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:
Oct. 03, 1978
Filed:
Mar. 16, 1978
Applicant:
Inventors:
Masaru Sano, Tokyo, JP;
Koji Kashima, Yokohama, JP;
Assignees:
Nittetu Chemical Engineering Ltd., Tokyo, JP;
Toa Oil Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
4235 / ; 423226 ; 4235 / ; 423571 ;
Abstract
An effluent alkali salt solution obtained in the desulfurization of a hydrogen sulfide-containing gas by washing with an alkali wash solution is subjected to a two stage precipitation treatment at different temperatures to recover valuable components such as a vanadium compound, chelating agent, ADA, and active alkali salts while removing inactive salts such as sulfate and thiosulfate.