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Production technology of high viscosity, high substitution degree and high purity sodium carboxymethyl cellulose

A technology of sodium carboxymethyl cellulose and high degree of substitution, applied in the production process of high degree of substitution, high-purity sodium carboxymethyl cellulose, and the field of high viscosity, can solve the problem of large consumption of organic solvents, reduced uniformity, equipment Large investment and other problems, to achieve the effect of less by-products, simple operation and high viscosity

Active Publication Date: 2013-12-04
JIANGSU TAILIDA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is characterized by rapid and uniform heat transfer and mass transfer in the reaction process; the main reaction speed is fast, the side reaction is less, and the utilization efficiency of the etherification agent is 10-20% higher than that of the water-coal method; the reaction stability and uniformity are improved, replacing the uniform The performance and performance are greatly improved, the consumption of organic solvent is large, the investment in equipment is large, and the production cost is high
[0007]In the current technology, the preparation method of increasing the viscosity of the CMC product will lead to a decrease in its uniformity

Method used

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  • Production technology of high viscosity, high substitution degree and high purity sodium carboxymethyl cellulose

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Embodiment 1

[0024] First add about 20% of the total amount of the alkali wine mixture into the alkalization kneader and cool down to -5°C, then add about 25% of the total amount of the etherification agent chloroacetic acid, and stir for 15 minutes. Then put in cellulose with a degree of polymerization of about 2800, control the temperature at -10°C, and carry out low-temperature alkalization within 30 minutes. Add the remaining 75% etherifying agent after alkalization is finished. Then heat up to 75°C for high-temperature etherification reaction. The reaction time is 40 minutes. After the etherification is completed, the material enters the washing process for four washings. The alcohol concentrations of the four washings are 50%, 55%, 60%, and 65% respectively. Solid-liquid separation is carried out by centrifugal pressing, the centrifugal speed is 2000 rpm, and the pressing speed is 6m3 / hour; the solid enters the drying process, and the dried materials are crushed and packaged. The vi...

Embodiment 2

[0026] First add about 20% of the total amount of the alkali wine mixture into the alkalization kneader and cool down to -5°C, then add about 25% of the total amount of etherification agent and stir for 15 minutes. Then put in cellulose with a degree of polymerization of about 2800, control the temperature at 30°C, and carry out low-temperature alkalization within 60 minutes. Add the remaining 75% etherifying agent after alkalization is finished. Then the temperature is raised to 80°C for high-temperature etherification reaction. After etherification, the material enters the washing process for four washings, using ethanol as the solvent, the alcohol concentrations of the four washings are 62%, 66%, 70%, and 74% respectively, and the solid-liquid separation is carried out by centrifugal pressing, and the centrifugal speed is 2400 revolutions per minute, and the pressing speed is 10m3 / hour; the solids enter the drying process, and the materials that pass the drying process are...

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Abstract

The invention discloses production technology of high viscosity, high substitution degree and high purity sodium carboxymethyl cellulose, which comprises the following steps: firstly, adding alkali alcohol mixed liquor in an alkalization kneading machine for cooling, and then adding etherifying agent; then putting cellulose with the polymerization degree of 2400-2800 into the mixture, and controlling the temperature to perform low temperature alkalization; adding etherifying agent again after alkalization, and then heating to perform high temperature etherification reaction; enabling the material to enter the washing procedure for four-stage washing after etherification, performing solid-liquid separation through centrifugal squeezing, enabling the solid to enter the drying procedure, and smashing and packaging the qualified dried material. The technology disclosed by the invention has the advantages that few by-products are produced, the production yield is high, the operation is simple, the viscosity and the substitution degree of the obtained product are high, and the purity of the obtained product reaches 99.5%.

Description

technical field [0001] The invention relates to a preparation method of sodium carboxymethyl cellulose, in particular to a production process of sodium carboxymethyl cellulose with high viscosity, high degree of substitution and high purity. Background technique [0002] Sodium carboxymethyl cellulose, referred to as CMC, is a carboxymethylated derivative of cellulose, also known as cellulose gum, and is the most important ionic cellulose gum. CMC was first produced in Germany in 1918, and was patented in 1921, and then commercialized in Europe. At that time, it was only crude product, used as colloid and binder. From 1936-1941, research on the industrial application of CMC was quite active and several suggestive patents were published. During World War II, Germany used CMC in synthetic detergents. The industrial production of CMC started in the 1930s at IG Farbenindustrie AG in Germany. Since then, the production process, production efficiency and product quality have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12C08B11/22
Inventor 陈宽建王平谭跃红
Owner JIANGSU TAILIDA NEW MATERIAL CO LTD