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Method for preparing microcrystalline cellulose by electron beam irradiation

A technology of microcrystalline cellulose and electron beam irradiation, applied in the field of microcrystalline cellulose preparation, can solve the problems of large consumption of inorganic acid, a large amount of waste acid solution, environmental pollution, etc., and achieves high production efficiency, simple and convenient process, and improved income. rate effect

Inactive Publication Date: 2018-12-18
HENAN KEGAO RADIATION CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluidity is directly proportional to the microcrystalline cellulose particles, the larger the particles, the better the fluidity. However, one of the biggest problems of the acid hydrolysis method is that it needs to consume a large amount of inorganic acid. Every ton of microcrystalline cellulose needs to consume industrial hydrochloric acid 5- 8 tons (or other equivalent mineral acid)
Subsequent washing and other treatment processes will inevitably produce a large amount of waste acid solution, which will bring serious environmental pollution problems. With the development of science and technology and the enhancement of people's awareness of environmental protection, the desire for high-efficiency, environmental protection, and energy-saving microcrystalline cellulose preparation methods is becoming increasingly urgent. , therefore need a kind of production efficiency high, the preparation method of microcrystalline cellulose polymer base

Method used

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  • Method for preparing microcrystalline cellulose by electron beam irradiation

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Effect test

Embodiment 1

[0021] A method for preparing microcrystalline cellulose by electron beam radiation, comprising the following steps:

[0022] S1: Take an appropriate amount of natural cellulose pulp and place it under high-energy ionizing radiation for degradation treatment;

[0023] S2: chop the degraded natural cellulose pulp with a cutting machine and put it into a kneader;

[0024] S3: adding an appropriate amount of dilute acid aqueous solution to a kneader with natural cellulose pulp, and kneading the mixed material for a certain period of time at a certain temperature to obtain a paste;

[0025] S4: washing the paste obtained in S3 multiple times, filtering and separating the washed mixture to obtain solid matter, repeatedly washing and filtering the solid matter until the solid matter does not contain acid solution;

[0026] S5: drying the cleaned solid in S4 and then grinding and pulverizing to obtain microcrystalline cellulose.

[0027] Specifically, natural cellulose pulp include...

Embodiment 2

[0032] A method for preparing microcrystalline cellulose by electron beam radiation, comprising the following steps:

[0033] S1: Take an appropriate amount of natural cellulose pulp and place it under high-energy ionizing radiation for degradation treatment;

[0034] S2: chop the degraded natural cellulose pulp with a cutting machine and put it into a kneader;

[0035] S3: adding an appropriate amount of dilute acid aqueous solution to a kneader with natural cellulose pulp, and kneading the mixed material for a certain period of time at a certain temperature to obtain a paste;

[0036] S4: washing the paste obtained in S3 multiple times, filtering and separating the washed mixture to obtain solid matter, repeatedly washing and filtering the solid matter until the solid matter does not contain acid solution;

[0037] S5: drying the cleaned solid in S4 and then grinding and pulverizing to obtain microcrystalline cellulose.

[0038] Specifically, natural cellulose pulp include...

Embodiment 3

[0043] A method for preparing microcrystalline cellulose by electron beam radiation, comprising the following steps:

[0044] S1: Take an appropriate amount of natural cellulose pulp and place it under high-energy ionizing radiation for degradation treatment;

[0045] S2: chop the degraded natural cellulose pulp with a cutting machine and put it into a kneader;

[0046] S3: adding an appropriate amount of dilute acid aqueous solution to a kneader with natural cellulose pulp, and kneading the mixed material for a certain period of time at a certain temperature to obtain a paste;

[0047] S4: washing the paste obtained in S3 multiple times, filtering and separating the washed mixture to obtain solid matter, repeatedly washing and filtering the solid matter until the solid matter does not contain acid solution;

[0048] S5: drying the cleaned solid in S4 and then grinding and pulverizing to obtain microcrystalline cellulose.

[0049] Specifically, natural cellulose pulp include...

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Abstract

The invention discloses a method for preparing microcrystalline cellulose by electron beam irradiation. The method is characterized by using natural cellulose pulp as a raw material, microcrystallinecellulose is prepared by a combination process of gamma ray or a high-energy electron beam radiation degradation technology and a mechanochemical acidolysis technology. The preparation process has thefollowing conditions: the absorbed dose is 10-200 kGy, the mass fraction of a dilute acid aqueous solution is 0.5%-2.0%, and the mass ratio of the dilute acid aqueous solution to the natural cellulose pulp is 0.5-2.0: 1.0, the kneading temperature is 60 to 110 DEG C, and the kneading time is 30 to 120 minutes. Compared with a conventional acid hydrolysis method, the preparation method has a largereduction in the amount of acid, and the water consumption in a washing process is greatly reduced, and the washing wastewater can be simply treated to realize no pollution discharge.

Description

technical field [0001] The invention relates to the field of microcrystalline cellulose preparation, in particular to a preparation method for preparing microcrystalline cellulose by electron beam radiation. Background technique [0002] As we all know, microcrystalline cellulose is a kind of purified, partially depolymerized cellulose, which has a low degree of polymerization and a large specific surface area. Vegetables are used as raw materials, using dilute acid at a certain temperature to carry out acid degradation for a certain period of time, reaching its limit degree of polymerization, and then obtaining microcrystalline cellulose crystals. The degree of polymerization of conventional microcrystalline cellulose is higher than 200-250 The crystallinity is generally 0.60-0.80. The fluidity is directly proportional to the microcrystalline cellulose particles, the larger the particles, the better the fluidity. However, one of the biggest problems of the acid hydrolysis ...

Claims

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Application Information

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IPC IPC(8): C08B15/02
CPCC08B15/02
Inventor 崔国士束兴娟杨蓓樊茹张蕊蕊
Owner HENAN KEGAO RADIATION CHEM TECH
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