Hoechst Aktiengesellschaft

Engelbert Krempl

Herbert Stuhler

Heinz Muller

Horst Streitberger

Julius Strauss

Ulrich Schwenk

Herbert Hubner

Inge Konig

A process for the purification of esters, which contain residues of dissolved and/or undissolved alcohols, is described. The purification of the esters containing alcohols is achieved by treating the esters, in the liquid state, with an effective amount of water-soluble polysaccharide derivatives in the solid state.

Process for the purification of esters

2-(perfluoroalkyl)-ethanols of the formula R.sub.f CH.sub.2 CH.sub.2 OH are obtained from 2-(perfluoroalkyl)-ethyl iodides of the formula R.sub.f CH.sub.2 CH.sub.2 I as a mixture with 2-(perfluoroalkyl)-ethylenes of the formula R.sub.f CH.dbd.CH.sub.2 and possibly also with 2-(perfluoroalkyl)-ethylcarboxylic acid esters of the formula R.sub.f CH.sub.2 CH.sub.2 OCOR. From these mixtures, the 2-(perfluoroalkyl)-ethanols are obtained with a high purity degree when adding during the distillation separation as entrainer an alkanol having from 1 to 8 carbon atoms or a monoalkyl ether of ethyleneglycol the alkyl radical of which contains 1 to 4 carbon atoms, or a mixture of such alkanols and/or alkylglycols, and in the presence of 2-(perfluoroalkyl)-ethylcarboxylic acid esters, furthermore an acidic ester interchange catalyst.

Process for obtaining pure 2-(perfluoroalkyl)-ethanols from their

A process for the preparation of tertiary aliphatic amines containing an alkyl or alkenyl radical having 8 to 24 carbon atoms and at least one methyl group by reacting a liquid alcohol or aldehyde having 8 to 24 carbon atoms in the presence of a copper-chromium oxide catalyst with a gaseous mixture containing hydrogen and a lower primary or secondary alkyl amine having at least one methyl group, the amine proportion of the gas mixture being in the range of from 1 to 20% by volume, eliminating the water having been formed in the reaction from the gaseous mixture, and recirculating the gaseous mixture continuously back into the liquid alcohol or aldehyde.

Process for the preparation of tertiary aliphatic amines

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Burgkirchen, Germany

Engelbert Krempl