Process for producing cellulose shaped bodies

C - Chemistry – Metallurgy – 08 – B

Patent

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C08B 1/00 (2006.01) C07C 291/04 (2006.01) C08J 3/09 (2006.01) C08K 5/32 (2006.01) C08L 1/02 (2006.01) D01F 2/00 (2006.01) D01F 13/02 (2006.01)

Patent

CA 2160785

The invention is concerned with a process for the production of cellulose moulded bodies, said process comprising the following steps: (A) dissolving cellulose in an aqueous solution of a tertiary amine-oxide, in particular N-methylmorpholine-N-oxide (NMMO), to produce a mouldable cellulose solution, (B) moulding said cellulose solution and conducting the moulded cellulose solution into an aqueous precipitation bath, wherein the cellulose is precipitated, thus being obtained a moulded body and a spent precipitation bath, (C) regenerating said spent precipitation bath, thus being obtained a regenerated aqueous amine-oxide solution which is used again in step (A) for dissolving cellulose, characterized in that in step (A) a regenerated, aqueous amine-oxide solution is used which has a pH value in a range whose upper and lower limits are defined, depending on the concentration of tertiary amine-oxide, by the equation pH = - 0,0015 × A2 + 0,2816 × A + f, A being the concentration of tertiary amine-oxide in said aqueous solution, expressed in % by weight of said aqueous solution, and fulfilling the condition 40% <= A <= 86%, preferably ~70% <= A <= 80%, and f having a value of 1,00 for the upper limit and a value of -1,80, preferably - 1,00, for the lower limit.

L'invention concerne un procédé de production de corps en cellulose, qui comprend les étapes suivantes: (A) dissoudre la cellulose dans une solution aqueuse d'amino-oxyde tertiaire, notamment du N-méthylmorpholine-N-oxyde (NMMO), pour obtenir une solution de cellulose moulable, (B) mouler la solution de cellulose et guider ladite solution de cellulose moulée dans un bain aqueux de précipitation dans lequel la solution est précipitée, ce qui permet d'obtenir un corps moulé et un bain de précipitation ayant déjà servi, (C) régénérer le bain de précipitation ayant déjà servi pour obtenir une solution aqueuse régénérée d'amino-oxyde, que l'on utilise à nouveau dans l'étape (A), pour dissoudre la cellulose. Ce procédé se caractérise en ce qu'une solution aqueuse régénérée d'amino-oxyde est utilisée dans l'étape (A), qu'elle comporte un pH situé dans une plage dont la limite supérieure et la limite inférieure sont définies en fonction de la concentration en amino-oxyde tertiaire, par l'équation pH = - 0,0015 x A<2> + 0,2816 x A + f A désignant la concentration en amino-oxyde tertiaire dans la solution aqueuse, exprimée en % en poids de ladite solution aqueuse et satisfaisant à la condition 40 % </= A </= 86 % de préférence 70 % </= A </= 80 %, et f désignant la valeur 1,00 pour la limite supérieure, et la valeur -1,80, de préférence -1,00, pour la limite inférieure.

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