Process for the preparation of 1,1,1-trifluoro-2-2-dichloroethane under elevated pressure

US5254771A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans R. Cremer · Kerpen, DE
• Gunter Siegemund · Hofheim, DE
• Wilhelm Lendle · Bad Soden am Taunus, DE

Key dates

• Filing date: Feb 26, 1993
• Grant date: Oct 19, 1993
• Expiry date: Feb 26, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of 1,1,1-trifluoro-2,2-dichloroethane by chlorinating 1,1,1-trifluoro-2-chloroethane, in which the chlorination is carried out under an elevated pressure. The pressure is preferably 10 to 400 bar, particularly 50 to 250 bar. If the reaction is initiated by heat, it is preferably carried out at 200.degree. to 300.degree. C. If it is initiated by a free-radical starter, the reaction is preferably carried out at 150.degree. to 250.degree. C.