Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1998-08-06
2000-05-23
Griffin, Steven P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423547, B01D 5350, C02C 124
Patent
active
060663049
ABSTRACT:
A process is provided for scrubbing sulfur dioxide out of a flue gas by contacting the flue gas with a scrubbing liquid containing diammonium phosphate and ammonium sulfite and in which the total concentration of phosphates is maintained in a balance with the total concentration of sulfites so that the formation and release of plumes of ammonium sulfite are minimized. The sulfur dioxide in the flue gas reacts with the diammonium phosphate to produce monoammonium phosphate and ammonium bisulfite. A portion of the scrubbing liquid is contacted with ammonium ions to convert the monoammonium phosphate into diammonium phosphate and the ammonium bisulfite into ammonium sulfite, and the same portion of scrubbing liquid is contacted with oxygen to convert the ammonium ammonium sulfite into ammonium sulfate. Ammonium sulfate is removed from the process and the oxidized scrubbing liquid is recycled for further contact with flue gas.
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Freetly Mark
Heeney John M.
Griffin Steven P.
Pircon Delores
Vanoy Timothy C
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