Patent · US Expired

Process for the preparation of 1,1,1-Trifluoro-2-chloroethane

US5157172A · kind A · utility

5Cited by

3References

8Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Wolfgang Wanzke · Meitingen, DE
Gunter Siegemund · Hofheim, DE
Thomas Muller · Bad Homburg vor der Höhe, DE

Key dates

Filing date	Mar 2, 1992
Grant date	Oct 20, 1992
Priority date	—
Expiry date	Mar 2, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C17/21
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of 1,1,1-trifluoro-2-chloroethane from trichloroethene and hydrogen fluoride in the gas phase. In this process a catalyst containing chromium and magnesium is used, which catalyst is obtainable by precipitating chromium(III) hydroxide by reacting 1 mole of a water-soluble chromium(III) salt with at least 1.5 mol of magnesium hydroxide or magnesium oxide in the presence of water, converting the reaction mixture into a paste containing chromium hydroxide and a magnesium salt and then drying the paste and treating it at temperatures of 20.degree. to 500.degree. C. with hydrogen fluoride.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.