Flue gas desulfurization process utilizing hydrogen peroxide
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United States of America Patent
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Aug 16, 2011
Grant Date -
Oct 30, 2008
app pub date -
Apr 29, 2008
filing date -
Apr 30, 2007
priority date (Note) -
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Abstract
-containing flue gas stream is contacted with a recirculating stream of an aqueous medium containing concentrated sulfuric acid and hydrogen peroxide, to yield a desulfurized flue gas stream and to produce additional sulfuric acid in the aqueous medium. A portion of the recirculating aqueous sulfuric acid stream is diverted for recovery of the additional sulfuric acid as gypsum in a neutralization step, and the process parameters are adjusted so that the heat of reaction generated during the neutralization step is sufficient to evaporate the free water that is present and yield a gypsum product that is substantially dry.
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