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

1996-10-15

1998-01-06

Prior, Kimberly J.

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

Organic compounds

Halogen containing

570134, 570161, C07C 1738, C07C 1908

Patent

active

057057184

ABSTRACT:
To remove the unsaturated 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, of hydrofluoric acid and of chlorine is treated in gaseous phase in the presence of a fluorination catalyst at a temperature of between 100.degree. and 300.degree. C. and at a pressure between atmospheric pressure and 2.5 MPa, the molar ratio HF/F134a being between 0.05 and 0.5 and the molar ratio Cl.sub.2 /F134a between 0.0001 and 0.1.

REFERENCES:
patent: H1129 (1993-01-01), Gumprecht
patent: 4158675 (1979-06-01), Potter
Database WPI, Derwent Pub. Ltd., JP-A-5 032 567 (Feb. 1993).
Database WPI, Derwent Pub. Ltd., JP-A-4 321 632 (Nov. 1992).

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