Process for the preparation of 1,1,1,3,3-pentafluoropropane

US5728904A · kind A · utility

Assignee

• AlliedSignal, Inc. · US

Inventors

• Michael Van Der Puy · Amherst, US
• Richard E. Eibeck · Orchard Park, US
• Lois Anne Short Ellis · Orchard Park, US
• G. V. Bindu Madhavan · Monroeville, US

Key dates

• Filing date: Jul 15, 1996
• Grant date: Mar 17, 1998
• Expiry date: Jul 15, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/278
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

This invention is related to the preparation of hydrofluorocarbons (HFCs). Specifically, it relates to the manufacture of 1,1,1,3,3-pentafluoropropane, CF.sub.3 CH.sub.2 CF.sub.2 H (HFC-245fa) by the steps comprising (1) the formation of CCl.sub.3 CH.sub.2 CCl.sub.3 by the reaction of CCl.sub.4 with vinylidene chloride; (2) the conversion of CCl.sub.3 CH.sub.2 CCl.sub.3 to CF.sub.3 CH.sub.2 CF.sub.2 Cl by reaction with HF in the presence of a fluorination catalyst, selected from TiCl.sub.4, SnCl.sub.4 or mixtures thereof; and (3) reduction of CF.sub.3 CH.sub.2 CF.sub.2 Cl to CF.sub.3l CH.sub.2 CF.sub.2 H.