Process for the removal of oxides of sulfur from a gaseous...

Details Process for the removal of oxides of sulfur from a gaseous... Process for the removal of oxides of sulfur from a gaseous...

B - Operations, Transporting

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B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01F 5/42 (2006.01) C01F 11/46 (2006.01) C01F 11/48 (2006.01)

Patent

CA 1048231

Abstract The removal of oxides of sulfur from gaseous streams is increased by the addition of magnesium oxide or magnesium hydroxide to a calcium hydroxide scrubbing liquor in an amount sufficient to provide magnesium ions in the liquor, upon intro- duction to a scrubbing unit, of between 250 and 5000 parts per million. The controlled amount of magnesium ions results in a higher alkalinity of the scrubber liquor and, in addition to increasing the sulfur removal from the gaseous stream, reduces the formation of calcium salt scaling within the system. The pH of the liquor, prior to introduction into the scrubber, is adjusted to a pH of between 5.5 and 10.09 preferably by the addition of predetermined amounts of calcium hydroxide and magnesium hydroxide thereto.

199044

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