Method for preparing dissolving pulp by using cotton linters

Abstract

The invention relates to the technical field of dissolving pulp production, and concretely relates to a method for preparing a dissolving pulp by using cotton linters. The method comprises enzyme treatment, cooking-bleaching treatment and acid treatment, and sulfuric acid is adopted to carry out acid pretreatment before the enzyme treatment. The method can very effectively reduce the polymerization degree of the cotton linters in order to reduce the chemical substance dosage of subsequent enzyme treatment and chemical cooking-bleaching treatment stages, and reduces the production cost; and a boiling substrate solution with a specific composition ratio is adopted in the chemical cooking-bleaching treatment stage, and hydrogen peroxide is also added, so the alkali dosage is greatly reduced, the sewage treatment difficulty is reduced, the sewage treatment cost is reduced, and pollution to environment is reduced.

Description

technical field [0001] The invention relates to the technical field of dissolving pulp production, in particular to a method for preparing dissolving pulp from cotton linters. Background technique [0002] Cotton linters are the short fibers that remain on the cottonseed after ginning. Cotton linters are important raw materials for light and chemical industries such as national defense, textiles, chemical fibers, and papermaking, and are important strategic materials. my country is rich in cotton, and the cotton linter resources are very rich. If all the cottonseeds after ginning are peeled off, the resulting linters can be equivalent to 15% to 20% of the total lint output, so cotton linters are a cellulose resource that cannot be ignored. [0003] First-class cotton linters: The cotton linters stripped by the first stripping machine are mostly longer fibers remaining on the cottonseed due to breakage during the ginning process. Generally, the main body length is above 13...

AI Technical Summary

Problems solved by technology

These traditional processes have certain problems: 1. In order to achieve qualified dissolving pulp products, the amount of medicine required is very large and the reaction conditions are very harsh, resulting in high production costs; 2. The COD of the generated sewage is high, and the difficulty of waste liquid treatment increases. Increased processing costs; 3. The dissolving pulp obtained by the above method has low yield, low whiteness, and difficulty in controlling the degree of polymerization

Therefore, in the process of producing dissolving pulp by the traditional process, there are problems of large pollution, high production cost, unstable quality, and the profit margin is getting smaller and smaller. This traditional process is facing the danger of being eliminated.

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