Process for desulfurization of sulfur dioxide-containing gas streams
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United States of America Patent
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Aug 13, 1991
Grant Date -
N/A
app pub date -
Apr 29, 1988
filing date -
Apr 29, 1988
priority date (Note) -
Expired
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Abstract
A process for desulfurizing sulfur dioxide-containing gases wherein the sulfur-containing gases are contacted with an aqueous solution of magnesium hydroxide in a wet scrubber, wherein magnesium sulfite and magnesium bisulfite are formed, a portion of spent scrubbing medium is subjected to oxidation to convert the magnesium sulfite and the magnesium bisulfite therein to magnesium sulfate, the oxidized product is contacted with a magnesium-containing lime slurry to obtain magnesium hydroxide and calcium sulfate, calcium sulfate is separated from the resulting product and the magnesium hydroxide is recycled to the scrubber.
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