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Method for producing dissolving pulp by using poplar slabs

A technology for dissolving pulp and skin, applied in pulping with inorganic alkali, pulp bleaching, post-treatment of cellulose pulp, etc., to achieve the effect of clean production process

Active Publication Date: 2013-02-06
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The main raw material for domestic dissolving pulp production is cotton linters, but due to the increase in viscose production in recent years, the demand for raw materials has increased, and cotton linters have met To meet the demand of the chemical fiber industry, it is imperative to develop new raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 500g of poplar veneer from a certain factory, length 10-30mm, its polypentose content is 24.3%, iron content is 120ppm, α-cellulose content is 43.0%, use this poplar veneer to produce dissolving pulp, the steps are as follows :

[0031] (1) Pre-hydrolysis with addition of hydrolysis aid: add water and hydrolysis aid to poplar veneer, the amount of hydrolysis aid accounts for 0.2% of the weight of poplar veneer, the maximum hydrolysis temperature is 165℃, the holding time is 120 minutes, and the hydrolysis aid It is obtained by mixing boric acid and sulfuric acid at a mass ratio of 1:1, the content of polypentose after pre-hydrolysis is 7.8%, and the hydrolysis yield is 72%;

[0032] (2) KP / AQ cooking: the amount of alkali used is 24% of the absolute dry pulp mass, the degree of vulcanization is 5%, the AQ dosage is 0.05% of the absolute dry pulp mass, Tmax=165℃±5℃, the heating time is 70 minutes, Holding time 120 minutes;

[0033] (3) O P QP drift

[0034] O P The oxygen...

Embodiment 2

[0042] The polypentose content of poplar veneer is 22.3%, the iron content is 90ppm, and the α-cellulose content is 45.0%. The dissolving pulp is produced using this poplar veneer, the steps are as follows:

[0043] (1) Pre-hydrolysis with addition of hydrolysis aid: add water and hydrolysis aid to poplar veneer, the amount of hydrolysis aid accounts for 2% of the weight of poplar veneer, the maximum hydrolysis temperature is 150℃, the holding time is 180 minutes, the hydrolysis aid It is obtained by mixing boric acid and sulfuric acid at a mass ratio of 1:1, the content of polypentose after pre-hydrolysis is 7.6%, and the hydrolysis yield is 74%;

[0044] (2) KP / AQ cooking: the amount of alkali used is 20% of the absolute dry pulp mass, the degree of vulcanization is 2.5%, the amount of AQ is 0.05% of the absolute dry pulp mass, Tmax=165℃±2℃, the heating time is 30 minutes, Holding time 180 minutes;

[0045] (3) O P QP drift

[0046] O P The oxygen pressure of bleaching is 0.4Mpa, H...

Embodiment 3

[0054] The polypentose content of poplar veneer is 23%, the iron content is 100ppm, and the α-cellulose content is 44%. The dissolving pulp is produced from this poplar veneer. The steps are as follows:

[0055] (1) Pre-hydrolysis with addition of hydrolysis aid: add water and hydrolysis aid to poplar veneer, the amount of hydrolysis aid is 0.5% of the weight of poplar veneer, the maximum hydrolysis temperature is 170℃, the holding time is 90 minutes, the hydrolysis aid It is obtained by mixing boric acid and sulfuric acid at a mass ratio of 1:1, the content of polypentose after pre-hydrolysis is 7.8%, and the hydrolysis yield is 73%;

[0056] (2) KP / AQ cooking: the amount of alkali used is 30% of the absolute dry pulp mass, the vulcanization degree is 10%, the amount of AQ is 0.05% of the absolute dry pulp mass, Tmax=165℃±2℃, the heating time is 90 minutes, Keep holding time 90 minutes;

[0057] (3) O P QP drift

[0058] O P The oxygen pressure for bleaching is 0.5Mpa, H 2 O 2 The d...

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Abstract

The invention relates to the technical field of production of dissolving pulp, in particular to a method for producing the dissolving pulp by using poplar slabs. The method comprises the following steps: (1) prehydrolysis through addition of a hydrolyzing auxiliary agent; (2) KP / AQ steam cooking; (3) OPQP bleaching; and (4) enzyme treatment, wherein the specific steps are as follows: firstly, by means of prehydrolysis through the addition of the hydrolyzing auxiliary agent, greatly dissolving out hemicellulose in the poplar slabs; and finally, further reducing the hemicellulose in the poplar slabs through the enzyme treatment, and preparing the poplar slab dissolving pulp with high alpha-cellulose content, low pentosan content and high reaction performance through combination of KP / AQ steam cooking and OPQP bleaching; and the used chemicals are clean and environment-friendly and the production process is clean.

Description

technical field [0001] The invention relates to the technical field of dissolving pulp production, in particular to a method for producing dissolving pulp by using poplar veneer. Background technique [0002] In recent years, the demand for dissolving pulp has increased rapidly. In 2010, the demand for dissolving pulp in the world has reached 4.5 million tons. Dissolving pulp is a kind of refined chemical pulp, which has the characteristics of high content of α-cellulose, good reactivity, high whiteness and low content of pentosan. It can be used as raw materials for viscose fiber, cellophane, acetate fiber, enteric-coated tablet sugar coating, cigarette filter, carboxymethyl cellulose and nitrocellulose. The textile industry and tobacco manufacturing industry are the main application fields of dissolving pulp. The proportion is roughly: viscose products 60%, cigarette filters 16%, cellulose ether 11%, nitrocellulose 5%, acetate cellulose 7%, and others 1%. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21H11/00D21C9/147D21C9/16D21C9/00
Inventor 吴朝军赵传山于冬梅王代启韩文佳周淑芳邴丽娟
Owner QILU UNIV OF TECH
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