Process for the preparation of hexafluoropropene

US5334783A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Reinhold Freudenreich · Altötting, DE
• Ingolf Mielke · Altötting, DE
• Karl Rettenbeck · Altötting, DE
• Thomas Schottle · Burghausen, DE

Key dates

• Filing date: Sep 22, 1992
• Grant date: Aug 2, 1994
• Expiry date: Sep 22, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/361
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of hexafluoropropene by thermal cleavage of chlorotetrafluoroethane and/or chlorohexafluoropropane or a mixture of chlorotetrafluoroethane and perfluorocyclobutane at 600.degree. to 1,000.degree. C. and under a pressure of 1 to 1,000 kPa is described. The thermal cleavage is carried out in the presence of at least 0.05 mole of tetrafluoroethylene per mole of chlorotetrafluoroethane and/or chlorohexafluoropropane or mixture of chlorotetrafluoroethane and perfluorocyclobutane employed. By means of this process hexafluoropropene is obtained for a small extra expenditure on apparatus at a good selectivity and in an improved space-time yield.