Electrodialytic water splitting process for removing SO.sub.2 from gases
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United States of America Patent
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Jan 25, 1994
Grant Date -
N/A
app pub date -
Oct 15, 1992
filing date -
Oct 15, 1992
priority date (Note) -
Expired
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Abstract
The present invention comprises an improved electrodialytic cell and closed loop process for removing SO.sub.2 from SO.sub.2 containing gases. An aqueous scrubbing medium is used to remove the SO.sub.2 from the gas. A two compartment electrodialytic water splitter and a means for stripping is used to isolate the SO.sub.2 and regenerate the aqueous scrubbing medium. Use of univalent cation selective membranes, recycling of the acid product to the base loop of the water splitter, and a prescrubber allow high concentrations of scrubbing solution to be treated without significant fouling inside the membranes. The above process embodiments may be used either alone or in combination.
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