Process for the purification of 1,1,1,2-tetrafluoroethane

Details Process for the purification of 1,1,1,2-tetrafluoroethane Process for the purification of 1,1,1,2-tetrafluoroethane

1994-10-26

1995-07-04

Siegel, Alan

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

Organic compounds

Halogen containing

C07C 1738

Patent

active

054302056

ABSTRACT:
In order to remove the olefinic impurities (in particular 1-chloro-2,2-difluoroethylene and polyfluoropropenes) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a, hydrofluoric acid and oxygen or air is treated in the gas phase, in the presence of a fluorination catalyst, at a temperature between 200.degree. and 350.degree. C. and at a pressure between atmospheric pressure and 2.5 MPa, the HF/F134a molar ratio being between 0.05 and 0.5 and the O.sub.2 /F134a molar ratio being between 0.001 and 0.1.

REFERENCES:
patent: 5326918 (1994-07-01), Correia

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