Chemical process

Details Chemical process Chemical process

1991-12-11

1993-09-07

Siegel, Alan

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

Organic compounds

Halogen containing

570166, 570167, 570168, 570169, C07C 1700

Patent

active

052431053

ABSTRACT:
1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride under superatmospheric pressure in a first reaction zone to form 1,1,1-trifluoro-2-chloroethane (133a) and reacting the 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in a second reaction zone to form 1,1,1,2-tetrafluoroethane; the entire product stream from the 133a reaction zone together with additional HF of required is fed through the 134a reaction zone. The two reaction zones may be provided within a single reaction vessel.

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

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