Method for synergistic treatment to improve effect of oxygen-alkali pulping

A synergistic treatment, oxygen-alkali technology, applied in the field of pulping and papermaking, can solve the problems of carbohydrate degradation and difficult pulping, and achieve the effects of improved whiteness, improved selectivity, and excellent papermaking performance.

Inactive Publication Date: 2018-12-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials for oxygen-alkali pulping have high lignin content, if the free radical control agent is added improperly, it will lead to serious degradation of carbohydrates or difficulty in pulping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] On an absolute dry basis, according to the ratio of solid-to-liquid ratio g:mL 1:10, the bagasse is mixed with hot water at 60°C evenly, and then according to the ratio of compression ratio 1:4, the mixed raw materials are conveyed into the digester by screw extrusion. Cooking, slurry concentration 11.5% (mass ratio), NaOH addition is 20% of dry raw material mass, protective agent (MgSO 4 and Na 2 SiO 3 The mixture) is added in an amount of 2.1% of the absolute dry raw material mass, where MgSO 4 with Na 2 SiO 3 The mass ratio is 1:4, and oxygen is introduced to the oxygen pressure of 0.8 MPa, and then the temperature is raised to 80°C for 50 minutes and kept for 200 minutes. In the pot; after the cooking is completed, the cooking waste liquid enters the alkali recovery, and the obtained pulp is sieved with a sieve sieving machine, and the oxygen-alkali good pulp is obtained after washing, and the obtained oxygen-alkali good pulp can be directly used for bleaching o...

Embodiment 2

[0024] On an absolute-dry basis, according to the ratio of solid-to-liquid ratio g:mL 1:7, the bagasse is mixed evenly with hot water at 45°C, and then according to the ratio of compression ratio 1:2.5, the mixed raw materials are conveyed into the digester by screw extrusion. Cooking, slurry concentration 12% (mass ratio), NaOH addition is 23% of dry raw material mass, protective agent (MgSO 4 and Na 2 SiO 3 The mixture) is added in an amount of 1.0% of the dry raw material mass, where MgSO 4 with Na 2 SiO 3 The mass ratio of the mixture is 1:7, and oxygen is introduced until the oxygen pressure is 0.6 MPa, and then the temperature is raised to 105°C for 60 minutes and kept for 170 minutes. Among them, 0.25% of the dry raw material mass of vitamin C is added to the cooking pot 40 minutes after the end of the temperature rise; After the cooking is completed, the cooking waste liquid enters the alkali recovery, and the obtained pulp is sieved with a sieve sieving machine, a...

Embodiment 3

[0026] On an absolute dry basis, according to the ratio of solid-to-liquid ratio g:mL 1:4, the bagasse is mixed with hot water at 30°C evenly, and then according to the ratio of compression ratio 1:1.5, the mixed raw materials are conveyed into the digester by screw extrusion. Cooking, slurry concentration 7.5% (mass ratio), NaOH addition is 28% of dry raw material mass, protective agent (MgSO 4 and Na 2 SiO 3 The mixture) is added in an amount of 4.0% of the mass of dry raw materials, and the amount of vitamin E added is 0.5% of the mass of dry raw materials, of which MgSO 4 with Na 2 SiO 3 The mass ratio is 1:6, and oxygen is introduced to the oxygen pressure of 0.4MPa, and then the temperature is raised to 120°C for 70 minutes and kept for 90 minutes. , after washing, the oxygen-alkali good pulp can be obtained. The obtained oxygen-alkali good pulp can be directly used for bleaching or directly beating for papermaking. After the slurry is recovered, it is mixed with the...

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Abstract

The invention discloses a method for synergistic treatment to improve the effect of oxygen-alkali pulping and belongs to the technical field of pulping and papermaking. The method comprises: pretreating raw materials through hot water at 30-60 DEG C, carrying out screw extrusion according to a compression ratio of 1: 1.5 to 1: 4, feeding the extruded materials into a digester, and adding a free radical controlling agent into the digester in digestion so that the oxygen-alkali pulping effect is improved. Compared with the conventional oxygen-alkali pulping method, the method utilizes combination of hot water pretreatment, spiral extrusion conveying and a free radical control agent to improve a fine pulp yield of oxygen-alkali pulping by 4-7%, reduce a Kappa number by 2.1 to 3.4 and improvewhiteness by 4% ISO to 6% ISO.

Description

technical field [0001] The invention relates to a method for synergistic treatment to improve the effect of oxygen-alkali pulping. The raw materials after hot water pretreatment are conveyed into a digester for oxygen-alkali pulping through screw extrusion, and a free radical control agent is added during the oxygen-alkali pulping process. To obtain high-yield, high-whiteness and high-performance pulp, which belongs to the field of pulp and papermaking. Background technique [0002] my country is a big pulp and paper country. As early as 1998, my country's consumption of paper and cardboard has reached the first place in the world. However, the lack of wood raw materials for papermaking restricts the development of my country's pulp and paper industry, so the use of non-wood fiber raw materials for pulping can be used as an important supplement for wood pulping. The traditional pulping methods of non-wood raw materials, such as caustic soda method and sulfate method, have t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22
CPCD21C3/026D21C3/222
Inventor 孙兵单映真刘玉新梁星张宝
Owner KUNMING UNIV OF SCI & TECH
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