Processing aqueous effluent liquors from degasification or gasification of coal

Patent · Tue Dec 23 04:00:00 EST 1980

OSTI ID:6799165

Garber, A; Schmidt, A; Stonner, H M; Wiesner, P; Wohler, F

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
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
010800* -- Coal
Lignite
& Peat-- Waste Management
AMMONIA
AROMATICS
COAL GASIFICATION PLANTS
EXTRACTION
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
LIQUID WASTES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHENOL
PHENOLS
PROCESSING
SEPARATION PROCESSES
SOLVENT EXTRACTION
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER