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Preparation method of low-viscosity sodium carboxymethylcellulose

A technology of sodium carboxymethyl cellulose and low viscosity, applied in the direction of sustainable manufacturing/processing, chemical industry, climate sustainability, etc., can solve the problems of increasing the difficulty of product separation and purification, side reactions, disadvantages, etc., to avoid Effects of washing dissolution loss, short reaction cycle, and process simplification

Inactive Publication Date: 2016-06-01
GUANGXI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The biggest problem with this method is that various chemical reagents are added in the reaction process, which increases the difficulty of product separation and purification, and there are many side reactions, which is not conducive to industrial production.

Method used

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  • Preparation method of low-viscosity sodium carboxymethylcellulose
  • Preparation method of low-viscosity sodium carboxymethylcellulose
  • Preparation method of low-viscosity sodium carboxymethylcellulose

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Embodiment Construction

[0024] A preparation method of low-viscosity sodium carboxymethyl cellulose, comprising the steps of:

[0025] A. Solution preparation: Weigh 10.00g of carboxymethylcellulose sodium (CMC) solid powder, dry in a constant temperature drying oven at 105°C for 2 hours, and weigh 6.00g of dried carboxymethylcellulose sodium with an electronic balance Add the sodium carboxymethyl cellulose to distilled water with a constant temperature of 80°C while stirring, and stir on a constant temperature magnetic stirrer for one hour to completely dissolve the sodium carboxymethyl cellulose to obtain carboxymethyl cellulose with a concentration of 6g / L. Sodium methylcellulose solution, after the sodium carboxymethylcellulose solution is cooled, it is left to stand overnight to discharge the gas dissolved in the sodium carboxymethylcellulose solution, and then the sodium carboxymethylcellulose solution Diluted to a concentration of 3g / L sodium carboxymethyl cellulose solution, then adjust the ...

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Abstract

The invention relates to a preparation method of low-viscosity sodium carboxymethylcellulose; a sodium carboxymethylcellulose solution is heated to 50 DEG C by means of water bath and then is poured into a reaction vessel, and the pressure intensity in a Venturi tube is adjusted to 0.3 MPa by a pressure gauge; then the sodium carboxymethylcellulose solution in the reaction vessel is divided into two streams to be inputted into the Venturi tube from two opposite inlets by a material pump, and the two streams are knocked in the Venturi tube, then a knocking flow is generated and a cavitation effect is formed; the sodium carboxymethylcellulose solution after cavitation effect flows back to the reaction vessel from an outlet of the Venturi tube; and after the sodium carboxymethylcellulose solution in the reaction vessel is subjected to 30 min circulation cavitation reaction, a low-viscosity sodium carboxymethylcellulose solution is obtained. The preparation method has the advantages of simple equipment, energy saving, high efficiency, lower cost, no need to add strong oxidizing reagents, simple post-treatment operation and the like, and can achieve large-scale industrialized production.

Description

technical field [0001] The invention relates to a method for preparing low-viscosity sodium carboxymethyl cellulose, in particular to degrading high-viscosity food additive-sodium carboxymethyl cellulose by physical degradation to prepare low-viscosity CMC products. Background technique [0002] CMC (sodium carboxymethyl cellulose) is a kind of cellulose ether, which is usually made of short cotton linters or wood pulp, treated with sodium hydroxide and then reacted with sodium chloroacetate. There are usually three preparation methods : Water-borne method, solution method and solvent method, and other plant fibers are also used to prepare CMC. CMC is a kind of cellulose ether produced from cellulose under the action of sodium hydroxide and sodium monochloroacetate. Taking CMC degree of substitution (DegreeofSubstitution, DS) as an example, the total reaction chemical formula is as follows: [0003] [C 6 h 7 o 2 (OH) 3 ]n+nClCH 2 COOH+2nNaOH→[C 6 h 7 o 2 (OH) 2 OCH...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/20C08B11/12
CPCY02P20/10
Inventor 何仁刘惠贤黄永春聂强胡立平
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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