Lenzing Aktiengesellschaft

Johann M&auml;nner

Heinrich Firgo

Wilhelm Feilmair

Johannes Kneissl

Christian Hager

Rudolf Emeder

Franz Nussbaumer

Thomas Endl

The invention relates to a process for the production of cellulosic fibers from solutions of cellulose in an aqueous tertiary amine oxide whereby the extruded fibers are led through a precipitating bath and cut and the cut fibers are passed through a series of water baths in the form of a fleece and then dried, whereby the wash baths are connected to each other and fresh washing liquor is applied to the last wash bath and led in countercurrent with the transportation direction of the fibre fleece to the first wash bath. The process in accordance with the invention is characterised in that the pH value of each of these wash baths is maintained higher than 8.5.

Process for the production of cellulosic fibres

The invention relates to a process for the reprocessing respectively purification of aqueous solutions of a tertiary amine oxide, particularly of process waters, e.g. used precipitation baths, which occur during the production of cellulosic moulded bodies, comprising the separation of turbidifying agents and solid impurities from the solution. The process in accordance with the invention is characterised in that the turbidifying agents and impurities are at least partly separated by means of a flotation process.

Method for preparing or purifying aqueous solutions of a tertiary amino-oxide

Growing community of inventors

Weyregg, Austria

Johann Männer

Growing community of inventors

Weyregg, Austria

Johann M&auml;nner

Johann Männer