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Method for pre-processing lignocellulose biomass to increase sugar field of lignocellulose biomass

A technology of lignocellulosic and lignocellulose, which is applied in the field of green chemistry and biomass new energy production, and can solve problems such as unfriendly environment

Active Publication Date: 2016-03-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the use of traditional organic solvents reduces the viscosity of the system and the cost of pretreatment, there are still potential problems such as unfriendly environment

Method used

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  • Method for pre-processing lignocellulose biomass to increase sugar field of lignocellulose biomass
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  • Method for pre-processing lignocellulose biomass to increase sugar field of lignocellulose biomass

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Experimental program
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Effect test

Embodiment 1

[0061] A method for pretreating lignocellulosic biomass to improve its sugar yield, comprising the steps of:

[0062] 1) mixing ionic liquid, γ-valerolactone, and lignocellulosic biomass to form a pre-dissolution pretreatment system;

[0063] 2) heating and dissolving the pre-dissolved mixture system to form a solution;

[0064] 3) adding an anti-solvent to the solution system to precipitate the dissolved lignocellulosic biomass, and filter and separate;

[0065] 4) Taking a certain amount of regenerated lignocellulosic biomass, adding a buffer solution, cellulase and xylanase to carry out enzymatic hydrolysis to obtain a sugar solution.

[0066] See attached for specific flow chart figure 1 .

Embodiment 2

[0068] In a 100 milliliter round bottom flask, add 14.9 grams of 1-ethyl-3-methylimidazole acetate (EmimAc), 35.1 grams of gamma-valerolactone to form a mixed solvent system, wherein the ionic liquid mole percentage is 20%, and then 5 grams of corn stalks (physical size: 1 mm, water content 5%) were added to form a predissolved pretreatment mixed solution. Under mechanical stirring, stir and dissolve at 140°C for 15 minutes. Then cool to room temperature, add 3 times the volume of pretreatment solution of anhydrous methanol to regenerate the pretreated corn stalks, filter and separate, then wash the precipitate twice with 3 times the volume of anhydrous methanol, and freeze-dry the precipitate to obtain Pretreated corn stover. Accurately weigh 0.5 g of regenerated lignocellulosic biomass, place it in a 100 mL Erlenmeyer flask, add 10 mL of citric acid-sodium citrate buffer solution with pH 4.8, stir well, and divide the mixture according to the ratio of 0.02 g / g substrate Ad...

Embodiment 3

[0070] In a 100 milliliter round bottom flask, add 4.1 grams of 1-ethyl-3-methylimidazole acetate (EmimAc), 45.9 grams of gamma-valerolactone to form a mixed solvent system, wherein the ionic liquid molar percentage is 5%, and then 5 grams of corn stalks (physical size: 0.5 mm, water content 8%) were added to form a pre-dissolved pre-treatment mixed solution. Under mechanical stirring, stir and dissolve at 80°C for 180 minutes. Then cool to room temperature, add 3 times the volume of pretreatment solution of dehydrated alcohol to regenerate the lignocellulosic biomass after pretreatment, filter and separate, then wash the precipitate 2 times with 3 times the volume of dehydrated ethanol, and the precipitate will be ready after drying Obtain the pretreated corn stalks. Accurately weigh 0.5g of regenerated lignocellulosic biomass, place it in a 100mL Erlenmeyer flask, then add 10ml of pH4.8 citric acid-sodium citrate buffer solution, stir well, and divide the mixture according ...

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Abstract

The invention provides a method for dissolving and pre-processing lignocellulose biomass through a mixed solvent formed by ionic liquid and gamma-valerolactone to increase the sugar field of lignocellulose biomass. The method includes the following steps that firstly, ionic liquid, gamma-valerolactone and lignocellulose biomass are mixed to form a pre-dissolving and pre-processing system; secondly, a pre-dissolving mixture system is heated and dissolved, and a solution is formed; thirdly, an anti-solvent is added into the solution system, and the dissolved lignocellulose biomass precipitates and regenerates; fourthly, the regenerative lignocellulose biomass is taken, a buffering solution, cellulase and xylanase are added for enzymolysis, and a sugar solution is obtained. Part of the ionic liquid is replaced by biology-base gamma-valerolactone, and the mixed system is formed. The method has the advantages that the technology is simple, solvent cost is low, operation is convenient, the solvent can be recycled, and cellulose and hemicellulose in the processed lignocellulose biomass have the advantages that the enzyme hydrolysis speed is high and the sugar yield is high.

Description

technical field [0001] The invention belongs to the technical field of green chemistry and biomass new energy production, and specifically relates to a method for dissolving and pretreating lignocellulosic biomass with a mixed solvent composed of ionic liquid and γ-valerolactone to increase its sugar production rate. Background technique [0002] With the consumption of traditional energy such as coal and oil and the energy crisis facing the world, the comprehensive utilization of green and renewable raw materials is a necessary means to achieve sustainable social development. Lignocellulosic biomass has attracted much attention as the most widely distributed and abundant renewable biomass resource on earth. Lignocellulosic biomass utilizes CO 2 As a raw material, it is synthesized by photosynthesis in nature, and its main components are cellulose (35%-50%), hemicellulose (20%-40%) and lignin (15%-25%). Such as agricultural straw, wood, shrubs, etc. are lignocellulosic bio...

Claims

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Application Information

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IPC IPC(8): C12P19/14
CPCY02P20/54
Inventor 谢海波赵宗保于雪
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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