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Preparation method of high-viscosity pelletizing sodium carboxymethylcellulose

A high-viscosity technology of sodium carboxymethyl cellulose, which is applied in the field of chemical modification of natural polymer materials, can solve the problems of adverse effects on the health of operators, difficult dispersion of carboxymethyl cellulose, and the need for 16 to 24 hours. Achieve the effects of preventing massive structural damage, good salt-to-stick ratio, and less investment in equipment

Active Publication Date: 2013-04-24
CHONGQING LIHONG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, carboxymethyl cellulose prepared by traditional technology in China is not easy to disperse in aqueous solution, and the dissolution rate is slow. It takes a long time to stir to disperse and dissolve evenly. Generally, it takes 2 to 4 hours, and some even need 16 to 24 hours. more inconvenient
At the same time, the conventional carboxymethyl cellulose currently on the market is powdery fine particles, and the sieving rate of 80 mesh is generally greater than 95%. The dust pollution in the process of production and use is relatively large, causing adverse effects on the environment and the health of operators. influences

Method used

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  • Preparation method of high-viscosity pelletizing sodium carboxymethylcellulose

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Experimental program
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Effect test

Embodiment 1

[0022] Put a certain amount of shredded refined cotton, a mixture of 2.00 times the mass (that is, based on the amount of refined cotton, the same below) of ethanol solution and 1.25 times the mass of sodium hydroxide solution into the kneader. , remove the air in the kneader, make the vacuum degree reach at least 0.06MPa, fill the inert gas into the kneader, make the internal pressure of the kneader greater than 0.02MPa, stir and alkalinize for 60 minutes, add 1.23 times the mass of chloroacetic acid in ethanol Spray the solution evenly into the kneader, remove the air in the kneader, make the vacuum degree reach at least 0.06MPa, then fill the inert gas into the kneader, make the internal pressure of the kneader greater than 0.02MPa, and then carry out the etherification reaction, The temperature is raised to 60-90°C, and the reaction is continued for 50 minutes to obtain a crude sodium carboxymethylcellulose product. After washing, neutralization, and centrifugation, the pro...

Embodiment 2

[0024] Put a certain amount of shredded refined cotton into the kneader with a mixture of 1.80 times the mass of ethanol solution and 1.30 times the mass of sodium hydroxide solution. After feeding, remove the air in the kneader to make the vacuum degree reach at least 0.06MPa, fill the inert gas into the kneader, make the internal pressure of the kneader greater than 0.02MPa, stir and alkalinize for 50 minutes, spray 1.30 times the mass of chloroacetic acid ethanol solution evenly into the kneader, and exclude the kneader Air inside, make the vacuum degree reach at least 0.06MPa, then fill the inert gas into the kneader, make the internal pressure of the kneader more than 0.02MPa, then carry out etherification reaction, the temperature rises to 60-90°C, and the reaction lasts for 60 minutes , to obtain the crude sodium carboxymethyl cellulose product, after washing, neutralization and centrifugation, the product enters the stripper while adding 1.5 times the concentration of 1...

Embodiment 3

[0026] Put a certain amount of shredded refined cotton into the kneader with a mixture of 1.50 times the mass of ethanol solution and 1.20 times the mass of sodium hydroxide solution. After feeding, remove the air in the kneader to make the vacuum degree reach at least 0.06MPa, fill the inert gas into the kneader, make the internal pressure of the kneader greater than 0.02MPa, stir and alkalinize for 70 minutes, spray the ethanol solution of 1.20 times the mass of chloroacetic acid evenly into the kneader, and exclude the kneader The air in the kneader makes the vacuum degree reach at least 0.06MPa, and then fills the inert gas into the kneader, so that the internal pressure of the kneader is greater than 0.02MPa, and then carries out the etherification reaction, the temperature rises to 60-90°C, and the reaction lasts for 70 minutes , to obtain the crude sodium carboxymethyl cellulose product, after washing, neutralization, and centrifugation, the product enters the stripper w...

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Abstract

The invention belongs to the field of chemical modification of a natural high polymer material, and relates to a preparation method of high-viscosity pelletizing sodium carboxymethylcellulose. The sodium carboxymethylcellulose is industrially produced by a kneading method; the obtained sodium carboxymethylcellulose product is added to a steam stripper to carry out partial hydrolyzing in the presence of inert gases after alkalization and etherification reaction, so that the particle morphology of the product can be well controlled in a crushing process so as to play a cross-linking role by adding aluminum chloride, and the granular sodium carboxymethylcellulose with high viscosity is finally obtained. The method disclosed by the invention is simple in technical process of production, short in reaction period, less in equipment investment, low in material consumption, small in dust pollution in the entire process, and environmentally-friendly, and the body health hazard to an operator is reduced to the minimal extent.

Description

technical field [0001] The invention belongs to the field of chemical modification of natural polymer materials, and relates to a preparation method of high-viscosity granulated sodium carboxymethyl cellulose. Background technique [0002] Sodium carboxymethylcellulose (CMC) is an ionic cellulose ether, a water-soluble salt, and a polymer compound in which the hydrogen atoms on the anhydrous glucose unit in cellulose are replaced by carboxymethyl groups. It is With refined cotton as the main raw material and ethanol as the medium, it is refined through alkalization, etherification, washing, raking, drying, crushing and other processes. The CMC aqueous solution has thickening, bonding, film forming, protective glue, and retention Moisture, emulsification and suspension, etc., widely used in food, toothpaste, ceramics, oil drilling, papermaking, medicine, textile, printing and dyeing, paint, cosmetics and other industrial fields, commonly known as "industrial monosodium glutam...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 陈洋溢何玉明陈静郭鸿雁李友琦
Owner CHONGQING LIHONG FINE CHEM
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