Bayer Aktiengesellschaft

Raimund Wambach

Adolf Wissner

Sigurd Hartung

Lothar Puppe

Gerd-Michael Petruck

Gerhard Reiss

Kurt Klinkmann

Feliks Bitners

Werner Hauser

A process for the preparation of a trichlorobenzene by chlorination of o-dichlorobenzene in the presence of a catalyst is disclosed. The catalyst comprises aluminum chloride. Preferably an iron or iron chloride containing aluminum chloride catalyst is employed.

Process for the preparation of trichlorobenzenes

A process for separating ortho-, meta-, and/or para-dichlorobenzene from an isomeric mixture thereof which comprises:

Process for the preparation of dichlorobenzenes

The invention is directed to a process for the purification of aqueous solutions of low molecular weight polyhydroxyl compounds containing calcium or lead compounds or mixtures thereof. Methanol and a precipitant for calcium and/or lead ions in a quantity equivalent to the ions to be removed are added to the solutions. The deposits thus formed are removed and the residual solutions are treated with a cation exchanger followed by distillation of the low-boiling fractions. The distillation sump which essentially contains the low molecular weight polyhydroxyl compounds is then treated with an anion exchanger.

Process for the purification of aqueous solutions of low molecular

A process for the separation of isomeric dichlorotoluenes is described wherein an isomeric mixture of dichlorotoluenes is passed over a zeolite of the X or Y type, non-adsorbed dichlorotoluene is separated off and the adsorbed dichlorotoluene is eluted from the zeolite by contacting the same with an eluant.

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Leverkusen, Germany

Raimund Wambach