SU493528A1 - The method of obtaining fibrous cellulosic semi-finished product - Google Patents

Description

Example 1. In laboratory B-words, birch chips are boiled in autoclaves from acid-resistant steel in solutions consisting of a mixture of sodium sulfite and a post-yeast brew in various ratios. Liquid cooking module 1: 4: 5. Autoclaves are placed in a pre-heated glycerin bath. Cooking temperature - 170 ° С, duration - 35 minutes. Cooking lead without temperature rise (simulation of a continuous process).

After cooking, the pH of the spent liquor, the yield and the physicomechanical indicators of the semifinished product, as well as the presence of sediment by mixing and evaporation of the liquor obtained with the spent sulphite production solutions, are determined.

Comparison of cooking parameters of the proposed and known methods, as well as quality indicators of the obtained samples of semi-finished products are given in table. one.

Table 1

Example 2. In laboratory conditions, birch chips are boiled according to a regime similar to that described in Example 1 in solutions consisting of a mixture of sodium monosulfite and sulphite liquors in various ratios.

The ratio of the cooking parameters of the proposed and known methods, as well as quality indicators of the obtained samples of semi-finished products are given in table. 2

As follows from the table. 1 and 2, the quality indicators and the output of the proposed and known semi-finished products are on the same level. The absence of sediment at the displacement and evaporation of the spent liquor obtained by this method with the spent sulfite liquors indicates the possibility of their joint regeneration.

Thus, the proposed method provides the possibility of organizing additional production of a semi-finished high-yield by combining the production liquors of enterprises operating exclusively in the sulphite and neutral-sulphite methods.

The possibility of joint processing of liquors obtained as a result of the production of a semifinished product according to the proposed method with lyes for sulphite production also makes it possible to increase the amount of yeast, which is extremely necessary in the national economy.

Thus, the effective use of post-yeast brew and spent sulphite liquor as active cooking reagents makes it possible to switch to the integrated use of vegetable raw materials in the pulp and paper industry.

Subject invention

Claims (3)

1. A method of producing a fibrous cellulosic semi-finished product by steaming a raw cellulose-containing raw material, followed by boiling at a temperature of 160-180 ° C with a sodium monosulfite-based cooking solution in an amount of up to 3% in units of Na2O based on the weight of absolutely dry plant raw material and adding the used cooking solution that differs the fact that, in order to expand the raw material base and enable the regeneration of the spent liquor together with the sulfite spent liquors, used as an additive th sulfite solution with a concentration of paramagnetic centers of 7.6-1018-7.6-1020 spin / g. 2. A method according to claim 1, characterized in that a post-yeast brew in an amount of 10-40%, based on its dry substances, is used as the spent sulphite solution. 3. The method according to claim 1, characterized in that as the spent sulfite solution, used sulfite liquor is used in an amount of 0.1-0.5% in units of SO2 based on the weight of the absolutely dry vegetable raw material.