Forming solutions of cellulose in aqueous tertiary amine oxide

Details Forming solutions of cellulose in aqueous tertiary amine oxide Forming solutions of cellulose in aqueous tertiary amine oxide

D - Textiles, Paper

01

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D01D 1/02 (2006.01) C08B 1/00 (2006.01) D01F 2/00 (2006.01) D01F 2/02 (2006.01)

Patent

CA 2209567

A method is described for forming a solution of cellulose in a tertiary amine oxide (such as N-methylmorpholine N-oxide) and a non-solvent for cellulose (such as water). The method involves the preparation of a mixture containing excess non-solvent, and removing the excess by heating the mixture to a temperature in excess of the boiling point of the non-solvent at a predetermined sub-atmospheric pressure, and feeding the heated mixture into the introduction zone of a mixing chamber at the predetermined sub-atmospheric pressure, so as to cause flash evaporation of some of the excess non-solvent. The mixture in the mixing chamber is then agitated by a rotor and transported through the mixing chamber whilst further evaporation of the non-solvent occurs. The cellulose solution thus formed is extracted from the mixing chamber, and the evaporated non-solvent withdrawn in cocurrent mode from the same end of the mixing chamber. Apparatus for carrying out the method is also described.

La présente invention concerne un procédé de préparation d'une solution de cellulose dans un oxyde d'amine tertiaire (par exemple, N-oxyde de N-méthylmorpholine) et d'un non-solvant de la cellulose (par exemple, l'eau). Ce procédé consiste à préparer un mélange contenant du non-solvant en excès, à retirer cet excès par chauffage dudit mélange à une température supérieure au point d'ébullition du non-solvant sous une pression prédéterminée inférieure à la pression atmosphérique, et à alimenter la zone d'introduction de la chambre de mélange avec le mélange chauffé, et ce sous la même pression prédéterminée inférieure à la pression atmosphérique de manière à provoquer l'évaporation éclair d'une fraction du non-solvant en excès. Dans la chambre de mélange, un rotor effectue ensuite l'agitation du mélange qui est transporté à travers ladite chambre pendant que le non-solvant continue de s'évaporer. On extrait de la chambre de mélange la solution de cellulose ainsi formée, et on retire le non-solvant ayant subi l'évaporation en mode cocourant à partir de la même extrémité de la chambre de mélange. L'invention concerne également l'appareil de mise en oeuvre de ce procédé.

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