SU746002A1 - Liquor for obtaining fibrous semiproduct - Google Patents

Description

The invention relates to the cellulose-paper industry and to the casa of the composition of the cooking liquor to produce sulphite, bisulphite and neutral sulphite pulps. The known solution is to prepare a fibrous semi-fabricated plant containing salts of sulfuric acid and an aqueous medium. When carrying out the sul of the phytic or bisulfite method of cooking, it contains sulfurous anhydride 1. The disadvantage of the known solution is a large amount of water for preparing the solution and the cost of subsequent treatment of waste water, as well as a relatively low yield of pulp. The purpose of the invention is to increase the efficiency of the process and increase the yield of the fibrous semi-finished product. The goal is achieved by the fact that, as an aqueous medium, the cooking solution contains waste water from biological treatment of industrial wastewater from paper-making production with an activated sludge concentration of 0.5–17 g / l in the following ratio of components, mass%: Sulfuric acid salt 0.1-1, 5 Sewage water from biological treatment Else The cooking liquor for the production of a fibrous semi-finished product is prepared as follows. Sulfuric acid salts are added to the wastewater of the biological purification system of the industrial wastewater treatment plant of pulp and paper production with an active sludge concentration of 0.5–17 g / l. at. laboratory conditions. Example 1. 30 g of air-dry wood chips are loaded into an acid-resistant autoclave made from a cooking solution. The cooking liquor is prepared on the basis of a wastewater sludge compactor. biological systems. cleaning pulses of pulp and paper industry with activated sludge concentration 0.5 g / l Content in cooking solution Components, mass%:

Free SO 1.25 Associated SO, j 0.25 - Content 0.20 Sewage water with active sludge concentration 0.5 g / l98.3

Avgoklae place and glycerin bath. Cooking is carried out when raising the TJBM temperature from 30 to 1P5 ° C 2 h 30 min; Stopping at 105 s for 1 h, - raising the temperature from 105 to 1 h 45 min while stopping at 40 min.

After cooking, the yield and the physicomechanical parameters of the obtained fibrous semi-finished product with a casting mass of 75 g / m are determined.

The output and quality indicators of the fibrous semi-finished cellulose obtained using this cooking solution, are presented in table. one. ,...

Table 1

. Cooking solution On waste water, biological treatment for sulfite boiling, pH 2.0. .0,5 51,5 55 Known cooking solution (for sulphite cooking), g 50.74. .53 pH 2.0 Cooking solution on biological wastewater for bi-1 sulfite cooking, pH 4.5 .1.7 54.0 112 Known cooking solution for bisulfite cooking 52, 2 98 qi, pH 4, 5

Example 2. Cooking solution; It is prepared in fresh water with an HtsW component with a composition similar to that shown in Example 1 (known composition).

The consumption and quality indicators of the finished fibrous semi-finished cellulose are presented in table. 1. Example 3. A cooking solution of ff pt6v t on waste water, biological treatment systems with an activated sludge concentration of 1.7 g / l. .

The composition of the liquor solution, wt.%:

Obachee .0

Na content, jO 0.15

Sewage water with activated sludge concentration 1.7 g / l-99.45

The autoclave is placed in. glycerin bath. The cooking is carried out at a temperature rise from 30 to 2.5 hours, and at 160 ° C for 2.5 hours. The yield and the indicators of the quality of the fibrous semi-finished cellulose obtained using this cooking solution are presented in Table. one,

Example 4. A cooking solution is prepared in fresh water with a component composition similar to that shown in mayor 3 (known composition). Output and quality indicators. Fiber. The hundred semi-finished cellulose is presented in Table “1.

Example 5. A cooking solution is prepared in the waste water of the system 350 270 213359 490 020 1680, 60420 480 163456450

.biological purification with an activated sludge concentration of 17 g / l.

The composition of the cooking solution, the masses,

Sodium salt

sulfurous acids1,5

Sewage water c.

the concentration of activated sludge is 17 i / l98.5 The autoclave is placed in glycerol. Cooking is carried out when lifting.

Brewer on the wastewater of biological treatment of neutral sulphite varKi, pH 7.0

17.0

Known cooking solution for neutral sulphite cooking pH 7.0: ...

 Example 6. A cooking solution is prepared in fresh water with a lump of TNT lm composition similar to that of the 3rd in Example 5 (known composition);: As follows from the data presented in Table. 1 and 2, cooking pulp and hemicellulose using the proposed cooking plant does not reduce the quality of the final product, its output at the same time increased by 1.5-2.5% compared with the known cooking solution.

Bioacidification of the liquor obtained is stable, no increase is required1.5 52 1.50

0.5

temperatures up to 3 minutes; stand at 170 ° C for 25 minutes.

After cooking, the yield and quality indicators of the obtained semi-finished fibrous semi-cellulose are determined with a casting weight of 125 g / m

The yield and quality of the fibrous semi-finished product are presented in Table 2.

, T a b l and c a. , 2

540

310

79.4 8100

290

77.0

510

7.670

The duration of the biological treatment, the oxygen consumption is almost nB different from the consumption required for the oxidation of conventional waste water of pulp and paper production-. of leadership. The rate of biooxidation increases by 30%, which leads to a decrease in the number of wastewater treatment plants.

Data on the processing of waste liquor from sulphite cooking with the application of the proposed cooking solution are presented in Table 3.

Table 3.

45.0

32.3 47.2 28.0

The economic effect of the introduction of the cooking solution is 2 million rubles. in year.

Claims (1)

1. Nepenin Yu.N. Sulphite pulp production. M .., Lesna industry 1976 ,. t, 1, s, 132-134; (prototype).