Method for preparing dissolving pulp used for viscose fiber by using mulberry twig stem core

A viscose fiber, dissolving pulp technology, applied in the direction of pulping with acid salt/acid anhydride, post-treatment of cellulose pulp, natural cellulose pulp/paper, etc., can solve the uneven reaction, affect the quality and yield, and increase the cost and other problems, to achieve the effect of reducing the content of CODcr, alleviating the shortage of production raw materials, and reducing the cost of sewage treatment

Active Publication Date: 2012-06-27
潍坊欣龙生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, mulberry branches are used for pulping with whole stems. However, using the same process to treat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing dissolving pulp for viscose fibers by adopting a mulberry bar core, the specific operations are as follows:

[0028] (1) Material preparation: cut the rod core into 5cm-long segments, and then crush them with a crushing pressure of 0.30MPa;

[0029] (2) Steaming: the rod core after the material preparation in the above step (1) enters the steaming chamber, the heating time is 25 minutes, and it is treated at 0.20MPa and 115°C for 60 minutes. After steaming, the content of pentosan is 4.85%, and the content of lignin is 5.84 %;

[0030] (3) Washing material: washing water temperature 50 ℃, wash 3 times;

[0031] (4) Concentration: Send the washed slurry to the press for concentration, the pressing pressure is 0.15MPa, and the pressed wastewater and washing wastewater are filtered by membrane and then discharged to the sewage treatment plant;

[0032] (5) Cooking: The ratio of cooking liquid is 1:2.5, the concentration of alkali mixed with NaOH is...

Embodiment 2

[0040] A method for preparing dissolving pulp for viscose fibers by adopting a mulberry bar core, the specific operations are as follows:

[0041] (1) Material preparation: Cut the rod core into sections with a length of about 5cm, and then crush it with a crushing pressure of 0.40MPa;

[0042] (2) Steaming: The rod core after the material preparation in the above step (1) enters the steaming chamber, the heating time is 30min, and the treatment is at 0.30MPa, 128°C for 50min. After steaming, the content of pentosan is 3.52%, and the content of lignin is 4.95%;

[0043] (3) Washing material: washing water temperature 50 ℃, wash 3 times;

[0044] (4) Concentration: send the washed slurry to the press for concentration, and the pressing pressure is 0.20MPa; filter the pressed wastewater and washing wastewater through membrane and then discharge to the sewage treatment plant;

[0045](5) Cooking: The ratio of cooking liquid is 1:3.0, the concentration of the alkali is 40g / L in ...

Embodiment 3

[0053] (1) Material preparation: cut the rod core into sections about 5cm long, and then crush it with a crushing pressure of 0.60MPa;

[0054] (2) Steaming: the above step (1) the rod core after the material preparation process enters the steaming chamber, the heating time is 35min, and the treatment is at 0.35MPa, 130°C for 40min. After steaming, the content of pentosan is 2.08%, and the content of lignin is 5.01% %;

[0055] (3) Washing material: washing water temperature 60 ℃, wash 2 times;

[0056] (4) Concentration: send the washed slurry to the press for concentration, and the pressing pressure is 0.25MPa; the pressed wastewater and washing wastewater are filtered by membrane and then discharged to the sewage treatment plant;

[0057] (5) Cooking: The ratio of cooking liquid is 1:3.5, the concentration of alkali mixed with NaOH is 50g / L, and the amount of alkali used is 12% of the mass of dry material in terms of NaOH; the second heating method is adopted, and the temp...

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PUM

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Abstract

The invention discloses a method for preparing a dissolving pulp used for viscose fiber by using a mulberry twig stem core, which comprises the following steps: preparing raw materials, steaming, washing the raw materials, concentrating, boiling, extruding pulp, screening, alkali refining, bleaching, carrying out acid treatment, washing, second cleaning, pulping to prepare the finished pulp. The method of the invention has the advantages that the method for preparing the dissolving pulp by using the mulberry twig stem core avoids the problem that the product quality and yield can be influenced by over violent or insufficient boiling condition which is caused by the different structures of the mulberry twig and the mulberry twig stem core during the whole stem pulping process. The method of the invention is capable of increasing the charge amount of a boiling device, reducing the subsequent boiling strength, reducing the pollution and effectively alleviating a shortage problem of raw materials used for producing viscose fiber in the prior art.

Description

technical field [0001] The invention relates to a method for preparing dissolving pulp, in particular to a method for preparing dissolving pulp for viscose fiber by using mulberry twig cores, and belongs to the technical field of dissolving pulp manufacturing. Background technique [0002] The proportion of textile fiber consumption has grown tremendously in the past 200 years, especially in the past 30 years. However, the growth of textile fiber raw materials is facing many difficulties. Cellulose viscose fiber is a kind of fiber that people use very widely at present, and the raw material that is used to produce cellulose viscose fiber, mostly take coniferous wood, hardwood or cotton linter as main raw material. Due to the pressure of the global population on food demand, it is impossible to increase the sown area of ​​cotton fields in the future, and there is little room for growth in output per unit area. The wood pulp and cotton linter pulp required for regenerated ce...

Claims

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Application Information

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IPC IPC(8): D21H11/00D21B1/02D21C1/02D21C1/00D21C3/04D21D5/02D21C9/00D21C9/18D21C9/12
Inventor 王乐军马君志秦翠梅姜明亮王东吴亚红李昌垒郝连庆
Owner 潍坊欣龙生物材料有限公司
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