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A method for strengthening pre-impregnation of chemical thermomechanical pulp

A chemical thermomechanical and chemical impregnation technology, applied in pulp beating/refining method, pulping with inorganic alkali, pulping with organic solvent, etc. Work load, affecting pulp quality and other problems, to achieve the effect of improving pulp quality, reducing refining energy consumption, and simple process transformation

Inactive Publication Date: 2011-12-07
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem caused by this is that it is difficult for raw materials with high density to be soaked and softened by chemical pre-impregnation liquid in a short period of time. On the one hand, it increases the probability of the fiber being forcibly torn, and produces more fine fibers, which affects the pulp quality
Although the above problems can be improved to a certain extent by simply increasing the dosage of chemical impregnation, but at the same time, it will also cause an increase in the pollution load of the pulping waste liquid and a decrease in the pulping yield.

Method used

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  • A method for strengthening pre-impregnation of chemical thermomechanical pulp
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  • A method for strengthening pre-impregnation of chemical thermomechanical pulp

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Effect test

Embodiment 1

[0022] The process condition of triploid poplar tomentosa adopting enhanced pre-impregnation chemical thermomechanical pulping method: get triploid poplar tomentosa wood chips 2kg (dry); I stage chemical pre-impregnation, NaOH consumption 1%, penetrant consumption 0.2%, The solid-liquid ratio is 1:3, the temperature is 90°C, and the immersion time is 40 minutes; the compression ratio is 4:1; 2 SO 3 The dosage is 3%, the dosage of penetrant is 0.2%, the solid-liquid ratio is 1:4, the temperature is 120°C, the soaking time is 30min; three-stage refining, the concentration is 30%, the disc grinding gap is 1.5mm→0.4mm→0.1mm; , temperature 80°C, time 30min; screening, sieve gap 0.15mm.

[0023] The technological conditions of adopting conventional chemical thermomechanical pulping method for triploid Populus tomentosa: get 2kg (dry) of triploid Populus tomentosa wood chips; steam at normal pressure for 15min; extrude and decompress, compression ratio 4: 1; NaOH dosage 3%, Na 2 S...

Embodiment 2

[0030] Eucalyptus wood adopts the process condition of strengthening pre-impregnation chemical thermomechanical pulping method: get eucalyptus wood chips 2kg (dry); I section chemical pre-impregnation, NaOH consumption 1.5%, penetrant consumption 0.3%, solid-to-liquid ratio 1 : 3, temperature 90°C, immersion time 40min; extrusion defrosting, compression ratio 4:1; stage II chemical impregnation, NaOH dosage 2.5%, NaOH 2 SO 3 The dosage is 3%, the dosage of penetrant is 0.2%, the solid-liquid ratio is 1:4, the temperature is 130°C, the soaking time is 30min; three-stage refining, the concentration is 30%, the disc grinding gap is 1.5mm→0.5mm→0.1mm; , temperature 80°C, time 30min; screening, sieve gap 0.15mm.

[0031] Eucalyptus wood adopts the technological condition of conventional chemical thermomechanical pulping process: get eucalyptus wood chips 2kg (absolutely dry); Normal pressure steaming 15min; Extrusion loosening, compression ratio 4: 1; Chemical impregnation, NaOH c...

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Abstract

The invention discloses a method for intensified pre-impregnation of chemical thermomechanical pulp, which is an improvement to the pulping process of chemical thermomechanical pulp, mainly improving the swelling and softening of wood through two-stage impregnation and adding chemical additives The effect is to reduce the forced tearing of fibers in the process of extrusion, defrosting and refining, and reduce the residual rate of fiber bundles. At the same time, it can strengthen the cleaning of colored substances in the slurry, so as to obtain more uniform fiber length and better quality. Thermomechanical pulp, and can reduce pulping power consumption. Although the present invention adopts two stages of chemical impregnation, its effect is mainly achieved by rationally distributing chemical impregnated drugs and improving drug utilization efficiency, rather than greatly increasing the amount of chemicals used, so the pollution load will not be significantly increased.

Description

technical field [0001] The invention relates to the field of chemical mechanical pulping, which is an improvement to the chemical thermomechanical pulping process, in particular to improve the pulping performance of chemical thermomechanical pulp by strengthening the effect of chemical pre-impregnation, and reduce the power consumption of pulping at the same time. Background technique [0002] Chemical mechanical pulping is a kind of pulping method developed in the 1970s. Its basic feature is to use a screw extruder to extrude and decompose the pulping raw materials, and to pre-impregnate the raw materials with a small amount of chemicals, and then mainly rely on It is ground into pulp with different properties by disc milling. Because only a small amount of chemicals are used in this process, the utilization rate of fiber raw materials in chemical mechanical pulping is much higher than that of chemical pulping (the yield can reach more than 90%), and at the same time, less ...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C3/20D21D1/20
Inventor 田超薛崇昀陈彬聂怡
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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