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Method for degrading lignocellulose to generate reducing sugar

A technology of lignocellulose and process method, which is applied in the field of lignocellulose degradation and utilization and industrial catalysis, which can solve the problems of difficult recycling of alkaline hydrogen peroxide, high corrosion resistance requirements, and high production cost, and achieve easy tracking control and corrosion resistance The effect of low requirement and low cost

Inactive Publication Date: 2013-11-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses acid as a catalyst, and neutralizes it with alkali after the reaction is completed. 2% to 100% of the quality of raw materials, the use of concentrated acid is large, and a large amount of 0.5mol / L sodium hydroxide is required to neutralize it. In industrial production, the requirements for corrosion resistance of equipment are high, and it is easy to cause environmental pollution.
Its main disadvantages are: the alkaline hydrogen peroxide used to pretreat lignocellulosic raw materials is not easy to recycle, which makes the production cost too high, and dilute sulfuric acid is used to catalyze the hydrolysis of cellulose, which requires a large amount of acid and requires high corrosion resistance of equipment, which is easy to cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] With 5g of 1-butyl-3-methyl ionic liquid as solvent, 120 μL of hydrogen peroxide as catalyst, Mg 2+ is a cocatalyst, where H 2 o 2 The mass ratio to microcrystalline cellulose is 1g: 10g, Mg 2+ The mass ratio of microcrystalline cellulose to microcrystalline cellulose is 1 g:200 g, and 0.4 g of microcrystalline cellulose was reacted under normal pressure at 100° C. with magnetic stirring for 17 hours. After the reaction was completed, it was cooled with cooling water. Wash the reaction product with absolute ethanol that is 3 times the volume of the reaction product, and the washed mixture is centrifuged at 10,000 r / min for 5 minutes, filtered, dried, and weighed. The conversion rate of cellulose is 100%, and the yield of reducing sugar is 71.6%. . Ethanol was removed from the obtained ionic liquid ethanol solution with a rotary evaporator to obtain an ionic liquid, and the recovery rate of the ionic liquid was 96.5%.

Embodiment 2

[0032] With 5g of 1-butyl-3-methyl ionic liquid as solvent, 120 μL of hydrogen peroxide as catalyst, Mg 2+ is a cocatalyst, where H 2 o 2 The mass ratio to bamboo pole powder is 1g: 10g, Mg 2+ The mass ratio to the bamboo culm powder was 1g:50g, and 0.4g of the bamboo culm powder was pulverized to 40 mesh and reacted with magnetic stirring at 100°C for 22 hours under normal pressure. After the reaction was completed, it was cooled with cooling water. Wash the reaction product with absolute ethanol that is 3 times the volume of the reaction product, and the washed mixture is centrifuged at 10000r / min for 5min, filtered, dried, and weighed. The conversion rate of cellulose is 83.2%, and the yield of reducing sugar is 67.4%. . Ethanol was removed from the obtained ionic liquid ethanol solution with a rotary evaporator to obtain an ionic liquid, and the recovery rate of the ionic liquid was 95.1%.

Embodiment 3

[0034]With 5g of 1-butyl-3-methyl ionic liquid as solvent, 120 μL of hydrogen peroxide as catalyst, Mg 2+ is a cocatalyst, where H 2 o 2 The mass ratio to corn stalks is 1g: 10g, Mg 2+ The mass ratio of corn stalks to corn stalks is 1g:50g, and 0.4g of corn stalks crushed to 40 meshes were reacted under normal pressure at 100° C. with magnetic stirring for 20 hours. After the reaction was completed, it was cooled with cooling water. Wash the reaction product with absolute ethanol that is 3 times the volume of the reaction product, and the washed mixture is centrifuged at 10,000r / min for 5min, filtered, dried, and weighed. The conversion rate of cellulose is 81.5%, and the yield of reducing sugar is 66.3%. . Ethanol was removed from the obtained ionic liquid ethanol solution with a rotary evaporator to obtain an ionic liquid, and the recovery rate of the ionic liquid was 95.4%.

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Abstract

The invention discloses a method for degrading lignocellulose to generate reducing sugar, and in particular relates to the method for degrading lignocellulose to generate reducing sugar by using H2O2 as a catalyst and using metal ion as a catalyst promoter. The method comprises the following steps: adopting an ionic liquid as a solvent, commercially available hydrogen peroxide with the mass fraction of 30% as a catalyst and metal ion as a catalyst promoter; and dissolving and degrading lignocellulose materials to generate water-soluble reducing sugar, wherein the ionic liquid can be recycled. The method for degrading lignocellulose to generate reducing sugar has the characteristics of being simple and convenient to operate, gentle in condition, environment-friendly, low in cost, less in byproducts, high in reducing sugar yield and the like. The method for degrading lignocellulose to generate reducing sugar can be used for treating various lignocellulose materials; and when the lignocellulose materials are treated by adopting the method, the conversion rate of the lignocellulose materials is bigger than 80%, the reducing sugar yield is bigger than 65%, and the recovery rate of the ionic liquid is bigger than 95%.

Description

1. Technical field [0001] The invention belongs to the field of lignocellulose degradation utilization and industrial catalysis, and in particular relates to a method for degrading lignocellulose to generate reducing sugar. 2. Background technology [0002] Lignocellulose is the most abundant and cheapest renewable resource on earth. According to data, the annual production of cellulose and hemicellulose in plants in the world is as high as 8.5×10 10 t. my country is a large agricultural country with extremely rich lignocellulose resources. The development of biomass resource conversion technology mainly based on lignocellulose is conducive to improving the current situation of resource shortage and environmental degradation, and is of great economic importance to the sustainable development of human society. and social significance. Lignocellulosic raw materials are composed of three major components: cellulose, hemicellulose and lignin. Hemicellulose acts as a molecular...

Claims

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Application Information

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IPC IPC(8): C13K13/00C13K1/02C13K11/00C13K7/00C13K5/00
Inventor 王丹汪楠魏顺安王洪辉王競张杰周小华
Owner CHONGQING UNIV
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