Process for the purification of difluoromethane

Details Process for the purification of difluoromethane Process for the purification of difluoromethane

1995-09-26

1997-03-04

Evans, Joseph E.

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

Organic compounds

Halogen containing

502 25, C07C 1738, C07C 17389, B01J 2034, B01J 3864

Patent

active

056081294

ABSTRACT:
To remove the traces of chlorofluoromethane present in a difluoromethane, the difluoromethane to be purified is passed over a 13X molecular sieve at a temperature of at least 60.degree. C.
The sieve can be regenerated by washing with the aid of a solution of sodium or potassium carbonate and heating to high temperature under inert atmosphere or in vacuum.

REFERENCES:
patent: 3215747 (1965-11-01), Fainberg et al.
patent: 4558022 (1985-12-01), Farmerie
patent: 4906796 (1990-03-01), Yates
patent: 5001094 (1991-03-01), Chang et al.
patent: 5210342 (1993-05-01), Moore

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