Method for bleaching of hardwood sulphate pulp

FIELD: textile fabrics, paper.

SUBSTANCE: method is related to bleaching of hardwood sulphate pulp and may be used in pulp and paper industry for production of fibrous semi-finished products for production of printing types of paper. Suggested method is realised in the following manner. Unbleached hardwood sulphate pulp is disintegrated in water, then squeezed, placed into bleaching bath and delignificated by sodium hypochlorite with its consumption of 3% (in units of active chlorine) from mass of absolutely dry fiber. Then cellulose mass is flushed by water. Then double-stage bleaching of cellulose is carried out by sodium chlorite in acid medium with intermediate alkaline extraction. At the first stage of bleaching sodium chlorite consumption makes 1.5-2.5% (in units of active chlorine), and at the second stage of bleaching it makes 0.4-0.5% (in units of active chlorine) from mass of absolutely dry cellulose. After the first stage of bleaching by sodium chlorite mass is flushed by water and exposed either to oxidising alkaline treatment in the presence of hydrogen peroxide at its expenditure of 0.5%, expenditure of sodium hydroxide of 2.0% from mass of absolutely dry fiber, or alkaline treatment with hydrogen peroxide at its expenditure of 1.0%, expenditure of sodium hydroxide of 0.5%, sodium silicate - 3.0% from mass of absolutely dry fiber. After alkaline extraction cellulose is flushed, and the second stage of bleaching by sodium chlorite is carried out. Afterwards mass is flushed with water, and its acid treatment is carried out with hydrochloric acid.

EFFECT: improved quality of bleached cellulose, enhanced efficiency of process and ecological safety.

1 tbl, 6 ex

 

The invention relates to a method of bleaching hardwood sulphate pulp and can be used in the pulp and paper industry for the production of fibrous semi-finished products for the manufacture of printed paper types.

There is a method of bleaching unbleached sulphate pulp from hardwood by carrying out successive processes: be in the presence of sodium hypochlorite, chlorine, be, hypochlorite bleaching, two-stage chlorine dioxide bleaching with intermediate alkaline extraction and final kislovka (A.S. No. 781243, CL D21 9/10, publ. 23.11.80 year).

The disadvantages of this method are educated in the process of pulp bleaching carcinogenic and mutagenic organochlorine substances that have a harmful impact on the environment and human health; the duration of the bleaching process; a large number of bleaching stages, requiring an increased flow of fresh water to rinse the pulp between stages of bleaching, bleaching and auxiliary equipment, which, in turn, requires large manufacturing facilities.

Closest to the proposed method of bleaching hardwood sulphate pulp is a method of bleaching Lebergott scheme D-(Y+P)-D According to this method, the bleaching is conducted with gaseous chlorine dioxide in the two is tupeni, between them spend alkaline extraction in the presence of hydrogen peroxide with a total consumption of NaOH 1.5 to 4% by weight of the absolutely dry fiber (Ponomarev I. Scientific and technical progress in the pulp and paper industry abroad. Overview of NIPIEIlesprom, VIP, M., 1982, p.20).

The disadvantages of this method are the high consumption in the bleaching of pulp expensive reagents chlorine dioxide and hydrogen peroxide, which leads to increased costs of bleaching; not enough high stability of white (loss of white during thermal aging in air for 6 h are 4-4,4%) and mechanical strength (breaking length 7000-7800 m); high content in bleached cellulose resins and fats that cause the production of the resin difficulties in obtaining paper. In addition, for the bleaching of gaseous reagents must be cellulose fluff in a state that requires a high capital cost and large power consumption.

The characteristics of the prototype, which is common with the claimed solution, the bleaching of hardwood sulphate pulp with the use of compounds of chlorine dioxide and an intermediate alkaline extraction of cellulose in the presence of hydrogen peroxide.

Objectives of the invention are to increase the efficiency of the bleaching process by reducing the costs of expensive reagents, environmental process for the even replace gaseous chlorine dioxide in an aqueous solution of its salts of sodium chlorite, as well as improving the quality bleached pulp (increasing the mechanical strength and stability of white, the decrease in the mass fraction of resins and fats).

The problem is solved due to the fact that in the known method of bleaching hardwood sulphate pulp, including its treatment in the acidic environment of the compounds of chlorine dioxide in two stages with conduction between the levels of alkaline extraction in the presence of hydrogen peroxide, as compounds of chlorine dioxide using an aqueous solution of its salts of sodium chlorite with its total consumption of 2.0-2.9% (in% of active chlorine) from the mass of absolutely dry fiber, prior to bleaching with sodium chlorite are delignification with sodium hypochlorite with its consumption 3% (in% of active chlorine) from the mass of absolutely dry fiber, and alkaline extraction is carried out by oxidative alkaline processing flow of hydrogen peroxide 0.5% of the mass of absolutely dry fiber or alkaline bleaching with hydrogen peroxide when the flow rate of 1.0%, the consumption of sodium hydroxide and 0.5%of sodium silicate to 3.0% by weight of the absolutely dry fiber.

Signs, distinctive features of the prototype, as compounds of chlorine dioxide using an aqueous solution of its salts of sodium chlorite with its total consumption of 2.0-2.9% (in% of active chlorine) from the mass of absolutely dry fiber, prior to bleaching with sodium chlorite conduct of Affairs is gnificance sodium hypochlorite with its consumption 3% (in units of active chlorine) from the mass of absolutely dry fiber, and the alkaline extraction is carried out by oxidative alkaline processing flow of hydrogen peroxide 0.5% of the mass of absolutely dry fiber or alkaline bleaching with hydrogen peroxide when the flow rate of 1.0%, the consumption of sodium hydroxide and 0.5%of sodium silicate to 3.0% by weight of the absolutely dry fiber.

The proposed method for the bleaching of pulp is carried out as follows.

Unbleached hardwood sulphate pulp disintegrate in water, wring out, placed in a bleaching bath and spend the delignification. To do this, add to the bath the required amount of sodium hydroxide and sodium hypochlorite. The delignification with sodium hypochlorite (stage D) is carried out at a temperature of 35-38°C for 3 h and the mass concentration of 10%. After delignification of the pulp mass is washed with water.

Next, perform a two-stage pulp bleaching with sodium chlorite in acidic medium with an intermediate alkaline extraction: oxidative alkaline treatment in the presence of hydrogen peroxide (stage PS) or alkaline bleaching with hydrogen peroxide (stage P).

In the first bleaching stage (stage HT1) consumption of sodium chlorite is 1.5-2.5% (in% of active chlorine), the second bleaching stage (stage HT2) - 0,4-0,5% (% active chlorine) of the mass of absolutely dry C is lulzy. The concentration of mass at both stages of bleaching is 10%, temperature 70°the duration of each stage of 2 hours.

After the first bleaching stage chlorite sodium mass is washed with water and subjected to alkaline or oxidative treatment in the presence of hydrogen peroxide when the flow rate of 0.5%, the consumption of sodium hydroxide and 2.0% by weight of the absolutely dry fiber, or alkaline bleaching with hydrogen peroxide when the flow rate of 1.0%, the consumption of sodium hydroxide and 0.5%of sodium silicate to 3.0% by weight of the absolutely dry fibers for 2.0 hours at a temperature of 70°and the mass concentration of 10%. After alkaline extraction, the pulp is washed and conduct the second stage bleaching with sodium chlorite. Then the mass is washed with water and hold her acid treatment with hydrochloric acid at a flow rate of 1.0% for 40 min at room temperature.

Examples of specific performance.

Example 1. Unbleached hardwood sulphate pulp weighing 40 g of absolutely dry fiber stiffness 102 PED disintegrable in water, pressed with a Buechner funnel and placed in a porcelain Cup, which was heated in a thermostat to maintain constant temperature. The mass was heated to a temperature of 35-38°and was added a solution containing sodium hypochlorite - 3.0% and sodium hydroxide and 2.0% by weight of absolutely dry pulp. The delignification hypochlorite intothree is conducted for 3 hours at a temperature of 35-38° C.

After delignification, the pulp was washed with water on a Buechner funnel and placed in a porcelain Cup, which was heated in a thermostat. When the temperature of the bleaching 70°in mass was poured bleach solution consisting of sodium chlorite in the amount of 1.5% and hydrochloric acid to 2.0% by weight of the absolutely dry fiber. The bleaching was carried out for 2.0 hours at a temperature of 70°and the mass concentration of 10%.

After the first bleaching stage chlorite sodium cellulose pulp was washed in the same way and subjected to oxidative alkaline treatment in the presence of hydrogen peroxide. To do this, the washed pulp mass was heated to a temperature of 70°With, then was added a solution containing sodium hydroxide in the amount of 2.0% hydrogen peroxide and 0.5% by weight of the absolutely dry fiber. Oxidative alkaline treatment was carried out for 2 h at a temperature of 70°and the mass concentration of 10%.

Next, the pulp was washed and carried out the second stage bleaching with sodium chlorite. The washed pulp mass was heated to a temperature of 70°and it poured bleach solution consisting of sodium chlorite in the amount of 0.5% (% active chlorine) and hydrochloric acid and 2.0% by weight of the absolutely dry fiber. The bleaching was carried out for 2.0 hours at a temperature of 70°and the mass concentration of 10%.

After the mass bleaching industry is Ali water on a Buechner funnel and spent acid treatment weight hydrochloric acid at a flow rate of 1.0% for 40 min at room temperature.

Example 2. Unbleached sulphate pulp from hardwood weighing 40 g of absolutely dry fiber stiffness 102 PED bleached in a similar manner as in example 1, with the consumption of sodium chlorite on the first level of 2.0% (% active chlorine) from the mass of absolutely dry fiber.

Example 3. Unbleached hardwood sulphate pulp weighing 40 g of absolutely dry fiber stiffness 102 PED bleached in a similar manner as in example 1, with the consumption of sodium chlorite on the first level of 2.5% (in% of active chlorine), in the second stage of 0.4% (in% of active chlorine) from the mass of absolutely dry fiber.

Example 4. Unbleached hardwood sulphate pulp weighing 40 g of absolutely dry fiber stiffness 102 PED bleached in a similar manner as in example 1. After the first bleaching stage chlorite sodium cellulose mass was subjected to alkaline bleaching with hydrogen peroxide when the flow rate of 1.0%, the consumption of sodium hydroxide and 0.5%of sodium silicate to 3.0% by weight of the absolutely dry fibers for 2.0 hours at a temperature of 70°and the mass concentration of 10%.

Example 5. Unbleached hardwood sulphate pulp weighing 40 g of absolutely dry fiber stiffness 102 PED bleached as in example 2. After the first bleaching stage chlorite sodium cellulose mass was subjected to alkaline bleaching with hydrogen peroxide as in example 4.

Por what measures 6. Unbleached hardwood sulphate pulp weighing 40 g of absolutely dry fiber stiffness 102 PED bleached as in example 3. After the first bleaching stage chlorite sodium cellulose mass was subjected to alkaline bleaching with hydrogen peroxide as in example 4.

The result of bleaching and quality bleached pulp are shown in table.

From the table it is seen that, using the schemes of the bleaching delignification with sodium hypochlorite, a two-stage bleaching with sodium chlorite with an intermediate alkaline extraction by oxidative alkaline treatment in the presence of hydrogen peroxide or alkaline peroxide bleaching wardrode, you can get bleached sulphate hardwood pulp with whiteness 84-88% and sufficiently high mechanical strength. Thus, the decrease of the mass fraction of resins and fats in bleached pulp about three times, which is important for pulp from hardwood.

Thus, the proposed method of bleaching pulp in comparison with the prototype allows you to:

to improve the efficiency of the process by reducing the consumption of expensive reagents under dobelli pulp and inclusion in the scheme bleaching stage delignification with sodium hypochlorite, which is cheap bleaching reagent, as well as to improve the sustainability of the process by C the exchange of gaseous chlorine dioxide in an aqueous solution of its salts of sodium chlorite;

- to obtain a bleached pulp with a higher degree and stability of whiteness, high mechanical strength and low content of resins and fats, which solves the problem of pitch problems in the manufacture of paper from hardwood.

Table
ExampleScheme bleachingConsumption of NaClO2,% (% active chlorine) from the mass of absolutely dry fiberIndicators bleached pulp
I stepLevel IIOutput, % of unbleachedRigidity, pegWhite, %Loss of white during thermal aging in air for 6 h %Mass fraction of resins and fats, %
after bleachingafter heat aging for 6 h
Unbleached pulp--10010246,0-0,59
11,50,5for 93.426 84,083,21,00,24
2G-HT1-PS-HT2- 2,00,592,61986,085,01,20,19
32,50,4for 91.317of 87.085,81,40,17
41,50,591,82485,084,30,80,21
5G-HT1-P-HT2- 2,00,590,618of 87.086,01,10,17
62,50,489,71588,0of 87.01,10,16

Continuation of the table
ExampleScheme bleachingConsumption of NaClO2,% (% active chlorine) from the mass of absolutely dry fiberMechanical properties of bleached pulp
I shall open Level IIBreaking length, mResistance
punching shear, kPafracture, CDPtear, mn
Unbleached pulp--9760480890590
1G-HT1-PS-HT2- 1,50,58620440560560
22,00,58560400520530
32,50,48410380480510
4G-HT1-P-HT2- 1,50,58760420640640
52,00,58620380610620
62,50,48510360550610

Method of bleaching hardwood sulphate pulp by its processing in two steps compounds of chlorine dioxide with holding between steps Mel who offered the extraction in the presence of hydrogen peroxide, characterized in that compounds of chlorine dioxide using an aqueous solution of its salts of sodium chlorite with its total consumption of 2.0-2.9% (in% of active chlorine) from the mass of absolutely dry fiber, prior to bleaching with sodium chlorite are delignification with sodium hypochlorite with its consumption 3% (in% of active chlorine) from the mass of absolutely dry fiber, and the alkaline extraction is carried out by oxidative alkaline processing flow of hydrogen peroxide 0.5% of the mass of absolutely dry fiber or alkaline bleaching with hydrogen peroxide when the flow rate of 1.0%, the consumption of sodium hydroxide at 0.5%of sodium silicate to 3.0% by weight of the absolutely dry fiber.



 

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