GB876960A - Process for the manufacture of isoprene from 4.4-dimethylmetadioxane - Google Patents

Process for the manufacture of isoprene from 4.4-dimethylmetadioxane

Info

Publication number
GB876960A
GB876960A GB32760/59A GB3276059A GB876960A GB 876960 A GB876960 A GB 876960A GB 32760/59 A GB32760/59 A GB 32760/59A GB 3276059 A GB3276059 A GB 3276059A GB 876960 A GB876960 A GB 876960A
Authority
GB
United Kingdom
Prior art keywords
phosphoric acid
impregnated
isobutene
dimethylmetadioxane
isoprene
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.)
Expired
Application number
GB32760/59A
Inventor
Michel Hellin
Fernand Coussemant
Daniel Lumbroso
Jean Pierre Servaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of GB876960A publication Critical patent/GB876960A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
    • C07C1/247—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms by splitting of cyclic ethers
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2521/00—Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
    • C07C2521/16—Clays or other mineral silicates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2527/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • C07C2527/14—Phosphorus; Compounds thereof
    • C07C2527/16—Phosphorus; Compounds thereof containing oxygen
    • C07C2527/167—Phosphates or other compounds comprising the anion (PnO3n+1)(n+2)-
    • C07C2527/173—Phosphoric acid or other acids with the formula Hn+2PnO3n+1

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Isoprene and formaldehyde together with some isobutene are formed from 4,4-dimethylmetadioxane in the vapour phase at elevated temperature in the presence of phosphoric acid impregnated on a silicate carrier having a specific surface not exceeding 100 square metres per gram, and being nonacidic and not chemically reactive to phosphoric acid. Suitable carriers are ground glass, asbestos and glass wool which is impregnated to give a catalyst containing 5-60% by weight of phosphoric acid after drying at about 280 DEG C. Reaction temperatures of 200-300 DEG C. are used at pressures up to 5 kg./cm.2, preferably atmospheric. Space velocities of 0.2-2 litres/litre of catalyst/hour are used. Diluents such as nitrogen, water vapour or paraffinic or naphthenic hydrocarbons may be used at amounts of 30-95% molar of the total charge. Unconverted dioxane may be recycled and where the charge is a mixture obtained from a process producing the dioxane from isobutene as in Specification 825,034, isobutene and formaldehyde obtained may be recycled to such process.ALSO:A catalyist for converting 4,4-dimethylmetadioxane to isoprene comprises phosphoric acid impregnated on a silicate carrier having a specific surface not exceeding 100 m.2/g. and being non-acidic and not reactive to phosphoric acid. Specified supports are ground glass, asbestos and glass wool, which may carry 5-60% by weight of total catalyst of phosphoric acid after drying at about 280 DEG C. The support is impregnated by immersion in aqueous phosphoric acid at atmospheric or reduced pressure or by pulverisation. Specification 825,034 is referred to.
GB32760/59A 1958-09-29 1959-09-25 Process for the manufacture of isoprene from 4.4-dimethylmetadioxane Expired GB876960A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR876960X 1958-09-29

Publications (1)

Publication Number Publication Date
GB876960A true GB876960A (en) 1961-09-06

Family

ID=9360797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32760/59A Expired GB876960A (en) 1958-09-29 1959-09-25 Process for the manufacture of isoprene from 4.4-dimethylmetadioxane

Country Status (1)

Country Link
GB (1) GB876960A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110444096A (en) * 2019-08-15 2019-11-12 长江师范学院 A kind of high-efficiency environment friendly senior chemistry paraffin oil decomposition experimental device and its application method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110444096A (en) * 2019-08-15 2019-11-12 长江师范学院 A kind of high-efficiency environment friendly senior chemistry paraffin oil decomposition experimental device and its application method

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