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Method for preparing sodium carboxymethylcellulose with degree of substitution from bagasse

A technology of sodium carboxymethylcellulose and bagasse fiber, which is applied in the field of preparing sodium carboxymethylcellulose with a high degree of substitution, and can solve the problems of high raw material cost, complicated pretreatment process and serious pollution of sodium carboxymethylcellulose , to achieve the effect of increasing the amorphous area, environmental protection of the process, and improving the reactivity

Inactive Publication Date: 2012-10-10
YULIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing sodium carboxymethyl cellulose with high degree of substitution by using bagasse to solve the problems of high raw material cost, complicated pretreatment process, serious pollution and low yield of sodium carboxymethyl cellulose , expand the utilization of bagasse fiber and protect the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 50g of bagasse crushed to 30 meshes into the grinding barrel of the stirring mill, then add stainless steel balls with a diameter of 6mm, the volume ratio of the balls to the material is 3:1, adjust the speed to 400 rpm and the temperature of the constant temperature water bath at 60°C, and cover plate. Take it out after 1.0 hour to obtain activated bagasse fiber.

[0020] Weigh 3.00 g of activated bagasse fiber and 2.40 g of chloroacetic acid into a three-necked flask, then add 27 mL of absolute ethanol, mix and stir at 20° C. for 40 min, then add 1.02 g of sodium hydroxide (dissolved in 3 mL of distilled water), Then add 6mL of absolute ethanol, stir and alkalinize at 30°C for 50min, heat up to the reaction temperature of 75°C for 6h after alkalization, adjust the pH to neutral with glacial acetic acid after the reaction, cool to room temperature, and then add 250mL of 100 Stir and disperse with % ethanol for 120 min, filter with suction, the precipitate is the c...

Embodiment 2

[0024] Add 50g of bagasse crushed to 50 meshes into the grinding cylinder of the stirring mill, then add stainless steel balls with a diameter of 6mm, the volume ratio of the balls to the material is 3:1, adjust the rotating speed to 400 rpm and the temperature of a constant temperature water bath at 60°C, and cover it plate. Take it out after 1.0 hour to obtain activated bagasse fiber.

[0025] Weigh 3.00 g of activated bagasse fiber and 2.80 g of chloroacetic acid into a three-necked flask, then add 30 mL of absolute ethanol, mix and stir at 30° C. for 40 min, then add 0.51 g of sodium hydroxide (dissolved in 3 mL of distilled water), Then add 21mL of absolute ethanol, stir and alkalinize at 25°C for 30min, after the alkalization is completed, raise the temperature to the reaction temperature of 45°C and react for 2h, after the reaction, adjust the pH to neutral with glacial acetic acid, cool to room temperature, and then add 200mL of 90 Stir and disperse with % ethanol for...

Embodiment 3

[0029] Add 50g of bagasse crushed to 40 meshes into the grinding barrel of the stirring mill, then add stainless steel balls with a diameter of 6mm, the volume ratio of the balls to the material is 3:1, adjust the speed to 400 rpm and the temperature of the constant temperature water bath at 60°C, and cover it plate. Take it out after 1.0 hour to obtain activated bagasse fiber.

[0030] Weigh 3.00 g of activated bagasse fiber and 2.80 g of chloroacetic acid into a three-necked flask, then add 30 mL of absolute ethanol, mix and stir at 30° C. for 40 min, then add 0.51 g of sodium hydroxide (dissolved in 3 mL of distilled water), Then add 21mL of absolute ethanol, stir and alkalinize at 30°C for 40min, after the alkalization is completed, raise the temperature to the reaction temperature of 75°C and react for 2h, after the reaction is completed, adjust the pH to neutral with glacial acetic acid, cool to room temperature, and then add 200mL of 90 Stir and disperse with % ethanol...

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Abstract

The invention discloses a method for preparing sodium carboxymethylcellulose with the degree of substitution from bagasse. The method comprises the following steps of: performing ball-milling pretreatment on bagasse fibers, and etherifying bagasse cellulose and purifying. In the method, the bagasse fibers are subjected to the ball-milling pretreatment, so a lignin protective layer is broken, a crystalline structure of the cellulose is changed, an amorphous area of the bagasse cellulose is increased, and the reaction activity of the bagasse cellulose is improved; and by a subsequent series of methods and the optimization of control parameters, the degree of substitution of the prepared sodium carboxymethylcellulose is up to 1.5, the yield is 50 percent, the production cost is low, and a process is simple and environment-friendly.

Description

technical field [0001] The invention relates to a method for preparing sodium carboxymethyl cellulose with high substitution degree from bagasse. Background technique [0002] Carboxymethyl cellulose (CMC) is a derivative with an ether structure obtained by chemically modifying natural cellulose, and its sodium salt is usually used. Because the aqueous solution of sodium carboxymethyl cellulose has the functions of thickening, bonding, film forming, protective glue, moisture retention, emulsification and suspension, it is widely used in petroleum, natural gas, textile, printing and dyeing, papermaking, ceramics, construction, food, pharmaceuticals, etc. Widely used in the industry, it is the product with the largest output, the widest application and the most convenient use among the cellulose ethers. The degree of substitution of sodium carboxymethyl cellulose on the market is generally low, between 0.4 and 1.0, while sodium carboxymethyl cellulose with a degree of substit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/12
Inventor 陈渊朱万仁谢祖芳
Owner YULIN NORMAL UNIVERSITY
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