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

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

1994-12-23

1997-02-04

Siegel, Alan

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

Organic compounds

Halogen containing

570168, C07C 1708

Patent

active

056000391

ABSTRACT:
The subject of the invention is a continuous process for the preparation of 1,1,1,2-tetrafluoroethane (134a) from 2-chloro-1,1,1-trifluoroethane (133a) and hydrofluoric acid in the gaseous phase in the presence of a chromium-based catalysts.
According to the invention, the flow of gas leaving the reactor is subjected to a distillation in order to separate at the top a flow containing almost all the HC1 and at least 90% of the 134a produced by the reaction and at the bottom a flow containing at least 90% of the unconverted reactants (133a and HF), and the latter flow is recycled directly to the reactor, without any purifying operation.

REFERENCES:
patent: 4158675 (1979-06-01), Potter

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