Method for concurrently producing 1,1,1,2-tetrafluoroethane and

Details Method for concurrently producing 1,1,1,2-tetrafluoroethane and Method for concurrently producing 1,1,1,2-tetrafluoroethane and

1996-09-05

1998-03-03

Siegel, Alan

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

Organic compounds

Halogen containing

570169, C07C 1708

Patent

active

057237000

ABSTRACT:
There is a method for concurrently producing 1,1,1,2-tetrafluoroethane and pentafluoroethane, which comprises (A) reacting 1,1,1-trifluoro-2-chloroethane, hydrogen fluoride and chlorine in a first reactor in the presence of flurorination catalyst at a temperature in the range of from 300.degree. C. to 450.degree. C.; (B) transfering the products of step (A) together with trichloroethylene to a second reactor and reacting them at a temperature in the range of from 200.degree. C. to 400.degree. C.; (C) separating 1,1,1,2-tetrafluoroethane and pentafluoroethane from the resultant products; and (D) feeding the remaining products from step (C) back to the first reactor, wherein the molar ratio of chlorine/1,1,1-trifluoro-2-chloroethanethe in step (A) is in the range of from 0.001 to 0.05

REFERENCES:
patent: 3157707 (1964-11-01), Clark
patent: 5258561 (1993-11-01), Nappa et al.
patent: 5382722 (1995-01-01), Scott et al.
patent: 5500400 (1996-03-01), Kim et al.

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