Chlorofluoro(hydro)carbon conversion process

US5679613A · kind A · utility

Assignee

• SOLVAY FLUOR und DERIVATE GmbH · DE

Inventors

• Hans-Walter Swidersky · Hannover, DE
• Johannes Eicher · Garbsen, DE
• Thomas Born · Holle, DE
• Carsten Brosch · Seelze, DE
• Werner Rudolph · Hannover, DE

Key dates

• Filing date: Mar 31, 1995
• Grant date: Oct 21, 1997
• Expiry date: Mar 31, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/358
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for preparing R113a from Rl13, and R123 from R123a or R123b by rearrangement over AlCl.sub.3, in which when the reaction mixture is heated sudden start-up of the reaction, which often causes large amounts of heat to be released and the reaction to run away, is prevented by using a specially activated AlCl.sub.3, which has been activated by means of a metal halide selected from the group consisting of NaF.multidot.nHF with 0<n.ltoreq.2, AgCl and FeCl.sub.3. In addition to it being considerably easier to control the reaction, shorter reaction times for the rearrangement and a decrease in the amount of by-products which are formed, are observed.