Scrubbing of hydrogen sulphide using pH control to control thios

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component

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423224, 423573R, B01D 5334, C01B 1705

Patent

active

044341466

ABSTRACT:
In a process wherein hydrogen sulphide is removed from a gaseous mixture by scrubbing with an aqueous alkaline scrubbing solution containing an oxidizing agent, which process ordinarily results in a buildup of S.sub.2 O.sub.3.sup.-- ion, in order to reduce the rate of formation of S.sub.2 O.sub.3.sup.-- ions, the pH of the alkaline scrubbing solution is maintained at below 9 preferably at 8.0-8.5, with CO.sub.2 being preferably employed as the pH adjusting reagent.

REFERENCES:
patent: 4113553 (1978-09-01), Samuelson
patent: 4243648 (1981-01-01), Fenton
Mackinger et al., "Sulfint Process", Hydrocarbon Processing, Mar. 1982, pp. 169-172.
Kohl et al., "Gas Purification", 3rd Ed., 1979, Gulf Publishing Company, Houston, pp. 476-482.

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