Cotton stalk pulping process with high whiteness of pulp

A cotton stalk and pulping technology, which is applied in the field of pulp production, can solve the problems of waste of cotton stalk resources, achieve the effects of increasing income, making full use of resources, and solving the shortage of fiber raw materials

Inactive Publication Date: 2006-10-18
XINJIANG BOHU REED IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in many rural areas, cotton stalks are not used, and the cotton stalks are burned in the fields as agricultural waste, and the rich cotton stalk resources are wasted in vain.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, a pulping method for improving the whiteness of cotton stalk pulping is carried out according to the following steps: 1. The cotton stalk is crushed with a leather stem separator, and the outer skin and the pith of the heart of the cotton stalk are removed at the same time; 2. 1. Put the crushed cotton stalk raw materials into the cooking equipment, add water and chemicals for cooking, and the chemicals are NaOH, NaOH 2 SO 3 And green oxygen, wherein: the weight ratio of adding raw material and water is 1: 5.0, adding NaOH is 15% of raw material weight, adding NaOH 2 SO 3 5% of the weight of the raw material, adding green oxygen as 0.02% of the weight of the raw material, the degree of vulcanization is 20%, the cooking time is 40min, the steam pressure is 0.5Mpa, and the temperature is 120°C; 3. Wash with water to remove the cotton stalk pulp Dissolved impurities; 4, enter the chlorination section, add chlorine gas to the cotton stalk pulp to be bleached...

Embodiment 2

[0014] Repeat the same steps as described in Example 1, but wherein the weight ratio of raw materials and water added in step 2 is 1: 4, adding NaOH is 25% of the raw material weight, adding NaOH 2 SO 3 8% of the raw material weight, add anthraquinone as 2.5% of the raw material weight, the degree of sulfidation is 25%, the cooking time is 350min, the steam pressure is 0.8Mpa, and the temperature is 160°C; the amount of chlorine in step 4 is 6% of the cotton stalk pulp weight , the concentration of cotton stalk pulp is 4.0%, and the temperature is 40°C; the amount of NaOH added in step 5 is 5% of the weight of cotton stalk pulp, H 2 o 2 The dosage is 3% of the weight of the cotton stalk pulp, the concentration of the cotton stalk pulp is 12%, and the temperature is 60°C; the amount of hypochlorite added in step 6 is 4% of the weight of the cotton stalk pulp, and the amount of adding NaOH is 4% of the weight of the cotton stalk pulp. The pulp weight is 2.5%, the cotton stalk ...

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Abstract

The cotton stalk pulping process with high pulp whiteness includes the following steps: crushing cotton stalk in a peel-stalk separator and eliminating epidermis and pith; boiling crushed material by means of adding lignin decomposing agent and digesting assistant at steam pressure of 0.2-0.85 MPa and temperature of 110-180 deg.c for 35-420 min; chlorinating 1-6 % concentration cotton stalk pulp with chlorine of 1-8 % in the chlorinating section at temperature of 15-45 deg.c; alkali treating 6-15 % concentration cotton stalk pulp with NaOH of 0.5-6 % and H2O2 of 0.5-4.0 % in the alkali treating section at the temperature of 40-75 deg.c; bleaching in the bleaching section with hypochlorite of 0.5-6.0 % and NaOH of 0.5-3.0 %; and final washing and screening. The cotton stalk pulp of the present invention has high whiteness up to 75-85 %, low dust content and high strength, and may be used in making paper.

Description

technical field [0001] The invention belongs to a method for producing paper pulp, in particular to a pulping method for improving the whiteness of cotton stalk pulping. Background technique [0002] Cotton is an important crop in my country's economic development strategy. It has a vast planting area. While harvesting cotton, agriculture also provides abundant cotton stalk resources. However, in many rural areas, cotton stalks are not utilized, and the cotton stalks are burned in the fields as agricultural waste, and the rich cotton stalk resources are wasted in vain. [0003] Cotton stalk is an angiosperm phylum, and the dicotyledons of the genus Gossypium are of the same class as hardwoods. Hardwoods, as papermaking raw materials, have been widely used in the manufacture of high-yield and chemical pulp. Cotton stalks are rich in pectin and pigments, and the pulp is difficult to bleach. At present, some people have studied the use of cotton stalks to produce unbleached hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/04D21C1/02D21C1/06D21C1/10D21C3/02D21C3/18D21C9/02D21C9/14D21H17/64
Inventor 徐林杨明生赵永健母辉民愈忠徐延辉张赞华王新忠周文成杨杰
Owner XINJIANG BOHU REED IND
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