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:
Feb. 10, 1998
Filed:
Jun. 02, 1997
Applicant:
Inventors:
Assignee:
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ;
U.S. Cl.
CPC ...
502 24 ; 502 22 ; 502 27 ; 502 33 ;
Abstract
A simple and excellent process for the regeneration of heteropolyacid catalysts can be provided. A heteropolyacid catalyst, e.g. a phosphomolybdic acid catalyst, whose activity has been lowered can be regenerated by dissolving and/or suspending it in an aqueous medium and then treating with an inorganic ion-exchange material, e.g. crystalline antimonic acid.