Removing phenols from waste water

Details Removing phenols from waste water Removing phenols from waste water

1977-09-30

1979-07-31

Spitzer, Robert H.

Gas separation

Means within gas stream for conducting concentrate to collector

55 70, 55 73, 208263, 210 21, 568759, B01D 1900, B01D 5314

Patent

active

041629027

ABSTRACT:
A process for removing phenols from waste water resulting from the gasification or carbonization of coal and containing CO.sub.2, H.sub.2 S and NH.sub.3, comprising mixing the waste water with a low-boiling organic solvent, separating the mixture into a solvent layer and an aqueous layer, stripping off from the aqueous layer under superatmospheric pressure the vapors of CO.sub.2, H.sub.2 S and organic solvent contained therein, then stripping off from the aqueous layer the NH.sub.3 contained therein leaving a refined aqueous product layer suitable for discharge, scrubbing the stripped vapors under superatmospheric pressure with a portion of the cold refined product to remove organic solvent contained therein, condensing part of the solvent and separating it under superatmospheric pressure, and scrubbing the remaining acid gases still containing ammonia and solvent with recirculated cooled raw phenol to remove the ammonia and solvent.

REFERENCES:
patent: 1856690 (1932-05-01), Carswell
patent: 2675412 (1954-04-01), Herbert et al.
patent: 2927075 (1960-03-01), Brown
patent: 3335071 (1967-08-01), Bollen et al.
patent: 3915674 (1975-10-01), Smith
patent: 3972693 (1976-08-01), Wiesner et al.

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