GB886714A - Production of fluorocarbons - Google Patents

Production of fluorocarbons

Info

Publication number
GB886714A
GB886714A GB27356/59A GB2735659A GB886714A GB 886714 A GB886714 A GB 886714A GB 27356/59 A GB27356/59 A GB 27356/59A GB 2735659 A GB2735659 A GB 2735659A GB 886714 A GB886714 A GB 886714A
Authority
GB
United Kingdom
Prior art keywords
pyrolysis
chlorodifluoromethane
hexafluoropropylene
mixture
fluorocarbons
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
GB27356/59A
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 GB886714A publication Critical patent/GB886714A/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
    • C07C17/38—Separation; Purification; Stabilisation; Use of additives
    • C07C17/383—Separation; Purification; Stabilisation; Use of additives by distillation
    • C07C17/386—Separation; Purification; Stabilisation; Use of additives by distillation with auxiliary compounds
    • 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

<PICT:0886714/IV (b)/1> Hexafluoropropylene and perfluoro-cyclobutane are separated from a mixture of fluorocarbons obtained by the pyrolysis of chlorodifluoromethane at 400 DEG C. to 900 DEG C. followed by the removal of tetrafluoroethylene, hydrogen chloride and unreacted chlorodifluoro-methane from the mixture, by extractive distillation under liquid distillation conditions by aromatic or chlorinated aromatic hydrocarbons. The pyrolysis may be carried out from 0.05 to 5 seconds at a pressure between 0.1 to 2.0 atmospheres and the hydrocarbon may be alkyl or chlorosubstituted benzene such as xylene, toluene, chlorobenzene o- or p-chlorotoluene, or o-chloroethyl benzene preferably employed in from 1 to 25 times the amount of fluorocarbons produced in the pyrolysis. In an embodiment of the process, gases from the pyrolysis of chlorodifluoromethane in a multiple tube furnace (10), are cooled (11) and compressed (12) and tetrafluoroethylene and hydrogen chloride are distilled off (13), chlorodifluoromethane removed (15), and the compounds boiling higher than chlorohexafluoropropane removed (17), the mixture is then passed to an extractive distillation column (18) into which solvent is charged. The overhead fraction comprising pure hexafluoropropylene and perfluorocyclobutane is then separated in a further distillation column (19) and the solvent dried and recycled. Specified examples are given and the process may be employed for the preparation of hexafluoropropylene and perfluorocyclobutane. U.S.A. Specification 2,551,573 is referred to.
GB27356/59A 1958-08-14 1959-08-11 Production of fluorocarbons Expired GB886714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US886714XA 1958-08-14 1958-08-14

Publications (1)

Publication Number Publication Date
GB886714A true GB886714A (en) 1962-01-10

Family

ID=22212731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27356/59A Expired GB886714A (en) 1958-08-14 1959-08-11 Production of fluorocarbons

Country Status (3)

Country Link
DE (1) DE1108205B (en)
FR (1) FR1238480A (en)
GB (1) GB886714A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049241A (en) * 1990-03-27 1991-09-17 E. I. Du Pont De Nemours And Company Extractive distillation
WO1999044973A1 (en) * 1998-03-05 1999-09-10 E.I. Du Pont De Nemours And Company Processes for purifying perfluorocyclobutane

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049241A (en) * 1990-03-27 1991-09-17 E. I. Du Pont De Nemours And Company Extractive distillation
WO1999044973A1 (en) * 1998-03-05 1999-09-10 E.I. Du Pont De Nemours And Company Processes for purifying perfluorocyclobutane

Also Published As

Publication number Publication date
DE1108205B (en) 1961-06-08
FR1238480A (en) 1960-08-12

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