A method for improving the drainage of cotton linter chemi- mechanical pulp

By employing a two-stage pectinase treatment process, combined with NaOH impregnation and mechanical dissociation, the problem of pectin affecting the water permeability of cotton stalk chemimechanical pulp was solved, improving the water permeability and physical strength of the pulp, and enhancing the efficiency and economic benefits of the papermaking process.

CN118147937BActive Publication Date: 2026-04-14INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Patent Information

Application Number
CN202410080786.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-19
Publication Date
2026-04-14
Estimated Expiration
2044-01-19

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively remove pectin from cotton stalk chemimechanical pulp, resulting in poor pulp filtration, which affects pulp washing, concentration, and paper machine speed, thus reducing the economic benefits of paper manufacturing enterprises.

Method used

A two-stage pectinase treatment process is adopted, which combines NaOH impregnation and mechanical dissociation. Through pectinase pretreatment and two-stage pectinase treatment, pectin substances are degraded into small molecules, thereby improving the water permeability of cotton stalk chemipulative pulp.

Benefits of technology

It significantly improves the water permeability of cotton stalk chemimechanical pulp, reduces chemical and energy consumption, increases the physical strength and water permeability of the pulp, enhances the washing and concentration effects of the pulp, and promotes paper machine speed.

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Abstract

The application discloses a method for improving the drainage of cotton stalk chemi-mechanical pulp, and belongs to the field of pulping and papermaking. The method comprises the following steps: after the cotton stalk is crushed, washed and steamed, a first chemical impregnation agent is added, and then mechanical disintegration is performed to obtain cotton stalk material; pectinase is used to perform enzyme pretreatment on the cotton stalk material to obtain pretreated material; a second chemical impregnation agent is added to the pretreated material, mechanical disintegration is performed, and then refining disintegration is performed to obtain refined material; after the refined material is washed, enzyme treatment is performed on the refined material by using pectinase to obtain cotton stalk chemi-mechanical pulp with obviously improved drainage. By selecting pectinase as a biological enzyme and designing a two-stage treatment process of pectinase, pectin substances in cotton stalk raw materials can be effectively removed, pectin is degraded into small molecular substances such as galacturonic acid, the drainage of cotton stalk chemi-mechanical pulp is improved, and the influence of pectin on the papermaking process is eliminated.
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