SU1341305A1 - Liquor composition for producing fibrous cellulose-containing semiproduct - Google Patents

Abstract

The invention relates to the pulp and paper industry and allows to increase the yield and improve the physical and mechanical properties of the semi-finished product. The cooking solution for the production of fibrous cellulose-containing semi-finished product contains, wt%: white sulphate liquor 40-80, black sulphate liquor 10-30, waste liquor from oxy-alkali cellulose bleaching 10-40. The presence of spent liquor from oxygen-alkaline bleaching in the cooking solution improves the efficiency of the redox processes of interaction of the cooking liquor with wood components, resulting in an increase in the yield and quality improvement of cellulose. 3 tab. | WITH SO 4 ;: oo about SP

Description

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The invention relates to the pulp and paper industry, in particular to the composition of cooking solutions for the production of fibrous cellulose containing semi-finished product from vegetable raw material.

The aim of the invention is to increase the yield and improve the physico-mechanical properties of the semi-finished product.

The proposed cooking solution contains, wt%:

White sulphate liquor40-80

 sure sulfate lye10-30

Used lye from oxygen-base bleaching

(КЩО) 10-40

The presence of spent liquor from the food chemical plant allows to increase the efficiency of the redox processes of interaction of the cooking liquor with the wood components, as a result of which the yield of cellulose increases and its quality is improved.

The liquor from KSPO of cellulose contains peroxide compounds and low molecular weight acids - products of oxidative destruction of lignin and polysaccharides, and the spent black liquor - 1 - 1.5% of the mass of a.s. low-grade wood phenols, 10–15% of high-molecular compounds, which are lignin, planted by plants. FI alkaline peroxide can intensively interact with black liquor phenyl compounds with the elimination of methoxyl groups and the formation of orthochinoid structures. Demethylation of phenolic compounds of lignin leads to the formation of orthobenzoquinoid structures, which increase the efficiency of redox processes. The orthohinoid structures formed by the interaction of the peroxide compounds of the spent liquor from the chemical waste chemical plants with the phenolic compounds of the black sulfate liquor, accelerate the process of wood delignification, as well as stabilize the polysaccharides.

Example 1. Cooking is carried out in 250-cm-long battery autoclaves heated in a glycerin bath.

3052

For oiibiTOB use birch wood technology chips.

Cooking solution is prepared with the following composition, wt.%: White sulphate liquor 80, black sulphate liquor, respectively, 5; ten; 15, lye from KCHO respectively 15; 10; 5. For comparison, a well-known cooking solution is prepared containing, in wt.%: White sulphate liquor 80, black sulphate liquor 20.

Sulfate cooking is carried out according to the mode: temperature rise up to 115 C g 45 min; holding at this temperature for 60 minutes; raising the temperature to 170 ° C for 60 minutes, holding at this temperature for 90 minutes, the hydronic module cooking: 1: 4. The consumption of active alkali for cooking is 14% of the mass of a.s. wood

Table 1 presents the data on the composition of the cooking liquor, the yield and quality indicators of cellulose. 5 Example 2. A cooking liquor containing, in wt.%, Is prepared: white sulphate liquor 60; black sulphate liquor 30; 20; ten; lye from KCHO 10; 20; 30 respectively.

Known cooking solution contains, wt%: white sulphate liquor 60; black sulphate liquor 40. Cooking conditions are the same as in example 1.

Table 2 presents the data on the composition of the cooking liquor, the yield and quality indicators of cellulose.

Example 3. The proposed cooking solution has the following composition, wt.%: White sulphate liquor 40; black sulphate liquor 30; 20; ten; lye from KCHO 30; 40; 50 respectively. Known cooking solution contains, wt%: white sulphate liquor 40; black sulphate liquor 60.

The conditions for cooking with these cooking solutions are the same as in Example 1.

Table 3 presents data on the composition of the cooking liquor, yield 0 and quality indicators of cellulose.

As can be seen from the data presented in abl., 2 and 3, the addition of spent liquor from ASH to the cooking liquor makes it possible to increase the yield of 5 cellulose by 1-2.3% and improve its physical and mechanical properties.

In addition, the use of spent liquor from KSHCHO for the preparation of

0

five

Leaning of the cooking solution allows to reduce the volume of wastewater from the bleaching plant, which reduces the costs of industrial effluent treatment.

Claims (1)

Invention Formula A cooking solution to obtain a fibrous cellulose-containing semi-finished product containing white sulphate liquor and black sulphate liquor, characterized in that, in order to improve the physical and mechanical properties 2040 2000 2100 2200 580 580 590 590 480 490 510 500 leu semi-finished product, it additionally contains spent liquor from oxygen-base bleaching of cellulose in the following ratio of components, wt,%: White sulphate liquor40-80 Black sulfate liquor10-30 Spent lye from oxygen-alkaline bleaching of cellulose 10-AO Table 1 The amount of white sulphate liquor, wt.% The amount of black sulphate liquor, wt.% The amount of waste liquor from KDIO, wt.% Pulp yield,% of masses as wood Delignification degree units Kappa Breaking length, m Kink, the number of double kinks Tear resistance, mN Burst resistance, kPa The amount of white sulphate liquor, wt.% Amount of black sulphate liquor, wt.% The amount of spent liquor from YTST, wt.% The yield of cellulose,% of masses as wood Delignification degree units Kappa Length length, m table 2 60 60 60 thirty 20 ten ten 20 thirty 50.8 51.1 51, 8 20.0 18.2 20.6 9000 9200 9100 1960 2000 1890 580 590 580 500 510 490 40 40 40 thirty 20 thirty 40 50 52.3 53.1 52.0 19.2 18.1 20.4 8940 9100 8920 Indicator Kink, the number of double kinks Tear resistance, mN570 The resistance was forced vaiiu, kPa480 Editor A. Lezhnin Compiled by A. Monosov Tehred M.Dkdyk Proofreader A. Zimokosov Order 4A10 / 36 Circulation 340 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 1940 560 490 2040 570 490 2000 570 480