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Method of preparing bleached chemical pulp using cotton stalk

A chemical pulping and pulping technology, used in chemical/chemical mechanical pulping, pulp bleaching, pulping with inorganic alkali, etc., can solve problems such as unsatisfactory effects, alleviate the shortage of wood resources, easy to wash, and high extraction rate Effect

Active Publication Date: 2006-01-11
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] Yield

[0040] 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

[0042] Cotton stalk cooking operation record data sheet:

[0043]

[0044]

Alkali

operate

Caustic soda concentration g / l

400

400

Alkali concentration g / l

78.8

AQ dosage%

0.1

0.1

Actual alkali consumption%

29

23

cook

operate

Dry running time min

20

20

One heating time min

40

40

Minimum deflation time min

20

20

Second heating time min

40

40

Holding time min

95

75

Discharge time min

25

25

test

black liquor residual alkali g / l

14.88

16.43

Hardness k value

10.5

12.7

Horizontal band percussion

23

26

horizontal with wet weight

2.0

2.5

Horizontal belt hardness

14

horizontal ...

experiment example 2

[0051] Floating Pond

[0052] 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 Applications(China)
IPC IPC(8): D21C9/10D21C3/02D21H11/02D21B1/04D21C9/00
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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