METHOD FOR MANUFACTURE OF FORMED CELLULOSE PRODUCTS Russian patent published in 1999 - IPC

FIELD: manufacture of formed products and regenerated aqueous solution of amine oxide used for preparing cellulose solution. SUBSTANCE: method involves, according to one version, solving cellulose in aqueous solution of tertiary amine oxide, in particular, N-methyl morpholine-N-oxide (MMO) for producing formable cellulose solution; producing cellulose solution and introducing it into water settling chamber for settling cellulose to produce formed article and used settling bath; regenerating used settling bath to produce regenerated aqueous solution of amine oxide, which may be newly employed at first stage for solving cellulose. At first stage, versions of regenerated solution of amine oxide having pH value within the range whose top and bottom level values are defined, depending on concentration of tertiary amine oxide, by formula: pH=-0.0015 x A² + 0.2816 x A + f, where A is concentration of tertiary amine oxide in aqueous solution, expressed in % by weight of aqueous solution, and satisfying the requirement of 40% ≤ A ≤ 86%, preferably 70% ≤ A ≤ 80%, and f has top level value of 1.000 and bottom level value of 1.80, preferably 1.00. EFFECT: simplified method, increased efficiency by increased thermal stability of cellulose solution and reduced tendency to destruction. 21 cl, 2 dwg, 2 tbl, 4 ex