Process for the manufacture of hydrofluorocarbons

Details Process for the manufacture of hydrofluorocarbons Process for the manufacture of hydrofluorocarbons

1989-12-28

1995-04-11

Siegel, Alan

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

Organic compounds

Halogen containing

570175, C07C 1908

Patent

active

054060087

ABSTRACT:
A process for the manufacture of hydrofluorocarbons by the reaction of selected relatively low modular weight saturated and unsaturated hydrocarbons and corresponding partially halogenated hydrocarbons with elemental fluorine in the vapor phase. By selecting the ratio of F.sub.2 / substrate in combination with reaction temperature and reactor residence time the extent of fluorination of a substrate and degree of overfluorination can be controlled. Thus, starting with 1,1,1-trifluoroethane, CH.sub.3 CF.sub.3 (HFC-143a), 1,1,1,2-tetrafluoroethane, CH.sub.2 FCF.sub.3 (HFC-134a) is produced by simple thermal fluorination even in the presence of simultaneous formation of pentafluoroethane HFC-125. The use of compounds highly reactive toward fluorine are shown to promote the selective fluorination of partially fluorinated substrates.

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