Method for preparing saccharide by decomposing cellulose through plasma electrolysis

A technology of plasma and cellulose, which is applied in the production of oligosaccharides or monosaccharides, can solve the problems of long process treatment process and large acid consumption, and achieve the effects of simplified production process, high sugar content and low cost

Inactive Publication Date: 2012-03-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte concentration in the plasma electrolysis process is only 0.01% to 0.1%, and the electrolyte can be acid or alkali, which overcomes the shortcomings of large acid consumption and long process treatment process in common acid hydrolysis technology

Method used

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  • Method for preparing saccharide by decomposing cellulose through plasma electrolysis
  • Method for preparing saccharide by decomposing cellulose through plasma electrolysis
  • Method for preparing saccharide by decomposing cellulose through plasma electrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The general electrolyzer is the plasma electrolysis reactor.

[0024] Step 1, using microcrystalline cellulose as a raw material, mixing microcrystalline cellulose and water in a mass ratio of 1:9 to form a mixed solution containing 10% cellulose;

[0025] Step 2. Add KOH solid to the above mixed solution to prepare a conductivity of 0.05S.m -1 Cellulose electrolyte;

[0026] Step 3: Carry out cathodic plasma electrolysis on the above-mentioned cellulose electrolyte at a voltage of 800V, and treat for 1 hour. The high-energy particles generated during the electrolysis process and the strong oxidizing groups such as OH free radicals generated by the decomposition of water molecules act together on the cellulose On the glycosidic bond of the molecule, the cellulose is decomposed to obtain a solution containing 1.7% glucose, 0.2% mannose, 0.2% xylose and 0.8% arabinose, figure 2 It is the substance peak of 23.2 minutes that is the high-efficiency liquid phase chromatogr...

Embodiment 2

[0029] Step 1, using straw as raw material, crushing the straw into 150-mesh fine powder, and mixing it with water at a mass ratio of 1:4 to form a mixed solution containing 20% ​​cellulose;

[0030] Step two, FeCl 2 The solid is added to the above mixed solution, and the conductivity is prepared to be 0.1S.m -1 Cellulose electrolyte;

[0031] Step 3: Perform anode plasma electrolysis on the above-mentioned cellulose electrolyte at a voltage of 700V, and treat for 2 hours. The high-energy particles generated during the electrolysis process and the strong oxidizing groups such as OH free radicals generated by the decomposition of water molecules act together on the cellulose On the glycosidic bond of the molecule, the cellulose is decomposed to obtain a solution containing 0.7% glucose, 0.02% mannose, 0.03% xylose and 0.3% arabinose;

[0032] Step 4, separating and purifying the above-mentioned sugar-containing solution to obtain relatively pure sugar.

Embodiment 3

[0034] Step 1, using straw as a raw material, crushing the straw into 100-mesh fine powder, and mixing it with water at a mass ratio of 1:4 to form a mixed solution containing 20% ​​cellulose;

[0035] Step two, the H 2 SO 4 The solution is added to the above mixed solution, and the conductivity is prepared to be 0.05S.m -1 Cellulose electrolyte;

[0036] Step 3: Perform anode plasma electrolysis on the above-mentioned cellulose electrolyte at a voltage of 1000V, and treat for 2 hours. The high-energy particles generated during the electrolysis process and the strong oxidizing groups such as OH free radicals generated by the decomposition of water molecules act together on the cellulose On the glycosidic bond of the molecule, the cellulose is decomposed to obtain a solution containing 0.97% glucose, 0.012% mannose, 0.019% xylose and 0.41% arabinose;

[0037] Step 4, separating and purifying the above-mentioned sugar-containing solution to obtain relatively pure sugar.

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Abstract

The invention relates to a method for preparing saccharide by decomposing cellulose through plasma electrolysis, which comprises the following specific steps: (1) adding water into smashed cellulose raw material to prepare mixed liquor with the cellulose mass concentration of 1-20%; (2) adding electrolyte into the cellulose and water mixed liquor to prepare a cellulose electrolyte solution with the conductivity of 0.03-0.1 S.m<-1>; (3) carrying out plasma electrolysis on the electrolyte solution at the electrolysis voltage of 300-1500 V; and (4) separating and purifying the electrolyzed mixture to obtain the saccharide. The method disclosed by the invention overcomes the defects of large acid consumption and long process in the common acid hydrolysis technology. The saccharide prepared in the method has high quantity, does not need any catalyst and has no pollution on the environment, and when being treated, cellulose biomass is directly hydrolyzed without pretreatment, so the production process is simplified, and the cost is low.

Description

technical field [0001] The invention relates to a cellulose decomposition technology, specifically a method for decomposing cellulose by plasma electrolysis, breaking glycosidic bonds in the cellulose, and producing oligosaccharides or monosaccharides. Background of the invention [0002] Cellulose has a wide range of sources and is rich in resources. It is an important potential development target to replace petroleum as fuel and chemicals in the future. The conversion and hydrolysis of cellulose to sugar by physical and chemical methods is an important technical means for cellulose utilization. At present, the main methods for hydrolyzing cellulose into monosaccharides are acid hydrolysis, enzymatic hydrolysis and supercritical hydrolysis. Among them, the acid hydrolysis method includes dilute acid (0.5% to 2%) and concentrated acid hydrolysis. Dilute acid hydrolysis is conducive to the high amount of sugar obtained by hydrolysis of hemicellulose, low catalyst cost, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/00C13K13/00
Inventor 严宗诚陈砺邓丽华王红林
Owner SOUTH CHINA UNIV OF TECH
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