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GB917093A - Process for producing fluoroolefins - Google Patents

Process for producing fluoroolefins

Info

Publication number
GB917093A
GB917093A GB34422/61A GB3442261A GB917093A GB 917093 A GB917093 A GB 917093A GB 34422/61 A GB34422/61 A GB 34422/61A GB 3442261 A GB3442261 A GB 3442261A GB 917093 A GB917093 A GB 917093A
Authority
GB
United Kingdom
Prior art keywords
chlorodifluoromethane
pyrolysis
pressure
octafluorocyclobutane
hexafluoropropylene
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
GB34422/61A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB917093A publication Critical patent/GB917093A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/26—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton
    • C07C17/263—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton by condensation reactions
    • C07C17/269—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton by condensation reactions of only halogenated hydrocarbons

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Tetrafluoroethylene and hexafluoropropylene are produced by pyrolysing crude or pure chlorodifluoromethane at a temperature of 700 to 900 DEG C. and a pressure of 0.1 to 2 atmospheres for a time of 0.1 to 10 seconds to obtain a conversion (as defined in the Specification) of the chlorodifluoromethane to pyrolysis products of between 86% and 94%. The reaction is preferably carried out at a chlorodifluoromethane pressure of 0.5 to 1.2 atmospheres, the partial pressure being varied for example by dilution of the chlorodifluoromethane with nitrogen, helium or carbon dioxide. The process is preferably carried out in a tubular reactor through which the starting materials are caused to flow, the temperature in the reactor preferably increasing in the direction of flow of the chlorodifluoromethane. Octafluorocyclobutane may also be formed during the pyrolysis and, together with unreacted chlorodifluoromethane, may be separated from the reaction products and recycled, the pyrolysis of octafluorocyclobutane producing tetrafluoroethylene and hexafluoropropylene. The pyrolysis products may be separated by fractional distillation or by extractive distillation in the presence of hydrocarbons or chlorinated hydrocarbons. Numerous examples and comparative examples are given. Specification 481,405 and U.S.A. Specification 2,758,138 are referred to.
GB34422/61A 1960-09-28 1961-09-26 Process for producing fluoroolefins Expired GB917093A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US58895A US3306940A (en) 1960-09-28 1960-09-28 Process for the manufacture of perfluoroolefins

Publications (1)

Publication Number Publication Date
GB917093A true GB917093A (en) 1963-01-30

Family

ID=22019577

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34422/61A Expired GB917093A (en) 1960-09-28 1961-09-26 Process for producing fluoroolefins

Country Status (5)

Country Link
US (1) US3306940A (en)
BE (1) BE608590A (en)
DE (1) DE1170935B (en)
GB (1) GB917093A (en)
NL (2) NL122622C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1236497B (en) * 1965-02-02 1967-03-16 Fluorwerke Dohna Process for the production of perfluoropropene
US3337645A (en) * 1963-04-05 1967-08-22 Mobil Oil Corp Catalytic conversion of fluorocarbons

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873630A (en) * 1972-06-12 1975-03-25 Du Pont Process for pyrolyzing tetrafluoroethylene to hexafluoropropylene
GB8708618D0 (en) * 1987-04-10 1987-05-13 Ici Plc Production process
US5043491A (en) * 1989-12-19 1991-08-27 E. I. Du Pont De Nemours And Company Multistep synthesis of hexafluoropropylene
US5057634A (en) * 1989-12-19 1991-10-15 E. I. Du Pont De Nemours And Company Multistep synthesis of hexafluoropropylene
US5068472A (en) * 1989-12-19 1991-11-26 E. I. Du Pont De Nemours And Company Multistep synthesis of hexafluoropropylene
US5474657A (en) * 1994-02-10 1995-12-12 Minnesota Mining And Manufacturing Company Preparation of F-alkyl F-isobutyl ethers by electrochemical fluorination
JP3946764B2 (en) * 1995-02-17 2007-07-18 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー Synthesis of tetrafluoroethylene
US20020032356A1 (en) 2000-07-14 2002-03-14 Gelblum Peter Gideon Synthesis of perfluoroolefins
US6924403B2 (en) * 2002-06-26 2005-08-02 E. I. Du Pont De Nemours And Company Synthesis of hexafluoropropylene
CN110078586B (en) * 2019-05-06 2022-05-27 聊城氟尔新材料科技有限公司 Device and process for co-production of hexafluoropropylene from tetrafluoroethylene and application of device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2404374A (en) * 1943-04-23 1946-07-23 Du Pont Polyfluorinated cycloparaffins and process for producing them
US2551573A (en) * 1945-11-30 1951-05-08 Du Pont Pyrolysis of chloro-fluoro alkanes
US2617836A (en) * 1951-04-18 1952-11-11 Minnesota Mining & Mfg Production of olefinic c4f8
US2758138A (en) * 1954-05-06 1956-08-07 Du Pont Pyrolysis process for making perfluoropropene from tetrafluoroethylene
DE1073475B (en) * 1958-07-29 1960-01-21 Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius &. Brüning, Frankfurt/M Process for the production of tetrafluoroethylene
US2979539A (en) * 1959-01-06 1961-04-11 Minnesota Mining & Mfg Difluorocarbene free radicals in the synthesis of fluorinated olefinic compounds
US3016405A (en) * 1959-01-07 1962-01-09 Du Pont Metal catalyzed pyrolysis of fluoromethanes
US3022357A (en) * 1959-10-08 1962-02-20 Du Pont Purification of fluorocarbons
US3009966A (en) * 1960-02-08 1961-11-21 Pennsalt Chemicals Corp Production of fluorinated compounds

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337645A (en) * 1963-04-05 1967-08-22 Mobil Oil Corp Catalytic conversion of fluorocarbons
DE1236497B (en) * 1965-02-02 1967-03-16 Fluorwerke Dohna Process for the production of perfluoropropene

Also Published As

Publication number Publication date
NL122622C (en)
BE608590A (en) 1962-03-27
NL269647A (en)
DE1170935B (en) 1964-05-27
US3306940A (en) 1967-02-28

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