C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
204/91.27, 260/6
C07C 21/18 (2006.01) B01J 23/18 (2006.01) B01J 27/12 (2006.01) C07C 17/08 (2006.01)
Patent
CA 1087213
ABSTRACT OF THE DISCLOSURE: A process for the production of 1,1-difluoroethylene by photochlorinating 1,1-difluoroethane to form 1,1-difluoro-1-chloro- ethane and heating the reaction products obtained to temperatures of from 550 to 750°C. The process is characterised in that the difluoroethane used is an unpurified reaction product of the cata- lytic hydrofluorination of acetylene and contains up to 3 % by vo- lume of acetylene and at most 8 % by volume of vinyl fluoride. Despite the presence of impurities, namely acetylene and vinyl fluoride, in the starting product, yields of 1,1-difluoroethylene amounting to more than 90 %, based on the acetylene used, are ob- tained where this process is applied. Accordingly, the secondary products present, particularly the unreacted acetylene, have hard- ly any effect upon the reaction as a whole. This is surprising in- sofar as it was not known that gas mixtures containing acetylene could be photochlorinated without difficulty.
294154
Martens Peter
Schultz Neithart
Vahlensieck Hans-Joachim
Dynamit Nobel Aktiengesellschaft
Robic Robic & Associes/associates
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