Regeneration of zeolites used for purifying...

Details Regeneration of zeolites used for purifying... Regeneration of zeolites used for purifying...

C - Chemistry, Metallurgy

07

C

C07C 19/08 (2006.01) B01J 20/34 (2006.01) C07C 17/38 (2006.01) C07C 17/389 (2006.01)

Patent

CA 2078224

2078224 9115445 PCTABS00007 1,1,1,2-Tetrafluoroethane (R134a) is purified to remove 50-10,000 wt. ppm of 2-chloro-1,1-difluoroethylene (R1122) by contacting with a zeolite or carbon molecular sieve having an average pore diameter of 3.8 to 4.8 Angstroms. The zeolite or carbon molecular sieve is regenerated by inert gas stripping residual R134a, followed by a regeneration at elevated temperatures using an inert gas. Regeneration of the zeolite or carbon molecular sieve is accomplished without the substantial reduction in capacity for impurities.

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