Magnesium-enhanced lime scrubbing of sulfur dioxide with...

Details Magnesium-enhanced lime scrubbing of sulfur dioxide with... Magnesium-enhanced lime scrubbing of sulfur dioxide with...

B - Operations, Transporting

01

D

B01D 53/34 (2006.01) B01D 53/14 (2006.01) B01D 53/50 (2006.01)

Patent

CA 2117731

Sulfur dioxide is removed from a gaseous stream using an aqueous scrubbing medium containing calcium components and magnesium ions, so as to produce a more readily dewatered aqueous calcium sulfite-containing sludge by providing in the aqueous scrubbing medium in an aqueous scrubbing unit an effective amount of at least one amine sulfonate ion of the formula: Image where R is H or OH, and R' is H or SO3, with R and R' not both being H. The amine sulfonate ion is preferably provided by adding an amine disulfonate salt having the formula HN(SO3X)2 or a hydroxylamine monosulfonate salt having the formula HO-NH-(SO3X), when X is an alkali or alkaline earth metal. Or an effluent stream from a scrubbing unit for nitrogen oxides containing a metal chelate and an amine sulfonate may be added to provide the amine sulfonate ion.

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