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:
Jul. 13, 1993
Filed:
Jul. 17, 1992
Applicant:
Inventors:
John D Scott, Cheshire, GB;
Pravin K Dattani, Cheshire, GB;
Assignee:
Imperial Chemical Industries PLC, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ; B01J / ; C07C / ;
U.S. Cl.
CPC ...
502 36 ; 502 37 ; 570168 ; 570169 ;
Abstract
A method for regenerating a used fluorination catalyst such as a chromium-containing compound comprises contacting the used catalyst at a temperature of 300.degree. C. to 500.degree. C. with a mixture of an oxidizing agent, especially air, and hydrogen fluoride and optionally an inert diluent such as nitrogen, said mixture containing up to 30% of oxidizing agent on a molar basis. The method obviates chromium loss during regeneration/refluorination of spent catalyst and provides heated hydrogen fluoride for use directly in fluorination reactions.