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The preparation method of high-purity food grade higher viscosity sodium carboxymethyl cellulose

A kind of sodium carboxymethyl cellulose, food-grade technology, applied in the field of sodium carboxymethyl cellulose production, to achieve the effect of convenient operation, simple process and clear solution

Inactive Publication Date: 2016-09-21
SHANGHAI SHENGUANG EDIBLE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent CN 102775503A states that the main purpose of its product is to be used in oil field exploitation, which is biased towards industrial use, and this product is not suitable for food

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1kg cotton fiber (Nantong Yaohua Cellulose Co., Ltd., model is M-1000, degree of polymerization is 2650) and 1.8kg 50% sodium hydroxide aqueous solution and 1.6Okg 95% ethanol are added in the kneader simultaneously (sodium hydroxide aqueous solution Mix well with ethanol in advance), under stirring, heat up to 35-45°C, and stir for 60 minutes. Spray 1.5kg of ethanol solution of chloroacetic acid (the concentration of chloroacetic acid is 70%) evenly into the kneader, then carry out etherification reaction, gradually raise the temperature to 70-80°C, etherification reaction for 70 minutes, and continuously Pass into nitrogen protection so that the viscosity is not destroyed, nitrogen pressure is kept at 0.3-0.4MPa. Lower the temperature to 40-60°C, discharge, neutralize, wash, deliquify, dry, and pulverize to obtain high-purity food-grade high-viscosity sodium carboxymethyl cellulose. The degree of substitution is 0.95, the 1% viscosity of type B (Brookfield) is 7679cp...

Embodiment 2

[0032] 1kg cotton fiber (Nantong Yaohua Cellulose Co., Ltd., model is M-1000, degree of polymerization is 2650) and 2.0kg 45% sodium hydroxide aqueous solution and 1.6kg 95% ethanol are added in the kneader simultaneously (sodium hydroxide aqueous solution Mix well with ethanol in advance), under stirring, heat up to 35-45°C, and stir for 60 minutes. Spray 1.5kg of ethanol solution of chloroacetic acid (the concentration of chloroacetic acid is 75%) evenly into the kneader, then carry out etherification reaction, gradually heat up to 70-80°C, and etherification reaction takes 80 minutes. The viscosity is not destroyed by feeding nitrogen protection, and the nitrogen pressure is maintained at 0.3-0.4MPa. Lower the temperature to 40-60°C, discharge, neutralize, wash, deliquify, dry, and pulverize to obtain high-purity food-grade high-viscosity sodium carboxymethyl cellulose. The degree of substitution is 0.97, the B-type (Brookfield) 1% viscosity is 735Ocps, the purity is 99.5%...

Embodiment 3

[0034]1kg cotton fiber (Nantong Yaohua Cellulose Co., Ltd., model is M-1000, degree of polymerization is 2650) and 2.2kg 48% sodium hydroxide aqueous solution and 1.7kg 95% ethanol are added in the kneader simultaneously (sodium hydroxide aqueous solution Mix well with ethanol in advance), under stirring, heat up to 35-45°C, and stir for 60 minutes. Spray 1.8kg of ethanol solution of chloroacetic acid (the concentration of chloroacetic acid is 70%) evenly into the kneader and then carry out etherification reaction, gradually raise the temperature to 70-80 ° C, etherification reaction for 80 minutes, and continuously pass through the whole process. The viscosity is not destroyed by nitrogen protection, and the nitrogen pressure is kept at 0.3-0.4MPa. Lower the temperature to 40-60°C, discharge, neutralize, wash, deliquify, dry, and pulverize to obtain high-purity food-grade high-viscosity sodium carboxymethyl cellulose. Substitution degree 0.99, type B (Brookfield) 1% viscosit...

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Abstract

The invention relates to a preparation method of food-grade sodium carboxymethyl cellulose (CMC) with high purity and relatively-high 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 cotton fibers; then, adding an etherifying agent, and adding concentrated alkaline and the etherifying agent after reacting for a period of time; next, etherifying until ending the etherification reaction; and finally, neutralizing, washing, removing a solution, drying and crushing to obtain the food-grade sodium CMC with relatively-high viscosity. The food-grade sodium CMC disclosed by the invention is relatively-high in substitution degree and viscosity and has the 1% Brookfield viscosity of more than 6000CPS (measured by using a type-B viscometer) and the purity of higher than 99.5%. The CMC is clear in solution and stable in viscosity.

Description

technical field [0001] The invention relates to a method for preparing high-purity food-grade sodium carboxymethyl cellulose with relatively high viscosity, 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 white or milky white fibrous powder or granules with a density of 0.5-0.7 g / cubic centimeter. It is almost odorless and tasteless. Hygroscopicity. 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 the pH=7. Stable to heat, the viscosity rises rapidly below 20°C, and changes slowly at 45°C, and heating for a long time above 80°C can denature the colloid and significa...

Claims

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Application Information

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