Method for producing chemical wood pulp

A production method and technology for chemical wood pulp, which are applied in the fields of cellulose raw material pulping, textiles and papermaking, papermaking, etc., can solve the problems of difficulty in dissolution, long cooking time, waste of fiber raw materials, etc.

Inactive Publication Date: 2005-01-12
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the dense wood structure, the penetration of the cooking liquid into the wood chip and the dissolution of the reaction product during the cooking process are difficult, resulting in problems such as large amount of chemicals, long cooking time and high steam consumption in the production of wood chemical pulp.
In addition, the difficult penetration of cooking liquid also causes uneven pulp quality and high sieve rate
[0006] (2) For tree species with high basic density, such as older eucalyptus, it is difficult for cooking aids such as anthraquinone t

Method used

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  • Method for producing chemical wood pulp

Examples

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Effect test

Embodiment 1

[0101] The conventional Soda-AQ method pulping process condition of poplar is: use alkali amount 20% (as Na 2 O weight, with respect to dry raw material, the same below), liquid ratio 1: 4, anthraquinone 0.05%, maximum temperature 165 ℃, heating time 90 minutes, holding time 120 minutes. The pulping properties are: fine pulp yield 48.11%, reject rate 1.51%, kappa value 20.35. After beating by PFI beater for 22000 rpm, the beating degree is 43.9°SR, and it is copied into paper. Its strength index is as follows: breaking length is 7.45km, folding resistance is 930 times, and tear index is 7.52mN m 2 g -1 .

[0102] Poplar Soda-AQ pulp was produced by IED pulping process. The composition of the cooking liquid is: the amount of alkali used is 14%, the liquid ratio is 1:4, and anthraquinone is 0.05%. The soaking section uses the cooking solution at 90°C for 30 minutes. After impregnation, it is extruded by a screw extruder, and the compression ratio is 4:1. After extruding an...

Embodiment 2

[0105] The conventional KP pulping process conditions for poplar wood are: the amount of alkali used is 20%, the degree of vulcanization is 25%, the liquid ratio is 1:4, the highest temperature is 165°C, the heating time is 90 minutes, and the holding time is 120 minutes. The pulping performance is as follows: the yield of fine pulp is 48.64%, the reject rate is 0.94%, and the Kappa value is 17.67. The beating degree is 44.2°SR after 22,000 revolutions of PFI beater, and the paper is copied into paper. The strength index is as follows: breaking length is 7.79km, folding resistance is 970 times, and tear index is 7.48mN m 2 g -1 .

[0106] Yangshu KP pulp was produced by IED pulping process. The composition of the cooking liquid is as follows: the amount of alkali used is 20%, the degree of sulfidation is 25%, and the liquid ratio is 1:2, which is the same as the amount of cooking chemicals used in conventional pulping. The impregnation section uses the cooking solution at 7...

Embodiment 3

[0108] The conventional NS-AQ pulping process conditions of poplar are: alkali amount 20%, alkali ratio 0.85, liquid ratio 1:4, anthraquinone 0.1%, maximum temperature 170°C, heating time 90 minutes, holding time 330 minutes. The pulping performance is: the yield of fine pulp is 64.21%, the reject rate is 2.04%, and the Kappa value is 29.12. The beating degree is 44.8°SR after 18,000 revolutions of PFI beater, and the paper is copied into paper. The strength index is as follows: breaking length 8.21km, folding resistance 921 times, tear index 7.68mN m 2 g -1 .

[0109] Poplar NS-AQ pulp was produced by IED pulping process. The composition of the cooking liquid is as follows: the amount of alkali used is 20%, the alkali ratio is 0.85, the liquid ratio is 1:4.5, and anthraquinone is 0.1%, which is the same as that of conventional pulping and cooking chemicals. The impregnation section uses the cooking solution at 85°C for 30 minutes. After impregnation, it is squeezed and lo...

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Abstract

This invention is a chemical wood pulp productive method. It contains following steps: 1) To soak, Put the thin piece wood plate into the soak liquid container, the soaking temperature is 50-90 deg.C. Soaking time is 15-50 minutes; the soak liquids use part or whole boiling liquid. 2) To relieve squeeze and press; relieve the pressed wood plate, the pressing ratio is 3-6:1. 3) To take-out lignin: put the pressing wood plate and its soak liquid into the boiler, boiling them to do the reaction of take-out lignin.

Description

(1) Technical field [0001] The invention relates to a method for producing pulp, in particular to a method for chemically producing wood pulp. (2) Background technology [0002] Pulp and paper making is a capital, energy and technology-intensive industry. According to statistics in 1995, the total sales of the global paper industry reached 260 billion U.S. dollars, with assets of 400 billion U.S. dollars. The status of the industry is second only to the telecommunications industry and the automobile industry, and the development of the industry is consistent with the growth of the national economy. At present, the world's pulp production is over 174 million tons. [0003] Wood has a series of advantages such as stable and concentrated supply, high pulping strength, and good papermaking performance, so it has become the main fiber raw material in the pulp and paper industry. The proportion of wood pulp in the world accounts for more than 95%, and chemical wood pulp accounts ...

Claims

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Application Information

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IPC IPC(8): D21C3/00
Inventor 庞志强陈嘉川
Owner QILU UNIV OF TECH
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