Method and device for the continuous, single-step production...

Details Method and device for the continuous, single-step production... Method and device for the continuous, single-step production...

C - Chemistry, Metallurgy

08

J

C08J 3/09 (2006.01) C08J 3/11 (2006.01) C08K 5/357 (2006.01) C08L 1/02 (2006.01) D01D 1/02 (2006.01) D01F 2/00 (2006.01)

Patent

CA 2427478

The invention relates to a method and to a device for the continuous, single- step production of a homogeneous solution of cellulose in hydrous aminoxides on the basis of cellulose and aqueous aminoxides, preferably N- methylmorpholino-N-oxide (NMMO), at temperatures in the range of from 50 to 130 ~C under a vacuum and water evaporation. The cellulose and the NMMO are dosed separately to the device, mixed while sheared, the water is evaporated until the mixture is dissolved, the solution is homogenized and directly fed to the consumer via screw conveyors, pumps and filters.

L'invention concerne un procédé et un dispositif pour la production en continu, en une seule étape, d'une solution homogène de cellulose dans des oxydes d'amines tertiaires contenant de l'eau, à partir de cellulose et d'oxydes d'amines renfermant de l'eau, de préférence de la N-méthylmorpholine N-oxyde (NMMO), à des températures de l'ordre de 50 à 130 ·C, sous vide et avec évaporation d'eau. Selon l'invention, on dose séparément la cellulose et la NMMO dans le dispositif, avant de les mélanger avec un cisaillement, puis on provoque l'évaporation de l'eau jusqu'à obtention d'une solution qui est homogénéisée. On achemine ensuite la solution directement au consommateur, par l'intermédiaire de convoyeurs à vis, de pompes et de filtres.

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