Process for preparing pentafluoroethane (R 125)

Details Process for preparing pentafluoroethane (R 125) Process for preparing pentafluoroethane (R 125)

1996-03-18

1998-06-09

Richter, Johann

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

Organic compounds

Halogen containing

C07C 1908

Patent

active

057637016

ABSTRACT:
The invention relates to a process for preparing pentafluoroethane (R 125) by reacting perchloroethylene with hydrogen fluoride in the gas phase over a chromium-containing catalyst, wherein the catalyst used comprises chromium and magnesium and is obtainable by reacting a water-soluble chromium(III) salt with magnesium hydroxide or magnesium oxide and, if desired, graphite in the presence of water, converting the reaction mixture into a paste, then drying the paste and treating it with hydrogen fluoride at temperatures of from 20.degree. to 500.degree. C., using such amounts of chromium(III) and magnesium salts and, if desired, graphite that the dried paste before treatment with hydrogen fluoride contains from 4.5 to 26% by weight of Cr, expressed as Cr.sub.2 O.sub.3, and at least 25% by weight of Mg, expressed as MgO, and, if desired, graphite.

REFERENCES:
patent: 3258500 (1966-06-01), Swamer et al.
patent: 3755477 (1973-08-01), Firth et al.
patent: 4547483 (1985-10-01), Muller et al.
patent: 5157172 (1992-10-01), Wanzke et al.
Chemical Abstract, vol. 113, No. 17, Oct. 22, 1990, Columbus, Ohio, US; abstract No. 151815; Morikawa S et al: "Fluorination of perchloroethylene" .

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