| 摘要 |
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 alkali pulping and bleaching in solution containing NaOH, H2O2, and surfactant. After that, material is washed with water in two steps at water duty 1:(5-20), squeezed, and dried. According to this invention, before the washing step, material is acidified with nitric acid solution at 75-95°C for 1-2 h and, before drying, ground. ^ EFFECT: simplified process and improved environmental safety. ^ 3 cl, 3 ex |
