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Preparation method of carboxymethyl guar gum

A technology of carboxymethyl guar gum and guar collagen, applied in the field of preparation of modified guar gum, can solve the problem of high production cost of carboxymethyl guar gum, low viscosity, low degree of substitution, high solvent price, etc. problems, to achieve the effect of promoting wide application, high degree of substitution, and reducing cost

Inactive Publication Date: 2014-04-09
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature about the preparation method of carboxymethyl guar gum mainly contains two aspects, one is the preparation method based on acetone, methyl alcohol, isopropanol or a mixed solvent with ethanol, and the solvent used in these methods is more expensive and more toxic , making the production cost of carboxymethyl guar gum higher, and causing certain pollution to the environment at the same time, which is incompatible with the theme of the development of green chemistry currently advocated
The other is semi-dry chemical synthesis of carboxymethyl guar gum and used as a flocculant. The disadvantage of this method is that the reaction is not complete, so that its viscosity and degree of substitution are not high, and the performance of guar gum will not change too much.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a 250ml three-neck flask, add 5g of guar collagen powder, then add 17.5g of 90% ethanol to dissolve it completely; then add 0.75g of sodium hydroxide, stir at 20-25°C for 30min, and carry out alkalization reaction to obtain alkalization reaction solution; add 0.90g of chloroacetic acid into the alkalization reaction solution, start to heat up under stirring, raise the temperature to 60°C, make it stir and react at 60°C for 60min, and obtain the etherification reaction solution; then cool the etherification reaction solution to At 30°C, adjust the pH to 7.5 with hydrochloric acid.

[0019] Suction-filter the obtained reaction product, wash it dry with 10g of 75% ethanol, repeat the washing twice, then wash once with 10g of absolute ethanol, and finally dry it in an oven at 75-80°C for 1 hour to obtain the finished product.

[0020] According to the performance measurement method, the viscosity is 2850 mPa.s, and the degree of substitution is 0.56; the viscosity of the...

Embodiment 2

[0022] In a 250ml three-neck flask, add 5g of guar collagen powder, then add 19g of 90% ethanol to dissolve it completely; then add 0.80g of sodium hydroxide, stir at 20-25°C for 30min, and carry out alkalization reaction to obtain alkalization reaction liquid ;Add 0.95g of chloroacetic acid to the alkalization reaction liquid, start to heat up under stirring, raise the temperature to 65°C, make it stir and react at 65°C for 58min, and obtain the etherification reaction liquid; then cool the etherification reaction liquid to 30 °C, adjust the pH to 7.5 with hydrochloric acid.

[0023] The obtained reaction product was suction-filtered, and after being sucked dry, it was washed with 11.5g of 75% ethanol, washed twice, then washed once with 11.5g of absolute ethanol, and finally dried in an oven at 75-80°C for 1 hour to obtain finished product.

[0024] According to the performance measurement method, the viscosity is 3050 mPa.s, and the degree of substitution is 0.61; the visc...

Embodiment 3

[0026] In a 250ml three-necked flask, add 5g of guar collagen powder, then add 20g of 90% ethanol to dissolve it completely; then add 0.85g of sodium hydroxide, stir at 20-25°C for 30min, and carry out alkalization reaction to obtain alkalization reaction liquid ;Add 1.10g of chloroacetic acid to the alkalization reaction liquid, start to heat up under stirring, raise the temperature to 70°C, make it stir and react at 70°C for 50min, and obtain the etherification reaction liquid; then cool the etherification reaction liquid to 30 °C, adjust the pH to 7.5 with hydrochloric acid.

[0027] The obtained reaction product was suction-filtered, and after being sucked dry, it was first washed with 12.5g of 75% ethanol, washed twice, then washed once with 12.5g of absolute ethanol, and finally dried in an oven at 75-80°C for 1 hour to obtain finished product.

[0028] According to the performance measurement method, the viscosity is 3600 mPa.s, and the degree of substitution is 0.68; ...

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Abstract

The invention relates to a novel preparation method of carboxymethyl guar gum, which comprises the following three steps: alkalization reaction, etherification reaction and after-treatment. The carboxymethyl guar gum is prepared from the raw material guar gum raw powder by using ethanol as a reaction solvent and sodium hydroxide as a catalyst; and the viscosity of the prepared carboxymethyl guar gum is 3600 mPa.s, and the substitution degree is 0.68. The carboxymethylation reaction of the guar gum is performed in the ethanol solution, so that the carboxymethyl guar gum prepared by the reaction between the chloroacetic acid and guar gum has the advantages of high substitution degree, high viscosity, high solubility and low content of water-insoluble substances. The raw material and process route related in the reaction process conform to the green chemical requirements, and can not generate pollutants, and thus, the reaction process is economic and environment-friendly and has high adaptability. The method has the advantages of short preparation route and simple technique, and is convenient to operate and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of modified guar gum, in particular to a preparation method of carboxymethyl guar gum. Background technique [0002] Guar gum is an environment-friendly natural polymer plant gum, and the derivatives obtained by modifying guar gum are natural polymers with the largest amount except cellulose, and have good water solubility and thickening property; but Guar gum has the disadvantages of high water-insoluble content, slow dissolution rate, difficult control of viscosity, poor heat resistance, easy biodegradation, weak electrolyte resistance and shear resistance, which greatly restricts the application of guar gum . Through chemical modification, its physical and chemical properties can be improved to solve these shortcomings of guar gum; and carboxymethyl guar gum is an anionic guar gum derivative in which part of the hydroxyl groups of guar gum molecules are replaced by carboxymethyl groups, and has high vis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
Inventor 石赟戚文博
Owner LANZHOU UNIVERSITY
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