Processing aqueous effluent liquors from degasification or gasification of coal
The aqueous effluent liquors from gasification or degasification of coal are extracted with a water-insoluble solvent and the extract is processed to recover the solvent. The aqueous residue is treated to remove nh3 in a driving-off column. The invention adds the steps of (A) removing part of the overhead product of the driving-off column as uncondensed vapors; (B) transferring the vapors from (A) to a scrubbing column, in steps condensing water, small amounts of ammonia and all acid gases in the upper part of said scrubbing column, and withdrawing pure ammonia overhead; (C) withdrawing the condensate which contains all acid gases from the upper portion of the scrubbing column, transferring the condensate to a separate reboiler, and heating the transferred condensate in said reboiler; (D) feeding cold water at a low rate to the top of the scrubbing column; (E) withdrawing the sump product of the scrubbing column, transferring it into a pressurized de-acidification column, and withdrawing therefrom overhead under pressure the acid gases h2s and co2; and (F) recycling to the stripping column the sump product of the pressurized de-acidification column consisting of a solution high in ammonia content.
- Assignee:
- Metallgesellschaft Ag (Germany, Federal Republic Of)
- Patent Number(s):
- US 4240808
- OSTI ID:
- 6799165
- Resource Relation:
- Patent Priority Date: Priority date 3 Oct 1977, German, Federal Republic of (F.R. Germany)
- Country of Publication:
- United States
- Language:
- English
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COAL GASIFICATION PLANTS
WASTE WATER
WASTE PROCESSING
AMMONIA
PHENOL
SOLVENT EXTRACTION
AROMATICS
EXTRACTION
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHENOLS
PROCESSING
SEPARATION PROCESSES
WASTE MANAGEMENT
WASTES
WATER
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