SU777121A1 - Method of producing powdered cellulose - Google Patents

Description

Nitric acid contributes to the removal of lignin from the raw materials and the production of oxidatively-hydrolytic degradation of cellulose, and hydrochloric acid, neEvr: the process of hydrolytic degradation and contributes to a better product

; color, as the chlorine formed during blending of nitrous and nitric acids bleaches the hydrocellulose. Welviente and technical indicators of 3rd grade lint cellulose powder are given in Table. 1 and 2.

Table 1

The effect of acid concentration on the duration and delignification of the raw material can be seen when comparing experiments 1, 3, 5, 7, 9, 11, 13, 15. As the concentration of acids increases, the duration decreases from 3.6 to 1.0 h, and the lignin content decreases from 0.281 to 0.170%. Hydrochloric acid accelerates

table 2

cooking-hydrolyzing process for 0.5-1.5 h.

In tab. 3 shows the comparative data of quality indicators of the target product obtained from Lint 3 grade-a according to the proposed method and the prototype, as well as cellulose produced by domestic industry.

The proposed method allows to obtain high quality powdered cellulose directly from a low-grade lint in one stage in a simplified scheme.

In addition, the method is technically more simple, since it allows the delignification of the raw material and the oxidative-hydrolytic destruction of cellulose in one stage.

The need for electrode cellulose is 2000 tons per year, saving up to 220 thousand rubles when replacing starch food.

Claims (2)

Invention Formula The method of obtaining powdered cellulose by treating the cellulose-containing raw material with a cooking-hydrolyzing solution containing a mixture of nitric and hydrochloric acids, washing the pulp, drying it and grinding, characterized in that in order to ensure the possibility of obtaining the target product directly from low grades of cotton lint and simplifying the process , the processing of the raw material is carried out with a cook-hydrolyzing solution containing 1-3% hydrochloric and 3-67o nitric acid in a module of 1:12, the boiling point of the reaction mass under normal pressure. Sources of information taken into account in the examination 1. US patent number 3388119, cl. 260-212,1968. 2. Patent of the USSR No. 16660, cl. 08B 15/02, 1927 (prototype).