Method of preparing 1,1-difluoroethylene from acetylene

Details Method of preparing 1,1-difluoroethylene from acetylene Method of preparing 1,1-difluoroethylene from acetylene

1977-12-01

1979-12-11

Sebastian, Leland A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

204163R, 252464, 2606536, C07C 1734

Patent

active

041783166

ABSTRACT:
An improvement in a method of preparing 1,1-difluoroethylene from 1,1-difluoroethane by photochlorinating 1,1-difluoroethane to 1,1-difluoro-1-chloroethane and immediately thereafter reacting the reaction products of the photochlorination at a temperature between 550 and 750.degree. C. without isolation of the 1,1-difluoro-1-chloroethane, the improvement residing in employing as the difluoroethane charge an unrefined product of the hydrofluorination of acetylene which unrefined reaction product contains up to 3 volume percent acetylene and a maximum of 8 volume percent vinyl fluoride, especially a unrefined reaction product in which the difluoroethane has not been isolated.

REFERENCES:
patent: 2644845 (1953-07-01), McBee
patent: 3073871 (1963-01-01), Snavely et al.
patent: 3187060 (1965-06-01), Petit et al.
patent: 3697443 (1972-10-01), Shinoda et al.
patent: 3720722 (1973-03-01), Wada et al.
patent: 4053529 (1977-10-01), Martens

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