Vapor phase synthesis of hexafluoroisobutylene

Details Vapor phase synthesis of hexafluoroisobutylene Vapor phase synthesis of hexafluoroisobutylene

1986-01-17

1987-11-10

Moyer, Donald B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570153, C07C 1726

Patent

active

047059044

ABSTRACT:
A vapor phase synthesis of hexafluoroisobutylene, which comprises contacting in the vapor phase in a catalyst zone, B, of a reactor hexafluoropropylene oxide with a fluorinated catalyst such as fluorinated silica-alumina at a temperature of about 400.degree.-600.degree. C. for a residence time sufficient to form a vapor stream comprising hexafluoroacetone which is thereafter directly contacted in a heating zone of the reactor with a vapor stream comprising a keytone-generating compound such as acetic anhydride at a temperature of about 500.degree.-700.degree. C. for a residence time sufficient to form a stream comprising hexafluoroisobutylene, substantially-free of perfluoroisobutylene and recovering the hexafluoroisobutylene product is disclosed. A direct one reactor vapor phase synthesis of hexafluoroisobutylene which comprises (a) contacting, in the vapor phase, hexafluoropropene with less than a stoichiometric amount of oxygen required to convert substantially all the hexafluoroisopropene into hexafluoropropylene oxide in the presence of a fluorinated catalyst such as fluorinated silica-alumina at a temperature of about 400.degree.-600.degree. C. for a time sufficient to form a vapor stream comprising hexafluoropropylene oxide substantially-free of oxygen; (b) directly contacting said vapor stream, in a catalyst zone, B, containing a fluorinated catalyst which is preferably the same as used in catalyst zone, A, at a temperature of about 400.degree.-650.degree., preferably about 500.degree.-650.degree. C. for a time sufficient to form a vapor stream comprising hexafluoroacetone; (c) directly contacting the vapor stream comprising hexafluroacetone with a vaporized compound such as acetic anhydride at a temperature of about 500.degree.-700.degree. C., preferably about 600.degree. C. for a time sufficient to form a vapor stream comprising hexafluoroisobutylene, substantially-free of perfluoroisobutylene; and (d) recovering hexafluoroisobutylene is also disclosed.

REFERENCES:
patent: 3332965 (1967-07-01), Fukui et al.
patent: 3894097 (1975-07-01), Vanderkooi et al.
patent: 3946081 (1976-03-01), Wedemeyer et al.
patent: 4057584 (1977-11-01), Torizuka et al.
patent: 4400546 (1983-08-01), Rammelt et al.

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