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Method of preparing semi-chemical pulp with broadleaf wood slab

A semi-chemical pulp and wood board technology, applied in pulp beating method, fiber dispersant addition, paper and other directions, can solve the problems of strict requirements on reaction conditions, increase the difficulty of wastewater treatment, unfavorable clean production, etc., achieve rich raw materials, reagents Clean and free from contamination, lax specifications and quality requirements

Active Publication Date: 2018-06-29
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the use of lye to cook will produce black liquor, which will increase the difficulty of wastewater treatment and is not conducive to clean production
This method uses biological enzymes for pretreatment, but the price of enzymes is relatively expensive, and the requirements for reaction conditions are relatively strict.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method that present embodiment provides is that raw material prepares semi-chemical pulp with hardwood bark, comprises the steps:

[0031] (1) Pretreatment step: take the hardwood veneer as raw material, add ethanol aqueous solution and hydrolysis aid to form a cooking liquid; the cooking liquid is heated up to 160°C and kept for 120 minutes; the weight of the hydrolysis aid accounts for 3% by weight, the hydrolysis aid consists of NaOH and H 2 o 2 Composition, NaOH and H in the hydrolysis aid 2 o 2 The mass ratio of is 1.2:1; The volume fraction that ethanol accounts for in the ethanol aqueous solution is 40% in the pretreatment step; The weight of described ethanol aqueous solution is 6 times of hardwood bark weight;

[0032] (2) Refining step: the hardwood boards through the pretreatment step are directly refined without washing; in the refining step, a high-consistency refiner is used to perform two-stage refining operations, and the first stage refining gap ...

Embodiment 2

[0035] The difference between this embodiment and Example 1 is that the hydrolysis aid weight accounts for 3% of the hardwood board skin weight, and the hydrolysis aid consists of NaOH and H 2 o 2 It is composed according to the mass ratio of 1.2:1, the liquid ratio is 1:8, the volume concentration of ethanol in the ethanol aqueous solution is 60%, the cooking temperature is 160°C, and the heat preservation is 120 minutes. In the beating step, beating to beating degree is 28 o Sr.

Embodiment 3

[0037] The difference between this embodiment and Example 1 is that in the pretreatment step: the weight of the hydrolysis aid accounts for 5% of the weight of the hardwood board bark, and the aid is composed of NaOH and H 2 o 2 The composition is based on a weight ratio of 1.2:1, a liquid ratio of 1:6, a volume concentration of ethanol in an ethanol aqueous solution of 40%, a maximum cooking temperature of 160°C, and a heat preservation time of 180 minutes.

[0038] In the refining step, the refining concentration is 25%, and beating to a degree of beating in the beating step is 30% o Sr.

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PUM

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Abstract

The invention belongs to the technical field of pulping and papermaking and particularly relates to a method of preparing semi-chemical pulp with broadleaf wood slab. In the method, the broadleaf woodslab is used as a raw material and is pre-treated with alcohol; then through two-stage defibrination, washing and sieving, high-performance semi-chemical pulp is produced. In the method, the broadleaf wood slab, as the raw material, has abundant sources and is low in cost. With the alcohol as a main solvent for treating the broadleaf wood slab, alkali use amount is reduced, and cost of treating pulping black liquor is saved.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and in particular relates to a method for preparing semi-chemical pulp by using hardwood bark as a raw material. Background technique [0002] Due to the serious shortage of wood fiber resources in my country, the development of wood pulp and papermaking is slow, which seriously restricts the development of my country's paper industry. In addition, due to the shortage of wood pulp, the quality of paper, cardboard and paper products in my country is low, and structural contradictions are prominent. The supply of low-grade paper exceeds demand, and the gap between supply and demand of high-grade paper is relatively large. Some high-grade cultural paper, high-grade packaging paper and paper products have to rely heavily on imports. Commercial wood pulp that must be imported in large quantities from abroad every year. The vast majority of wood processing will produce a large number ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/08D21D1/02
CPCD21D1/02D21H21/08
Inventor 刘忠明孔凡功王守娟赵鑫夏南南
Owner QILU UNIV OF TECH
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