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

US5654494A · kind A · utility

Assignee

• AlliedSignal, Inc. · US

Inventors

• Hsueh Sung Tung · Getzville, US
• Paul Gene Clemmer · Williamsville, US
• Gustavo Cerri · Parsippany, US
• Yuon Chiu · Dover, US
• Stanley Michael Jaskot · Baton Rouge, US
• Nemesio Rogelio Viso · Baton Rouge, US
• Addison M. Smith · Amherst, US
• Jeffrey Warren McKown · East Aurora, US
• Jay Philip Friedenson · Dover, US

Key dates

• Filing date: Aug 18, 1995
• Grant date: Aug 5, 1997
• Expiry date: Aug 18, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/383
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

This invention relates to a process for producing 1,1,1,2-tetrafluoroethane (HFC-134a). The process reacts, 1,1,1-trifluoro-2-chloroethane (HCFC-133a) and hydrogen fluoride in a first reactor. The product resulting from the first reaction step is brought to a second reactor together with trichloroethylene and hydrogen fluoride. The second reaction is conducted at a higher temperature than the first reactor. Optionally, HCl is removed prior to removal of the crude HFC-134a product. Unreacted HCFC-133a, trichloroethylene and hydrogen fluoride may be recycled back to the first reactor.