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Method for preparing bleached chemical thermomechanical pulp of eucalyptus and poplar mixture material

A technology of chemical thermal grinding machinery and mixed materials, which is applied in chemical/chemical mechanical pulping, pulping with inorganic alkali, and adding non-fibrous pulp. To solve the problem of insufficient wood resources, improve pulp quality indicators, and reduce the difficulty of fiber separation

Active Publication Date: 2011-09-14
山东晨鸣纸业集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main problem in the actual production of bleached chemical thermomechanical pulping technology is that the energy consumption of pulping is high, which usually accounts for about 1 / 3 of the production cost, which is not conducive to reducing costs and saving energy for enterprises.
[0005] Bleached chemical thermomechanical pulp generally uses poplar as raw material, and poplar is mostly in the northern region, with a long growth cycle and insufficient resources, which cannot meet the large demand for wood raw materials in the paper industry
As the wood grows in the south where the rain is abundant, its growth is fast, the cycle is short, and the resources are abundant, but its material is dark in color and the whiteness of the pulp fiber is low. It is difficult to meet the quality requirements of high-grade paper when it is used alone to prepare pulp
[0006] However, in actual production, due to relatively thin poplar fibers, thin walls, and soft fibers; relatively thick eucalyptus fibers, thick walls, and hard fibers, it is difficult to control the degree of extrusion and loosening during the refining process. The speed also varies greatly, which will lead to a higher content of fiber bundles in the pulp, so it is relatively difficult to prepare bleached chemical thermomechanical pulp by mixing them

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) The weight ratio is the swelling agent ZnCl 2 40%: penetrating agent fatty alcohol polyoxyethylene ether phosphate 60%, mixed evenly to obtain a refining accelerator, for later use;

[0063] (2) Raw material pretreatment: poplar wood chips and eucalyptus wood chips are mixed uniformly at a ratio of 40%: 60% by weight, and sent to the wood chip storage bin. NaOH, react for 15 minutes, add water to wash, enter the concentration tank, dehydrate through inclined spiral, and control the moisture content of wood chips at 45%;

[0064] (3) Pre-steaming: In the pre-steaming chamber, add NaOH with a concentration of 30%, so that the weight of absolute dry wood chips is 0.5%, mix evenly, control the temperature at 85 ° C, and pre-steam for 15 minutes;

[0065] (4) One-time extrusion and decompression: add the pre-steamed wood chips into clear water, the liquid ratio is 1:2.5, mix well, then add separately: then add separately: refining accelerator, the dosage is 0.2 to the w...

Embodiment 2

[0081] (1) The weight ratio is the swelling agent ZnCl 2 48%: penetrating agent sodium butyl naphthalene sulfonate 52%, mixed evenly to obtain a refining accelerator, for subsequent use;

[0082] (2) Raw material pretreatment: with poplar wood chip and eucalyptus wood chip, be 50%: 50% by weight, mix uniformly, send into wood chip storage bin, add concentration and be 31%, to dry wood chip weight be 1.2% NaOH, react for 20 minutes, add water to wash, then enter the concentration tank, dehydrate through inclined spiral, and control the moisture content of wood chips at 40%;

[0083] (3) Pre-steaming: In the pre-steaming chamber, add NaOH with a concentration of 31%, so that the absolute dry wood chip weight is 0.6%, mix evenly, control the temperature at 90 ° C, and pre-steam for 20 minutes;

[0084] (4) Extrusion once: add the pre-steamed wood chips into clear water, the liquid ratio is 1:2, after mixing evenly, add respectively: the refining accelerator prepared in step (1),...

Embodiment 3

[0101] (1) The weight ratio is the swelling agent ZnCl 2 45%: penetrating agent alkyl phosphate 55%, mixed evenly to obtain a refining accelerator, set aside;

[0102] (2) Raw material pretreatment: with poplar wood chip and eucalyptus wood chip, be 60%: 40% by weight, mix evenly, send into wood chip storage bin, add concentration and be 32%, to dry wood chip weight be 1.5% NaOH, react for 16 minutes, add water to wash, enter the concentration tank, dehydrate through inclined spiral, and control the moisture content of wood chips at 45%;

[0103] (3) Pre-steaming: In the pre-steaming chamber, add NaOH with a concentration of 32%, so that the absolute dry wood chip weight is 0.9%, mix evenly, control the temperature at 86 ° C, and pre-steam for 17 minutes;

[0104] (4) Extrusion once: add the pre-steamed wood chips into clear water, the liquid ratio is 1:2.1, after mixing evenly, add respectively: the refining accelerator prepared in step (1), the dosage is 0.21% by weight; H...

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Abstract

The invention belongs to the technical field of preparing bleached chemical thermomechanical pulp and in particular relates to a process method for preparing the bleached chemical thermomechanical pulp from eucalyptus and poplar. The process method adopts the eucalyptus and the poplar as raw materials to prepare the bleached chemical thermomechanical pulp; through the addition of a pulp grinding accelerant, the process reduces energy consumption of pulp grinding by 10 to 15 percent compared with the prior process for the bleached chemical thermomechanical pulp, reduces production cost, saves energy and simultaneously reduces the content of pulping fasciculus.

Description

technical field [0001] The invention belongs to the technical field of preparing bleached chemical thermomechanical pulp, in particular to a process method for preparing bleached chemical thermomechanical pulp from eucalyptus and poplar. Background technique [0002] With the increase of domestic paper and cardboard production capacity, the shortage of papermaking raw materials has become increasingly prominent. Wood pulp fiber has to rely on a large amount of imports. The price of raw materials is subject to foreign suppliers, which seriously affects the economic benefits of enterprises and restricts the development of the industry. The fiber yield of traditional chemical pulp production is only 50%-55%, while the bleaching chemical thermomechanical pulping technology can achieve a fiber yield of more than 85%, which is about 70% higher than the traditional chemical pulp wood utilization efficiency. Therefore, the development of bleaching chemical Thermomechanical pulping t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/02D21C1/02D21C3/02D21H21/00
Inventor 陈洪国尹同远耿光林方辉张革仓王勇
Owner 山东晨鸣纸业集团股份有限公司