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Method for acidylation modification of hemicellulose and modified hemicellulose

A technology of hemicellulose and acylation, which is applied in the field of hemicellulose acylation modification and acylation modification of hemicellulose, which can solve the problems of increased use of chemical reagents, long chemical reaction time, and long heating time. Achieve the effects of saving heating time, avoiding white pollution, and using less

Inactive Publication Date: 2008-11-05
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventive method adopts the traditional direct heating method to heat the reactants, and the heating time is long, and acid removal agent and a large amount of acid chloride reagent need to be added, and the chemical reaction time is long
And the use of chemical reagents increases, causing pollution to the environment

Method used

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  • Method for acidylation modification of hemicellulose and modified hemicellulose
  • Method for acidylation modification of hemicellulose and modified hemicellulose
  • Method for acidylation modification of hemicellulose and modified hemicellulose

Examples

Experimental program
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preparation example Construction

[0031] Preparation of straw hemicellulose.

[0032] The stalk that 50g pulverizes is placed in the glass reactor of 3000ml, adding mass percent concentration is 2% H 2 o 2 Aqueous solution, adjust pH value to 11.5 with NaOH (mass percent concentration is 20%) solution, control reaction temperature to be 50 ℃, react under stirring for 17 hours; then filter, and wash filter residue with distilled water, combine filtrate; Add 6M HCl solution to adjust the pH to 6.0; then add 3.5 times the volume of 95% ethanol to the solution to precipitate the soluble hemicellulose, filter the precipitated hemicellulose, and fully wash with 70% acidic ethanol (pH6.0) solution The filter residue is obtained by drying the filter residue in the air and crushing the dried hemicellulose.

[0033] Using the prepared 0.66g hemicellulose (containing 0.01mol xylose hydroxyl group) as raw material, the acylation reaction was carried out.

Embodiment 1

[0035] 1. Prepare materials according to the following ratio:

[0036] Straw hemicellulose powder (containing 0.01mol xylose hydroxyl) 0.66g

[0037] N,N-Dimethylformamide (DMF) 35ml

[0038] Lithium chloride (LiCl) 0.10g

[0039]N-Bromosuccinimide (NBS) 0.033g

[0040] Propanoyl chloride 0.93g

[0041] 2. Preactivation treatment of hemicellulose

[0042] First, put all the straw hemicellulose powder (0.01 mol of xylose hydroxyl group in hemicellulose composition) into a 100ml reactor, then add 10ml of distilled water, heat to 78°C, and keep stirring until the hemicellulose is completely dissolved.

[0043] Then, add 20ml of N,N-dimethylformamide (DMF), stir evenly, and repeatedly distill under reduced pressure at 50°C and a vacuum of 0.08Mpa to remove the distilled water in the swollen mixture to make the semi-fiber The mixture of element, distilled water and DMF is jelly, and distilled water accounts for 9% of mixture gross weight.

[0044] 3. Acylation reaction of hem...

Embodiment 2

[0052] 1. Prepare materials according to the following ratio:

[0053] Straw hemicellulose (containing 0.01mol xylose hydroxyl) 0.66g

[0054] N,N-Dimethylformamide (DMF) 35ml

[0055] Lithium chloride (LiCl) 0.10g

[0056] 4-Dimethylaminopyridine (DMAP) 0.033g

[0057] n-octyl chloride 3.3g

[0058] 2. Preactivation treatment of hemicellulose

[0059] First: put all the straw hemicellulose powder (0.01mol xylose hydroxyl group in the hemicellulose composition) in a 100ml reactor, then dissolve it in 10ml distilled water, heat to 78°C, and keep stirring until the hemicellulose is completely dissolve.

[0060] Then, add 20ml of N,N-dimethylformamide (DMF), stir evenly, and repeatedly distill under reduced pressure at 50°C and a vacuum of 0.08Mpa to remove the distilled water in the swelling mixture, and make the hemicellulose, The mixture of distilled water and DMF was jelly, and distilled water accounted for 9% of the total amount of the mixture.

[0061] 3. Acylation r...

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Abstract

The invention discloses an acylation modified hemicellulose and a method for acylation modifying the hemicellulose. The method is to generate hemicellulose ester through acylating reaction of the hemicellulose under microwave irradiation effect. The method of the invention has the advantages of rapid reaction speed and high substitution degree. The acylation modified hemicellulose ester prepared can be applied to produce biodegradable food package films to replace petrochemical plastic products, thus having a wide applying prospect in food industry and plastic film industry.

Description

technical field [0001] The invention relates to a chemical modification method of a polysaccharide compound and the modified polysaccharide compound, in particular to a method for acylation modification of hemicellulose and the acylation modification hemicellulose. Background technique [0002] The main components in the cell wall of straw (wheat straw, corn stalk, rice straw or sorghum stalk) are cellulose, hemicellulose and lignin, and the content of the three accounts for more than 90% of the total biomass. Hemicellulose is a plant cell wall polysaccharide closely related to cellulose, and its content is second only to cellulose. In my country, straw has always been used as a raw material for papermaking. People have done a lot of research on cellulose and lignin, but neglected the research on 28% to 33% of hemicellulose. The reason for this negligence is because , hemicellulose is degraded and oxidized into formic acid, acetic acid, lactic acid and other substances and c...

Claims

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Application Information

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IPC IPC(8): C08B37/14
Inventor 许凤孙润仓孙金霞彭湃彭锋
Owner BEIJING FORESTRY UNIVERSITY
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