CELLULOSE REFINING METHOD Russian patent published in 2019 - IPC D21C3/00 D21C9/00 

FIELD: paper production; cellulose production.

SUBSTANCE: invention relates to production of refined cellulose, intended for production of artificial fibres, and can be used in chemical industry, cosmetic and pharmaceutical industry, engineering, for modification of cellulose and lignocellulose materials and when producing their derivatives for special purposes. Method of cellulose refining consists in treatment of bleached cellulose with an alkali solution, obtained product is washed and dried, before treatment with alkali solution, bleached wood pulp is mixed with water with dispersion, the obtained suspension is filtered, the obtained residue is washed with water, repeatedly filtered and water is removed therefrom with subsequent treatment with an alkali solution. After that, during washing, obtained product is filtered out with subsequent drying. Cellulose can be represented by plant cellulose or cellulose.

EFFECT: disclosed method represents an independent step for chemical modification of cellulose and can be used to refine any commercial bleached cellulose to obtain a product with high degree of purity.

3 cl, 4 ex