Dow Global Technolgoies LLC

Wolff Walsrode Ag

Volker Eckhardt

Gunter Weber

Hartwig Schlesiger

Gerd Sonnenberg

Martin Morning

Holger Tanneberger

Bernd Schriewer

Martin Lohrie

René Kiesewetter

A process is described for the continuous preparation and/or workup of polysaccharide derivatives by reaction and/or conditioning in a suspension with liquid reaction partners, in which, in accordance with,

Continuous process for the production and/or workup of polysaccharide derivatives

The present invention relates to a new, particularly economical process for preparing particulate water-soluble cellulose derivatives. The process involves forming a feed composition of swollen and/or dissolved cellulose derivative, and water. The feed composition is contacted with a superheated gas mixture, in a sieve-free high rotational speed gas jet impact mill, and the cellulose derivative of the feed composition is converted into a solid state form of finely particulate particles. The superheated gas mixture, with which the feed composition is contacted, is selected from: (i) a superheated gaseous mixture of steam and an inert gas; and (ii) a superheated gas mixture of steam and air. The superheated gas mixture has a steam content of 40 wt. % to 99 wt. %, based on the total weight of the superheated gas mixture.

Process for producing particulate, water-soluble cellulose derivatives using a superheated gas mixture containing steam

Growing community of inventors

Walsrode, Germany

Volker Eckhardt