CELLULOSE MANUFACTURING PROCESS Russian patent published in 2007 - IPC D21C5/00 D21C1/06 D21C3/02 D01C1/02 

FIELD: pulp-and-paper industry.

SUBSTANCE: invention relates to manufacture of cellulose from vegetable cellulose-containing raw material and can be used to manufacture cellulose from linen material, designed for chemical processing as well as for manufacturing cotton wool and paper. Cellulose-containing material is simultaneously loosened and cleaned and then subjected to grinding, soaking in NaOH solution, cleaning, and pulping. The latter operation is effected in surfactant-containing alkali solution for 1.5-3 h at water duty 1:(5-20). Material is then washed and bleached in H₂O₂ solution, rewashed, squeezed, and dried. According to this invention, before the washing step, material is acidified with nitric acid solution and, before drying, ground. According to another embodiment of invention, material is simultaneously loosened, cleaned, pulped, and then washed. Then follow: bleaching in H₂O₂ solution for 1-2 h at water duty 1:(5-20), rewashing, squeezing, and drying. After bleaching material is acidified and, before drying, ground.

EFFECT: simplified process and improved environmental safety.

6 cl, 2 tbl, 10 ex