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Preparation method of sub-micron cellulose

A cellulose and sub-micron technology, applied in the field of preparation of sub-micron cellulose, can solve the problems of high energy consumption and high cost, and achieve the effects of reducing energy consumption, low cost and avoiding a large amount of energy consumption.

Inactive Publication Date: 2016-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the patent of the invention is to overcome the problems of huge energy consumption and high cost in the existing production technology, and provide a method for preparing submicron cellulose with simple process, low energy consumption and low cost

Method used

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Examples

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Effect test

Embodiment 1

[0030] A method for preparing submicron cellulose, comprising the following steps and process conditions:

[0031] (1) Drying of dissolving pulp: drying the eucalyptus dissolving pulp at 105°C until the moisture content is lower than 2%;

[0032] (2) Swelling of dissolving pulp: Mix methanol and dimethyl sulfoxide (DMSO) two solvents according to the mass ratio of 1:5 to prepare a swelling liquid, and add the swelling liquid to the dried dissolving pulp to control the swelling liquid of the dissolving pulp. The dry weight accounts for 1% by weight of the whole mixed solution.

[0033] (3) Dissociation of dissolving pulp: keep the swelling solution prepared in step (2) at 50°C and keep stirring, after stirring for 30 minutes, add KOH 1.5 times the mass of dissolving pulp, and continue stirring for 60 minutes.

[0034] (4) Modification of dissolving pulp: in step (3), add sodium acetate of 2 times of dissolving pulp quality and 1 times of sodium dipropyl acetate. At the same t...

Embodiment 2

[0039] A method for preparing submicron cellulose, comprising the following steps and process conditions:

[0040] (1) Drying of dissolving pulp: drying eucalyptus dissolving pulp at 110°C until the moisture content is lower than 2%;

[0041] (2) Swelling of dissolving pulp: Mix ethanol and dimethyl sulfoxide (DMSO) two solvents according to the mass ratio of 1:4 to prepare a swelling liquid, wherein the dried dissolving pulp is added to the swelling liquid to control the dissolution The dry weight of the slurry accounts for 3% by weight of the entire mixed solution.

[0042](3) Dissociation of the dissolving pulp: keep the swelling solution prepared in step (2) at 40°C and keep stirring for 20 minutes, then add NaOH twice the mass of the dissolving pulp, and continue stirring for 10 minutes.

[0043] (4) Modification of dissolving pulp: in step (3), add dissolving pulp quality 3 times of sodium acetate and 1 times of sodium chloroacetate. At the same time, the solution was ...

Embodiment 3

[0047] A method for preparing submicron cellulose, comprising the following steps and process conditions:

[0048] (1) Drying of dissolving pulp: drying the eucalyptus dissolving pulp at 105°C until the moisture content is lower than 2%;

[0049] (2) Swelling of dissolving pulp: Mix two solvents of methanol and water according to the mass ratio of 1:2 to prepare a swelling liquid. After the dried dissolving pulp is added to the swelling liquid, control the absolute dry weight of the dissolving pulp to account for the entire mixture. The weight ratio of the solution is 5%.

[0050] (3) Dissociation of dissolving slurry: keep the swelling liquid prepared in step (2) at 30°C and keep stirring, after stirring for 90 minutes, add KOH 4 times the mass of dissolving slurry, and continue stirring for 15 minutes.

[0051] (4) Modification of dissolving pulp: add sodium acetate 5 times of dissolving pulp quality in step (3). At the same time, the solution was kept at 50°C for 5 hours,...

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Abstract

The invention discloses a preparation method of sub-micron cellulose. The method comprises the steps: adding common plant fiber dissolving pulp into a mixed solution composed of two solvents of methanol, glycerol, dimethyl sulfoxide, ethanol, N-N dimethyl acetamide and water, continually stirring the mixed solution, then adding NaOH or KOH for reacting for 10-100min, then adding one or two of sodium acetate, sodium monochloroacetate, sodium valproate and sodium thioglycolate for reacting for 1-10h, then carrying out washing with water, and carrying out filtering to obtain a sub-micron cellulose solution. The technology has no need of mechanical treatment and avoids massive energy loss. The preparation method of sub-micron cellulose adopts a fully chemical means for treatment and has the characteristics of simple process, low energy consumption, environment friendliness, low cost and the like, and simultaneously, the reaction solution can be reused through recovery equipment.

Description

technical field [0001] The invention relates to a method for preparing submicron cellulose, in particular to a method for preparing submicron cellulose with simple process, low energy consumption, environmental friendliness and low cost; it can be used as a filler for various pharmaceutical tablets, Disintegrants, dietary fiber, glidants, etc. Background technique [0002] As a commonly used raw material in the pharmaceutical and food industries, submicron cellulose can be used to make suspending agents and film-forming agents for various drugs, stabilizers and emulsifiers for beverages, detergents and thickeners, etc. Although it has achieved relatively rapid development in recent years and its applications have become more and more extensive, there is still a large gap with the technical level of developed countries. The main reason is that the production process requires high energy-consuming mechanical processing methods, which not only reduces production efficiency but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/00C08B15/02A61K47/38
CPCA61K47/38C08B15/00C08B15/02
Inventor 刘德桃程凡路朋博林美燕欧阳豪陈克复
Owner SOUTH CHINA UNIV OF TECH
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