Reduction of sulfur concentration in physical scrubbing agents

Details Reduction of sulfur concentration in physical scrubbing agents Reduction of sulfur concentration in physical scrubbing agents

1977-01-28

1979-05-22

Vertiz, O. R.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Carbon containing

55 68, 55 73, 423243, 423575, C01B 2154, C01B 1700, C01B 1702

Patent

active

041559886

ABSTRACT:
In a low temperature gas scrubbing process with a physical scrubbing solution, e.g., methanol, wherein either the H.sub.2 S containing gas-to-be-scrubbed, e.g., coal gasification gas, has a sufficient concentration of SO SO.sub.2 and/or O.sub.2 or wherein the H.sub.2 S containing scrubbing solution is brought into contact with a second O.sub.2 and/or SO.sub.2 containing gas, e.g. a stripping gas, to form elemental sulfur in the scrubbing solution, and said scrubbing solution is regenerated and then cooled to the scrubbing temperature, the improvement which comprises adding a sufficient amount of cyanides to the scrubbing solution to convert the elemental sulfur to thiocyanate, whereby sulfur is not precipitated in the scrubbing solution which would have otherwise occured, and removing the thiocyanate at least partially from the scrubbing solution. The cyanides may be added to the gas-to-be-scrubbed or the scrubbing solution, or there may be sufficient hydrocyanic acid in the gas-to-be-scrubbed at the outset.

REFERENCES:
patent: 3318666 (1967-05-01), Every et al.
patent: 3904734 (1975-12-01), Gosden et al.
patent: 3937795 (1976-02-01), Hasebe
patent: 3956460 (1976-05-01), Brocoff
patent: 3965243 (1976-06-01), Krochat
patent: 4017594 (1977-04-01), Fenton et al.

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