A kind of pretreatment method of lignocellulose

Abstract

The invention relates to the field of bioengineering and the field of chemical engineering, and discloses a pre-treatment method of lignocellulose. The method comprises the step of sequentially performing rinsing impurity removal treatment, extrusion dewatering treatment and steam blasting treatment on lignocellulose raw materials, or sequentially performing rinsing impurity removal treatment, uniform mixing treatment with acid-containing or alkali-containing liquid, extrusion dewatering treatment and steam blasting treatment on the lignocellulose, wherein before the extrusion dewatering treatment, the lignocellulose raw materials are in contact with acid-containing or alkali-containing liquid in at least one treatment process. The method provided by the invention has the advantages that the hemicelluloses recovery and utilization rate and the cellulose enzymolysis conversion rate can be greatly improved; impurities can also be effectively removed; and the operation cost is reduced.

Description

technical field [0001] The invention relates to the fields of bioengineering and chemical industry, in particular to a method for pretreatment of lignocellulose. Background technique [0002] Lignocellulose pretreatment methods include chemical methods, physical methods and biological methods. The purpose is to separate its three components, cellulose, hemicellulose and lignin, to hydrolyze the hemicellulose in lignocellulose, and to make cellulose The ordered structure in the cell changes, increasing the contact area between cellulose and enzyme catalysts. [0003] The current pretreatment methods include steam explosion method, dilute acid warm baking method, ammonia fiber explosion method, carbon dioxide explosion method, wet oxidation method, peroxide method, sulfur dioxide method and other methods. However, many of these methods have not been popularized due to low raw material recovery, environmental pollution, high equipment and operating costs, and complicated opera...

AI Technical Summary

Problems solved by technology

The recovery and utilization rate of hemicellulose by dilute acid warm roasting method is high (generally 70%-85%), but the conversion rate of cellulase hydrolysis is low (generally 50%-60%), and the reaction time is long and the power is low. High cost, and sugar monomers will be derived into fermentation inhibitors such as furfural and formic acid

[0006] In addition, lignocellulosic raw materials are usually mixed with a series of impurities such as more sediment, metal objects not separated by magnetic separation, vulnerable parts dropped from mechanical rotating parts, etc. These impurities will follow the materials into subsequent equipment , it is easy to cause equipment failure, increase the maintenance workload, affect the stability of production and product quality, and at the same time, the introduction of impurities will increase the amount of auxiliary materials, and auxiliary materials will be adsorbed on the body of impurities or directly react with impurities, resulting in Increased dosage of excipients

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