DE4132211A1 - 2,2-Bis-(3,4-di:methyl phenyl) propane prepn. in high yield - Google Patents
2,2-Bis-(3,4-di:methyl phenyl) propane prepn. in high yieldInfo
- Publication number
- DE4132211A1 DE4132211A1 DE19914132211 DE4132211A DE4132211A1 DE 4132211 A1 DE4132211 A1 DE 4132211A1 DE 19914132211 DE19914132211 DE 19914132211 DE 4132211 A DE4132211 A DE 4132211A DE 4132211 A1 DE4132211 A1 DE 4132211A1
- Authority
- DE
- Germany
- Prior art keywords
- prepn
- chloropropene
- dichloropropane
- propane
- bis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/86—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon
- C07C2/861—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon the non-hydrocarbon contains only halogen as hetero-atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von 2,2-Dichlorpropan aus Gemischen von 2-Chlorpropen und 1-Chlorpropenen durch Umsetzung mit Chlorwasserstoff.The invention relates to a method for producing 2,2-dichloropropane from mixtures of 2-chloropropene and 1-chloropropenes by reaction with hydrogen chloride.
Es wurde gefunden, daß es möglich ist, durch selektive Umsetzung des 2-Chlorpropens, das im Gemisch mit 1- Chlorpropenen vorliegt, mit Chlorwasserstoff ein Gemisch aus 2,2-Dichlor-propan und 1-Chlorpropenen zu erhalten, das z. B. durch fraktionierende Destillation sehr leicht in 1-Chlorpropen-Gemisch und reines 2,2-Dichlorpropan aufgetrennt werden kann. Dadurch wird die aufwendige Trennung von 2- und 1-Chlorpropenen umgangen (2-Chlor propen: Siedepunkt 22,6° C, E/Z-1-Chlorpropene Siede bereich 30,8°C bis 37° C, 2,2-Dichlorpropan: Siedepunkt 69,5°C). Es ist bekannt, daß sowohl 2- als auch E- und Z-1-Chlorpropen bei der Umsetzung mit Chlorwasserstoff HCl-Additionsprodukte ergeben, aber es ist überraschend, daß die Addition an 2-Chlorpropen soviel schneller als an 1-Chlorpropene erfolgt, daß sich daraus ein vorteil haftes Herstellungsverfahren für reines 2,2-Dichlor propan ergibt. Die Umsetzung kann unter Normaldruck oder Überdruck durchgeführt werden; vorteilhaft wird im Be reich von 2 bis 50 bar gearbeitet. Die eingesetzte HCl- Menge sollte mindestens stöchiometrisch zur im Edukt- Gemisch enthaltenen 2-Chlorpropenmenge sein. Vorteilhaft werden Friedel-Crafts-Katalysatoren zur Beschleunigung der HCl-Addition eingesetzt.It has been found that it is possible through selective Implementation of 2-chloropropene, mixed with 1- Chloropropenes are present, a mixture with hydrogen chloride to obtain from 2,2-dichloropropane and 1-chloropropene, the Z. B. very easily by fractional distillation in 1-chloropropene mixture and pure 2,2-dichloropropane can be separated. This makes the elaborate Bypassed separation of 2- and 1-chloropropenes (2-chloro propene: boiling point 22.6 ° C, E / Z-1-chloropropene boiling range 30.8 ° C to 37 ° C, 2,2-dichloropropane: boiling point 69.5 ° C). It is known that both 2- and E- and Z-1-chloropropene in the reaction with hydrogen chloride HCl addition products result, but it's surprising that the addition to 2-chloropropene is so much faster than on 1-chloropropenes is an advantage Adherent manufacturing process for pure 2,2-dichloro propane results. The implementation can be done under normal pressure or Pressure can be carried out; is advantageous in loading worked from 2 to 50 bar. The HCl- The amount should be at least stoichiometric to that in the educt Amount of 2-chloropropene contained in the mixture. Advantageous become Friedel-Crafts catalysts for acceleration the HCl addition.
275 g eines Chlorpropengemisches, nach GC-Analyse 68,6% E/Z-1-Chlorpropene und 27,8% 2-Chlor-propen enthaltend, wurde unter Zusatz von 1,3 g wasserfreiem Eisen-(III) chlorid in einem 1 l-Rührautoklaven bei 10 bar mit Chlorwasserstoffgas behandelt. Die Reaktionstemperatur betrug 50°C, die Reaktionszeit 3 Stunden. Nach der Um setzung enthielt das Reaktionsgemisch nach GC-Analyse 58,0% E/Z-l-Chlorpropene und 39,3% 2,2-Dichlorpropan, d. h. die HCl-Addition erfolgte selektiv an das 2-Chlor propen. Nach Behandlung des Rohgemisches mit Wasser und Trocknung der organischen Phase mit Calciumchlorid wurde das Gemisch durch fraktionierende Destillation an einer 60 cm-Füllkörperkolonne getrennt. Man erhielt 99 g (= 88% d. Th.) 2,2-Dichlorpropan vom Siedebereich 68- 70°C.275 g of a chloropropene mixture, according to GC analysis 68.6% Containing E / Z-1-chloropropene and 27.8% 2-chloropropene, was added 1.3 g of anhydrous iron (III) chloride in a 1 l stirred autoclave at 10 bar Treated hydrogen chloride gas. The reaction temperature was 50 ° C, the reaction time 3 hours. After the order settlement contained the reaction mixture after GC analysis 58.0% E / Z-1-chloropropene and 39.3% 2,2-dichloropropane, d. H. the HCl was added selectively to the 2-chlorine propen. After treating the raw mixture with water and The organic phase was dried with calcium chloride the mixture by fractional distillation on a 60 cm packed column separated. 99 g were obtained (= 88% of theory) 2,2-dichloropropane with boiling range 68- 70 ° C.
Claims (1)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914132211 DE4132211A1 (en) | 1991-09-27 | 1991-09-27 | 2,2-Bis-(3,4-di:methyl phenyl) propane prepn. in high yield |
EP95105012A EP0665202A2 (en) | 1991-02-22 | 1992-02-10 | Process for the preparation of 2,2-dichloropropane |
EP92102155A EP0499925B1 (en) | 1991-02-22 | 1992-02-10 | Process for the preparation of 2,2-Bis-(3,4-Dimethyl-Phenyl)-propane |
DE59204022T DE59204022D1 (en) | 1991-02-22 | 1992-02-10 | Process for the preparation of 2,2-bis (3,4-dimethylphenyl) propane. |
CS92399A CZ281498B6 (en) | 1991-02-22 | 1992-02-11 | Process for preparing 2,2-bis(3,4-dimethylphenyl)propane |
JP4059217A JPH0585957A (en) | 1991-02-22 | 1992-02-14 | Process for preparing 2,2-bis(3,4-dimethylphenyl)propane |
PL92293562A PL167274B1 (en) | 1991-02-22 | 1992-02-21 | Method of obtaining 2,2-bis-/3,4-dimethyl-phenyl/-propane |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914132211 DE4132211A1 (en) | 1991-09-27 | 1991-09-27 | 2,2-Bis-(3,4-di:methyl phenyl) propane prepn. in high yield |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4132211A1 true DE4132211A1 (en) | 1993-04-01 |
Family
ID=6441626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19914132211 Withdrawn DE4132211A1 (en) | 1991-02-22 | 1991-09-27 | 2,2-Bis-(3,4-di:methyl phenyl) propane prepn. in high yield |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4132211A1 (en) |
-
1991
- 1991-09-27 DE DE19914132211 patent/DE4132211A1/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8130 | Withdrawal |