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Lignocellulose acid/alkali coupling pretreatment method

A lignocellulose and lignin technology, applied in the field of biomass resource conversion and utilization, can solve the problems of high process energy consumption, large equipment investment, insufficient attention to the treatment of hemicellulose and lignin, etc. The effect of saving energy consumption and cheap and easy availability of solvents

Inactive Publication Date: 2011-08-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method mainly uses mechanical crushing, microwave, steam explosion and other means to improve the efficiency of cellulose enzymatic hydrolysis. The disadvantage is that the process consumes a lot of energy and invests a lot in equipment.
At present, most of the pretreatment methods are difficult to realize the separation of all components of lignocellulose and efficient enzymatic hydrolysis at the same time.
In addition, traditional pretreatment ideas are often limited to obtaining cellulose that can be converted into ethanol, and do not pay enough attention to the treatment of hemicellulose and lignin

Method used

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  • Lignocellulose acid/alkali coupling pretreatment method
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Examples

Experimental program
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Effect test

Embodiment 1

[0034] Weigh 1000 g of corn stalks with a particle size of 20-80 mm, add 15 L of formic acid (88 wt %) and 150 mL of hydrochloric acid (37 wt %), and place them in a treatment tank. After reacting in a constant temperature water bath at 65° C. and 150 rpm for 3 hours, the reaction slurry was separated from solid to liquid. (1) The liquid component reclaims formic acid and hydrochloric acid through vacuum distillation, and the formic acid recovery rate reaches 92%. Add water 500mL to dissolve hemicellulose hydrolysis sugar under normal temperature and pressure, and utilize high-performance liquid chromatography (HPLC) to analyze and detect (the results are as follows: figure 2 shown), the hemicellulose hydrolysis rate reaches 90%; the water-insoluble lignin is recovered by centrifugation or filtration. (2) The solid component is further treated with ammonia water, the treatment conditions are: concentration of ammonia water 15wt%, solid-liquid ratio 1:8, treatment temperature...

Embodiment 2

[0037] Weigh 1000g of corn stalks with a particle size of 20-80 mesh and put them into a treatment tank, and add 2wt% dilute sulfuric acid solution at a solid-to-liquid ratio of 1:15. After reacting in a pressure cooker at 120° C. for 45 minutes, the reaction slurry was separated into solid and liquid. The liquid component is used for subsequent neutralization treatment; the solid component is then treated with sodium hydroxide solution, the treatment conditions are: sodium hydroxide concentration 2wt%, solid-liquid ratio 1:10, treatment temperature 80°C and reaction time 8h. After the reaction is finished, the solid-liquid separation of the material is carried out. (1) The liquid component is neutralized with the liquid material treated with dilute sulfuric acid, and the water-insoluble lignin produced is recovered by centrifugation or filtration, and the lignin yield reaches 87%; the liquid component is analyzed and detected by HPLC, and the hemicellulose is hydrolyzed The ...

Embodiment 3

[0040] Weigh 1000 g of corn cobs with a particle size of 20 to 80 meshes, add 10 L of formic acid (88 wt%) and 100 mL of hydrochloric acid (37 wt %) and place them in a treatment tank. After reacting in a constant temperature water bath at 60° C. and 150 rpm for 3 hours, the reaction slurry was separated into solid and liquid. (1) The liquid component reclaims formic acid and hydrochloric acid through vacuum distillation, and the formic acid recovery rate reaches 92%. Water is added to dissolve the hemicellulose hydrolyzed sugar, and the hemicellulose hydrolysis rate reaches 91% through HPLC analysis and detection; the water-insoluble lignin is recovered by centrifugation or filtration. (2) The solid components are further treated with ammonia water, the treatment conditions are: ammonia water concentration 15wt%, solid-liquid ratio 1:6, treatment temperature 60°C and reaction time 12h. After the reaction, the material is separated from the solid and liquid, and the liquid co...

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Abstract

The invention relates to a lignocellulose acid / alkali coupling pretreatment method. Lignocellulose is separated into cellulose, hemicellulose and lignin by acid / alkali coupling pretreatment; and simultaneously, lignocellulose components are separated and subjected to high-efficiency enzymolysis and saccharification. The method comprises the steps of lignocellulose pretreatment, component separation, cellulose enzymolysis, solvent recovery and the like. The lignocellulose material is pretreated by formic acid or dilute sulphuric acid and is then subjected to solid-liquid separation, wherein the liquid component is used for recovering hemicellulose hydrolyzed sugar and part of lignin; and the solid component is further treated by ammonia water or a sodium hydroxide solution and is then subjected to solid-liquid separation, the liquid component is used for recovering lignin, and the solid component (cellulose) is subjected to enzymolysis and saccharification. By converting the lignocellulose into cellulose hydrolyzed sugar (glucose), hemicellulose hydrolyzed sugar (xylose and xylooligosaccharide) and lignin, the invention provides a basis for full-biomass utilization and develops a green process route for recovering the pretreatment solvent.

Description

technical field [0001] The invention belongs to the technical field of conversion and utilization of biomass resources, and in particular relates to a lignocellulose acid-base coupling pretreatment method, specifically, using acid-base coupling pretreatment to separate lignocellulose into cellulose, hemicellulose and lignin , while realizing the separation of lignocellulose components and efficient enzymatic saccharification. Background technique [0002] Preparation of biomass energy and bio-based chemicals from lignocellulosic resources and the gradual establishment of a biorefining economic model can alleviate dependence on the petroleum industry and reduce environmental pollution. In the conversion process of lignocellulose, the bioconversion technology based on sugar platform has been favored due to its mild reaction conditions and environmental friendliness. However, how to efficiently hydrolyze complex polysaccharides in lignocellulose still restricts the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C13K13/00C12P19/14
Inventor 齐崴黄仁亮苏荣欣何志敏
Owner TIANJIN UNIV
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