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Preparation method of oxidized bagasse xylan

A technology of xylan and bagasse, which is applied in the field of preparation of oxidized bagasse xylan, can solve the problems of low oxidation depth and affecting product performance, and achieve high oxidation depth, improved hydrophobicity, high crystallinity and crystallization area Effect

Active Publication Date: 2013-02-06
金湖县综合检验检测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used oxidant is sodium peroxide. After the reaction, crystallization, dialysis, ion exchange resin and other methods are used to separate, and oxidized xylan with a lower oxidation depth can be obtained; in addition, HIO can also be used 4 / NaClO 2 The system is used as an oxidizing agent. Periodic acid is a relatively strong and selective oxidizing agent that can introduce dialdehyde groups. However, xylan is degraded to varying degrees during the oxidation process, which affects the performance of the product.

Method used

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  • Preparation method of oxidized bagasse xylan
  • Preparation method of oxidized bagasse xylan
  • Preparation method of oxidized bagasse xylan

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Dry bagasse xylan in a vacuum oven at 60°C to constant weight to obtain powdery dry basis bagasse xylan.

[0032] (2) Add 10 g of powdered dry-based bagasse xylan and 22 g of analytically pure acetone obtained in step (1) into the reactor to prepare a xylan suspension with a mass fraction of 32%.

[0033] (3) Weigh 0.4g of sodium hydroxide and dissolve it in 7.5mL of deionized water, then add it into the xylan suspension obtained in step (2), stir and activate for 1 hour.

[0034] (4) Dissolve 0.2g of potassium permanganate in 10 mL of deionized water and add to the material obtained in step (3), then add 0.3g of catalyst nickel sulfate, control the reaction temperature of the system to 55°C, and carry out the oxidation reaction under stirring. Add 1 mL of 5% sodium hydroxide solution every 20 minutes to maintain the pH of the system at 9, and react for 4 hours until the system changes from purple to brown.

[0035] (5) Add concentrated sulfuric acid with a mass fr...

Embodiment 2

[0041] (1) Dry bagasse xylan in a vacuum oven at 60°C to constant weight to obtain powdery dry basis bagasse xylan.

[0042] (2) Add 13g of powdered dry-based bagasse xylan and 24g of analytically pure acetone obtained in step (1) into the reactor to prepare a xylan suspension with a mass fraction of 35%.

[0043] (3) Weigh 0.5g of sodium hydroxide and dissolve it in 10mL of deionized water, then add it into the xylan suspension obtained in step (2), stir and activate for 1 hour.

[0044] (4) Dissolve 0.4g of potassium permanganate in 15 mL of deionized water and add it to the material obtained in step (3), then add 0.2g of catalyst nickel sulfate, control the reaction temperature of the system at 60°C, and carry out the oxidation reaction under stirring; Add 1 mL of 10% sodium hydroxide solution in 20 minutes to maintain the pH of the system at 10, and react for 5 hours until the system changes from purple to brown.

[0045] (5) Add concentrated sulfuric acid with a mass fra...

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Abstract

The invention discloses a preparation method of oxidized bagasse xylan. The method comprises the steps of taking bagasse xylan as a raw material, acetone-aqueous solution as a solvent of a reaction system, potassium permanganate as an oxidant and nickel sulfate as a catalyst, oxidizing to obtain a crude product by an acid-alkali process, washing with an acetone aqueous solution with the volume fraction of 50% and an alcohol solution with the volume fraction of 80% for 2-3 times, leaching, and conducting vacuum drying to obtain the oxidized bagasse xylan product. The oxidized bagasse xylan has the characteristics of high oxidization depth, higher crystallinity, larger crystallization area, ideal thermostability and the like. The method is stable to operate, simple and easy in process and suitable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of oxidized bagasse xylan. Background technique [0002] Xylan is an abundant renewable resource in nature and is the most common type of hemicellulose. Due to its unique biological activity and physiological function, it has attracted the attention of many fields such as chemical industry, food, biology, medicine and cosmetics in recent years. Xylan hemicellulose has a unique chemical structure such as branched, amorphous composition of several different types of monosaccharides (heteropolysaccharides) and different types of functional groups (e.g. hydroxyl, acetyl, carboxyl, methoxy, etc.) , these different types of glycans have different chemical behaviors compared to cellulose and starch, but also limit their utilization. Studies have shown that these shortcomings can often be solved by modification such as esterification, etherification, grafting, oxidation, crosslinking and compound denaturation. B...

Claims

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Application Information

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IPC IPC(8): C08B37/14A61K47/48A61K47/61
Inventor 李和平胡杨杨官威张垚杨永哲袁金伟黄云燕何利霞
Owner 金湖县综合检验检测中心
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