Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1977-10-03
1980-07-08
Vertiz, O. R.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
423243, 423242, C01B 1748, C01B 1700
Patent
active
042117615
ABSTRACT:
A process for removing sulfur dioxide from a mixture of gases and converting the removed SO.sub.2 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 salt of a weak acid which has an ionization constant (pKa) value of at least 3.5. The pregnant scrubbing solution is then contacted with an organic transfer reactant which is a water immiscible, water insoluble amine salt to effect a transfer reaction by which the sulfite ions are transferred to the non-aqueous phase by way of an ion exchange reaction. The sulfur bearing, non-aqueous phase is next heated to decompose the sulfite, releasing sulfur dioxide and a water immiscible, water insoluble amine-bearing compound. The amine-bearing compound is next contacted with the alkali metal salt scrubbing solution from the transfer step. After this contact, the regenerated aqueous scrubbing solution is recycled to the scrubber, and the rengenerated organic solution is recycled to ion exchange with additional pregnant scrubbing solution.
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Laney William R.
Straub Gary P.
Vertiz O. R.
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