Bayer Aktiengesellschaft

Werner Schulte-Huermann

Erhard Schellmann

Heinz-Peter Hemmerich

Jurgen Lahrs

Heinz P Hemmerich

Heinz Dohm

A process for the purification of crude benzoic acid obtained by the catalytic oxidation of toluene in the liquid phase, which is contaminated with impurities including phthalic acid and benzylbenzoate, the process involves distilling the crude benzoic acid in a first distillation in the presence of an aliphatic amine or a mixture of aliphatic amines of the formula

Process for the purification of benzoic acid by distillation with an

o-Benzylphenol is prepared by reacting phenol with dibenzyl ether in the presence of .gamma.-aluminum oxide as a condensation agent. o-Benzylphenol is used, inter alia, as such or, after chlorination, in the form of chlorobenzylphenols, as a microbicidal agent.

Process for the preparation of o-benzylphenol

In a process for the preparation of an N-alkylated aromatic amine by contacting an aromatic amine with an aliphatic or cycloaliphatic alcohol at an elevated temperature and under increased pressure, in the presence of catalysts, the improvement wherein the reaction is carried out in the presence of a phosphorus oxyhalide.

Process for the preparation of N-alkylated aromatic amines

In a process for the continuous preparation of chloroformic acid methyl ester by contacting phosgene with methanol at a temperature of up to 50.degree. C. in a reactor which contains chloroformic acid methyl ester as the solvent and in which phosgene is dispersed, the improvement wherein gaseous phosgene is dispersed by already formed and circulated chloroformic acid methyl ester into the reaction chamber by means of a dispersing device, and at the same time methanol is introduced into the homogeneous gas-in-liquid dispersion.

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Krefeld, Germany

Werner Schulte-Huermann