Metallgesellschaft Aktiengesellschaft

Helmut Fellner

Gunter Pockrandt

A process of treating an aqueous liquor which has been used to scrub a hot raw gas produced by the gasification of a solid, liquid or gaseous fuel, which liquor has dissolved therein gaseous pollutant, comprising flashing said liquor from a temperature of at least 100.degree. C and a pressure of at least about 5 bars in at least on preliminary flashing stage to an intermediate pressure in the range of about 1.1 to 4 bars, separating the flashed-off gases containing the bulk of the pollutants from the residual aqueous liquor, and then flashing off the residual liquor to atmospheric pressure. The pollutant gas may contain H.sub.2 S and the gas product of the preliminary flashing can be fed to a Claus process for removing sulfur compounds.

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Frankfurt am Main, Germany

Helmut Fellner