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Bleaching method of cotton stalk chemical pulp

A technology of chemical pulp and cotton stalks, which is applied in pulp bleaching, chemical/chemical mechanical pulping, pulping with inorganic alkali, etc., can solve the problems of unsatisfactory pulp whiteness, etc., and achieve the goal of alleviating the shortage of wood resources and good bleaching performance 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 for cotton stalk pulp, its pulp whiteness is often not ideal, so, in order to effectively utilize cotton stalk resources, it is necessary to study a new cotton stalk pulp bleaching method

Method used

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  • Bleaching method of cotton stalk chemical pulp
  • Bleaching method of cotton stalk chemical pulp
  • Bleaching method of cotton stalk chemical pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Yield

[0045] Electricity

[0046] 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

[0048] A cooking operation record data sheet:

[0049]

[0050] Secondary cooking operation record data sheet:

[0051]

[0052] A small deflation time min

10

10

10

10

Second heating time min

40

40

40

40

Static pressure black liquor discharge time min

90

90

90

90

Secondary alkali addition min

20

20

20

20

three heating min

60

60

40

40

Second holding time min

110

130

100

100

test

Discharge time min

20

20

15

15

full time

8:00

8:30

7:45

7:55

Cooking residual alkali g / l

17.8

19.22

20.59

21.21

Hardness k value

12.2

13.4

15

11.8

Horizontal band percussion

25

23

22

23

horizontal with wet weight...

experiment example 2

[0057] Drift Pond

[0058] Bleaching end time

[0059] Pool No. 1 is primary cooking pulp, and the rest are secondary cooking pulp. The pulp whiteness after bleaching is: 78.9%, 79.7%, 82.0%, and 80.2%.

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Abstract

The present invention provides a bleaching method of cotton stalk chemical pulp. The described paper pulp to be bleached is obtained by using cotton stalk as fibre raw material through alkaline process. Before multistage bleaching operation a thermophilic fatty bacillus is added into the paper pulp to make pretreatment, and its added quantity is 5-50g / cu.m, and the bacterial strain number is AS 1.999. The whiteness of bleached pulp can be up to above 78%.

Description

Technical field: [0001] The invention relates to a method for bleaching cotton stalk chemical pulp, belonging to the technical field of papermaking and pulping. Background technique: [0002] The whiteness of pulp is the main quality index of pulp. The pulp bleaching method was the earliest oxygen bleaching in the era of handicraft production. It was not until the Swedish chemist K.W. Sheele discovered chlorine gas and its powerful bleaching effect in 1774 that chlorine bleaching technology was used in textile and papermaking. Initial bleaching results with the chlorine bleaching technique were not good and the finished product was severely damaged. [0003] French chemist Berthollet found that potassium hydroxide (KOH) had a better bleaching effect after absorbing chlorine gas, and had little damage to the finished product. Potassium hypochlorite (KCIO) has been used to bleach textiles since 1789. A few years later, another French chemist, Labarraque, discovered that a ...

Claims

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Application Information

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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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