Patent · US Expired

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

US6288293A · kind A · utility

0Cited by

4References

10Claims

0Family size

Assignee

SOLVAY (Société Anonyme) · BE

Inventors

Wolfgang Wanzke · Meitingen, DE
Gunter Siegemund · Hofheim, DE
Wilfried Schmieder · Hofheim, DE

Key dates

Filing date	Jun 21, 1993
Grant date	Sep 11, 2001
Priority date	—
Expiry date	Jun 21, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C17/206
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

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

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