Method of removing sulfur dioxide and nitrogen oxides from a gaseous stream
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United States of America Patent
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Jul 28, 1998
Issued Date -
N/A
app pub date -
Apr 19, 1996
filing date -
May 4, 1995
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Expired
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Abstract
A method for removing sulfur dioxide and nitrogen oxides from a gaseous stream using a magnesium-enhanced lime scrubbing slurry containing a ferrous chelate where oxidized ferrous chelate is regenerated by electrochemical treatment. The spent scrubbing solution containing ferric chelates is passed as a catholyte, at an acidic pH of 4.0-6.5 through a cathode compartment while an anolyte solution containing magnesium sulfate, at a pH of 1.5 to 6.5 is passed through an anode compartment, the compartments separated by a microporous separator. An electrical current is passed from the cathode compartment to the anode compartment and ferric chelates are regenerated to ferrous chelates.
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