Process for removing contaminants from hot waste gas streams

Details Process for removing contaminants from hot waste gas streams Process for removing contaminants from hot waste gas streams

B - Operations, Transporting

01

D

23/349

B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01C 1/22 (2006.01)

Patent

CA 1053878

PROCESS FOR REMOVING CONTAMINANTS FROM HOT WASTE GAS STREAMS Abstract of the Disclosure A process for removing sulfur dioxide and other con- taminants from a hot waste gas stream in which the waste gas stream is cooled to a temperature below 100°F and then passed in sequence through two separate absorption zones utilizing as the absorbent a recirculated aqueous solution of ammonium sulfite-bisulfite salts. Heat is continuously withdrawn from the recirculated salt solution in each zone. The absorbent solution in the first zone has an initial pH of from 6 to 7.2 and a salt concentration of from 1 to 20% by weight. The absorbent solution in the second zone has an initial pH of from 5.2 to 6.5 and a salt concentration, lower than said first zone of, from 0.1 to 5% by weight. The process provides for the efficient absorption and substantial removal of SO2, SO3 and particulate contaminants and for the economic recovery and use of heat from stack gases of a variety of industrial and commercial operations.

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