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Production process of sodium carboxymethyl cellulose

A technology of carboxymethyl cellulose sodium salt and production process, which is applied in the field of production process of carboxymethyl cellulose sodium salt, can solve the problems of poor product uniformity, long production cycle, low transparency, etc., and achieve high practical value and utilization High efficiency and good quality effect

Inactive Publication Date: 2011-04-20
BAOJI RAINBOW TECH
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Problems solved by technology

[0002] The traditional process adopts the water medium method, which requires cellulose alkali impregnation, pressing, crushing, aging and other processes, and the production cycle is long. The etherification reaction uses sodium chloroacetate (obtained by the reaction of chloroacetic acid and soda ash), and the utilization rate of chloroacetic acid is low. 20%, the product has poor uniformity, low transparency, and the degree of substitution is only 0.2-0.3

Method used

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Embodiment Construction

[0016] An embodiment of the present invention is described below.

[0017] The production technology of carboxymethyl cellulose sodium salt has the following steps:

[0018] 1) Put the flocculent cellulose into a caustic soda solution with a concentration of 50%, keep the temperature at 25°C-40°C, and stir continuously for 30-70 minutes to generate an alkaline cellulose solution. The flocculent cellulose is produced by a kneader ;

[0019] 2) adding ethanol with a concentration of 95% into the alkaline cellulose solution and fully mixing to form a mixed solution, the ratio of ethanol and alkaline cellulose solution in the mixed solution is: 1:5; adding ethanol as a reaction solvent to improve the reaction Media, heat transfer, and uniformity, which are different from previous production in that the occurrence of hydrolysis reaction is reduced. At this stage, ethanol itself does not participate in the reaction, but mainly acts as a solvent, with strong penetration ability, inc...

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Abstract

The invention provides a production process of sodium carboxymethyl cellulose. The production process comprises the following steps: putting cellulose into a caustic soda solution the concentration of which is 45-50%, keeping the temperature at 25 DEG C-40 DEG C, and continuously stirring for 30-70 minutes to generate an alkaline cellulose solution; adding ethanol the concentration of which is 85-95% to the alkaline cellulose solution and thoroughly mixing to form a mixed solution; adding a chloroacetic acid solution to the mixed solution, keeping the temperature at 60 DEG C-70 DEG C, and reacting to generate the sodium carboxymethyl cellulose; and putting the sodium carboxymethyl cellulose into a mixed solution of ethanol the concentration of which is 60-70% and a hydrochloric acid solution the concentration of which is 0.1-0.3% for neutralizing and washing, so that the excessive sodium hydroxide and hydrochloric acid in the sodium carboxymethyl cellulose are neutralized. The sodium carboxymethyl cellulose produced by the process has good quality, higher utilization rate of chloroacetic acid, recoverable solvent and higher practical value.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production process of sodium carboxymethyl cellulose. Background technique [0002] The traditional process adopts the water medium method, which requires cellulose alkali impregnation, pressing, crushing, aging and other processes, and the production cycle is long. The etherification reaction uses sodium chloroacetate (obtained by the reaction of chloroacetic acid and soda ash), and the utilization rate of chloroacetic acid is low. 20%, the product has poor uniformity, low transparency, and the degree of substitution is only 0.2-0.3. Contents of the invention [0003] The technical problem solved by the present invention: provide a kind of production technology of carboxymethyl cellulose sodium salt, use ethanol as solvent, save the processes such as cellulose alkali impregnation, pressing, crushing, aging, short production cycle, easy to increase outpu...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 谢宽让
Owner BAOJI RAINBOW TECH
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