SU678113A1 - Method of treating pulp after digesting - Google Patents

Description

(54) METHOD FOR PROCESSING PULP PULSE

washed in a multistage washing installation. The mixture of monosulfite and cooking liquor obtained after the run is sent for joint regeneration.

A reduction in the consumption of fresh water per flush and an increase in the concentration of solids in the mixture of liquors in comparison with the known method is achieved due to the fact that OI: only once is stored. V-.

Example 1. Unbleached sulphate granulose of the Arkhangelsk pulp and paper mill, taken after the blown tank to 67,8113

The washes were squeezed out of the free flowing liquor, which had a density of 1.06 g / cm2, and then 4.6 ml of the spent monosulfite liquor of the Arkhangelsk PPM with a density of 1.048 at 21 s were added to 1 g of cellulose and kept at 7 p-80 C for 1 hour. pH among the treatment was 9.7. After treatment, the mass was washed on a Büchner funnel with water and the cellulose yield was determined, the content of pentrzans according to GOST 10820-75, and the mechanical parameters of the pulp 7 The obtained results are presented in table B (1 row). . .

Sudafatna cellulose, processed according to pred1yub, 1 11.8 lagged method

Sulphate pulp, “„ processed by iz. the known method 103.0 12.4

.-, ts Sulphate cellulose, -, washed with water 100.0 9.1

Sulphite pulp, processed according to the previous 105, 9 lagged process

Sulfite pulp, OGG,

100.0 washed with water

EXAMPLE 2 Sulfate pulp and cellulose was washed with Buchner water to colorless wash water and then subjected to treatment with monosulfite liquor in the formula of Example 1. Further processing was filled in the same way as in Example 1. Semi-henary results are presented in Table 11. (2 line). .h

Example 3. For comparison, unbleached sulphate pulp, washed with water to colorless: npO viaffffi ° SS2, was analyzed as in example 1. The results obtained are presented in the table (3rd row). -.Г ,,,

Example 4. Washed Sul (11x Unbleached Cellulose ApxaJirejtbCKO pulp and paper mill was mixed with sulphite waste liquor (5 ml / g cellulose) with a density of 1.048 at 20 ° C and heated in 10 minutes to 70-80 ° C. Then 4.5% monosulfite liquor was added. ml / g of cellulose and treated as in Example 1. The washing of the cellulose after treatment and the determination of yield and mechanical PROPERTIES was carried out analogously to Example IV. The obtained E 1 values are presented in the table (4th row). - - ---

8800

6.4

nineteen

6493

18

6.0

19 8490 6.3

4.0

7650

31

6990 3.7

36

 Example 5. For comparison, washed washed sulphite unbleached pulp.

analyzed as in example 4 (line 5). ..-...-.

As shown in the table, the yield of sulfate cellulose increased by 6.1%, and sulfite pulp increased by 5.9%. Compared with the known method, the yield of sulphate unbleached pulp is 3.1%, the tM as the content of pentosans in cellulose is about the same, the increase in the yield of cellulose in the proposed method can be explained by precipitation of some lignin from sulphate under monogrammed lye. Mechanical performance: castings

sulphate pulp remained at the same level, at sulphite pulp - increased by 8-10%.

Claims (2)

DETAILED DESCRIPTION A method for treating cellulose after cooking by sorting it, washing it from cooking liquor, reacting with spent monosulfite liquor, removing spent monosulfite liquor and grinding, and so on. that, in order to simplify the process, the interaction 5; 81136 VIS with waste monosulphite Sources of information received by Sun5 Locom is subjected to a sorted intent. lulose before it is promoted from a deliberately 1, N. Galeeva. Production of liquor, and the removal of spent lucelluloi and cellulose of high monosulfite liquor is carried out. M., s. 162-165, 1970. during washing the pulp from the cook-t 2. USSR author's certificate common liquor .; No. 558998, M. KJi., D 21 C 9/00, 1975.