Process for removing 2-chloro-1,1-difluoroethylene from 1,1,1,2-

Details Process for removing 2-chloro-1,1-difluoroethylene from 1,1,1,2- Process for removing 2-chloro-1,1-difluoroethylene from 1,1,1,2-

1991-12-18

1994-08-09

Manoharan, Virginia

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203DIG6, 203DIG16, 204 59F, 20415811, 570177, 570178, B01D 334, C07C 1700

Patent

active

053363779

ABSTRACT:
2-Chloro-1,1-difluoroethylene (R-1122) is removed from 1,1,1,2-tetrafluoroethane (R-134a) by contacting the R-134a in the vapor phase with chlorine in the presence of ultraviolet light providing an exposure of at least about 2 watts-hour/kg.

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Yano et al, J. Chem. Phys. vol. 72, No. 5, Mar. 1, 1980, "Vacuum-ultraviolet (147 nm) photodecomposition of 1,1,2-trichloro-2,2-difluoroethane."
Yano et al, The Journal of Physical Chemistry, vol. 83, No. 20, 1979, pp. 2572-2577 "Photodecomposition of 1,1-Difluoroethane at 147 nm."
Gordon A. J. and R. A. Ford, The Chemists Companion, Wiley Interscience (1972), pp. 362-368.

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