The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 1994
Filed:
Nov. 12, 1992
Vinci M Felix, Kennett Square, PA (US);
William H Gumprecht, Wilmington, DE (US);
Barry A Mahler, Glen Mills, PA (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
An improved process for the manufacture of CF.sub.3 CHF.sub.2 by contacting 1,2-dichloro-1,1,2-trifluoroethane (CClF.sub.2 CHClF) or 1-chloro-1,1,2,2-tetrafluoroethane (CHF.sub.2 CClF.sub.2) or mixtures of CF.sub.3 CHCl.sub.2 and CClF.sub.2 CHClF or mixtures of CF.sub.3 CHClF and CHF.sub.2 CClF.sub.2 with HF in the presence of a Cr.sub.2 O.sub.3 catalyst prepared by pyrolysis of ammonium dichromate, the reaction being conducted under controlled conditions whereby the production of CF.sub.3 CHF.sub.2 is maximized, and the formation of chloropentafluoroethane (CF.sub.3 CClF.sub.2) and other perhalo derivatives is minimized. The subject hydrogen-containing compound is useful as a blowing agent, propellant, refrigerant, fire extinguishing agent, or sterilant carrier gas.