Preparation method of carboxymethylated bagasse xylan derivative

A carboxymethylation and xylan technology, which is applied in the field of preparation of carboxymethylated bagasse xylan derivatives, can solve the problems of poor solubility of bagasse xylan, narrow application range and the like, and achieves safe and free raw material utilization. Toxic, high utilization rate of raw materials, low cost effect

Inactive Publication Date: 2010-06-23
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0004] In order to overcome the problems of poor solubility and narrow application range of existing bagasse xylan, the present invention provides a method for preparing carboxymethylated bagasse xylan derivatives

Method used

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  • Preparation method of carboxymethylated bagasse xylan derivative
  • Preparation method of carboxymethylated bagasse xylan derivative
  • Preparation method of carboxymethylated bagasse xylan derivative

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Embodiment

[0025] (1) Mix analytically pure ethanol, analytically pure petroleum ether and water in a volume ratio of 6:3:1 to obtain a solvent; bagasse xylan, monochloroacetic acid and sodium hydroxide are fed in a mass ratio of 1:0.89:0.9 , Monochloroacetic acid and sodium hydroxide are first dissolved with 6 times and 2 times the corresponding mass of the above solvent for subsequent use;

[0026] (2) Get 21g of bagasse xylan and 105g of the above-mentioned solvent and stir evenly, get half of the sodium hydroxide solution prepared in step (1), add it dropwise in the reaction system, adjust the rate of addition, and control the pH value of the system at 9~12 Between, react at 45 ℃ for 2 hours;

[0027] (3) Add 0.06 g of metallocene catalyst, drop the above-mentioned monochloroacetic acid solution and the remaining sodium hydroxide solution to the reaction system respectively, control the pH value of the system between 9 and 12, and react at 65° C. for 3 hours;

[0028] (4) adding dro...

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Abstract

The invention discloses a preparation method of a carboxymethylated bagasse xylan derivative, which comprises the following steps: feeding bagasse xylan, monochloroacetic acid and sodium hydroxide according to a proportion, mixing the bagasse xylan and a solvent well, taking half of the solution into a reactor after the sodium hydroxide is dissolved in the solvent, controlling the reaction pH to be 9-12, and making reaction last for 1-2 hour(s) at a temperature of 25-45 DEG C; adding a metallocene catalyst, respectively adding the monochloroacetic acid after being dissolved in the solvent and the residual sodium hydroxide solution into the reaction system, controlling the reaction pH to be 9-12, and making reaction last for 2-5 hours at a temperature of 45-75 DEG C; dropping dilute acid, mixing the solution, adjusting the pH of the reaction system to be neutral, and vacuum-filtering to obtain a rough product under hot conditions; washing the rough product with ethanol water until no Cl- is left in the rough product, washing the product with acetone for dehydration, placing the product after dehydration into a vacuum drying cabinet, drying the product for 12 hours at a temperature below 60 DEG C, and naturally cooling the product. The invention has the advantages of simple process control and high utilization rate of raw materials. The prepared carboxymethylated bagasse xylan has good water solubility, thermal stability and surface activity.

Description

technical field [0001] The invention relates to a preparation method of carboxymethylated bagasse xylan derivatives. Background technique [0002] Guangxi is the largest producer of sugar cane and sucrose in my country, and sucrose production accounts for more than 60% of the country's total output. According to the data released by the Guangxi Sugar Industry Association, the sugar production in the 2007 / 2008 crushing season reached 9.41 million tons. According to 1 ton of sugar, 1.2 tons of bagasse (water content 50%) are produced, and the bagasse produced in 2007 / 2008 reached 11.292 million tons. How to rationally develop and utilize this characteristic resource, and how to transform resource advantages into advantages of industrial development has recently aroused people's great attention. At present, bagasse can be made into many products. In addition to conventional products such as pulping and papermaking, power generation, man-made panels, and composting, it is also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
Inventor 李和平何利霞牛春花袁庆广李东旭鲁勇
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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