Hoechst Aktiengesellschaft

Egon Malow

Gunter Heck

Ulrich Girrbach

Edgar Hartl

Aladar Lienerth

Uwe Faust

Karl-Heinz Schwarz

Richard Grimm

Manfred Trautmann

Michael Ulrich

The invention provides a process for the selective absorption of chlorine and/or bromine from CO.sub.2 -containing off-gases. The off-gas must contain at least 1 mol of SO.sub.2 per mol of Cl.sub.2 and/or per mol of Br.sub.2 ; if necessary sufficient SO.sub.2 is added to the off-gas to give the above-mentioned relative amount. Chlorine and/or bromine is absorbed by mixing the off-gas with steam and then cooling the mixture until the steam condenses. An example of a suitable apparatus is a vertical tube having an internal cooling coil.

Process for the selective absorption of chlorine and/or bromine from

The invention provides a process for the selective absorption of chlorine from CO.sub.2 -containing off-gases, which comprises washing the off-gases with an aqueous solution which contains 0.1-10% by weight of NaHCO.sub.3 and 0.01-5% by weight of NaHSO.sub.3.

Process for the selective absorption of chlorine from CO.sub.2

A process for continuous rectification of a liquid mixture containing alcohols, particularly a liquid fermate, employs a plurality of distillation columns to which the liquid mixture is fed in parallel, and which have successively reduced operating pressures and temperatures from an initial one to a final one thereof. The top vapor distillate from the higher-pressure columns supplies driving heat to the sumps of the next successively lower-pressure columns. Direct steam at 130.degree. C. to 160.degree. C. is fed to the sump of the column operated at the highest pressure. Direct steam is generated by indirect heat exchange of water with the top vapor withdrawn from the columns, and the resulting direct steam is fed to the sumps of the next-lower-pressure columns. The apparatus can also include a section for the production of absolute alcohol.

Process for the continuous rectification of alcoholic fermates

Jet venturi apparatus for absorbing a gas by washing liquid provided with stack of packings extending across the throat.

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Hochheim, Germany

Egon Malow