Regeneration of sulfur dioxide scrubber liquor

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component

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Details

423512A, 423519, C01B 1700, C01B 1745, C01B 1762

Patent

active

044629699

ABSTRACT:
A process of regeneration of scrubber bleed liquor discharged from SO.sub.2 gas scrubber in which there are provided two serially connected sludge blankets containing 15-40% finely divided solids in liquor overlain by a relatively clear supernatant liquor. The bleed liquor is introduced into the first blanket along with an aqueous slurry of ground limestone, liquor and limestone partially react in the first blanket then they are transferred to the second blanket for further reaction, after which the liquor is recycled to the scrubber and a proportional amount of reacted limestone is wasted. The liquor has a relatively short residence time in the system on the order of 30-180 minutes while solids residence in the system is on the order of 6 to 24 hours. A special embodiment is provided for use when the first sludge blanket is in a relatively small tank in which only a portion of the bleed liquor is supplied to the first sludge blanket and the balance is injected directly into the second sludge blanket.

REFERENCES:
patent: 3989797 (1976-11-01), Brady et al.
patent: 4331640 (1982-05-01), Morita et al.
patent: 4379130 (1983-04-01), Brady
patent: 4388282 (1983-06-01), Chou et al.
patent: 4410500 (1983-10-01), Wang et al.
patent: 4411875 (1983-10-01), Butler et al.

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