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A kind of preparation method of bagasse xylan acetate

A technology of sugar acetate and polyacetate, applied in the field of preparing bagasse xylan acetate, which can solve the problem of low substitution degree of products

Inactive Publication Date: 2011-12-07
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing literature reports on esterified xylan research, the esterification modification reaction is basically under the condition of water as a solvent, and the product substitution degree is relatively low

Method used

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  • A kind of preparation method of bagasse xylan acetate
  • A kind of preparation method of bagasse xylan acetate
  • A kind of preparation method of bagasse xylan acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) drying the bagasse xylan in a vacuum oven at 50° C. for 24 hours;

[0033] (2) Get dried xylan 15g and absolute ethanol 30mL and add in the 250mL four-necked flask that is equipped with reflux condenser, stirring device, mix and stir 60min at room temperature, solvent and bagasse xylan are fully mixed, and It can activate part of the hydroxyl groups in bagasse xylan molecules.

[0034] (3) Adjust the temperature to 60°C, slowly add the mixed solution of 6 g of analytically pure acetic anhydride and 0.15 g of analytically pure sulfamic acid into the four-necked flask with a constant pressure dropping funnel, and keep the temperature for 5 h.

[0035] (4) Pour the reaction solution into a beaker, let it stand for cooling for 30 minutes, repeatedly wash and suction filter with industrial ethanol with a mass concentration of 85%, put the filter cake in a glass dish, and dry it in a vacuum oven at 60°C until constant Weight is the product.

[0036] (5) The degree of su...

Embodiment 2

[0038] (1) drying the bagasse xylan in a vacuum oven at 50° C. for 24 hours;

[0039] (2) Get dried xylan 20g and dehydrated ethanol 50mL and add in the 250mL four-neck flask that is equipped with reflux condenser, stirring device, mix and stir 60min at room temperature, solvent and bagasse xylan are fully mixed, and It can activate part of the hydroxyl groups in bagasse xylan molecules.

[0040] (3) Adjust the temperature to 70°C, slowly add the mixed solution of 12g of analytically pure acetic anhydride and 0.4g of analytically pure sulfamic acid into the four-necked flask with a constant pressure dropping funnel, and keep the temperature for 6h.

[0041] (4) Pour the reaction solution into a beaker, let it stand for cooling for 30min, repeatedly wash and filter with industrial ethanol (mass concentration 85%), put the filter cake in a glass dish, and dry it in a vacuum oven at 60°C until Constant weight is the product.

[0042] (5) The degree of substitution of the produc...

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Abstract

The invention discloses a method for preparing bagasse xylan acetate. Dry bagasse xylan in a vacuum drying oven at 50°C for 24 hours; take 10-20 g of dried bagasse xylan and 25-50 mL of absolute ethanol into the reactor, and mix and stir at room temperature for 60 minutes to make the xylan The sugar is uniformly dispersed in the solvent system; 6~15g of esterification agent acetic anhydride and 0.1~0.5g of catalyst sulfamic acid are slowly dropped into the reactor with a constant pressure separating funnel, and react at 50℃~70℃ for 2~ 6 hours; Pour the reaction solution into a beaker, repeatedly wash with 85% industrial ethanol, filter with suction, put the filter cake in a glass dish, and dry it in a vacuum oven at 60°C until it reaches a constant weight to obtain the product. The pasting performance, thermal viscosity and hydrophobicity of the bagasse xylan acetate synthesized by the invention are greatly improved.

Description

technical field [0001] The invention relates to a method for preparing bagasse xylan acetate. Background technique [0002] With the long-term use of resources such as oil, coal and natural gas, the sharp reduction of the world's forest area and the increase of wood prices, environmental pollution and greenhouse effect have been caused, and the petrochemical resources have also been depleted day by day. Therefore, the research, development and utilization of agricultural and forestry wastes have been paid more and more attention. China is the third largest sugarcane planting country after Brazil and India. The total output of sugarcane in the southern sugarcane region is about 70 million tons, and the output of bagasse reaches about 10 million tons. Bagasse is a major by-product of the sugar industry and an important renewable biomass resource. At present, only preliminary processing and utilization of bagasse have been carried out in China, and the economic value of most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
Inventor 李和平李东旭鲁勇欧辉白国韡魏锦萍
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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