Process for removing hydrogen sulfide from gases particularly coal pyrolysis gases
Hydrogen sulfide is first removed by ammoniacal liquor from coke oven gas in the bottom part of a gas scrubber. In the top part of the scrubber, two consecutively-arranged fine scrubbing stages remove hydrogen sulfide by treating the gases, in the upper stage, with a caustic soda solution or a caustic potash solution. Beneath the upper scrubbing stage is the second fine scrubbing stage fed with a subflow of an aqueous carbonate solution collecting at the outlet of the upper fine scrubbing stage and a subflow of cooled, regenerated carbonate solution discharged from the hydrogen-sulfide/hydrogen-cyanide stripper. From the hydrogen-sulfide/hydrogen-cyanide stripper, a second subflow is admixed with coal liquor for removing fixed ammonia therefrom in a separator. The separator produces water vapor with carbon dioxide vapors that are delivered to the hydrogen-sulfide/hydrogen-cyanide stripper for regenerating the aqueous carbonate washing solution.
- Assignee:
- Dr.C. otto and Comp. GmbH (Germany, Federal Republic of)
- Patent Number(s):
- US 4499060
- OSTI ID:
- 5465897
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010401* -- Coal & Coal Products-- Carbonization-- (-1987)
010500 -- Coal
Lignite
& Peat-- Products & By-Products
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GAS
COKE OVENS
CONTROL
CYANIDES
DESIGN
DESULFURIZATION
EQUIPMENT
FLUIDS
GASES
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INORGANIC ACIDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REMOVAL
SCRUBBERS
SCRUBBING
SEPARATION EQUIPMENT
SODIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS