Removal of sulfur from waste gas streams

Details Removal of sulfur from waste gas streams Removal of sulfur from waste gas streams

B - Operations, Transporting

01

D

252/30, 23/350

B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01B 17/60 (2006.01)

Patent

CA 1151848

ABSTRACT OF THE DISCLOSURE Preferential sulfur dioxide absorption solvents may be buffered with suitable agents, such as alkanolaminium carboxylates, to substantially retard or eliminate the tendency of such solvents to degrade or accumulate non- regenerable salts, particularly sulfates, when loaded with absorbed sulfur dioxide. A method for employing the buffer as an immiscible aqueous phase as a separate trimming solvent to selectively abso? residual sulfur dioxide from a gas stream from which the bulk amount of sulfur dioxide is first removed by contact with a trialkyl phosphate solvent is disclosed. The method permits the trialkyl phosphate solvent to be regenerated and purged of salts at lower energy requirements.

390713

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