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. 19, 1982
Filed:
Apr. 22, 1981
Gunter Weber, Linden, DE;
Linde Aktiengesellschaft, Wiesbaden, DE;
Abstract
In the scrubbing of gases containing sulfur compounds with an aqueous alkaline solution of salts of anthraquinonedisulfonic acid, alkali sulfates are formed during a salt regeneration step, and these sulfates must be kept under a certain upper limit. This is accomplished by subjecting a partial stream of scrubbing solution to combustion under reducing conditions; however, thiosulfate is also removed, resulting ultimately in the decomposition of the anthraquinonedisulfonates. To overcome this drawback, the liquid product withdrawn from the combustion step is contacted with an oxygen-containing gas to convert alkali sulfides and/or alkali hydrogen sulfides contained therein to alkali thiosulfate, preferably in the presence of a catalytic amount of said salts of anthraquinonedisulfonic acid.