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Combined pretreatment process for efficiently and environmentally friendly improving enzymolysis saccharification efficiency of lignocellulose

A lignocellulose and pretreatment technology, applied in the direction of biofuels, fermentation, etc., to achieve the effect of improving saccharification efficiency, enzymatic hydrolysis and saccharification efficiency, and mild treatment conditions

Inactive Publication Date: 2017-12-19
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the existing lignocellulose pretreatment technology, the present invention provides a choline chloride / lactic acid combined NU pretreatment process, which improves the enzymatic hydrolysis and saccharification efficiency of lignocellulose

Method used

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  • Combined pretreatment process for efficiently and environmentally friendly improving enzymolysis saccharification efficiency of lignocellulose
  • Combined pretreatment process for efficiently and environmentally friendly improving enzymolysis saccharification efficiency of lignocellulose
  • Combined pretreatment process for efficiently and environmentally friendly improving enzymolysis saccharification efficiency of lignocellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0024] ( ) The rice straw is dried and crushed, and the particle size is controlled to be 180-425 μm;

[0025] ( ) Lactic acid and choline chloride were mixed at a molar ratio of 4:1, placed in a shaker at 70 °C, until a completely fused colorless and transparent liquid was formed, and then stabilized for 10 minutes before being taken out for use;

[0026] ( ) into rice straw at a content of 10% (W / W), adding the above ( ) in the eutectic solvent, and vibrated and mixed in a shaker at 70 °C for 48 h, filtered and cleaned the filter residue with distilled water until the pH of the cleaning solution was neutral, and dried the cleaned filter residue at 55 °C. Obtain rice straw samples after NADES treatment;

[0027] ( ) Put the NADES-treated rice straw in a container of appropriate size, add 4% / 6% NU solution at a solid-to-liquid ratio of 1:20 (g / mL), and place it in a constant temperature environment of 25 °C for 4 hours Finally, filter and wash the filter residue wit...

Embodiment 2

[0031] ( ) The rice straw is dried and crushed, and the particle size is controlled to be 180-425 μm;

[0032] ( ) Lactic acid and choline chloride were mixed at a molar ratio of 4:1, placed in a shaker at 70 °C, until a completely fused colorless and transparent liquid was formed, and then stabilized for 10 minutes before being taken out for use;

[0033] ( ) into rice straw at a content of 10% (W / W), adding the above ( ) in the eutectic solvent, and vibrated and mixed in a shaker at 70 °C for 48 h, filtered and cleaned the filter residue with distilled water until the pH of the cleaning solution was neutral, and dried the cleaned filter residue at 55 °C. Obtain rice straw samples after NADES treatment;

[0034] ( ) Put the NADES-treated rice straw in a container of appropriate size, add NU solution with a concentration of 4% / 6% at a solid-liquid ratio of 1:20 (g / mL), and place it in a constant temperature environment at 4°C for 4 hours Finally, filter and wash the ...

Embodiment 3

[0038] (a) Rice straw is dried and crushed, and the particle size is controlled to be 180-425 μm;

[0039] ( ) Lactic acid and choline chloride were mixed at a molar ratio of 4:1, placed in a shaker at 70 °C, until a completely fused colorless and transparent liquid was formed, and then stabilized for 10 minutes before being taken out for use;

[0040] (c) Add rice straw at a content of 10% (W / W), add the above ( ) in the eutectic solvent, and vibrated and mixed in a shaker at 70 °C for 48 h, filtered and cleaned the filter residue with distilled water until the pH of the cleaning solution was neutral, and dried the cleaned filter residue at 55 °C. Obtain rice straw samples after NADES treatment;

[0041] ( ) Put the NADES-treated rice straw in a container of appropriate size, add 2% / 3% NU solution at a solid-to-liquid ratio of 1:20 (g / mL), and place it in a constant temperature environment at 25 °C for 4 hours Finally, filter and wash the filter residue with distilled ...

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Abstract

The invention relates to a process for improving enzymolysis saccharification efficiency of lignocelluloses through combined pretreatment of an NADES and NU. The process comprises the following steps: firstly, mixing choline chloride / lactic acid according to a certain ratio, and performing further treatment on a lignocelluloses raw material so as to remove a part of lignin and hemicelluloses and damage the dense structure of the lignocelluloses; further performing a second step of pretreatment on the lignocelluloses by using NU at different temperature. By adopting the process, the ratios of the lignin and the hemicelluloses can be reduced, the surfaces of the lignocelluloses are loosened and porous, the accessible areas of the lignocelluloses are increased, and the saccharification efficiency of the lignocelluloses is improved. The combined pretreatment process has the advantages of being low in equipment requirement, simple to operate, gentle in treatment condition, low in cost, environmentally friendly and the like, and the saccharification efficiency of the lignocelluloses can be greatly improved.

Description

technical field [0001] The present invention relates to the technical field of bioethanol pretreatment from lignocellulose, specifically a process for improving lignocellulose enzymatic hydrolysis and saccharification efficiency through NADES (natural deep eutectic solvent) choline chloride / lactic acid and NU combined pretreatment . Background technique [0002] Under the background of the world's strong demand for energy and the depletion of traditional fossil energy, renewable bioenergy has attracted more and more attention. Lignocellulose is the largest renewable resource on earth, and using it as a raw material to produce fuel ethanol is considered to be one of the effective ways to solve the energy crisis. Lignocellulose is mainly composed of cellulose, hemicellulose, and lignin to form a complex and stable structure through hydrogen bonds, covalent bonds, etc., and its conversion into fuel ethanol mainly includes three processes: pretreatment, enzymatic saccharificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10
CPCC12P7/10C12P2201/00Y02E50/10
Inventor 陈跃辉张斌斌
Owner XIANGTAN UNIV
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