Suppressing decomposition of alkaline solutions of salts of anth

Details Suppressing decomposition of alkaline solutions of salts of anth Suppressing decomposition of alkaline solutions of salts of anth

1981-04-22

1982-10-19

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423226, 423514, 423573G, B01D 5334

Patent

active

043550118

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 To overcome this drawback, the liquid product withdrawn from the combustion step is contacted with an oxygen-containing gas to convert alkali sulfides and/or alkali hydrogen sulfides contained therein to alkali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.

REFERENCES:
patent: 3904734 (1975-09-01), Gosden et al.
patent: 3966876 (1976-06-01), Singleton et al.
patent: 3972989 (1976-08-01), Fenton et al.
patent: 4098886 (1978-07-01), Nicklin et al.

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