Central Illinois Public Service Company

Robert S Butler

James H Wilhelm

Paul F Claerbout

Randy S Cleland

Richard E Micko

Jerry L Simpson

Louis P Kent

Steven J Harvey

High efficiency scrubbing of SO.sub.2 from stack gases by contact with a sodium based liquor is achieved by adjusting the pH of the scrubber liquor supplied to be in the range of 7.00 to 8.00; and a source of such liquor in a dual alkali system is disclosed in which a mixture of slaked lime and limestone is reacted with spent liquor in two stages one of which is at pH above 8.00, the other of which is at a pH below about 6.8 and the pH of the resulting regenerated liquor is adjusted to the desired pH range.

Regeneration and use of SO.sub.2 gas scrubber liquid in dual alkali

A dual alkali process and an apparatus for the removal of sulfur oxides from a gas stream containing such sulfur oxides, is disclosed.

Dual alkali process for combustion gas cleaning

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Effingham, IL, United States of America

Robert S Butler