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:
Mar. 04, 1997
Filed:
Dec. 16, 1991
Applicant:
Inventor:
William H Gumprecht, Wilmington, DE (US);
Assignee:
E. I. dupont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
570170 ;
Abstract
A process for the manufacture of a hydrochlorofluoropropane by halogen exchange using SbF.sub.5-y Cl.sub.y, where y=0 to 1, at 50.degree.-100.degree. C. to fluorinate a hydrochlorofluoropropane precursor characterized by the formula C.sub.3 HCl.sub.7-x F.sub.x, where x=2 to 5 and H is at a terminal carbon, wherein the degree of halogen exchange, p, and the number of moles, n, of SbF.sub.5-y Cl.sub.y per mole of precursor is such that (5-y)-(p/n) is at least 3. Such a process produces a more highly fluorinated hydrochlorofluoropropane substantially free of perhalogenated or carbon--carbon cleavage products.