Huels Aktiengesellschaft

Jurgen Grutzke

Stefan Schmidt

The application relates to a novel process for bleaching alkyl polyglycosides having C.sub.8 - to C.sub.20 -alkyl groups in aqueous solution using peroxy compounds. The bleaching is carried out in a tubular reactor.

Process for bleaching alkyl polyglycosides

In a process for preparing alkyl glycosides having C.sub.8 to C.sub.20 alkyl radicals by glycosidation and transglycosidation or by direct glycosidation, a saccharide syrup having a dextrose equivalent of 90 to 95 is used as starting material. Products having a very low mean degree of glycosidation are achieved by filtering off oligosaccharide during the reaction and/or afterwards.

Process for preparing alkyl glycosides having a low degree of

The preparation of alkyl oligoglycosides by transglycosidation of C.sub.2 to C.sub.6 alkyl glycosides using C.sub.8 to C.sub.20 fatty alcohols is improved by the fact that the fatty alcohol is preheated to at least 80.degree. C., it is mixed with the alkyl glycoside, then the reaction is performed and C.sub.2 to C.sub.6 alcohol is flashed off under vacuum after the reaction. Products having a good color are obtained. Encrustation and cracking in the equipment do not occur.

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Bochum, Germany

Jurgen Grutzke