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Clean pulp preparation process for high-whiteness and high-strength chemical straw pulp

A clean pulping and high-strength technology, which is applied in the pulping of cellulose raw materials, textiles and papermaking, papermaking, etc., to achieve the effects of low pulping cost, light environmental pollution and high strength

Active Publication Date: 2012-02-29
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high energy consumption, low extraction rate, serious pollution and complicated process in the above straw pulp preparation process, the present invention provides a Clean pulping process of chemical straw pulp with less water consumption, low energy consumption, no night generation, high whiteness and high strength

Method used

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  • Clean pulp preparation process for high-whiteness and high-strength chemical straw pulp

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) The raw material is wheat straw, which is cut to a length of 1-4 cm with a hay cutter, and the dust is removed while cutting the grass, and then water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent are added, and the amount of sodium hydroxide is the weight of wheat straw 5% of the weight of wheat straw, the amount of hydrogen peroxide is 10% of the weight of wheat straw, the liquid ratio is 1:4, the amount of metal ion chelating agent is 0.5% of the weight of wheat straw, after the temperature is kept at 75 ° C for 50 minutes, stop heating and complete the first step cooking to obtain cooking liquid;

[0025] (2) Open the cooking pot and add water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent to the cooking liquid. The amount of sodium hydroxide is 10% of the weight of wheat straw, and the amount of hydrogen peroxide is 24% of the weight of wheat straw. The ratio is 1:4, the amount of metal ion chelating agent is 0.6% of the...

Embodiment 2

[0031] (1) The raw material is rice straw, which is cut to a length of 1-4 cm with a hay cutter, and the dust is removed while cutting grass, and then water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent are added, and the amount of sodium hydroxide is the weight of rice straw The amount of hydrogen peroxide is 10% of the weight of rice straw, the liquid ratio is 1:5, and the amount of metal ion chelating agent is 0.6% of the weight of rice straw. After the temperature is kept at 80°C for 60 minutes, the heating is stopped and the first stage is completed. step cooking to obtain cooking liquid;

[0032] (2) Open the cooking pot and add water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent to the cooking liquid. The amount of sodium hydroxide is 10% of the weight of rice straw, and the amount of hydrogen peroxide is 20% of the weight of rice straw. The ratio is 1:6, the amount of metal ion chelating agent is 0.8% of the weight of the straw...

Embodiment 3

[0038] (1) Reeds are used as raw materials, cut to a length of 1-4 cm with a hay cutter, dust is removed while cutting, and then water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent are added. The amount of sodium hydroxide is 1 / 2 of the weight of reeds 10%, the amount of hydrogen peroxide is 24% of the weight of the reed, the liquid ratio is 1:5, and the amount of metal ion chelating agent is 0.8% of the weight of the reed. After the temperature is kept at 70°C for 60 minutes, stop heating and complete the first step. Cooking to obtain cooking liquid;

[0039] (2) Open the cooking pot and add water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent to the cooking liquid. The amount of sodium hydroxide is 6% of the weight of the reed, and the amount of hydrogen peroxide is 12% of the weight of the reed. The ratio is 1:4, the amount of metal ion chelating agent is 0.5% of the reed weight, and the temperature is kept at 95°C for 1 hour to comp...

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Abstract

The invention relates to the technical field of pulping and papermaking, in particular to a clean pulp preparation process for high-whiteness and high-strength chemical straw pulp. The process comprises the following steps of: adding water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent into a straw raw material, performing heat preservation at the temperature of between 70 and 80 DEG C, and obtaining cooking liquor; and adding water, sodium hydroxide, hydrogen peroxide and metal ion chelating agent into the cooking liquor, performing heat preservation at the temperature of between 90 and 95 DEG C to finish second cooking, performing stock screening, pulping, and thus obtaining the chemical straw pulp. The pulp prepared by the process has whiteness and high strength, and the pulp preparation cost is low; the produced pulp does not need subsequent treatment such as washing and bleaching, but the whiteness and the strength of the pulp reach relatively high standards, and no black liquor is discharged; massive water resource and energy consumption are saved, and the waste liquor can be recycled or directly discharged and has very low pollution to the environment; and because wheat straw, rice straw, sorghum stem, sugarcane bagasse, reed, Chinese alpine rush or the like is used as the raw material, the pulp preparation process is particularly suitable to be adopted by medium and small papermaking plants of China.

Description

[0001] technical field [0002] The invention relates to the technical field of pulping and papermaking, in particular to a clean pulping process for high-whiteness and high-strength chemical straw pulp. [0003] Background technique [0004] my country's forest resources are poor, and the per capita forest area and per capita stock volume are very low. However, my country is the country with the largest output and richest experience in non-wood fiber papermaking in the world. The production of straw pulp occupies an absolute dominant position in non-wood pulp. [0005] The production of straw pulp has problems such as high raw material consumption, low pulping yield, serious waste liquid pollution, difficult bleaching of pulp, and low paper strength. These shortcomings limit the further development of wheat straw pulp production. The traditional ball steaming pulping method generally adopts high alkali, high temperature, and anthraquinone pulping method. In order to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/00
Inventor 陈嘉川杨桂花田野
Owner QILU UNIV OF TECH
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