Method for removing the sulphur content of a weak gas containing

Details Method for removing the sulphur content of a weak gas containing Method for removing the sulphur content of a weak gas containing

1987-10-06

1989-08-29

Doll, John

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

210761, 423222, 423551, 423242, 423571, 423574L, C01B 1705

Patent

active

048615773

ABSTRACT:
The invention relates to a method for cleaning exhaust gases weak in sulphur dioxide, or sulphur dioxide and hydrogen sulphide. In order to remove the sulphur content of an exhaust gas, the exhaust gas is absorbed into a solution containing sulphide. Thereafter into the solution is added an agent which causes any unstable compounds of sulphur and oxygen, such as thiosulphate and polythionates, which are formed in the scrubbing solution, to decompose into elemental sulphur and sulphate in the autoclave whereinto the scrubbing solution is fed. The pH of the solution emerging from the autoclave is adjusted to stay within the range 2.0-2.9.

REFERENCES:
patent: 3761409 (1973-09-01), McCoy et al.
patent: 3784680 (1974-01-01), Strong et al.
patent: 3932584 (1976-01-01), Asakusa et al.
patent: 3959452 (1976-05-01), Espenscheid et al.
patent: 4083944 (1978-04-01), Chalmers
patent: 4208395 (1980-06-01), Gorin
patent: 4360508 (1982-11-01), Farrington et al.

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