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Composition and method for treating flue gas and methanol containing effluents

Patent ·
OSTI ID:5484490
A composition is provided which comprises an aqueous alkaline solution of a metal salt and black liquor, the metal salt being selected from the group consisting of iron, chromium, cobalt and nickel salts. This composition is useful in a process described for absorption of hydrogen sulfide from flue gas, followed by subsequent oxidation of dissolved sulfide to thiosulfate, if desired. The presence of the metal ions and black liquor synergistically catalyzes the overall reaction of absorption of hydrogen sulfide, followed by oxidation of the sulfide. Preferably, prior to scrubbing to remove hydrogen sulfide with the solution, the flue gas is first cooled to near its dew point, and then scrubbed with water to remove particulates. Additionally, the effluent flue gas from the absorption step is usefully scrubbed with water to recover heat, following which it is used to scrub condensates from a kraft pulp mill. The metal salt in the solution is preferably an iron salt at a concentration of about 0.002 M., the black liquor concentration being preferably about 1% to 5% by volume of the solution, and the pH being usefully about 9.0 to 9.5.
Assignee:
Wescam Services Inc. (Canada)
Patent Number(s):
US 4505776
OSTI ID:
5484490
Country of Publication:
United States
Language:
English

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Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION
AIR POLLUTION CONTROL
ALCOHOLS
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM CHLORIDES
CHROMIUM COMPOUNDS
COBALT CHLORIDES
COBALT COMPOUNDS
CONTROL
DEHYDROGENATION
DISPERSIONS
FLUE GAS
GASEOUS WASTES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROXIDES
HYDROXY COMPOUNDS
IRON CHLORIDES
IRON COMPOUNDS
METHANOL
MIXTURES
NICKEL CHLORIDES
NICKEL COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
REMOVAL
SCRUBBING
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION
WASTES