Regeneration and use of SO.sub.2 gas scrubber liquid in dual alkali system
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United States of America Patent
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Apr 26, 1988
Grant Date -
N/A
app pub date -
Jan 5, 1987
filing date -
Jan 5, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
High efficiency scrubbing of SO.sub.2 from stack gases by contact with a sodium based liquor is achieved by adjusting the pH of the scrubber liquor supplied to be in the range of 7.00 to 8.00; and a source of such liquor in a dual alkali system is disclosed in which a mixture of slaked lime and limestone is reacted with spent liquor in two stages one of which is at pH above 8.00, the other of which is at a pH below about 6.8 and the pH of the resulting regenerated liquor is adjusted to the desired pH range.
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