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Pulping method of special pulp

A technology of pulping and pulping, which is applied in pulping with inorganic alkali, pulping of cellulose raw materials, textiles and papermaking, etc., can solve the problems of inability to produce high-viscosity dissolving wood pulp, and prevent lignin condensation and desorption The effect of removing lignin and protecting cellulose

Active Publication Date: 2015-05-20
中国制浆造纸研究院衢州分院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the large European and American factories use soluble bases, and there are very few domestic researches in this area, and it is impossible to produce high-viscosity dissolving wood pulp

Method used

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  • Pulping method of special pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 20L of factory water into the cooking liquid preparation bottle, weigh 300g of ammonium bicarbonate, dissolve in the factory water, shake to accelerate the dissolution, introduce sulfur dioxide gas, control the gas flow, shake properly, accelerate the uniform dissolution reaction of the base, and promote the escape of carbon dioxide. Measure the total acid and free acid of the cooking liquid, and calculate the combined acid until the total acid is 6%, the combined acid is 1.5%, and the introduction of sulfur dioxide is stopped;

[0028] Selection of cooking raw materials The cooking raw materials are good radiata pine materials, the slice specifications are 12-17mm in length, 2-4mm in thickness, and the width has little influence. Remove larger wood chips and sawdust, wash the wood chips with factory water, remove non-fibrous impurities, and keep the wood chips The water content is 60%, which accelerates the penetration of the medicinal liquid, which is beneficial to...

Embodiment 2

[0032] Add 20L of factory water into the cooking liquid preparation bottle, weigh 320g of sodium carbonate, dissolve in the factory water, shake to accelerate the dissolution, introduce sulfur dioxide gas, control the gas flow, shake properly, accelerate the uniform dissolution reaction of the base, promote the escape of carbon dioxide, and measure For the total acid and free acid of the cooking liquid, the combined acid is calculated until the total acid is 5.9% and the combined acid is 1.4%, and the introduction of sulfur dioxide is stopped;

[0033] The raw material for cooking is radiata pine leftovers. The length of the slices is 12-17mm, the thickness is 2-4mm, and the width has little effect. Remove larger wood chips and sawdust, wash the wood chips with factory water, remove non-fibrous impurities, and keep the wood chips at 59% moisture. , to accelerate the penetration of the liquid medicine, which is beneficial to the early stage of cooking;

[0034] The amount of wo...

Embodiment 3

[0037] Add 20L of factory water into the cooking liquid preparation bottle, weigh 280g of ammonium bicarbonate, dissolve in the factory water, shake to accelerate the dissolution, introduce sulfur dioxide gas, control the gas flow, shake properly, accelerate the uniform dissolution reaction of the base, and promote the escape of carbon dioxide. Measure the total acid and free acid of the cooking liquid, calculate the combined acid, until the total acid is 6%, the combined acid is 1.4%, stop feeding sulfur dioxide;

[0038] The raw material for cooking is radiata pine. The length of slices is 12-17mm, the thickness is 2-4mm, and the width has little effect. Larger wood chips and sawdust are removed, and the wood chips are washed with factory water to remove non-fibrous impurities, so that the water content of the wood chips is kept at 55%. , to accelerate the penetration of the liquid medicine, which is beneficial to the early stage of cooking;

[0039]The amount of wood chips ...

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Abstract

The invention discloses a pulping method of special pulp, and belongs to the technical field of pulp and paper making engineering. A sulfite stewing liquid is prepared from soluble base ammonium salt or sodium salt; and the special pulp is produced by using good timbers and leftover materials of monterey pine. The production technology comprises the following steps: (1) preparing the stewing liquid, which contains 3%-6% of total acid and 0.8%-1.5% of combined acid; (2) selecting a material and washing wood chips; (3) stewing in a pot, pressurizing and loading in the pot, and stewing in two stages; and (4) terminal point determination, namely determining according to reacted acid and color of a red liquid, wherein the polymerization degree of the produced pulp is greater than 2,000; the bleachability is 30%-50%; and the yield of screened pulp is 44%-55%. The requirements of high-viscosity products produced by cellulose ether and cellulose ester manufacturers can be met by bleaching; and the domestic blank is filled up.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking engineering, and in particular relates to a pulping method of special pulp. Background technique [0002] Most foreign dissolving pulp enterprises are large-scale comprehensive groups with large production scale and many years of experience in producing dissolving pulp. Generally, they have their own fast-growing forest land. The raw materials are stable and the price is cheap. The quality of dissolving pulp products is very stable and the production cost is low. In addition, stimulated by the sharp increase in demand for dissolving pulp in my country, these enterprises have expanded their production scale in recent years. The rising domestic demand for dissolving pulp has stimulated many pulp mills to put into production dissolving pulp projects. During the peak price period, viscose fiber enterprises and pulping enterprises use papermaking wood pulp and further process it into di...

Claims

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Application Information

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IPC IPC(8): D21C3/02
CPCD21C3/022
Inventor 周立春熊钢刘文郑艳民金昌寿赵丽君陈雪峰王月江黄小雷贾程瑛
Owner 中国制浆造纸研究院衢州分院
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