Production method of dissolving pulp

A technology for dissolving pulp and pulp, which is used in textiles, papermaking, and fiber raw material processing. and cooking time, the effect of preventing degradation

Active Publication Date: 2013-05-29
济南绿泉新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the concept of comprehensive and effective high-value utilization of fiber raw materials, in the production process of dissolving pulp with cellulose as the main component, fully consider the high-value utilization of hemicellulose and lignin in fiber raw materials, and at the same time Aiming at the problems existing in the current dissolving pulp production process, such as difficulty in controlling the degree of cellulose polymerization, high consumption of bleaching chemicals, and difficult disposal of waste liquid, a prehydrolyzed peroxyacid cooking pulping method is proposed.

Method used

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  • Production method of dissolving pulp

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Effect test

Embodiment 1

[0046] Poplar adopts technology of the present invention to carry out cooking and bleaching, and cooking flow process is as follows: figure 1 shown. After cooking, the pulp was treated with hemicellulase, followed by alkaline extraction, oxygen delignification, chlorine dioxide bleaching and hydrogen peroxide bleaching, that is, the EODP bleaching process was used for bleaching. The specific process conditions and pulp properties are shown in Table 1. Show. The amount of bleaching chemicals in Table 1 is relative to the absolute dry pulp. The resulting dissolving pulp had a brightness of 91%ISO, an α-cellulose content of 97.0%, an intrinsic viscosity of 810 ml / g and a pentosan content of 1.95%.

[0047] process Process conditions Prehydrolysis Steam pressure 0.8 MPa, liquid ratio 1:6, time 45 min peroxyacid cooking Formic acid concentration 80% (v / v), hydrogen peroxide 2% (for absolute dry pulp), liquid ratio 1:6, temperature 120oC, time 40 min ...

Embodiment 2

[0049] Eucalyptus adopts technology of the present invention to carry out cooking and bleaching, and flow process and process condition are the same as Table 1. The resulting dissolving pulp had a brightness of 90% ISO, a content of α-cellulose of 96.5%, an intrinsic viscosity of 795 ml / g and a content of pentosan of 1.85%.

Embodiment 3

[0051] Bamboo adopts technology of the present invention to carry out cooking and bleaching, flow process and technology as shown in table 1, difference is that what prehydrolysis adopts is the sulfuric acid of 0.2%, formic acid concentration is 75% during peroxyacid cooking, and hydrogen peroxide consumption is 3 %, the time is 30 min. And there is no chlorine dioxide bleaching stage in the bleaching process, that is, the EOP bleaching process is used for bleaching. The resulting dissolving pulp had a whiteness of 91% ISO, an α-cellulose content of 96.2%, an intrinsic viscosity of 745 ml / g and a pentosan content of 1.90%.

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Abstract

The invention relates to a production method of dissolving pulp. The method comprises the steps of pre-hydrolyzing plant fibrous raw materials by water, steam or diluted acid, then digesting the materials by peroxy acid, and processing the materials by hemicellulase, thus obtaining the dissolving pulp. The dissolving pulp produced by the method has the whiteness more than 90% ISO (International Standards Organization), and the content of Alpha-cellulose is more than 92%, and the content of pentosan is less than 2.0%. The method is applicable to wood and non-wood fibrous raw materials.

Description

technical field [0001] The present invention relates to a dissolving pulp production technology, in particular to a method for preparing dissolving pulp through oxyacid pulping, biological enzyme treatment and chemical bleaching after wood and non-wood fiber raw materials are pre-hydrolyzed with water or steam or dilute acid , belonging to the field of dissolving pulp production. Background technique [0002] Dissolving pulp is used to produce viscose fiber, cellophane, cellulose acetate, nitrocellulose, carboxymethyl cellulose, microcrystalline cellulose, cellulose ether and other products, and is widely used in textile, pharmaceutical, food and other industries. The raw materials used to produce dissolving pulp are non-wood fiber raw materials such as cotton linters, wood and bamboo. At present, the production of dissolving pulp is mainly through acid sulfite cooking or pre-hydrolysis and kraft cooking to obtain unbleached pulp, which is then bleached. Among them, the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 秦梦华李宗全傅英娟刘娜
Owner 济南绿泉新材料科技有限公司
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