Chemical process for the manufacture of 1,1,1,2-tetrafluoroethan

Details Chemical process for the manufacture of 1,1,1,2-tetrafluoroethan Chemical process for the manufacture of 1,1,1,2-tetrafluoroethan

1993-06-30

1995-01-17

Siegel, Alan

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

Organic compounds

Halogen containing

570165, 570167, 570168, 570169, C07C 1708, C07C 1700

Patent

active

053827228

ABSTRACT:
1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride in one reactor to form 1,1,1-trifluoro-2-chloroethane (133a) and reacting the 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in another reactor to form 1,1,1,2-tetrafluoroethane. The invention is characterized by reversing the reactor sequence and passing the entire product stream from the HFA 134a reactor together with trichloroethylene through the 133a reactor and separating 134a and hydrogen chloride from the recycle stream between the 133a reactor and the 134a reactor.

REFERENCES:
patent: 2005710 (1935-06-01), Daudt
patent: 2637747 (1953-05-01), McBee
patent: 4129603 (1978-12-01), Bell
patent: 4158675 (1979-06-01), Potter
patent: 4605798 (1986-08-01), Abel

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