Method of preparing bleached chemical pulp using cotton stalk

A chemical pulping and pulping technology, which is applied in pulp bleaching, pulping with inorganic alkali, pretreatment with alkaline compounds, etc., can solve problems such as unsatisfactory effects, and alleviate the shortage of wood resources, low COD index, reduce The effect of water dosage

Active Publication Date: 2008-04-16
SHANDONG TRALIN PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the effect is not ideal

Method used

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  • Method of preparing bleached chemical pulp using cotton stalk
  • Method of preparing bleached chemical pulp using cotton stalk
  • Method of preparing bleached chemical pulp using cotton stalk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Cotton stalk pulp cooking cost analysis:

[0040]

[0041] A total of 7 balls were produced in the test, with an output of 11.0644 tons, a dry cotton stem consumption of 29.32 tons, and a harvest rate of 37.74%.

experiment example 1

[0043] Cotton stalk cooking operation record data sheet:

[0044]

[0045] Cotton stalk secondary cooking operation record data sheet:

[0046]

[0047]

[0048] The average length of the cotton stalk fiber is 2.0mm, and the average diameter is 20um; the average length of the woody core fiber is 0.74mm, and the average diameter is 16um; the phloem of the cotton stalk contains more pectin, and it can be seen in the process that the pectin is degraded There is a large amount of starch in the slurry, and there is no need to add starch indicator when testing the hardness; therefore, it is best to store the cotton stalks for more than half a year before use, so as to facilitate natural fermentation and save cooking alkali.

[0049] When the cotton stalks are directly cooked, the lye is not easy to penetrate, and the raw materials should be crushed or crushed, which is conducive to improving the lye’s penetration ability, making the cooking more uniform, and greatly reducing ...

experiment example 2

[0051] Bleach data:

[0052]

[0053] Pool No. 1 is primary cooking slurry, and the rest are secondary cooking slurry. In order to ensure the whiteness and color stability of slurry, the amount of bleaching liquid in the next few pools has increased; under laboratory conditions, the bleached slurry has a large amount of Dust, therefore, bleaching is the focus of this test, and the hardness is also intentionally reduced during cooking. From the results, cotton stalk pulp is easier to bleach than expected. After chlorine treatment, the final whiteness can reach more than 78%.

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Abstract

The present invention discloses a method for preparing bleached chemical pulp by using cotton stalk. The described method is an alkaline process, and includes the following steps: preparing material, impregnating treatment, first cooking or secondary cooking to obtain crude pulp, then washing pulp, bleaching so as to obtain the finished paper.

Description

Technical field: [0001] The invention relates to a method for preparing bleached chemical pulp from cotton stalks, belonging to the technical field of papermaking and pulping. Background technique: [0002] Due to the rapid development of the paper industry, there has been an unprecedented shortage of raw materials for the paper industry. Therefore, as a major cotton-producing country, it is particularly important for my country to develop new raw materials for papermaking and pulping. Xinjiang, Gansu, Shanxi, Shandong, Henan, and Shaanxi are all rich in raw materials. Cotton stalk resources can be used for papermaking. [0003] Cotton stalks are used as papermaking raw materials, and cotton stalk pulp is usually prepared by soaking, cooking and washing the cotton stalks and refining them in a cold grinder or chemical pulping. But the effect is not ideal. [0004] In order to effectively utilize cotton stalk raw materials, it is necessary to study new cotton stalk pulping m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C1/06D21C9/10
Inventor 曹振雷孙立军宋明信杨吉慧李洪法陈松涛
Owner SHANDONG TRALIN PAPER
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