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A pretreatment method to promote efficient utilization of biomass

A pretreatment and biomass technology, applied in the field of agricultural and forestry biomass reuse, can solve the problems of difficult recycling of catalysts, adverse environmental impacts, high energy consumption, etc., and achieve the effects of high usable value, shortened processing time, and small damage

Active Publication Date: 2022-05-27
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current pretreatment of lignocellulose includes acid pretreatment, alkaline pretreatment, high temperature hydrothermal pretreatment and organic solvent pretreatment, etc., but it is difficult to take into account energy consumption, pretreatment efficiency, waste liquid treatment cost and environmental protection. issues such as inertness, which largely limit the utilization of lignocellulosic materials
For example: CN105002232A discloses a combined pretreatment process for improving lignocellulose saccharification effect. This patent discloses a lignocellulose pretreatment method and saccharification application of cellulose. Part of the lignin and hemicellulose components in the lignocellulosic raw material are removed, and the lignocellulose structure is further loosened by ultrasonic pretreatment, which greatly improves the saccharification efficiency of lignocellulose, but this invention only considers the saccharification of cellulose , the pretreatment process severely damages lignin and hemicellulose in raw materials; CN104774876A discloses a method for comprehensive utilization of lignocellulosic biomass, which discloses a pretreatment means and comprehensive utilization of lignocellulosic biomass The method is specifically: crushing lignocellulose, adding sulfite to cook, and then separating solid and liquid, saccharifying the obtained cellulose solid to produce ethanol, drying the liquid to obtain sulfonated lignin, so as to realize efficient utilization of lignocellulose, However, the pretreatment and application process is complicated and the operation is cumbersome, and the pretreatment needs to be carried out at high temperature, and the energy consumption is high; CN110093172A discloses a comprehensive utilization method of biomass materials, which discloses a kind of pretreatment of biomass materials And the method of application, specifically: under supercritical conditions, use composite metal catalysts and microwave assistance to convert biomass materials into activated carbon, hydrogen-rich gas and liquid fuels, but this process needs to be carried out under high temperature and high pressure, and consumes high energy. And the use of organic solvents in the process will have adverse effects on the environment
It can be seen that the currently used biomass pretreatment methods still have disadvantages such as high energy consumption, low yield, and difficult recovery of catalysts. Therefore, it is necessary to develop a wood fiber with low energy consumption, high yield, and better performance of each component. Primer pretreatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix 40-60 mesh lignocellulosic raw materials with a solution of p-toluenesulfonic acid with a concentration of 70 wt%, the mass concentration of lignocellulose raw materials is 6%, and the reaction is carried out at 80 °C and stirring at 500 rpm for 15 min. , most of the lignin in the lignocellulosic raw material is removed; after the reaction, a cloth funnel is used for solid-liquid separation to obtain solid material and liquid material; the solid material is a fiber raw material containing residual lignin, and then 2000 The fiber raw material containing residual lignin was repeatedly rinsed with ml distilled water until the p-toluenesulfonic acid in the fiber raw material was completely washed, and then the treated fiber raw material was subjected to a short-time (10s) ultrasonic treatment in deionized water, and then the It is freeze-dried to obtain a fiber product with a loose structure; the liquid material mainly includes hemicellulose, cellulose degradation produc...

Embodiment 2

[0021] Mix 40-60 mesh lignocellulosic raw materials with a solution of p-toluenesulfonic acid with a concentration of 80 wt%, and the mass concentration of lignocellulose raw materials is 6%, and the reaction is carried out at 80 °C and stirring at 500 rpm for 30 min. , most of the lignin in the lignocellulosic raw material is removed; after the reaction, a cloth funnel is used for solid-liquid separation to obtain solid material and liquid material; the solid material is a fiber raw material containing residual lignin; The fiber raw material containing residual lignin was repeatedly rinsed with ml distilled water until the p-toluenesulfonic acid in the fiber raw material was completely washed, and then the treated fiber raw material was subjected to a short-time (10s) ultrasonic treatment in deionized water, and then the It is freeze-dried to obtain a fiber product with a loose structure; the liquid material mainly includes hemicellulose, cellulose degradation products and the...

Embodiment 3

[0026]Mix 40-60 mesh lignocellulosic raw materials with a solution of p-toluenesulfonic acid with a concentration of 60 wt%, the mass concentration of lignocellulose raw materials is 6%, and the reaction is carried out at 70 °C and stirring at 500 rpm for 15 min. , most of the lignin in the lignocellulosic raw material is removed; after the reaction, a cloth funnel is used for solid-liquid separation to obtain a solid material and a liquid material; the solid material is a fibrous raw material containing residual lignin; The fiber raw material containing residual lignin was repeatedly washed with ml distilled water until the p-toluenesulfonic acid in the fiber raw material was completely washed, and then the treated fiber raw material was subjected to a short-time (10s) ultrasonic treatment in deionized water, and then the It is freeze-dried to obtain a fiber product with a loose structure; the liquid material mainly includes hemicellulose, cellulose degradation products and th...

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Abstract

The invention discloses a pretreatment method for promoting high-efficiency utilization of biomass. The invention comprises the following steps: mixing lignocellulose raw materials with p-toluenesulfonic acid solution, heating, stirring at a constant temperature for a certain period of time at a fixed stirring speed, and separating solid and liquid to obtain solid materials, which contain residual lignin Fiber samples; use distilled water to wash the fiber samples with residual lignin until the p-toluenesulfonic acid is completely washed, and then perform short-term ultrasonic treatment and freeze-drying in sequence to obtain fully decomposed fiber materials. The present invention pretreats lignocellulosic raw materials under mild conditions, the loss of each component is small, and the obtained lignin can be used for high-value utilization; moreover, the short-time ultrasonic pretreatment of the separated fiber samples will make The cellulose structure becomes looser, and the fiber material with loose structure has a larger contact area during enzymatic hydrolysis, more complete enzymatic hydrolysis, better fermentation, and higher ethanol yield.

Description

technical field [0001] The invention relates to the technical field of agricultural and forestry biomass reuse, in particular to a pretreatment method for promoting efficient utilization of biomass. Background technique [0002] In recent years, petrochemical resources have been increasingly depleted, and the extensive use of petroleum-based products has made environmental problems such as global warming and smog increasingly prominent. At present, lignocellulose resources are the most abundant natural renewable resources on earth, and resources such as trees and crop straws are extremely abundant. Therefore, lignocellulose derivatives are one of the most suitable substitutes for petroleum-based products. However, the existing lignocellulose has a complex structure, and has problems such as difficulty in utilization and low conversion rate, which leads to its high utilization cost. In order to improve the high-value utilization rate of lignocellulose, most of the lignocellu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12P19/14C12P19/00C12R1/865
CPCC12P7/10C12P19/14C12P19/00C12P2201/00Y02E50/10
Inventor 吉海瑞傅晓童董翠华庞志强
Owner QILU UNIV OF TECH