Preparation method of food-grade sodium carboxymethyl cellulose (CMC) with high substitution degree and ultra-low viscosity

A technology of sodium carboxymethyl cellulose and high substitution degree, which is applied in the production field of sodium carboxymethyl cellulose, can solve the problems of not meeting the purity requirements, low purity and low degree of substitution, etc., and achieves high degree of substitution, high transparency, good water solubility

Active Publication Date: 2015-03-04
SHANGHAI SHENGUANG EDIBLE CHEM
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  • Abstract
  • Description
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Problems solved by technology

[0009] Although the CMC produced by this scheme has a very low viscosity, 8-17CPS (4% B-type viscometer), the degree of substitution is not high, only about 0.8, and the purity is low, only 97%, which does not meet the national standard GB1904- Purity requirements in 2005 (greater than 98%), can only be used in the industrial field, CMC for textile sizing

Method used

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  • Preparation method of food-grade sodium carboxymethyl cellulose (CMC) with high substitution degree and ultra-low viscosity

Examples

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Effect test

Embodiment 1

[0041] 1kg of cellulose raw material (the mass ratio of wood pulp cellulose and cotton cellulose is 0.2:1, wherein the degree of polymerization of cotton cellulose is 600, and the degree of polymerization of wood pulp cellulose is 1000) and 2.35kg of mass concentration 48% sodium hydroxide aqueous solution Add 1.75kg of ethanol with a mass concentration of 95% into the kneader at the same time (aqueous sodium hydroxide solution and ethanol are mixed uniformly in advance), then dilute 0.009kg of a hydrogen peroxide solution with a mass concentration of 30% with ethanol and add, stir, and heat up to 35- 45°C, stirring for 60 minutes. Spray 1.9kg of ethanol solution of chloroacetic acid (mass concentration of chloroacetic acid 70%) evenly into the kneader and stir for 20 minutes. Then gradually raise the temperature, carry out etherification reaction, react at 76-80°C for 60 minutes, cool down, discharge, neutralize, wash, deliquify, dry, and pulverize to obtain food-grade high-s...

Embodiment 2

[0043] 1kg of cellulose raw material (the mass ratio of wood pulp cellulose and cotton cellulose is 0.15:1, wherein the degree of polymerization of cotton cellulose is 500, and the degree of polymerization of wood pulp cellulose is 1000) and 2.5kg of 48% sodium hydroxide aqueous solution Add 1.85kg of ethanol with a mass concentration of 95% into the kneader at the same time (aqueous sodium hydroxide solution and ethanol are mixed uniformly in advance), then dilute 0.013kg of a hydrogen peroxide solution with a mass concentration of 30% with ethanol and add it, and then heat up to 35- 45°C, stirring for 70 minutes. Spray 2.0kg of ethanol solution of chloroacetic acid (mass concentration of chloroacetic acid 70%) evenly into the kneader, and stir for 20 minutes. Then gradually raise the temperature, carry out etherification reaction, react at 76-80°C for 60 minutes, cool down, discharge, neutralize, wash, deliquify, dry, and pulverize to obtain food-grade high-substitution ultr...

Embodiment 3

[0045] 1kg of cellulose raw material (the mass ratio of wood pulp cellulose and cotton cellulose is 0.25:1, wherein the degree of polymerization of cotton cellulose is 500, and the degree of polymerization of wood pulp cellulose is 1000) and 2.3kg of 50% sodium hydroxide aqueous solution Add 2kg of ethanol with a mass concentration of 85% into the kneader at the same time (sodium hydroxide aqueous solution and ethanol are mixed uniformly in advance), and then dilute 0.01kg of a hydrogen peroxide solution with a mass concentration of 30% with ethanol and add it. Stir and heat up to 35-45 °C and stirred for 70 minutes. Spray 1.95kg of ethanol solution of chloroacetic acid (mass concentration of chloroacetic acid 70%) evenly into the kneader, and stir for 20 minutes. Then gradually raise the temperature, carry out etherification reaction, react at 76-80°C for 65 minutes, cool down, discharge, neutralize, wash, deliquify, dry, and pulverize to obtain food-grade high-substitution u...

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Abstract

The invention relates to a preparation method of food-grade sodium carboxymethyl cellulose (CMC) (SG30) with high substitution degree and ultra-low viscosity, belonging to the technical field of sodium CMC production. The preparation method comprises the following steps of adding ethanol and liquid caustic soda with high concentration into a cellulose raw material, meanwhile, adding a viscosity reducer, reducing the viscosity of the cellulose raw material through primary viscosity reduction, and meanwhile alkalifying the cellulose raw material; then, adding an etherifying agent to etherify; and after the etherification reaction is ended, neutralizing, washing by using an ethanol solution with specific concentration according to a certain bath ratio (the cellulose raw material/the ethanol solution), removing the solution, drying and crushing to obtain the food-grade sodium CMC with ultra-low viscosity. The food-grade sodium CMC disclosed by the invention is relatively-high in substitution degree and ultra-low in viscosity and has the 2% Brookfield viscosity of 10-30CPS (measured by using a type-B viscometer), the substitution degree of larger than 1.20 and the purity of higher than 98%. The CMC is clear in solution and stable in viscosity. The food-grade sodium CMC is particularly suitable for being added into a refreshing beverage which is fine and smooth in taste.

Description

technical field [0001] The invention mainly relates to a preparation method of food-grade high-substitution ultra-low viscosity sodium carboxymethyl cellulose, which is suitable for delicate and refreshing beverages, and belongs to the technical field of sodium carboxymethyl cellulose production. Background technique [0002] Sodium carboxymethyl cellulose is the sodium salt of cellulose carboxymethyl ether. It is an anionic cellulose ether. It is a white light yellow fibrous powder or granule with a density of 0.5-0.7 g / cm3. It is odorless, tasteless, and hygroscopic. sex. Easily dispersed in water to form a transparent colloidal solution, insoluble in organic solvents such as ethanol. The pH of 1% aqueous solution is 6.5-8.5, when the pH>10 or <5, the viscosity of the glue will decrease significantly, and the performance is the best when pH=7. Stable to heat, the viscosity rises rapidly below 20°C, and changes slowly at 45°C. Long-term heating above 80°C can denatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12
Inventor 蔡银华乐义华
Owner SHANGHAI SHENGUANG EDIBLE CHEM
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