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Pulping method of high-yield coniferous wood dissolving pulp and dissolving pulp prepared by pulping method

A technology for coniferous wood and dissolving pulp, which is applied in the direction of pulping with inorganic alkali, pulp bleaching, digester, etc., can solve the problems of scaling on the inner wall of hydrolysis equipment, increase in cost, etc., so as to improve the risk resistance ability, easy operation, and increase products. The effect of diversity

Inactive Publication Date: 2018-11-23
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, during the prehydrolysis process, because the prehydrolysis temperature is relatively high (generally 170°C), a series of chemical reactions will occur in the acid-soluble lignin and degraded carbohydrates in the plant fiber raw materials to form viscous products, resulting in Severe scaling on the inner wall of the hydrolysis equipment
Therefore, it is necessary to develop a new dissolving pulp cooking and bleaching process to avoid the problem of increased cost caused by the treatment of waste liquid generated in the pre-hydrolysis stage and the removal of reactor scale

Method used

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  • Pulping method of high-yield coniferous wood dissolving pulp and dissolving pulp prepared by pulping method

Examples

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Embodiment 1

[0033] The present embodiment takes radiata pine as the research object, and the pulping method of the high-yield softwood dissolving pulp provided comprises the following steps carried out in order:

[0034] Kraft cooking steps:

[0035] 1) Remove the knots from the radiata pine log, peel it, cut it into 15-30mm long and 3-5mm thick wood chips, air-dry and mix well, then balance the moisture for subsequent cooking;

[0036] 2) The cooking liquid is prepared and mixed with wood chips; wherein, the cooking liquid is a mixed solution of sodium hydroxide, sodium sulfide, sodium dodecylbenzenesulfonate and water.

[0037] 3) Low-temperature pre-impregnation: put the wood chips and cooking liquid into the digester, and perform pre-impregnation at a temperature of 25°C. The amount of alkali used is 36% (NaOH), the degree of sulfide is 25%, and the liquid ratio is 1:5. The dosage of sodium dialkylbenzene sulfonate is 0.05%, and it is pre-impregnated for 90 minutes to make half mater...

Embodiment 2

[0040] The present embodiment takes radiata pine as the research object, and the pulping method of the high-yield radiata pine dissolving pulp provided comprises the following steps carried out in order:

[0041] Kraft cooking steps:

[0042] 1) Remove the knots from the radiata pine log, peel it, cut it into 15-30mm long and 3-5mm thick wood chips, air-dry and mix well, then balance the moisture for subsequent cooking;

[0043] 2) mixing the prepared cooking liquid with wood chips; wherein, the cooking liquid is a mixed solution of sodium hydroxide, sodium sulfide, sodium dodecylbenzenesulfonate and water.

[0044] 3) Low-temperature pre-impregnation: put the wood chips and cooking liquid into the digester, and perform pre-impregnation at a temperature of 25°C. The amount of alkali used is 32% (calculated by NaOH), and the degree of sulfide is 25%; the liquid ratio is 1:5, ten The dosage of sodium dialkylbenzene sulfonate is 0.05%, and it is pre-impregnated for 90 minutes to...

Embodiment 3

[0047] The present embodiment takes Masson pine as the research object, and the pulping method of the high-yield softwood dissolving pulp provided comprises the following steps carried out in order:

[0048] Kraft cooking steps:

[0049] 1) Remove the knots from the masson pine log, peel it, cut it into 15-30mm long and 3-5mm thick wood chips, air-dry and mix well, balance the water, and prepare for subsequent cooking;

[0050] 2) The cooking liquid is prepared and mixed with wood chips; wherein, the cooking liquid is a mixed solution of sodium hydroxide, sodium sulfide, sodium dodecylbenzenesulfonate and water.

[0051] 3) Low-temperature pre-impregnation: put the wood chips and cooking liquid into the digester, and perform pre-impregnation at a temperature of 25°C. The amount of alkali used is 32% (calculated by NaOH), and the degree of sulfide is 25%; the liquid ratio is 1:5, ten The dosage of sodium dialkylbenzene sulfonate is 0.05%, and it is pre-soaked for 120 minutes t...

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Abstract

The invention provides a pulping method of high-yield coniferous wood dissolving pulp. The pulping method sequentially comprises the steps of cooking liquor presoaking, sulfate process cooking, cold alkali extraction and elemental chlorine free bleaching for the coniferous wood raw material, wherein the cooking liquor presoaking temperature is 20-100 DEG C, and the sulfate process cooking temperature is 170-185 DEG C. Compared with the traditional prehydrolyzed sulfate bleachable pulp, only a cold alkali extraction section needs to be added before bleaching of the prepared high-temperature sulfate dissolving pulp to reduce the polypentose content to a suitable level, and the waste liquor of the cold alkali extraction section can be reused in the cooking stage so as to avoid cost increase.The process is universal for production of the dissolving pulp in a pulp mill having sulfate process pulping production lines, and different grades of pulp can be produced on the same production lineonly by changing the cooking strength to realize conversion of the produced pulp between paper pulp and dissolving pulp, so as to increase the product diversity of enterprises, so that the enterprisescan produce the pulp in different purposes at any time according to changes in the market so as to enhance the anti-risk capability of the enterprises.

Description

technical field [0001] The invention relates to the field of pulping and papermaking industry, in particular to a pulping method for dissolving softwood pulp with high yield. Background technique [0002] my country is a big country in textile production, and its annual average textile fiber output ranks first in the world. However, limited by land resources, conflicts between grain and cotton, and urban and rural areas have become increasingly prominent. Natural fibers such as cotton and hemp are difficult to meet the development needs of the textile industry. The growth of fiber consumption will still be mainly supported by the growth of chemical fibers. However, the petrochemical products used as raw materials for chemical fibers are increasingly in short supply and their prices continue to rise, which hinders the sustainable development of the textile industry from the source. In order to fundamentally solve the adverse effects of the shortage of petroleum resources on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C7/00D21C9/14
CPCD21C3/02D21C7/00D21C9/14
Inventor 刘秋娟何亮
Owner TIANJIN UNIV OF SCI & TECH
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