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Method for producing calcium carboxymethyl cellulose

A carboxymethyl cellulose calcium and quality technology, applied in the field of cellulose derivatives, can solve problems such as unfavorable market competition, low production efficiency, and bulky machines, so as to reduce subsequent wastewater discharge, improve market competitiveness, and optimize labor environmental effects

Inactive Publication Date: 2013-01-09
WUXI KAILI PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing refined cotton production process requires high temperature and high alkali concentration, and the workers' operating conditions are harsh; machines such as steaming balls are bulky, consume high energy, and have low production efficiency; the demand for water and alkali in production is large, and a large amount of water is produced. Alkaline wastewater, high requirements for follow-up sewage treatment
The above shortcomings lead to high production costs of CMC, which is not conducive to the current market competition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Open the cotton linter raw material with a cotton opener, and spray an HCl treatment solution with a mass concentration of 0.1% on the dry cotton lint after opening, and the quality of the pretreatment solution is 1 times the mass of the dry lint ;

[0020] (2) Put the lint sprayed with the pretreatment solution into the NaOH activation solution with a mass concentration of 0.5% and stir for activation, the mass of the activator solution is 5 times the mass of the dry lint, and the stirring time is 3 hours;

[0021] (3) Put the activated cotton pulp into a reaction kettle with a mass concentration of 8% NaOH cooking liquid in advance for cooking, seal the reaction kettle, feed nitrogen into the reaction kettle, make the pressure in the reaction kettle 0.4Mpa, heat up to 120°C, stirring for 2 hours, the quality of the cooking liquid is 3 times the quality of dry lint;

[0022] (4) Bleaching and washing: Wash the cotton pulp in the rinsing tank for 1 hour, adjust to ...

Embodiment 2

[0028] (1) Open the cotton linter raw material with a cotton opener, and spray an HCl treatment solution with a mass concentration of 0.1% on the dry cotton lint after opening, and the quality of the pretreatment solution is twice the mass of the dry lint ;

[0029] (2) Put the lint sprayed with the pretreatment liquid into the NaOH activation solution with a mass concentration of 0.5% and stir for activation, the mass of the activator solution is 7 times the mass of the dry lint, and the stirring time is 2 hours;

[0030] (3) Put the activated cotton pulp into a reaction kettle with a mass concentration of 9% NaOH cooking liquid in advance for cooking, seal the reaction kettle, feed nitrogen into the reaction kettle, make the pressure in the reaction kettle 0.3Mpa, heat up To 110°C, stirring for 3 hours, the quality of the cooking liquid is 4 times the quality of dry lint;

[0031] (4) Bleaching and washing: wash the cotton pulp in the rinsing tank for 1 hour, adjust to neut...

Embodiment 3

[0037] (1) Open the cotton linters raw material with a cotton opener, and spray an HCl treatment solution with a mass concentration of 0.1% on the dry cotton lint after opening, and the quality of the pretreatment solution is 3 times the mass of the dry lint ;

[0038](2) Put the lint sprayed with the pretreatment solution into the NaOH activation solution with a mass concentration of 0.5% and stir for activation, the mass of the activator solution is 8 times the mass of the dry lint, and the stirring time is 1 hour;

[0039] (3) Put the activated cotton pulp into a reaction kettle with a mass concentration of 10% NaOH cooking liquid in advance for cooking, seal the reaction kettle, feed nitrogen into the reaction kettle, make the internal pressure of the reaction kettle 0.2Mpa, heat up to 120°C, stirring for 1 hour, the quality of the cooking liquid is 5 times the quality of dry lint;

[0040] (4) Bleaching and washing: wash the cotton pulp in the rinsing tank for 1 hour, ad...

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Abstract

A method for producing calcium carboxymethyl cellulose includes: soaking refined cotton in diluted hydrochloric acid, then neutralizing and activating the soaked refined cotton with diluted sodium hydroxide, enabling the prepared refined cotton to react with sodium chloroacetate so as to generate sodium carboxymethyl cellulose, displacing by hydrochloric acid and calcifying so that the calcium carboxymethyl cellulose is obtained finally. The method for producing the calcium carboxymethyl cellulose is simple in production process and operation, low in cost, small in wastewater generation quantity and less destructive to the environment.

Description

technical field [0001] The invention relates to the technical field of cellulose derivatives, in particular to a preparation method of carboxymethyl cellulose calcium. Background technique [0002] Calcium carboxymethyl cellulose is an important cellulose derivative. In some cases, it overcomes the shortcomings of sodium carboxymethyl cellulose. It is insoluble in ethanol, chloroform, ether, and acetone. It is very stable to light, heat, air and microorganisms, and has the functions of water absorption, swelling and adhesion. Carboxymethylcellulose calcium is used as a disintegrating agent for tablets in pharmaceuticals, which can increase the hardness of tablets and accelerate disintegration; it can also be used as a diluent or binder for tablets and a dispersant and suspending agent for liquid preparations agent. Carboxymethylcellulose calcium is also a food additive. It is widely used as a thickener and dispersant in the food industry. It has the properties of improving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12C08B1/06
Inventor 杨毅跃康国伟姚程成蒙相锋鲁尧
Owner WUXI KAILI PHARMA
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