Method for preparing cationic hemicellulose through initiation of plasma

A hemicellulose and plasma technology, applied in the field of ion-induced preparation of cationic hemicellulose, can solve the problems of inability to prepare cationic hemicellulose with a higher degree of substitution, low, generally only 0.01 to 0.02, and limited application, etc. High degree of substitution, improved hydrophilicity, and shortened extraction time

Active Publication Date: 2012-02-08
GUANGXI UNIV
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  • Abstract
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Problems solved by technology

At present, the methods for preparing cationic cellulose mainly include wet method and microwave dry method. The cost of traditional wet method is relatively high, and due to severe hydrolysis, it is impossible to prepare cationic hemicellulose with a high degree of

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  • Method for preparing cationic hemicellulose through initiation of plasma

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Example Embodiment

[0025] 2) Preparation of cationic hemicellulose

[0026] Take a certain amount of the hemicellulose obtained in step 1) and place it in a low temperature plasma reaction chamber for low temperature plasma treatment. Then, 1 g of the treated hemicellulose was added to 30 mL of water, placed in an ultrasonic reactor with a reaction power of 400-700 W, dissolved at 60 °C for 30 min under stirring conditions, cooled to 30 °C, and then added 50 mL of ethanol and water by volume The mixed solution with the ratio of 4:1 was added at 30°C according to the mass ratio of NaOH to hemicellulose of 0.1 to 2:1 for alkalization by adding NaOH for 20min, and then the temperature was raised to 60°C according to the ratio of etherifying agent and hemicellulose. The mass ratio of the cationic etherification agent 3-chloro-2-hydroxypropyltrimethylammonium chloride is added in a ratio of 0.5~2:1, and the etherification reaction time is 0.5~3h. Then it was cooled to room temperature, neutralized w...

Example Embodiment

[0028] Example 1

[0029] 1) Extraction of hemicellulose:

[0030] Take 20 g of bagasse raw material and 6 g of sodium chlorite and add it to 650 ml of water, react at 75 °C for 1 h in an acidic environment, then add 6 g of sodium chlorite, and continue the reaction for 1 h to remove lignin to obtain holocellulose. Cellulose was placed in a KOH solution with a mass percentage concentration of 8%, solid g: liquid mL = 1: 20, and then placed in an ultrasonic pulverizer to strengthen the cellulose, ultrasonic power 200W, temperature 20 ℃, After the reaction for 20min, filter with G2 filter, take the filtrate, neutralize the filtrate with 6mol / L acetic acid to pH 5.5, use three times the volume of ethanol of the above solution to precipitate and filter, and then use the acidified volume concentration to be 80% After washing with ethanol, it was vacuum-dried at 60 °C for 24 h to obtain hemicellulose.

[0031]The applicant measured the mass of the hemicellulose extracted by the ab...

Example Embodiment

[0035] Example 2:

[0036] 1) Extraction of hemicellulose:

[0037] Take 20g of bamboo raw material and 6g of sodium chlorite and add it to 650ml of water, react at 75°C for 1h in an acidic environment, then add 6g of sodium chlorite and continue the reaction for 1h to remove lignin to obtain holocellulose. Cellulose was placed in a KOH solution with a mass percentage concentration of 8%, solid g: liquid mL = 1: 20, and then placed in an ultrasonic pulverizer to strengthen the cellulose, ultrasonic power 900W, temperature 30 ℃, After 200min of reaction, filter with G2 filter, take the filtrate, neutralize the filtrate with 6mol / L acetic acid to pH 5.5, then use three times the volume of ethanol of the above solution to precipitate and filter, and the volume concentration of acidification is 80% washed with ethanol and dried under vacuum at 60 °C for 24 h to obtain hemicellulose.

[0038] The applicant measured the mass of the hemicellulose extracted by the above method to be...

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Abstract

The invention discloses a method for preparing cationic hemicellulose through initiation of plasma, which comprises the following steps of: extracting the hemicellulose under the double action of alkaline salvation and ultrasound enhancement; and preparing cationic hemicellulose through a discharge and initiation function of the low-temperature plasma. The method disclosed by the invention not only overcomes the defects of long consumption time and low extraction efficiency when the hemicellulose is extracted through a conventional alkaline method, but also solves the problem of low replacement of the cationic hemicellulose prepared through the conventional method.

Description

technical field [0001] The invention relates to the technical field of modification of hemicellulose, in particular to a method for preparing cationic hemicellulose by plasma initiation. Background technique [0002] Hemicellulose is one of the main chemical components of plant fiber raw materials and is defined as an alkaline soluble substance after removal of pectin substances. This definition is more general, but it is still recognized by everyone. They differ from cellulose in that there is only a single form of homogeneous glycans in which the D-glucosyl groups form a linear structure in a β-1-4 linkage with each other. Hemicellulose can form both homogeneous and heterogeneous polysaccharides, and it can also be linked into various polysaccharides with different structures by different monosaccharide groups in different ways. Hemicellulose is the most complex component in the cell walls of wood and non-wood plants. They are linked to cellulose by hydrogen bonds, to l...

Claims

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Application Information

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IPC IPC(8): C08B37/14
Inventor 朱红祥夏南南王双飞覃程荣邓超冰宋雪萍骆莲新季剑锋
Owner GUANGXI UNIV
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