
  • the invention relates to new double metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides to active ones
  • Double metal cyanide (DMC) catalysts for the polyaddition of alkylene oxides to starter compounds having active hydrogen atoms are known (see e.g. US-A 3 404 109, US-A 3 829 505, US-A 3 941 849 and US-A 5 158 922).
  • DMC Double metal cyanide
  • DMC catalysts for the production of polyether polyols results in particular in a reduction in the proportion of monofunctional polyethers with terminal double bonds, so-called monools, in comparison to the conventional production of polyether polyols using alkali catalysts, such as alkali metal hydroxides.
  • the polyether polyols thus obtained can be processed into high-quality polyurethanes (e.g. elastomers, foams, coatings).
  • DMC catalysts are usually obtained by combining an aqueous solution of a metal salt with the aqueous solution of a metal cyanide salt in the presence of an organic complex ligand, e.g. of an ether.
  • aqueous solutions of zinc chloride in a typical catalyst preparation, for example, aqueous solutions of zinc chloride (in
  • DMC catalysts are known from JP-A 4 145 123, US-A 5 470 813, EP-A 700 949, EP-A 743 093, EP-A 761 708 and WO 97/40086.
  • Butanol as an organic complex ligand (alone or in combination with a polyether (EP-A 700 949, EP-A 761 708, WO 97/40086)) further reduce the proportion of monofunctional polyethers with terminal double bonds in the production of polyether polyols.
  • the use of these DMC catalysts reduces the induction time in the polyaddition reaction of the alkylene oxides with appropriate starter compounds and increases the catalyst activity.
  • the present invention therefore relates to a double metal cyanide (DMC) catalyst comprising
  • water preferably 1 to 10% by weight and / or e) one or more water-soluble metal salts, preferably 5 to 25% by weight, of the formula (I) M (X) n from the Preparation of the double metal cyanide compounds a) may be included.
  • M is selected from the metals Zn (11), Fe (II), ⁇ i (II), Mn (II), Co (II), Sn (II), Pb (11), Fe (III) , Mo (IV), Mo (VT), AI (III), N (N), N (IN), Sr (II), W (IN), W (NI), Cu (II) and Cr (HI) , Zn (LT), Fe (II), Co (II) and ⁇ i (IT) are particularly preferred.
  • the anions X are the same or different, preferably the same, and preferably selected from the
  • n 1, 2, or 3.
  • the double metal cyanide compounds a) contained in the catalysts according to the invention are the reaction products of water-soluble metal salts and water-soluble metal cyanide salts.
  • Water-soluble metal salts suitable for the preparation of double metal cyanide compounds a) preferably have the general formula (I) M (X) n , where M is selected from the metals Zn (II), Fe (II), ⁇ i (LT), Mn (II), Co (II), Sn (II), Pb (LT),
  • the anions X are the same or different, preferably the same and are preferably selected from the group of halides, hydroxides, sulfates, carbonates, cyanates, thiocyanates, isocyanates, isothiocyanates, carboxylates, oxalates or nitrates.
  • n 1, 2 or 3.
  • water-soluble metal salts examples include zinc chloride, zinc bromide, zinc acetate, zinc acetylacetonate, zinc benzoate, zinc nitrate, iron (II) sulfate, iron (II) bromide, iron (II) chloride, cobalt (II) chloride, cobalt ( ⁇ ) thiocyanate, nickel ( II) chloride and nickel (II) nitrate. Mixtures of various water-soluble metal salts can also be used.
  • Water-soluble metal cyanide salts suitable for the preparation of double metal cyanide compounds a) preferably have the general formula (II) (Y) a M '(CN) b (A) c , where M' is selected from the metals Fe (II), Fe (III ), Co (II), Co (III), Cr (II), Cr (III), Mn ( ⁇ ), Mnttli), Ir (III), Ni (II), Rh (III), Ru (LI), V (IN) and N (V). M 'is particularly preferably selected from the metals Co (II), Co (III), Fe (II), Fe (IÜ), Cr (ILT), Ir (III) and ⁇ i (II).
  • the water-soluble metal cyanide salt can contain one or more of these metals.
  • the cations Y are the same or different, preferably the same, and are selected from the alkali metal ions and earth group comprising alkali metal ions.
  • the anions A are the same or different, preferably the same, and are selected from the group of halides, hydroxides, sulfates, carbonates, cyanates, thiocyanates, isocyanates, isothiocyanates, carboxylates, oxalates or nitrates.
  • Both a and b and c are integers, the values for a, b and c being chosen so that the electroneutrality of the metal cyanide salt is given; a is preferably 1, 2, 3 or 4; b is preferably 4, 5 or 6; c preferably has the value 0.
  • suitable water-soluble metal cyanide salts are potassium hexacyanocobaltate (III), potassium hexacyanoferrate (II) 5 potassium hexacyanoferrate (III), calcium hexacyanocobaltate (III) and lithium hexacyanocobalate (III).
  • Preferred double metal cyanide compounds a) which are contained in the catalysts according to the invention are compounds of the general formula (III)
  • M is as defined in formula (I) and M 'as defined in formula (LT), and x, x', y and z are integers and are chosen such that the electron neutrality of the double metal cyanide compound is given.
  • M ' Co (III), Fe ( ⁇ i) 5 Cr (III) or IxQlT).
  • Suitable double metal cyanide compounds a) are zinc hexacyanocobalate (III), zinc hexacyanoiridate (III), zinc hexacyanoferrate (III) and cobalt (II) hexacyano cobaltate (III). Further examples of suitable double metal cyanide compounds are see for example US-A 5 158 922. Ziric hexacyanocobaltate (III) is particularly preferably used.
  • organic complex ligands b) contained in the DMC catalysts according to the invention are known in principle and are described in detail in the prior art (for example in US Pat. No. 5,158,922, US Pat. No. 3,404,109, US Pat. No. 3,829,505, US) -A 3 941 849, EP-A 700 949, EP-A 761. 708, JP-A 4 145 123, US-A 5 470 813, EP-A 743 093 and WO 97/40086).
  • Preferred organic complex ligands are water-soluble, organic compounds with heteroatoms, such as oxygen, nitrogen, phosphorus or sulfur, which with the double metal cyanide compound a)
  • Suitable organic complex ligands are e.g. Alcohols, aldehydes, ketones, ethers, esters, amides, ureas, nitriles, sulfides and their mixtures.
  • Preferred organic complex ligands are water-soluble aliphatic alcohols, such as ethanol, isopropanol, n-butanol, iso-butanol, sec. -Butanol and tert-butanol. Tert-butanol is particularly preferred.
  • Suitable cyclic polyols c) have at least two hydroxyl groups per molecule. They preferably have 2 to 4 OH groups per molecule, the number ratio of carbon atoms and OH groups in the molecule preferably not being greater than 4.
  • the polyols can have aromatic or aliphatic ring structures; cycloaliphatic polyols are preferably used.
  • the polyols preferably have 6 to 20 carbon atoms, the number of carbon atoms in the ring is preferably at least 8. Examples of cyclic polyol compounds preferably used are 1,2-cyclooctanediol and 1,5-cyclooctanediol.
  • the DMC catalysts according to the invention contain the double metal cyanide compounds a) in amounts of 20 to 90% by weight, preferably 25 to 80% by weight, based on the amount of the finished catalyst, and the organic complex ligands b) in amounts from 0.5 to 30, preferably 1 to 25 wt .-%, based on the amount of the finished catalyst.
  • the DMC catalysts according to the invention usually contain Usually 1 to 80% by weight, preferably 1 to 40% by weight, based on the amount of the finished catalyst, of at least one cyclic polyol c).
  • the analysis of the catalyst composition is usually carried out by means of elemental analysis, thermogravimetry or extractive removal of the proportion of the ionic
  • the catalysts according to the invention can be crystalline, partially crystalline or amorphous.
  • the crystallinity is usually analyzed by powder X-ray diffractometry.
  • the DMC catalysts according to the invention are usually prepared in aqueous solution by reacting ⁇ ) metal salts, in particular of the formula
  • aqueous solutions of the metal salt e.g.
  • Zinc chloride used in a stoichiometric excess (at least 50 mol% based on the metal cyanide salt)) and the metal cyanide salt (for example potassium hexacyanocobaltate) are reacted in the presence of the organic complex ligand b) (for example tert-butanol), a suspension being formed which contains the double metal cyanide compound a) (eg zinc hexacyanocobaltate), water d), excess metal salt e), and the organic complex ligand b).
  • the metal cyanide salt for example potassium hexacyanocobaltate
  • the organic complex ligand b) can be present in the aqueous solution of the metal salt and / or the metal cyanide salt, or it is added directly to the suspension obtained after precipitation of the double metal cyanide compound a).
  • the organic complex ligand is usually used in excess. It has proven advantageous to mix the aqueous solutions and the organic complex ligand b) with vigorous stirring.
  • the suspension formed is then usually treated with component c).
  • Component c) is preferably used in a mixture with water and organic complex ligand b).
  • the catalyst is then isolated from the suspension by known techniques, such as centrifugation or filtration.
  • the isolated catalyst is then washed with an aqueous solution of the organic complex ligand b) (e.g. by resuspending and then isolating again by filtration or centrifugation).
  • an aqueous solution of the organic complex ligand b) e.g. by resuspending and then isolating again by filtration or centrifugation.
  • water-soluble by-products such as potassium chloride can be removed from the catalyst according to the invention.
  • the proportion of the organic complex ligand b) is preferably in the aqueous
  • the first washing process can be repeated, for example.
  • non-aqueous solutions for example a mixture of organic complex ligands and the cyclic polyols c) used as component ⁇ ).
  • the washed catalyst is then dried, if appropriate after pulverization, at temperatures of generally 20-100 ° C. and at pressures generally from 0.1 mbar to normal pressure (1013 mbar).
  • the present invention furthermore relates to the use of the DMC catalysts according to the invention in a process for the preparation of polyether polyols by polyaddition of alkylene oxides onto starter compounds having active hydrogen atoms.
  • Preferred alkylene oxides are ethylene oxide, propylene oxide, butylene oxide and mixtures thereof.
  • the structure of the polyether chains by alkoxylation can e.g. be carried out only with a monomeric epoxide or also statistically or in blocks with 2 or 3 different monomeric epoxides. More details can be found in "Ullmann's Encyclopedia of Industrial Chemistry", Volume A21, 1992, p. 670f.
  • starter compounds having active hydrogen atoms compounds with (number average) molecular weights of 18 to 2,000 and 1 to 8 hydroxyl groups are preferably used.
  • Examples include: ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,4-butanediol, hexamethylene glycol, bisphenol A, trimethylolpropane, glycerol, pentaerythritol, sorbitol, cane sugar, degraded starch or water.
  • starter compounds containing active hydrogen atoms are used, which e.g. were prepared by conventional alkali catalysis from the abovementioned low molecular weight starters and are oligomeric alkoxylation products with (number average) molecular weights of 200 to 2,000.
  • Alkylene oxides are carried out on starter compounds having active hydrogen atoms generally at temperatures from 20 to 200 ° C, preferably in the range from 40 to 180 ° C, particularly preferably at temperatures from 50 to 150 ° C.
  • the reaction can be carried out at total pressures of 0.0001 to 20 bar.
  • the polyaddition can be carried out in bulk or in an inert, organic solvent, such as toluene and / or THF.
  • the amount of solvent is usually 10 to 30% by weight, based on the amount of the polyether polyol to be produced.
  • the catalyst concentration is chosen so that the polyaddition reaction can be well mastered under the given reaction conditions.
  • Catalyst concentration is generally in the range from 0.0005% by weight to 1% by weight, preferably in the range from 0.001% by weight to 0.1% by weight, particularly preferably in the range from 0.001 to 0.0025% by weight .-%, based on the amount of polyether polyol to be produced.
  • the (number average) molecular weights of the polyether polyols produced by the process according to the invention are in the range from 500 to 100,000 g / mol, preferably in the range from 1,000 to 50,000 g / mol, particularly preferably in the range from 2,000 to 20,000 g / mol.
  • the polyaddition can be continuous or discontinuous, e.g. be carried out in a batch or semi-batch process.
  • the catalysts according to the invention can be used in very low concentrations (25 ppm and less, based on the amount of the polyether polyol to be produced). If the polyether polyols prepared in the presence of the catalysts according to the invention are used for the production of polyurethanes (Kunststoff Handbuch, Vol. 7, Polyurethane, 3rd edition 1993, pp. 25-32 and 57-67), the catalyst can be removed from the polyether polyol are without adversely affecting the product qualities of the polyurethane obtained. Examples
  • a maximum of 50 g of propylene oxide were metered in at a pressure of 2.5 bar within 30 minutes. After 30 min the reaction mixture was cooled to RT and freed from propylene oxide by flushing with argon.
  • the product was characterized by a molecular weight distribution determined by GPC (weight average).

Abstract

The invention relates to novel double metal cyanide (DMC) catalysts for the production of polyetherpolyols through polyaddition of alkylene oxides to starter compounds, comprising active hydrogen atoms, whereby the catalyst comprises a) double metal cyanide compounds, b) organic complex ligands and c) cyclic polyols. Said catalysts have markedly increased activity in the production of polyetherpolyols.

Description

Doppelmetallcyanid-Katalysatoren für die Herstellung von PolyetherpolyolenDouble metal cyanide catalysts for the production of polyether polyols
Die Erfindung betrifft neue Doppelmetallcyanid (DMC)-Katalysatoren für die Her- Stellung von Polyetherpolyolen durch Polyaddition von Alkylenoxiden an aktiveThe invention relates to new double metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides to active ones
Wasserstoffatome aufweisende Starterverbindungen.Starter compounds containing hydrogen atoms.
Doppelmetallcyanid (DMC)-Katalysatoren für die Polyaddition von Alkylenoxiden an aktive Wasserstoffatome aufweisende Starterverbindungen sind bekannt (siehe z.B. US-A 3 404 109, US-A 3 829 505, US-A 3 941 849 und US-A 5 158 922). DerDouble metal cyanide (DMC) catalysts for the polyaddition of alkylene oxides to starter compounds having active hydrogen atoms are known (see e.g. US-A 3 404 109, US-A 3 829 505, US-A 3 941 849 and US-A 5 158 922). The
Einsatz dieser DMC-Katalysatoren für die Herstellung von Polyetherpolyolen bewirkt insbesondere eine Reduzierung des Anteils an monofunktionellen Polyethern mit endständigen Doppelbindungen, sogenannten Monoolen, im Nergleich zu der konventionellen Herstellung von Polyetherpolyolen mittels Alkali-Katalysatoren, wie Alkalihydroxiden. Die so erhaltenen Polyetherpolyole können zu hochwertigen Polyurethanen (z.B. Elastomere, Schäume, Beschichtungen) verarbeitet werden. DMC- Katalysatoren werden gewöhnlich erhalten, indem man eine wässrige Lösung eines Metallsalzes mit der wässrigen Lösung eines Metallcyanidsalzes in Gegenwart eines organischen Komplexliganden, z.B. eines Ethers, umsetzt. In einer typischen Kataly- satorpräparation werden beispielsweise wässrige Lösungen von Zinkchlorid (imUse of these DMC catalysts for the production of polyether polyols results in particular in a reduction in the proportion of monofunctional polyethers with terminal double bonds, so-called monools, in comparison to the conventional production of polyether polyols using alkali catalysts, such as alkali metal hydroxides. The polyether polyols thus obtained can be processed into high-quality polyurethanes (e.g. elastomers, foams, coatings). DMC catalysts are usually obtained by combining an aqueous solution of a metal salt with the aqueous solution of a metal cyanide salt in the presence of an organic complex ligand, e.g. of an ether. In a typical catalyst preparation, for example, aqueous solutions of zinc chloride (in
Überschuß) und Kaliumhexacyanocobaltat gemischt und anschließend Dimethoxy- ethan (Glyme) zur gebildeten Suspension gegeben. Nach Filtration und Waschen des Katalysators mit wässriger Glyme-Lösung wird ein aktiver Katalysator der allgemeinen FormelExcess) and potassium hexacyanocobaltate mixed and then added dimethoxyethane (glyme) to the suspension formed. After filtration and washing of the catalyst with aqueous glyme solution, an active catalyst of the general formula
Zn3[Co(CN)6]2 x ZnCl2 yH2O z GlymeZn 3 [Co (CN) 6 ] 2 x ZnCl 2 yH 2 O z glyme
erhalten (siehe z.B. EP-A 700 949).received (see e.g. EP-A 700 949).
Aus JP-A 4 145 123, US-A 5 470 813, EP-A 700 949, EP-A 743 093, EP-A 761 708 und WO 97/40086 sind DMC-Katalysatoren bekannt, die durch Einsatz von tert- Butanol als organischem Komplexliganden (allein oder in Kombination mit einem Polyether (EP-A 700 949, EP-A 761 708, WO 97/40086)) den Anteil an monofunktionellen Polyethem mit endständigen Doppelbindungen bei der Herstellung von Polyetherpolyolen weiter reduzieren. Darüber hinaus wird durch den Einsatz dieser DMC-Katalysatoren die Induktionszeit bei der Polyadditionsreaktion der Alkylen- oxide mit entsprechenden Starterverbindungen reduziert und die Katalysatoraktivität erhöht.DMC catalysts are known from JP-A 4 145 123, US-A 5 470 813, EP-A 700 949, EP-A 743 093, EP-A 761 708 and WO 97/40086. Butanol as an organic complex ligand (alone or in combination with a polyether (EP-A 700 949, EP-A 761 708, WO 97/40086)) further reduce the proportion of monofunctional polyethers with terminal double bonds in the production of polyether polyols. In addition, the use of these DMC catalysts reduces the induction time in the polyaddition reaction of the alkylene oxides with appropriate starter compounds and increases the catalyst activity.
Es wurde jetzt gefunden, dass DMC-Katalysatoren, die ein cyclisches Polyol als Komplexliganden enthalten, bei der Polyetherpolyol-Herstellung stark erhöhteIt has now been found that DMC catalysts containing a cyclic polyol as a complex ligand greatly increased in polyether polyol production
Aktivität besitzen.Possess activity.
Gegenstand der vorliegenden Erfindung ist daher ein Doppelmetallcyanid (DMC)- Katalysator, enthaltendThe present invention therefore relates to a double metal cyanide (DMC) catalyst comprising
a) mindestens eine Doppelmetallcyanid-Nerbindung,a) at least one double metal cyanide bond,
b) mindestens einen organischen Komplexliganden, der kein cyclisches Polyol ist, undb) at least one organic complex ligand that is not a cyclic polyol, and
c) mindestens ein cyclisches Polyol.c) at least one cyclic polyol.
In dem erfmdungsgemäßen Katalysator können gegebenenfalls d) Wasser, vorzugsweise 1 bis 10 Gew.-% und/oder e) eines oder mehrere wasserlösliche Metallsalze, vorzugsweise 5 bis 25 Gew.-%, der Formel (I) M(X)n aus der Herstellung der Dop- pelmetallcyanidverbindungen a) enthalten sein. In Formel (I) wird M ausgewählt aus den Metallen Zn (11), Fe (II), Νi (II), Mn (II), Co (II), Sn (II), Pb (11), Fe (III), Mo (IV), Mo (VT), AI (III), N (N), N (IN), Sr (II), W (IN), W (NI), Cu (II) und Cr (HI). Besonders bevorzugt sind Zn (LT), Fe (II), Co (II) und Νi (IT). Die Anionen X sind gleich oder verschieden, vorzugsweise gleich, und bevorzugt ausgewählt aus derIn the catalyst according to the invention, d) water, preferably 1 to 10% by weight and / or e) one or more water-soluble metal salts, preferably 5 to 25% by weight, of the formula (I) M (X) n from the Preparation of the double metal cyanide compounds a) may be included. In formula (I), M is selected from the metals Zn (11), Fe (II), Νi (II), Mn (II), Co (II), Sn (II), Pb (11), Fe (III) , Mo (IV), Mo (VT), AI (III), N (N), N (IN), Sr (II), W (IN), W (NI), Cu (II) and Cr (HI) , Zn (LT), Fe (II), Co (II) and Νi (IT) are particularly preferred. The anions X are the same or different, preferably the same, and preferably selected from the
Gruppe der Halogenide, Hydroxide, Sulfate, Carbonate, Cyanate, Thiocyanate, Isocyanate, Isothiocyanate, Carboxylate, Oxalate oder Nitrate. Der Wert für n ist 1, 2 oder 3.Group of halides, hydroxides, sulfates, carbonates, cyanates, thiocyanates, Isocyanates, isothiocyanates, carboxylates, oxalates or nitrates. The value for n is 1, 2, or 3.
Die in den erfmdungsgemäßen Katalysatoren enthaltenen Doppelmetallcyanid- Ver- bindungen a) sind die Reaktionsprodukte wasserlöslicher Metallsalze und wasserlöslicher Metallcyanidsalze.The double metal cyanide compounds a) contained in the catalysts according to the invention are the reaction products of water-soluble metal salts and water-soluble metal cyanide salts.
Zur Herstellung von Doppelmetallcyanid-Nerbindungen a) geeignete wasserlösliche Metallsalze besitzen bevorzugt die allgemeine Formel (I) M(X)n, wobei M ausge- wählt wird aus den Metallen Zn (II), Fe (II), Νi (LT), Mn (II), Co (II), Sn (II), Pb (LT),Water-soluble metal salts suitable for the preparation of double metal cyanide compounds a) preferably have the general formula (I) M (X) n , where M is selected from the metals Zn (II), Fe (II), Νi (LT), Mn (II), Co (II), Sn (II), Pb (LT),
Fe (ET), Mo (IV), Mo (VI), AI (III), V (V), V (IN), Sr (II), W (IN), W (VI), Cu (II) und Cr (III). Besonders bevorzugt sind Zn (II), Fe (II), Co (LT) und Νi (TT). Die Anionen X sind gleich oder verschieden, vorzugsweise gleich und werden bevorzugt ausgewählt aus der Gruppe der Halogenide, Hydroxide, Sulfate, Carbonate, Cyanate, Thiocyanate, Isocyanate, Isothiocyanate, Carboxylate, Oxalate oder Nitrate. DerFe (ET), Mo (IV), Mo (VI), AI (III), V (V), V (IN), Sr (II), W (IN), W (VI), Cu (II) and Cr (III). Zn (II), Fe (II), Co (LT) and Νi (TT) are particularly preferred. The anions X are the same or different, preferably the same and are preferably selected from the group of halides, hydroxides, sulfates, carbonates, cyanates, thiocyanates, isocyanates, isothiocyanates, carboxylates, oxalates or nitrates. The
Wert für n ist 1, 2 oder 3.The value for n is 1, 2 or 3.
Beispiele geeigneter wasserlöslicher Metallsalze sind Zinkchlorid, Zinkbromid, Zinkacetat, Zinkacetylacetonat, Zinkbenzoat, Zinknitrat, Eisen(II)sulfat, Eisen(II)- bromid, Eisen(II)chlorid, Cobalt(II)chlorid, Cobalt(π)thiocyanat, Nickel(II)chlorid und Nickel(II)nitrat. Es können auch Mischungen verschiedener wasserlöslicher Metallsalze eingesetzt werden.Examples of suitable water-soluble metal salts are zinc chloride, zinc bromide, zinc acetate, zinc acetylacetonate, zinc benzoate, zinc nitrate, iron (II) sulfate, iron (II) bromide, iron (II) chloride, cobalt (II) chloride, cobalt (π) thiocyanate, nickel ( II) chloride and nickel (II) nitrate. Mixtures of various water-soluble metal salts can also be used.
Zur Herstellung von Doppelmetallcyanid-Verbindungen a) geeignete wasserlösliche Metallcyanidsalze besitzen bevorzugt die allgemeine Formel (II) (Y)a M'(CN)b (A)c, wobei M' ausgewählt wird aus den Metallen Fe(II), Fe(III), Co(II), Co(III), Cr(II), Cr(III), Mn(π), Mnttli), Ir(III), Ni(II), Rh(III), Ru(LI), V(IN) und N(V). Besonders bevorzugt wird M' ausgewählt aus den Metallen Co(II), Co(III), Fe(II), Fe(IÜ), Cr(ILT), Ir(III) und Νi(II). Das wasserlösliche Metallcyanidsalz kann eines oder meh- rere dieser Metalle enthalten. Die Kationen Y sind gleich oder verschieden, vorzugsweise gleich, und werden ausgewählt aus der Alkalimetallionen und Erd- alkalimetallionen umfassenden Gruppe. Die Anionen A sind gleich oder verschieden, vorzugsweise gleich, und werden ausgewählt aus der Gruppe der Halogenide, Hydroxide, Sulfate, Carbonate, Cyanate, Thiocyanate, Isocyanate, Isothiocyanate, Carboxylate, Oxalate oder Nitrate. Sowohl a als auch b und c sind ganzzahlig, wobei die Werte für a, b und c so gewählt sind, dass die Elektroneutralität des Metall- cyanidsalzes gegeben ist; a ist vorzugsweise 1, 2, 3 oder 4; b ist vorzugsweise 4, 5 oder 6; c besitzt bevorzugt den Wert 0. Beispiele geeigneter wasserlöslicher Metallcyanidsalze sind Kaliumhexacyanocobaltat(III), Kaliumhexacyanoferrat(II)5 Kalium- hexacyanoferrat(III), Calciumhexacyanocobaltat(III) und Lithiumhexacyanocobal- tat(III).Water-soluble metal cyanide salts suitable for the preparation of double metal cyanide compounds a) preferably have the general formula (II) (Y) a M '(CN) b (A) c , where M' is selected from the metals Fe (II), Fe (III ), Co (II), Co (III), Cr (II), Cr (III), Mn (π), Mnttli), Ir (III), Ni (II), Rh (III), Ru (LI), V (IN) and N (V). M 'is particularly preferably selected from the metals Co (II), Co (III), Fe (II), Fe (IÜ), Cr (ILT), Ir (III) and Νi (II). The water-soluble metal cyanide salt can contain one or more of these metals. The cations Y are the same or different, preferably the same, and are selected from the alkali metal ions and earth group comprising alkali metal ions. The anions A are the same or different, preferably the same, and are selected from the group of halides, hydroxides, sulfates, carbonates, cyanates, thiocyanates, isocyanates, isothiocyanates, carboxylates, oxalates or nitrates. Both a and b and c are integers, the values for a, b and c being chosen so that the electroneutrality of the metal cyanide salt is given; a is preferably 1, 2, 3 or 4; b is preferably 4, 5 or 6; c preferably has the value 0. Examples of suitable water-soluble metal cyanide salts are potassium hexacyanocobaltate (III), potassium hexacyanoferrate (II) 5 potassium hexacyanoferrate (III), calcium hexacyanocobaltate (III) and lithium hexacyanocobalate (III).
Bevorzugte Doppelmetallcyanid- Verbindungen a), die in den erfindungsgemäßen Katalysatoren enthalten sind, sind Verbindungen der allgemeinen Formel (III)Preferred double metal cyanide compounds a) which are contained in the catalysts according to the invention are compounds of the general formula (III)
Mx[M'x,(CN)y]z ,M x [M ' x , (CN) y ] z ,
worin M wie in Formel (I) und M' wie in Formel (LT) definiert ist, und x, x', y und z ganzzahlig und so gewählt sind, dass die Elektronenneutralität der Dop- pelmetallcyanidverbindung gegeben ist.where M is as defined in formula (I) and M 'as defined in formula (LT), and x, x', y and z are integers and are chosen such that the electron neutrality of the double metal cyanide compound is given.
Vorzugsweise istPreferably
x = 3, x' = 1, y = 6 und z = 2, M = Zn(II), Fe(II), Co(II) oder Ni(II) undx = 3, x '= 1, y = 6 and z = 2, M = Zn (II), Fe (II), Co (II) or Ni (II) and
M' = Co(III), Fe(πi)5 Cr(III) oder IxQlT).M '= Co (III), Fe (πi) 5 Cr (III) or IxQlT).
Beispiele geeigneter Doppelmetallcyanidverbindungen a) sind Zinkhexacyanocobal- tat(III), Zinkhexacyanoiridat(III), Zinkhexacyanoferrat(III) und Cobalt(II)hexacyano- cobaltat(III). Weitere Beispiele geeigneter Doppelmetallcyanid- Verbindungen sind z.B. US-A 5 158 922 zu entnehmen. Besonders bevorzugt verwendet wird Zirikhexa- cyanocobaltat(III).Examples of suitable double metal cyanide compounds a) are zinc hexacyanocobalate (III), zinc hexacyanoiridate (III), zinc hexacyanoferrate (III) and cobalt (II) hexacyano cobaltate (III). Further examples of suitable double metal cyanide compounds are see for example US-A 5 158 922. Ziric hexacyanocobaltate (III) is particularly preferably used.
Die in den erfindungsgemäßen DMC-Katalysatoren enthaltenen organischen Kom- plexliganden b) sind im Prinzip bekannt und ausführlich im Stand der Technik beschrieben (beispielsweise in US-A 5 158 922, US-A 3 404 109, US-A 3 829 505, US-A 3 941 849, EP-A 700 949, EP-A 761. 708, JP-A 4 145 123, US-A 5 470 813, EP-A 743 093 und WO 97/40086). Bevorzugte organische Komplexliganden sind wasserlösliche, organische Verbindungen mit Heteroatomen, wie Sauerstoff, Stickstoff, Phosphor oder Schwefel, die mit der Doppelmetallcyanid- Verbindung a)The organic complex ligands b) contained in the DMC catalysts according to the invention are known in principle and are described in detail in the prior art (for example in US Pat. No. 5,158,922, US Pat. No. 3,404,109, US Pat. No. 3,829,505, US) -A 3 941 849, EP-A 700 949, EP-A 761. 708, JP-A 4 145 123, US-A 5 470 813, EP-A 743 093 and WO 97/40086). Preferred organic complex ligands are water-soluble, organic compounds with heteroatoms, such as oxygen, nitrogen, phosphorus or sulfur, which with the double metal cyanide compound a)
Komplexe bilden können. Geeignete organische Komplexliganden sind z.B. Alkohole, Aldehyde, Ketone, Ether, Ester, Amide, Harnstoffe, Nitrile, Sulfide und deren Mischungen. Bevorzugte organische Komplexliganden sind wasserlösliche ali- phatische Alkohole, wie Ethanol, Isopropanol, n-Butanol, iso-Butanol, sek. -Butanol und tert.-Butanol. Besonders bevorzugt ist tert.-Butanol.Can form complexes. Suitable organic complex ligands are e.g. Alcohols, aldehydes, ketones, ethers, esters, amides, ureas, nitriles, sulfides and their mixtures. Preferred organic complex ligands are water-soluble aliphatic alcohols, such as ethanol, isopropanol, n-butanol, iso-butanol, sec. -Butanol and tert-butanol. Tert-butanol is particularly preferred.
Geeignete cyclische Polyole c) weisen mindestens zwei Hydroxylgruppen pro Molekül auf. Bevorzugt besitzen sie 2 bis 4 OH-Gruppen pro Molekül, wobei das Zahlenverhältnis von Kohlenstoff-Atomen und OH-Gruppen im Molekül bevorzugt niccht größer als 4 ist. Die Polyole können aromatische oder aliphatische Ringstrukturen aufweisen; bevorzugt werden cycloaliphatische Polyole eingesetzt. Die Polyole weisen bevorzugt 6 bis 20 Kohlenstoffatome auf, bevorzugt beträgt die Anzahl der Kohlenstoffatome im Ring mindestens 8. Beispiele bevorzugt eingesetzter cyclischer Polyolverbindungen sind 1,2-Cyclooctandiol und 1,5-Cyclooctandiol.Suitable cyclic polyols c) have at least two hydroxyl groups per molecule. They preferably have 2 to 4 OH groups per molecule, the number ratio of carbon atoms and OH groups in the molecule preferably not being greater than 4. The polyols can have aromatic or aliphatic ring structures; cycloaliphatic polyols are preferably used. The polyols preferably have 6 to 20 carbon atoms, the number of carbon atoms in the ring is preferably at least 8. Examples of cyclic polyol compounds preferably used are 1,2-cyclooctanediol and 1,5-cyclooctanediol.
Die erfindungsgemäßen DMC-Katalysatoren enthalten die Doppelmetallcyanid-Ver- bindungen a) in Mengen von 20 bis 90 Gew.-%, bevorzugt 25 bis 80 Gew.-%, bezogen auf die Menge des fertigen Katalysators, und die organischen Komplexliganden b) in Mengen von 0,5 bis 30, bevorzugt 1 bis 25 Gew.-%, bezogen auf die Menge des fertigen Katalysators. Die erfindungsgemäßen DMC-Katalysatoren enthalten übli- cherweise 1 bis 80 Gew.-%, bevorzugt 1 bis 40 Gew.-%, bezogen auf die Menge des fertigen Katalysators, mindestens eines cyclischen Polyols c).The DMC catalysts according to the invention contain the double metal cyanide compounds a) in amounts of 20 to 90% by weight, preferably 25 to 80% by weight, based on the amount of the finished catalyst, and the organic complex ligands b) in amounts from 0.5 to 30, preferably 1 to 25 wt .-%, based on the amount of the finished catalyst. The DMC catalysts according to the invention usually contain Usually 1 to 80% by weight, preferably 1 to 40% by weight, based on the amount of the finished catalyst, of at least one cyclic polyol c).
Die Analyse der Katalysatorzusammensetzung erfolgt üblicherweise mittels Elemen- taranalyse, Thermogravimetrie oder extraktiver Entfernung des Anteils der ionischenThe analysis of the catalyst composition is usually carried out by means of elemental analysis, thermogravimetry or extractive removal of the proportion of the ionic
Oberflächen- bzw. grenzflächenaktiven Verbindung mit anschliessender gravimetri- scher Bestimmung.Surface or interface active connection with subsequent gravimetric determination.
Die erfmdungsgemäßen Katalysatoren können kristallin, teilkristallin oder amorph sein. Die Analyse der Kristallinität erfolgt üblicherweise durch Pulverröntgen- diffraktometrie.The catalysts according to the invention can be crystalline, partially crystalline or amorphous. The crystallinity is usually analyzed by powder X-ray diffractometry.
Bevorzugt sind erfindungsgemäße Katalysatoren enthaltendCatalysts according to the invention are preferred
a) Zinkhexacyanocobaltat (III), b) tert.-Butanol und c) ein cyclisches Polyol.a) zinc hexacyanocobaltate (III), b) tert-butanol and c) a cyclic polyol.
Die Herstellung der erfindungsgemäßen DMC-Katalysatoren erfolgt üblicherweise in wässriger Lösung durch Umsetzung von α) Metallsalzen, insbesondere der FormelThe DMC catalysts according to the invention are usually prepared in aqueous solution by reacting α) metal salts, in particular of the formula
(I) mit Metallcyanidsalzen insbesondere der Formel (II), ß) organischen Komplexliganden b), die keine cyclischen Polyole sind, und γ) mindestens einem cyclischen Polyol c).(I) with metal cyanide salts, in particular of the formula (II), β) organic complex ligands b) which are not cyclic polyols, and γ) at least one cyclic polyol c).
Bevorzugt werden dabei zunächst die wässrigen Lösungen des Metallsalzes (z.B.The aqueous solutions of the metal salt (e.g.
Zinkchlorid, eingesetzt im stöchiometrischen Überschuß (mindestens 50 Mol-% bezogen auf das Metallcyanidsalz)) und des Metallcyanidsalzes (z.B. Kaliumhexa- cyanocobaltat) in Gegenwart des organischen Komplexliganden b) (z.B. tert.-Butanol) umgesetzt, wobei sich eine Suspension bildet, die die Doppelmetallcyanid- Ver- bindung a) (z.B. Zinkhexacyanocobaltat), Wasser d), überschüssiges Metallsalz e), und den organischen Komplexliganden b) enthält. Der organische Komplexligand b) kann dabei in der wässngen Lösung des Metallsalzes und/oder des Metallcyanidsalzes vorhanden sein, oder er wird der nach Ausfällung der Doppelmetallcyanid-Verbindung a) erhaltenen Suspension unmittelbar zugegeben. Gewöhnlich wird der organische Komplexligand im Überschuß eingesetzt. Es hat sich als vorteilhaft erwiesen, die wässrigen Lösungen und den organischen Komplexliganden b) unter starkem Rühren zu vermischen. Die gebildete Suspension wird üblicherweise anschließend mit Komponente c) behandelt. Die Komponente c) wird dabei bevorzugt in einer Mischung mit Wasser und organischem Komplexliganden b) eingesetzt.Zinc chloride, used in a stoichiometric excess (at least 50 mol% based on the metal cyanide salt)) and the metal cyanide salt (for example potassium hexacyanocobaltate) are reacted in the presence of the organic complex ligand b) (for example tert-butanol), a suspension being formed which contains the double metal cyanide compound a) (eg zinc hexacyanocobaltate), water d), excess metal salt e), and the organic complex ligand b). The organic complex ligand b) can be present in the aqueous solution of the metal salt and / or the metal cyanide salt, or it is added directly to the suspension obtained after precipitation of the double metal cyanide compound a). The organic complex ligand is usually used in excess. It has proven advantageous to mix the aqueous solutions and the organic complex ligand b) with vigorous stirring. The suspension formed is then usually treated with component c). Component c) is preferably used in a mixture with water and organic complex ligand b).
Anschließend erfolgt die Isolierung des Katalysators aus der Suspension durch bekannte Techniken, wie Zentrifugation oder Filtration. In einer bevorzugten Ausführungsvariante wird der isolierte Katalysator anschließend mit einer wässrigen Lösung des organischen Komplexliganden b) gewaschen (z.B. durch Resuspendieren und anschließende erneute Isolierung durch Filtration oder Zentrifugation). Auf diese Weise können zum Beispiel wasserlösliche Nebenprodukte, wie Kaliumchlorid, aus dem erfindungsgemäßen Katalysator entfernt werden.The catalyst is then isolated from the suspension by known techniques, such as centrifugation or filtration. In a preferred embodiment, the isolated catalyst is then washed with an aqueous solution of the organic complex ligand b) (e.g. by resuspending and then isolating again by filtration or centrifugation). In this way, for example, water-soluble by-products such as potassium chloride can be removed from the catalyst according to the invention.
Bevorzugt beträgt der Anteil des organischen Komplexliganden b) in der wässrigenThe proportion of the organic complex ligand b) is preferably in the aqueous
Waschlösung 20 bis 80 Gew.-%, bezogen auf die Gesamtlösung. Weiterhin ist es vorteilhaft, der wässrigen Waschlösung eine kleine Menge der als Komponente γ) eingesetzten cyclischen Polyole c) zuzufügen, bevorzugt 0,5 bis 5 Gew.-%, bezogen auf die Gesamtlösung.Washing solution 20 to 80 wt .-%, based on the total solution. It is also advantageous to add a small amount of the cyclic polyols c) used as component γ) to the aqueous washing solution, preferably 0.5 to 5% by weight, based on the total solution.
Außerdem ist es vorteilhaft, den Katalysator mehr als einmal zu waschen. Hierzu kann z.B. der erste Waschvorgang wiederholt werden. Bevorzugt ist es aber, für weitere Waschvorgänge nichtwässrige Lösungen zu verwenden, z.B. eine Mischung aus organischem Komplexliganden und der als Komponente γ) eingesetzten cyclischen Polyole c) . Der gewaschene Katalysator wird anschließend, gegebenenfalls nach Pulverisierung, bei Temperaturen von im allgemeinen 20 - 100°C und bei Drücken von im allgemeinen 0,1 mbar bis Normaldruck (1013 mbar) getrocknet.It is also advantageous to wash the catalyst more than once. For this purpose, the first washing process can be repeated, for example. However, it is preferred to use non-aqueous solutions for further washing processes, for example a mixture of organic complex ligands and the cyclic polyols c) used as component γ). The washed catalyst is then dried, if appropriate after pulverization, at temperatures of generally 20-100 ° C. and at pressures generally from 0.1 mbar to normal pressure (1013 mbar).
Ein weiterer Gegenstand der vorliegenden Erfindung ist die Verwendung der erfindungsgemäßen DMC-Katalysatoren in einem Verfahren zur Herstellung von Polyetherpolyolen durch Polyaddition von Alkylenoxiden an aktive Wasserstoffatome aufweisende Starterverbindungen.The present invention furthermore relates to the use of the DMC catalysts according to the invention in a process for the preparation of polyether polyols by polyaddition of alkylene oxides onto starter compounds having active hydrogen atoms.
Als Alkylenoxide kommen bevorzugt Ethylenoxid, Propylenoxid, Butylenoxid sowie deren Mischungen zum Einsatz. Der Aufbau der Polyetherketten durch Alkoxylie- rung kann z.B. nur mit einem monomeren Epoxid durchgeführt werden oder auch statistisch oder blockweise mit 2 oder 3 unterschiedlichen monomeren Epoxiden erfolgen. Näheres ist "Ullmanns Encyclopädie der industriellen Chemie", Band A21, 1992, S. 670f zu entnehmen.Preferred alkylene oxides are ethylene oxide, propylene oxide, butylene oxide and mixtures thereof. The structure of the polyether chains by alkoxylation can e.g. be carried out only with a monomeric epoxide or also statistically or in blocks with 2 or 3 different monomeric epoxides. More details can be found in "Ullmann's Encyclopedia of Industrial Chemistry", Volume A21, 1992, p. 670f.
Als aktive Wasserstoffatome aufweisende Starterverbindungen werden vorzugsweise Verbindungen mit (zahlenmittleren) Molekulargewichten von 18 bis 2.000 und 1 bis 8 Hydroxylgruppen eingesetzt. Beispielsweise werden genannt: Ethylenglykol, Diethylenglykol, Triethylenglykol, 1,2-Propylenglykol, 1,4-Butandiol, Hexamethy- lenglykol, Bisphenol A, Trimethylolpropan, Glycerin, Pentaerythrit, Sorbit, Rohrzucker, abgebaute Stärke oder Wasser.As starter compounds having active hydrogen atoms, compounds with (number average) molecular weights of 18 to 2,000 and 1 to 8 hydroxyl groups are preferably used. Examples include: ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,4-butanediol, hexamethylene glycol, bisphenol A, trimethylolpropane, glycerol, pentaerythritol, sorbitol, cane sugar, degraded starch or water.
Vorteilhafterweise werden solche aktive Wasserstoffatome aufweisende Starterver- bindungen eingesetzt, die z.B. durch konventionelle Alkalikatalyse aus den zuvor genannten niedermolekularen Startern hergestellt wurden und oligomere Alkoxylie- rungsprodukte darstellen mit (zahlenmittleren) Molekulargewichten von 200 bis 2.000.Advantageously, starter compounds containing active hydrogen atoms are used, which e.g. were prepared by conventional alkali catalysis from the abovementioned low molecular weight starters and are oligomeric alkoxylation products with (number average) molecular weights of 200 to 2,000.
Die durch die erfindungsgemäßen Katalysatoren katalysierte Polyaddition vonThe polyaddition catalyzed by the catalysts of the invention
Alkylenoxiden an aktive Wasserstoffatome aufweisende Starterverbindungen erfolgt im allgemeinen bei Temperaturen von 20 bis 200°C, bevorzugt im Bereich von 40 bis 180°C, besonders bevorzugt bei Temperaturen von 50 bis 150°C. Die Reaktion kann bei Gesamtdrücken von 0,0001 bis 20 bar durchgeführt werden. Die Polyaddition kann in Substanz oder einem inerten, organischen Lösungsmittel, wie Toluol und/oder THF, durchgeführt werden. Die Menge an Lösungsmittel beträgt üblicherweise 10 bis 30 Gew.-%, bezogen auf die Menge des herzustellenden Polyetherpolyols.Alkylene oxides are carried out on starter compounds having active hydrogen atoms generally at temperatures from 20 to 200 ° C, preferably in the range from 40 to 180 ° C, particularly preferably at temperatures from 50 to 150 ° C. The reaction can be carried out at total pressures of 0.0001 to 20 bar. The polyaddition can be carried out in bulk or in an inert, organic solvent, such as toluene and / or THF. The amount of solvent is usually 10 to 30% by weight, based on the amount of the polyether polyol to be produced.
Die Katalysatorkonzentration wird so gewählt, dass unter den gegebenen Reaktions- bedingungen eine gute Beherrschung der Polyadditionsreaktion möglich ist. DieThe catalyst concentration is chosen so that the polyaddition reaction can be well mastered under the given reaction conditions. The
Katalysatorkonzentration liegt im allgemeinen im Bereich von 0,0005 Gew.-% bis 1 Gew.-%, bevorzugt im Bereich von 0,001 Gew.-% bis 0,1 Gew.-%, besonders bevorzugt im Bereich von 0,001 bis 0,0025 Gew.-%, bezogen auf die Menge des herzustellenden Polyetherpolyols.Catalyst concentration is generally in the range from 0.0005% by weight to 1% by weight, preferably in the range from 0.001% by weight to 0.1% by weight, particularly preferably in the range from 0.001 to 0.0025% by weight .-%, based on the amount of polyether polyol to be produced.
Die (zahlenmittleren) Molekulargewichte der nach dem erfindungsgemäßen Verfahren hergestellten Polyetherpolyole liegen im Bereich von 500 bis 100.000 g/mol, bevorzugt im Bereich von 1.000 bis 50.000 g/mol, besonders bevorzugt im Bereich von 2.000 bis 20.000 g/mol.The (number average) molecular weights of the polyether polyols produced by the process according to the invention are in the range from 500 to 100,000 g / mol, preferably in the range from 1,000 to 50,000 g / mol, particularly preferably in the range from 2,000 to 20,000 g / mol.
Die Polyaddition kann kontinuierlich oder diskontinuierlich, z.B. in einem Batch- oder im Semibatchverfahren durchgeführt werden.The polyaddition can be continuous or discontinuous, e.g. be carried out in a batch or semi-batch process.
Die erfmdungsgemäßen Katalysatoren können wegen ihrer deutlich erhöhten Akti- vität in sehr niedrigen Konzentrationen eingesetzt werden (25 ppm und weniger, bezogen auf die Menge des herzustellenden Polyetherpolyols). Werden die in Gegenwart der erfindungsgemäßen Katalysatoren hergestellten Polyetherpolyole zur Herstellung von Polyurethanen verwendet (Kunststoffhandbuch, Bd. 7, Polyurethane, 3. Aufl. 1993, S. 25-32 und 57-67), kann auf eine Entfernung des Katalysators aus dem Polyetherpolyol verzichtet werden, ohne dass die Produktqualitäten des erhaltenen Polyurethans nachteilig beeinflußt werden. BeispieleBecause of their significantly increased activity, the catalysts according to the invention can be used in very low concentrations (25 ppm and less, based on the amount of the polyether polyol to be produced). If the polyether polyols prepared in the presence of the catalysts according to the invention are used for the production of polyurethanes (Kunststoff Handbuch, Vol. 7, Polyurethane, 3rd edition 1993, pp. 25-32 and 57-67), the catalyst can be removed from the polyether polyol are without adversely affecting the product qualities of the polyurethane obtained. Examples
Beispiel 1 Herstellung eines DMC-Katalysators mit 1,5-CyclooctandiolExample 1 Preparation of a DMC catalyst with 1,5-cyclooctanediol
Zu einer Mischung von 15 ml einer wässrigen 11,8 gew.-%igen Zinkchloridlösung,To a mixture of 15 ml of an aqueous 11.8% by weight zinc chloride solution,
13 ml tert.-Butanol und 0,4 g 1,5-Cyclooctandiol wurden unter starkem Rühren 9 ml einer wässrigen 7,4 gew.-%igen Kaliumhexacyanocobaltat-Lösung gegeben. Das gebildete Präzipitat wurde mit einer Mischung aus 10 ml tert.-Butanol und 30 ml Wasser gewaschen und abfiltriert. Der Filterrückstand wurde anschließend mit 20 ml tert.-Butanol versetzt und erneut filtriert. Nach Filtration wurde der Katalysator bei13 ml of tert-butanol and 0.4 g of 1,5-cyclooctanediol were added to 9 ml of an aqueous 7.4% by weight potassium hexacyanocobaltate solution with vigorous stirring. The precipitate formed was washed with a mixture of 10 ml of tert-butanol and 30 ml of water and filtered off. The filter residue was then mixed with 20 ml of tert-butanol and filtered again. After filtration, the catalyst became
50°C unter vermindertem Druck (10 mbar) bis zur Gewichtskonstanz getrocknet.50 ° C under reduced pressure (10 mbar) dried to constant weight.
Elementaranalyse, Thermogravimetrische Analyse und Extraktion: Cobalt = 10,7 Gew.-%, Zink = 26,1 Gew.-%, tert.-Butanol = 6,0 Gew.-%, 1,5-Cyclo- octandiol = 20,3 Gew.-%Elemental analysis, thermogravimetric analysis and extraction: cobalt = 10.7% by weight, zinc = 26.1% by weight, tert-butanol = 6.0% by weight, 1,5-cyclo-octanediol = 20, 3% by weight
Beispiel 2 Herstellung eines DMC-Katalysators mit 1,5-CyclooctandiolExample 2 Preparation of a DMC catalyst with 1,5-cyclooctanediol
Zu einer Mischung von 15 ml einer wässrigen 11,8 gew.-%igen Zinkchloridlösung, 13 ml tert.-Butanol, 6,5 ml einer wässrigen 4 gew.-%igen Nicotinsäure-Lösung undTo a mixture of 15 ml of an aqueous 11.8% by weight zinc chloride solution, 13 ml of tert-butanol, 6.5 ml of an aqueous 4% by weight nicotinic acid solution and
0,4 g 1,5-Cyclooctandiol wurden unter starkem Rühren 9 ml einer wässrigen 7,4 gew.-%igen Kaliumhexacyanocobaltat-Lösung gegeben. Das gebildete Präzipitat wurde mit einer Mischung aus 10 ml tert.-Butanol und 30 ml Wasser gewaschen und abfiltriert. Der Filterrückstand wurde anschließend mit 20 ml tert.-Butanol versetzt und erneut filtriert. Nach Filtration wurde der Katalysator bei 50°C unter vermindertem Druck (10 mbar) bis zur Gewichtskonstanz getrocknet.0.4 g of 1,5-cyclooctanediol was added to 9 ml of an aqueous 7.4% by weight potassium hexacyanocobaltate solution with vigorous stirring. The precipitate formed was washed with a mixture of 10 ml of tert-butanol and 30 ml of water and filtered off. The filter residue was then mixed with 20 ml of tert-butanol and filtered again. After filtration, the catalyst was dried at 50 ° C. under reduced pressure (10 mbar) to constant weight.
Elementaranalyse, Thermogravimetrische Analyse und Extraktion: Cobalt = 12,4 Gew.-%, Zink = 31,6 Gew.-%, tert.-Butanol = 5,9 Gew.-%, 1,5-Cyclo- octandiol = 6,0 Gew.-% Beispiel 3 Herstellung eines DMC-Katalysators mit 1,2-CyclooctandiolElemental analysis, thermogravimetric analysis and extraction: cobalt = 12.4% by weight, zinc = 31.6% by weight, tert-butanol = 5.9% by weight, 1,5-cyclo-octanediol = 6, 0% by weight Example 3 Preparation of a DMC catalyst with 1,2-cyclooctanediol
Zu einer Mischung von 15 ml einer wässrigen 11,8 gew.-%igen Zinkchloridlösung, 13 ml tert.-Butanol, 6,5 ml einer wässrigen 7 gew.-%igen Milchsäure-Lösung und 0,4 g 1,2-Cyclooctandiol wurden unter starkem Rühren 9 ml einer wässrigenTo a mixture of 15 ml of an aqueous 11.8% by weight zinc chloride solution, 13 ml of tert-butanol, 6.5 ml of an aqueous 7% by weight lactic acid solution and 0.4 g of 1,2-cyclooctanediol 9 ml of an aqueous
7,4 gew.-%igen Kaliumhexacyanocobaltat-Lösung gegeben. Das gebildete Präzipitat wurde mit einer Mischung aus 10 ml tert.-Butanol und 30 ml Wasser gewaschen und abfiltriert. Der Filterrückstand wurde anschließend mit 20 ml tert.-Butanol versetzt und erneut filtriert. Nach Filtration wurde der Katalysator bei 50°C unter ver- mindertem Druck (10 mbar) bis zur Gewichtskonstanz getrocknet.7.4 wt .-% potassium hexacyanocobaltate solution given. The precipitate formed was washed with a mixture of 10 ml of tert-butanol and 30 ml of water and filtered off. The filter residue was then mixed with 20 ml of tert-butanol and filtered again. After filtration, the catalyst was dried at 50 ° C. under reduced pressure (10 mbar) to constant weight.
Elementaranalyse, Thermogravimetrische Analyse und Extraktion: Cobalt = 13,2 Gew.-%, Zink = 30,6 Gew.-%, tert.-Butanol = 6,2 Gew.-%, 1,2-Cyclo- octandiol = 4,82 Gew.-%Elemental analysis, thermogravimetric analysis and extraction: cobalt = 13.2% by weight, zinc = 30.6% by weight, tert-butanol = 6.2% by weight, 1,2-cyclo-octanediol = 4, 82% by weight
Beispiel 4 Herstellung eines DMC-Katalysators mit 1,5-CyclooctandiolExample 4 Preparation of a DMC catalyst with 1,5-cyclooctanediol
Zu einer Mischung von 10 ml einer wässrigen 6,6 gew.-%igen Zinkacetatlösung, 13 ml tert.-Butanol und 0,4 g 1,5-Cyclooctandiol wurden unter starkem Rühren 26,1 ml einer wässrigen 1,84 gew.-%igen Hexacyanocobaltsäure-Lösung gegeben.To a mixture of 10 ml of an aqueous 6.6% by weight zinc acetate solution, 13 ml of tert-butanol and 0.4 g of 1,5-cyclooctanediol were added 26.1 ml of an aqueous 1.84% by weight with vigorous stirring. % Hexacyanocobaltsäure solution given.
Anschließend wurden noch 15 ml einer wässrigen 11,8 gew.-%igen Zinkchloridlösung zugegeben. Das gebildete Präzipitat wurde mit einer Mischung aus 10 ml tert.-Butanol und 30 ml Wasser gewaschen und abfiltriert. Der Filterrückstand wurde anschließend mit 20 ml tert.-Butanol versetzt und erneut filtriert. Nach Filtration wurde der Katalysator bei 50°C unter vermindertem Druck (10 mbar) bis zurThen 15 ml of an aqueous 11.8% by weight zinc chloride solution were added. The precipitate formed was washed with a mixture of 10 ml of tert-butanol and 30 ml of water and filtered off. The filter residue was then mixed with 20 ml of tert-butanol and filtered again. After filtration, the catalyst was at 50 ° C under reduced pressure (10 mbar) to
Gewichtskonstanz getrocknet.Weight constant dried.
Elementaranalyse, Thermogravimetrische Analyse und Extraktion: Cobalt = 14,9 Gew.-%, Zink = 26,4 Gew.-%, tert.-Butanol = 7,0 Gew.-%, 1,5-Cyclo- octandiol = 4,6 Gew.-% Beispiel 5 Herstellung eines DMC-Katalysators mit 1,2-CyclooctandiolElemental analysis, thermogravimetric analysis and extraction: cobalt = 14.9% by weight, zinc = 26.4% by weight, tert-butanol = 7.0% by weight, 1,5-cyclo-octanediol = 4, 6% by weight Example 5 Preparation of a DMC catalyst with 1,2-cyclooctanediol
Zu einer Mischung von 10 ml einer wässrigen 6,6 gew.-%igen Zinkacetatlösung, 13 ml tert.-Butanol, 3 ml einer wässrigen 7 gew.-%igen Milchsäure-Lösung und 0,4 g 1,5-Cyclooctandiol wurden unter starkem Rühren 26,1 ml einer wässrigenTo a mixture of 10 ml of an aqueous 6.6 wt .-% zinc acetate solution, 13 ml of tert-butanol, 3 ml of an aqueous 7 wt .-% lactic acid solution and 0.4 g of 1,5-cyclooctanediol were added vigorous stirring 26.1 ml of an aqueous
1,84 gew.-%igen Hexacyanocobaltsäure-Lösung gegeben. Anschließend wurden noch 15 ml einer wässrigen 11,8 gew.-%igen Zinkchloridlösung zugegeben. Das gebildete Präzipitat wurde mit einer Mischung aus 10 ml tert.-Butanol und 30 ml Wasser gewaschen und abfiltriert. Der Filterrückstand wurde anschließend mit 20 ml tert.-Butanol versetzt und erneut filtriert. Nach Filtration wurde der Katalysator bei1.84 wt .-% Hexacyanocobaltsäure solution given. Then 15 ml of an aqueous 11.8% by weight zinc chloride solution were added. The precipitate formed was washed with a mixture of 10 ml of tert-butanol and 30 ml of water and filtered off. The filter residue was then mixed with 20 ml of tert-butanol and filtered again. After filtration, the catalyst became
50°C unter vermindertem Druck (10 mbar) bis zur Gewichtskonstanz getrocknet.50 ° C under reduced pressure (10 mbar) dried to constant weight.
Elementaranalyse, Thermogravimetrische Analyse und Extraktion: Cobalt = 14,9 Gew.-%, Zink = 28,0 Gew.-%, tert.-Butanol = 7,0 Gew.-%, 1,2-Cyclo- octandiol = 3,2 Gew.-%Elemental analysis, thermogravimetric analysis and extraction: cobalt = 14.9% by weight, zinc = 28.0% by weight, tert-butanol = 7.0% by weight, 1,2-cyclo-octanediol = 3, 2% by weight
Vergleichsbeispiel 6 Herstellung eines DMC-Katalysators ohne cyclisches PolyolComparative Example 6 Preparation of a DMC catalyst without cyclic polyol
Zu einer Mischung von 15 ml einer wässrigen 11,8 gew.-%igen Zinkchloridlösung, 13 ml tert.-Butanol wurden unter starkem Rühren 9 ml einer wässrigenTo a mixture of 15 ml of an aqueous 11.8% by weight zinc chloride solution and 13 ml of tert-butanol was added 9 ml of an aqueous with vigorous stirring
7,4 gew.-%igen Kaliumhexacyanocobaltat-Lösung gegeben. Das gebildete Präzipitat wurde mit einer Mischung aus 10 ml tert.-Butanol und 30 ml Wasser gewaschen und abfiltriert. Der Filterrückstand wurde anschließend mit 20 ml tert.-Butanol versetzt und erneut filtriert. Nach Filtration wurde der Katalysator bei 50°C unter verminder- tem Druck (10 mbar) bis zur Gewichtskonstanz getrocknet.7.4 wt .-% potassium hexacyanocobaltate solution given. The precipitate formed was washed with a mixture of 10 ml of tert-butanol and 30 ml of water and filtered off. The filter residue was then mixed with 20 ml of tert-butanol and filtered again. After filtration, the catalyst was dried to constant weight at 50 ° C. under reduced pressure (10 mbar).
Elementaranalyse, Thermogravimetrische Analyse und Extraktion: Cobalt = 15,7 Gew.-%, Zink = 27,8 Gew.-%, tert.-Butanol = 7,9 Gew.-% Herstellung von PolyetherpolyolenElemental analysis, thermogravimetric analysis and extraction: cobalt = 15.7% by weight, zinc = 27.8% by weight, tert-butanol = 7.9% by weight Manufacture of polyether polyols
Allgemeine DurchführungGeneral implementation
Zur Bestimmung der Aktivität der Katalysatoren wurden in einem 500 ml Druckreaktor 50 g Polypropylenglykol-Starter (MG = 1000 g/mol) und 20 mg Katalysator unter Schutzgas (Argon) vorgelegt und unter Rühren auf 130°C aufgeheizt.To determine the activity of the catalysts, 50 g of polypropylene glycol starter (MW = 1000 g / mol) and 20 mg of catalyst were placed under a protective gas (argon) in a 500 ml pressure reactor and heated to 130 ° C. with stirring.
Max. 50 g Propylenoxid wurden bei einem Druck von 2,5 bar innerhalb von 30 Minuten zudosiert. Nach 30 min wurde die Reaktionsmischung auf RT abgekühlt und von Propylenoxid durch Spülen mit Argon befreit.A maximum of 50 g of propylene oxide were metered in at a pressure of 2.5 bar within 30 minutes. After 30 min the reaction mixture was cooled to RT and freed from propylene oxide by flushing with argon.
Das Produkt wurde durch eine über GPC bestimmte Molmassenverteilung charakterisiert (Gewichtsmittel).The product was characterized by a molecular weight distribution determined by GPC (weight average).
Die nachfolgende Tabelle gibt die erhaltenen Ergebnisse wieder:The following table shows the results obtained:

Claims

Patentansprflche Patentansprflche
1. Doppelmetallcyanid (DMC)-Katalysator enthaltend1. Containing double metal cyanide (DMC) catalyst
a) mindestens eine Doppelmetallcyanid-Nerbindung,a) at least one double metal cyanide bond,
b) mindestens einen organischen Komplexliganden, der kein cyclisches Polyol ist, undb) at least one organic complex ligand that is not a cyclic polyol, and
c) mindestens ein cyclisches Polyol.c) at least one cyclic polyol.
2. DMC-Katalysator nach Anspruch 1, zusätzlich enthaltend d) Wasser und/oder e) wasserlösliches Metallsalz.2. DMC catalyst according to claim 1, additionally containing d) water and / or e) water-soluble metal salt.
3. DMC-Katalysator nach Anspruch 1 oder 2, worin die Doppelmetallcyanid-3. DMC catalyst according to claim 1 or 2, wherein the double metal cyanide
Nerbindung a) Zinkhexacyanocobaltat(III) ist.Nerbinding a) is zinc hexacyanocobaltate (III).
4. DMC-Katalysator nach einem der Ansprüche 1 bis 3, worin der orgamsche Komplexligand b) tert.-Butanol ist.4. DMC catalyst according to any one of claims 1 to 3, wherein the organic complex ligand b) is tert-butanol.
5. DMC-Katalysator nach einem der Ansprüche 1 bis 4, worin der Katalysator 1 bis 80 Gew.-% mindestens eines cyclischen Polyols enthält.5. DMC catalyst according to one of claims 1 to 4, wherein the catalyst contains 1 to 80 wt .-% of at least one cyclic polyol.
6. Verfahren zur Herstellung eines DMC-Katalysators, enthaltend die Schritte6. A process for producing a DMC catalyst comprising the steps
i) Umsetzung in wässriger Lösung von α) Metallsalzen mit Metallcyanidsalzen ß) organischen Komplexliganden, die keine cyclischen Polyole sind, und γ) cyclischen Polyolen, ii) Isolieren, Waschen und Trocknen des in Schritt i) erhaltenen Katalysators. Verfahren zur Herstellung von Polyetherpolyolen durch Polyaddition von Alkylenoxiden an aktive Wasserstoffatome aufweisenden Starterverbindungen in Gegenwart eines oder mehrerer DMC-Katalysatoren nach einem der Ansprüche 1 bis 5. i) reaction in aqueous solution of α) metal salts with metal cyanide salts ß) organic complex ligands which are not cyclic polyols and γ) cyclic polyols, ii) isolating, washing and drying the catalyst obtained in step i). Process for the preparation of polyether polyols by polyaddition of alkylene oxides onto starter compounds having active hydrogen atoms in the presence of one or more DMC catalysts according to one of Claims 1 to 5.
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