Title:
METHOD OF TREATING ALKALI AQUEOUS SOLUTION OF SALT OF ANTHRAQUINONE DISULFONIC ACID
Document Type and Number:
Japanese Patent JPS5724620
Kind Code:
A
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 To overcome this drawback, the liquid product withdrawn from the combustion step is contacted with an oxygen-containing gas to convert alkali sulfides and/or alkali hydrogen sulfides contained therein to alkali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.
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Inventors:
GIYUNTAA BUEEBAA
Application Number:
JP6070981A
Publication Date:
February 09, 1982
Filing Date:
April 23, 1981
Export Citation:
Assignee:
LINDE AG
International Classes:
B01D53/14; B01D53/34; B01D53/52; B01D53/77; C01B17/05; C10K1/12; (IPC1-7): B01D53/34