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Combined pretreatment process for improving lignocellulose saccharification effect

A lignocellulosic and pretreatment technology, applied in the direction of fermentation, etc., to achieve the effects of increased economic benefits, low equipment investment, and simple operation

Inactive Publication Date: 2015-10-28
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the existing lignocellulose pretreatment technology, the present invention provides a process of ultrasonic combined alkali / urea pretreatment, which improves the enzymatic hydrolysis and saccharification efficiency of lignocellulose

Method used

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  • Combined pretreatment process for improving lignocellulose saccharification effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) The rice straw was crushed and sieved with 40 meshes, washed twice with ultrapure water, and dried at 55°C until constant weight.

[0023] (2) Further place lignocellulose in a container of appropriate size, add NaOH / urea solution with a concentration of 2% / 3% according to the solid-liquid ratio of 1:20 (g / ml), and place it in a constant temperature environment at 4°C After 4h, wet residue A was obtained by filtration and separation.

[0024] (3) The wet slag A obtained through filtration and separation was further rinsed repeatedly with distilled water until the pH of the rinsing solution was neutral, and dried at 50-60° C. to a constant weight to obtain dry slag B.

[0025] (4) Further place the dry residue B in a container of appropriate size, add ultrapure water at a solid-to-liquid ratio of 1:40 (g / ml), place it under a 120W ultrasonic instrument for 30 minutes, and filter to obtain wet residue C.

[0026] (5) The wet slag C obtained through filtration and sep...

Embodiment 2

[0029] (1) The rice straw was crushed and sieved with 40 meshes, washed twice with ultrapure water, and dried at 55°C until constant weight.

[0030] (2) Further place lignocellulose in a container of appropriate size, add NaOH / urea solution with a concentration of 2% / 3% according to the solid-to-liquid ratio of 1:20 (g / ml), and place it in a constant temperature environment of -10°C After 4 hours, the wet residue A was obtained by filtration and separation.

[0031] (3) The wet slag A obtained through filtration and separation was further rinsed repeatedly with distilled water until the pH of the rinsing solution was neutral, and dried at 50-60° C. to a constant weight to obtain dry slag B.

[0032] (4) Further place the dry residue B in a container of appropriate size, add ultrapure water at a solid-to-liquid ratio of 1:40 (g / ml), place it under a 120W ultrasonic instrument for 30 minutes, and filter to obtain wet residue C.

[0033] (5) The wet slag C obtained through filt...

Embodiment 3

[0036] (1) The rice straw was crushed and sieved with 40 meshes, washed twice with ultrapure water, and dried at 55°C until constant weight.

[0037] (2) Further place lignocellulose in a container of appropriate size, add NaOH / urea solution with a concentration of 4% / 6% according to the solid-to-liquid ratio of 1:20 (g / ml), and place it in a constant temperature environment of -10°C After 4 hours, the wet residue A was obtained by filtration and separation.

[0038] (3) The wet slag A obtained through filtration and separation was further rinsed repeatedly with distilled water until the pH of the rinsing solution was neutral, and dried at 50-60° C. to a constant weight to obtain dry slag B.

[0039] (4) Further place the dry residue B in a container of appropriate size, add ultrapure water at a solid-to-liquid ratio of 1:40 (g / ml), place it under a 120W ultrasonic instrument for 30 minutes, and filter to obtain wet residue C.

[0040] (5) The wet slag C obtained through filt...

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Abstract

The invention provides a combined pretreatment process for improving the lignocellulose saccharification effect. According to the process, firstly, an alkali / urea solution is used for conducting first-step treatment on lignocellulose raw materials, part of lignin and hemicellulose ingredients in the lignocellulose raw materials are removed through chemical treatment, and the stable structure of lignocellulose is damaged to a certain degree; physical treatment is further conducted through ultrasonic waves, and the structure of the lignocellulose is more loosened. After pretreatment of the process, the ingredient content of the lignocellulose is obviously changed, and the proportion of cellulose is remarkably increased. In addition, the structure of the lignocellulose is remarkably changed, the raw material surface becomes rough, loosened and porous, and the accessible surface in the enzymolysis saccharification process is greatly increased. The combined pretreatment process has the advantages of being not high in equipment requirement, simple in operation, moderate in treatment condition, low in cost and the like, and can greatly improve the saccharification efficiency of the lignocellulose.

Description

Technical field: [0001] The invention relates to the technical field of pretreatment for producing bioethanol from lignocellulose, in particular to a two-step pretreatment process of lignocellulose combined with alkali / urea and ultrasound. Background technique: [0002] With the intensification of the global energy crisis, the research on the development of alternative energy has become a hot issue. The production of fuel ethanol from lignocellulose has attracted much attention due to its high environmental and economic value. The first generation of biomass fuel ethanol uses sugar and starch as raw materials, but it faces problems of rising costs and competition for land; using agricultural and forestry waste as the second generation of biomass raw materials to produce fuel ethanol has become the most suitable alternative One of energy. [0003] Lignocellulose is the main product of plant photosynthesis, and its main components are cellulose, hemicellulose and lignin. Am...

Claims

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Application Information

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IPC IPC(8): C12P19/14
Inventor 陈跃辉司梦莹戴友芝张年磊周沫
Owner XIANGTAN UNIV
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