Composition and method for treating flue gas and methanol containing effluents
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
- Resource Relation:
- Patent Priority Date: Priority date 8 Jul 1982, Canada; Other Information: PAT-APPL-396442
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUE GAS
AIR POLLUTION CONTROL
CATALYSIS
DEHYDROGENATION
SCRUBBING
WASTE HEAT UTILIZATION
HYDROGEN SULFIDES
ABSORPTION
REMOVAL
METHANOL
AQUEOUS SOLUTIONS
CHROMIUM CHLORIDES
COBALT CHLORIDES
IRON CHLORIDES
NICKEL CHLORIDES
SODIUM HYDROXIDES
ALCOHOLS
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM COMPOUNDS
COBALT COMPOUNDS
CONTROL
DISPERSIONS
GASEOUS WASTES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
IRON COMPOUNDS
MIXTURES
NICKEL COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
SODIUM COMPOUNDS
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE PRODUCT UTILIZATION
WASTES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)