Pretreatment method for promoting efficient utilization of biomass

Abstract

The invention discloses a pretreatment method for promoting efficient utilization of biomass. The pretreatment method comprises the steps of mixing lignocellulose raw material with a p-toluenesulfonicacid solution, heating, stirring at a constant temperature at a fixed stirring speed for a certain period of time, and carrying out solid-liquid separation to obtain a solid material which is a fibersample containing residual lignin; washing the fiber sample with residual lignin by using distilled water until p-toluenesulfonic acid is completely cleaned, and then sequentially carrying out short-time ultrasonic treatment and freeze drying to obtain a fully defibering fiber material. The lignocellulose raw material is pretreated under mild conditions, the loss of each component is small, and the obtained lignin can be subjected to high-value utilization; moreover, short-time ultrasonic pretreatment is carried out on the separated fiber sample, so that the cellulose structure becomes more loose, and the fiber material with the loose structure is large in contact area, more sufficient in enzymolysis, better in fermentation and higher in ethanol yield during enzymolysis.

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 high-efficiency utilization of biomass. Background technique [0002] In recent years, the depletion of petrochemical resources and the extensive use of petroleum-based products have made environmental problems such as global warming and smog increasingly prominent. At present, lignocellulose resources are the most abundant natural renewable resources on the earth, and resources such as trees and crop straws are extremely rich. Therefore, lignocellulose derivatives are one of the most suitable substitutes for petroleum-based products. However, the existing lignocellulose has a complex structure, has problems such as difficulty in utilization and low conversion rate, which leads to high utilization costs. In order to improve the high-value utilization of lignocellulose, most of the lignocellulose needs to be pret...

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