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Preparation method of bamboo dissolving pulp

A technology for dissolving pulp and bamboo, applied in pulp bleaching, pulping with inorganic alkali, post-processing of cellulose pulp, etc., can solve the problems of increasing control and profit, limiting production cost, and difficult to exceed 30%-35%, etc. Achieve the effect of reducing energy consumption, realizing recycling and reducing corrosion

Inactive Publication Date: 2014-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In industrial production, although the production process of dissolving pulp is very mature, it is always difficult to obtain a product yield of more than 30%-35%, which greatly limits the control of production costs and the increase of profits for enterprises

Method used

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  • Preparation method of bamboo dissolving pulp

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Experimental program
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Effect test

Embodiment 1

[0026] A preparation method of bamboo dissolving pulp, the improved implementation steps are as follows: Bamboo slices are subjected to prehydrolysis with dilute acetic acid, kraft cooking, oxygen delignification, cold alkali extraction, D 0 -(E P )-D 1 Bleaching yields a dissolving pulp product. The specific process is shown in Table 1.

[0027] Table 1. Process conditions for making dissolving pulp

[0028]

[0029] The whiteness of the obtained dissolving pulp was 92.24% ISO, the α-cellulose was 93.16%, the intrinsic viscosity was 959ml / g, the content of pentosan was 5.23%, the ash content was 0.17%, and the yield was 37.26%.

Embodiment 2

[0031] As shown in Example 1, the difference is that the temperature of pre-hydrolysis is 170°C, and the holding time of sulfate cooking is 60min. The whiteness of the obtained dissolving pulp was 91.6% ISO, the α-cellulose was 95.74%, the intrinsic viscosity was 714ml / g, the content of pentosan was 4.11%, the ash content was 0.11%, and the yield was 31.12%.

Embodiment 3

[0033] As shown in Example 1, the difference is that the temperature of prehydrolysis is 150° C., and the holding time of sulfate cooking is 60 minutes. The whiteness of the resulting dissolving pulp was 89.84% ISO, the α-cellulose was 87.12%, the intrinsic viscosity was 951ml / g, the content of pentosan was 10.01%, the ash content was 0.19%, and the yield was 38.31%.

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Abstract

The invention discloses a preparation method of bamboo dissolving pulp. The preparation method disclosed by the invention comprises bamboos as the raw material and comprises the following steps: pre-hydrolyzing bamboo chips through diluted acetic acid, stewing the pre-hydrolyzed raw material with sulphate, processing pulp through oxygen delignification, extracting the pulp with cold caustic, bleaching with D0-(EP)-D1, and thus obtaining the bamboo dissolving pulp. The prepared bamboo dissolving pulp is more than 90% of ISO (International Standardization Organization) in whiteness, more than 92% in content of alpha-cellulose, 959 ml / g in intrinsic viscosity, 3.23% in content of pentosan, 0.11% in content of ash, and 38% in yield; compared with the yield of 30-35% in the common process currently, the yield of the bamboo dissolving pulp disclosed by the invention is at least increased by 3-8%, and therefore, the preparation method of the bamboo dissolving pulp disclosed by the invention has great economic benefit.

Description

technical field [0001] The invention relates to the technical field of pulping technology, in particular to a bamboo fiber dissolving pulp and a production technology thereof. Background technique [0002] Dissolving pulp, also known as special pulp, or refined pulp, is mainly used as viscose fiber for the production of textile raw materials. Raw materials for carboxymethyl cellulose, microcrystalline cellulose, cellulose ether and other products. Dissolving pulp is a relatively pure and uniform high-quality chemical pulp, and its α-cellulose content is 90% to 98%. The traditional raw materials for the production of dissolving pulp are coniferous wood and cotton linters. However, due to insufficient supply of domestic wood resources, and the price of cotton linters fluctuates greatly with the market, domestic dissolving pulp has been mainly dependent on imports for a long time. The largest amount of dissolving pulp is in the preparation of viscose fibers to produce rayon, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C1/04D21C9/147D21C9/16D21C9/10D21H11/12
Inventor 付时雨李广周爱静
Owner SOUTH CHINA UNIV OF TECH
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