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. 03, 1992
Filed:
Nov. 20, 1990
Applicant:
Inventors:
Yukihiro Yoshikawa, Chiba, JP;
Tooru Hihara, Fukuoka, JP;
Kunihiro Yamada, Fukuoka, JP;
Shinji Takenaka, Fukuoka, JP;
Kazunori Kawahara, Yamaguchi, JP;
Jun Kitagawa, Yamaguchi, JP;
Assignee:
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ; C01B / ;
U.S. Cl.
CPC ...
502 25 ; 423502 ; 423507 ; 502 26 ; 502 27 ;
Abstract
The catalytic activity of a chromium oxide-based catalyst used in the production of chlorine by oxidation of hydrogen chloride gas with an oxygen-containing gas is regenerated by impregnating it with an aqueous solution of chromic acid anhydride or of a chromium salt and then calcining the catalyst at a temperature not higher than 800.degree. C.