PROCESS FOR PRODUCING CELLULOSE SHAPED BODIES

摘要

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 .times. A2 + 0,2816 .times. 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% .ltoreq. A .ltoreq. 86%, preferably ~70% .ltoreq. A .ltoreq. 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.