Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1976-09-30
1978-07-18
Peters, G. O.
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
C01B 1704
Patent
active
041016432
ABSTRACT:
A process for removing sulfur dioxide from a mixture of gases and converting the removed sulfur dioxide to elemental sulfur. The sulfur dioxide is first contacted in a scrubbing zone with a scrubbing agent which is an aqueous solution of an alkali metal sulfite. The pregnant scrubbing solution is then contacted with an organic transfer reactant which is a water-immiscible long chain aliphatic amine to effect a transfer reaction in which the amine combines with sulfite ions to form organic amine sulfite, and regenerate the alkali metal sulfite scrubbing agent. In the final step of the process, the long chain aliphatic amine sulfite is heated to decompose the sulfite, releasing sulfur dioxide and regenerating the amine. The regenerated amine, as well as the regenerated alkali metal sulfite scrubbing agent, are recycled in the process, and the sulfur dioxide product can be optionally further reduced to elemental sulfur.
REFERENCES:
patent: 1946489 (1934-02-01), DeJahn
patent: 2128027 (1938-08-01), Clark
patent: 3633339 (1972-01-01), Wiewiorowski
patent: 3962405 (1976-06-01), Annesser et al.
patent: 3984529 (1976-10-01), Tung
patent: 3989796 (1976-11-01), Morita et al.
Laney William R.
Peters G. O.
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