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Prepared bleach chemical pulp using grass kind plant as raw material and preparation method thereof

A technology of plant raw materials and chemical pulp, applied in chemical/chemical mechanical pulp, non-woody plant/crop pulp, pulping with inorganic alkali, etc., can solve problems such as high carbohydrate content, difficult recycling, and large energy consumption , to achieve the effect of low price, alleviating the lack of wood resources and excellent performance

Active Publication Date: 2007-12-19
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Due to the high content of silicon and carbohydrates in the raw materials, the viscosity of the black liquor is high and the recovery is difficult
4. Grasses now contain a large number of miscellaneous cells, which pose a series of hazards to papermaking
[0010] The second issue of Chemical Industry Times in 2002 published an article entitled "Research on Low-pressure and Low-temperature Pulping of Rice Straw". In this article, rice straw was used as raw material, and bleached pulp was obtained through the steps of pre-impregnation, cooking, washing and sieving, and bleaching. Keep warm for up to 3.5 hours, requiring a lot of energy

Method used

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  • Prepared bleach chemical pulp using grass kind plant as raw material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] The wheat straw is cooked by the ammonium sulfite method, specifically 4% sodium hydroxide solution is used for pre-impregnation, the amount of ammonium sulfite added is 10% of the dry raw material, the liquid ratio is 1:4, and the temperature is raised to 110°C for the first time , keep warm at this temperature for 20 minutes, then let off steam for 20-30 minutes, heat up for 30 minutes for the second time to a temperature of 168°C, and keep warm for 90 minutes. The cooked pulp is washed and thickened to obtain an unbleached chemical pulp with a hardness of 20, equivalent to a Kappa value of 31, a degree of knockdown of 22°SR, and a concentration of 10%, and then the pulp is heated to 70°C by a screw conveyor. Transported to the medium-consistency slurry pipe. The pulp is subjected to tempering treatment in the medium-consistency stock pipe to remove the air in the pulp to make it fluidized, and then it is transported to the oxygen bleaching reaction tower by a centrif...

Embodiment 2

[0049] The rice straw is cooked by the caustic soda-anthraquinone method. Specifically, the amount of caustic soda added is 10% of the dry raw material, the anthraquinone added is 0.7% of the dry raw material, the liquid ratio is 1:4, and the temperature is raised to 110 for the first time. ℃, keep warm at this temperature for 20 minutes, let off steam for 20-30 minutes, heat up for the second time for 30 minutes to a temperature of 168 ℃, and keep warm for 90 minutes. The cooked pulp is washed and thickened to obtain an unbleached chemical pulp with a hardness of 22, which is equivalent to a Kappa value of 36, a beating degree of 24°SR, and a concentration of 12%. Then the pulp is heated to 60°C and passed through the volumetric formula. The thick slurry is pumped to the oxygen bleaching reaction tower. Before entering the reaction tower, the slurry is mixed with 40kg of added oxygen per ton of slurry and 2% sodium hydroxide of dry pulp weight in the pipeline, and steam is fe...

Embodiment 3

[0051]The wheat straw and reed are mixed according to 1:1 and then cooked by the ammonium sulfite method. Specifically, they are mixed and impregnated with 4% sodium hydroxide solution to the absolute dry raw material, then sent to the steaming ball, and 11.5% of the absolute dry raw material is added. Ammonium sulfate, liquid ratio 1:3, heat up to 100°C for the first time, keep warm at this temperature for 20 minutes, let off steam for 20-30 minutes, heat up for 30 minutes for the second time to 165°C, keep warm for 60 minutes minute. The cooked pulp is first squeezed through a single-screw squeezer, and then washed to obtain an unbleached chemical pulp with a hardness of 18, which is equivalent to a Kappa value of 27, a percussion degree of 26°SR, and a concentration of 10%. The slurry is heated to 76°C and transported to the oxygen bleaching reaction tower through a volumetric thick slurry pump. Before entering the reaction tower, the slurry is mixed with 30kg of added oxy...

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Abstract

The present invention discloses a bleached chemical pulp prepared by using graminoid plant as raw material and its preparation method. Said invention is characterized by that it utilizes a high-hardness pulp which is obtained by using cooking process and whose permanganate number is 16-28 and equal to Kappa number 26-50 and makes said high-hardness pulp undergo the processes of pulp-washing and bleaching treatment so as to obtain the invented bleached chemical pulp whose breaking length is 4500-8000 m and folding endurance is 20-70 times.

Description

technical field [0001] The invention relates to a kind of pulp and its preparation method, more specifically, the invention relates to a kind of bleached chemical pulp prepared from grasses as raw materials and its preparation method. Background technique [0002] The methods of producing pulp from plant fibers are: chemical method, mechanical method, chemical mechanical method. In the chemical method, it is divided into lime method, caustic soda method, anthraquinone-caustic soda method and sulfate method. [0003] The main components of paper are cellulose and hemicellulose. There are two kinds of plant fibers used as papermaking raw materials: wood fiber and non-wood fiber. Their main components are cellulose, hemicellulose and lignin. Pulping is a process of removing lignin as much as possible and retaining cellulose and hemicellulose. Wood fiber is a high-quality papermaking raw material and has a great advantage in the papermaking industry. With the rapid development...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21H11/06D21C3/14D21C7/00D21C3/02D21H17/64D21H17/05D21C9/18D21C9/147
Inventor 宋明信陈松涛李洪法毕衍金杨吉慧
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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