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A method for preparing dissolving pulp from cotton linters

A technology of cotton linters and dissolving pulp, which is applied in pulping with inorganic alkali, pulping of cellulose raw materials, pulp bleaching, etc., can solve the problems of large pollution, harsh reaction conditions, and large amount of medicines, etc., to reduce production costs, The effect of reducing the degree of polymerization and reducing the amount of alkali used

Active Publication Date: 2018-05-01
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • A method for preparing dissolving pulp from cotton linters
  • A method for preparing dissolving pulp from cotton linters

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Effect test

Embodiment 1

[0019] A method for preparing dissolving pulp from cotton linters, comprising enzyme treatment, steam bleaching treatment and acid treatment, wherein sulfuric acid is firstly used for acid pretreatment before enzyme treatment.

[0020] The specific steps are:

[0021] Step 1: Acid Pretreatment

[0022] Add 1Kg (absolute dry weight) of cotton linters for raw materials in the stainless steel stirred tank, add sulfuric acid with a pH of 1.5, adjust the slurry concentration to 9%, and process at 30° C. for 12 hours.

[0023] Step 2: Enzyme Treatment

[0024] Wash the slurry after the acid treatment, after washing, add dipotassium hydrogen phosphate-potassium dihydrogen phosphate buffered saline solution to the system, adjust the pH of the system to 7.5, and the slurry concentration is 5%, add 150000U ferulic acid esterase, The ratio of lipase, ferulic acid esterase and lipase enzyme dosage is 8:3, and treated at 70° C. for 2 hours.

[0025] The third step: chemical steam bleach...

Embodiment 2

[0034] A method for preparing dissolving pulp from cotton linters, comprising enzyme treatment, steam bleaching treatment and acid treatment, wherein sulfuric acid is firstly used for acid pretreatment before enzyme treatment.

[0035] The specific steps are:

[0036] Step 1: Acid Pretreatment

[0037] Add 1Kg (absolute dry weight) of cotton linters for the preparation in the stainless steel stirred tank, add the sulfuric acid that pH is 4, adjust the slurry concentration to be 10%, and process at 90° C. for 2 hours.

[0038] Step 2: Enzyme Treatment

[0039] Wash the slurry after acid treatment. After washing, add dipotassium hydrogen phosphate-potassium dihydrogen phosphate buffered saline solution to the system to adjust the pH of the system to 6.5, and the slurry concentration is 6%. Add 15000U lipase and cellulase , the enzyme dosage ratio of lipase and cellulase was 4:15, and treated at 45°C for 35h.

[0040] The third step: chemical steam bleaching treatment

[0041...

Embodiment 3

[0049] A method for preparing dissolving pulp from cotton linters, comprising enzyme treatment, steam bleaching treatment and acid treatment, wherein sulfuric acid is firstly used for acid pretreatment before enzyme treatment.

[0050] The specific steps are:

[0051] Step 1: Acid Pretreatment

[0052] Add 1Kg (absolute dry weight) of cotton linters for raw materials into the stainless steel stirred tank, add sulfuric acid with a pH of 5, adjust the slurry concentration to 9%, and process at 70°C for 7 hours.

[0053] Step 2: Enzyme Treatment

[0054] Wash the slurry after the acid treatment. After washing, add dipotassium hydrogen phosphate-potassium dihydrogen phosphate buffered saline solution to adjust the pH of the system to 8, and the slurry concentration is 7%. Add 100000U ferulic acid esterase and The ratio of cellulase, ferulic acid esterase and cellulase is 9:23, and treated at 65°C for 10 hours.

[0055] The third step: chemical steam bleaching treatment

[0056...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21C3/02D21C9/16D21C1/04
CPCD21C1/04D21C3/022D21C5/005D21C9/163
Inventor 谭飞飞马韵升姚刚徐泽平许伟陈振发刘辛李超孟马杰
Owner CHAMBROAD CHEM IND RES INST CO LTD