Regeneration of zeolites used for purifying 1,1,1,2-tetrafluoroe

Details Regeneration of zeolites used for purifying 1,1,1,2-tetrafluoroe Regeneration of zeolites used for purifying 1,1,1,2-tetrafluoroe

1990-04-10

1992-02-11

Siegel, Alan

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

Organic compounds

Halogen containing

502 34, 502 36, 502 38, 502 39, C07C 1739, B01J 2034

Patent

active

050877780

ABSTRACT:
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.

REFERENCES:
patent: 4906796 (1990-03-01), Yates
patent: 4940824 (1990-07-01), Yates
patent: 4940825 (1990-07-01), Yates

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