Method for pre-treating lignocellulose raw material and for preparing reducing sugar by conversion

Abstract

The invention relates to a method for pre-treating lignocellulose raw material and for preparing reducing sugar by conversion. With liquid-solid ratio of 5-50, lignocellulose is treated for 1-10h in a mixed solution of 0-5% of sodium hydroxide by mass and 0-5% of hydrogen peroxide by mass; solid residue obtained by treating is washed by using water, and is dried by baking; the obtained material is treated under a liquid-solid ratio of 5-50, an acid hydrolysis time of 10-120min, an acid hydrolysis temperature of 30-150min, and a sulfuric acid mass concentration of 0-10%, such that a solid residue is obtained; a pH value is regulated to 7; and the obtained material is dried by baking. With the treatment process, lignin can be effectively removed, and hemicellulose is hydrolyzed under a dilute acid condition, such that pentose is obtained. With further reactions, products with high added value can be obtained. With a sample treated with the process, ineffective adsorption upon cellulase is reduced, and a conversion rate of cellulose in preparing ethanol can reach 67%. Therefore, a production cost is relatively reduced.

Description

technical field [0001] The invention relates to a method for pretreating lignocellulosic raw materials into reducing sugars, in particular to a pretreatment method capable of effectively removing lignin in sawdust and efficiently hydrolyzing hemicellulose to obtain reducing sugars. Background technique [0002] As my country's crude oil consumption reached 379 million tons in 2009, and the dependence on crude oil imports exceeded 50% for the first time, the consumption of traditional energy and the safety of its use are threatened by reality. Due to the non-renewable and limited reserves of fossil resources, it is urgent to create new alternative energy sources. At the same time, the convening of the third World Climate Conference marks the arrival of the low-carbon era, and puts forward new stringent requirements for the clean utilization of fossil fuels. Obviously, adopting biomass energy as an alternative energy source will produce clean, circular and reusable features. ...

AI Technical Summary

Problems solved by technology

The main reasons for these problems in the prior art are as follows: (1) A single conversion technology cannot realize the simultaneous utilization of the three components of cellulose, hemicellulose and lignin in the same cellulose raw material system, which is easy to cause waste of resources (2) Lack of key technological breakthroughs in the conversion of cellulose raw materials

The raw material pretreatment of the existing technology has long been applied to the paper industry pretreatment technology, which is actually a highly polluting technology

The enzymatic hydrolysis of cellulose in the prior art mainly follows the traditional process of starch fermentation, which easily causes the problem of high pretreatment cost and low enzymatic hydrolysis efficiency; (3) the prior art has not yet established a system integration for the pretreatment of cellulose raw materials With the supporting system, each conversion process cannot be effectively combined

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