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

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

1995-08-18

1997-08-05

Siegel, Alan

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

Organic compounds

Halogen containing

570168, C07C 1708

Patent

active

056544944

ABSTRACT:
This invention relates to a process for producing 1,1,1,2-tetrafluoroethane (HFC-134a). The process reacts, 1,1,1-trifluoro-2-chloroethane (HCFC-133a) and hydrogen fluoride in a first reactor. The product resulting from the first reaction step is brought to a second reactor together with trichloroethylene and hydrogen fluoride. The second reaction is conducted at a higher temperature than the first reactor. Optionally, HCl is removed prior to removal of the crude HFC-134a product. Unreacted HCFC-133a, trichloroethylene and hydrogen fluoride may be recycled back to the first reactor.

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patent: 5395998 (1995-03-01), Koyama et al.
patent: 5444171 (1995-08-01), Ohno et al.

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