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Clean and safety lignocellulose raw material pretreatment method

A technology of lignocellulosic raw materials and lignocellulose, which is applied in the field of pretreatment of lignocellulosic raw materials, can solve the problems of low saccharification rate of cellulose and long processing cycle, and achieve the requirements of less production, convenient production control and low corrosion resistance requirements. Effect

Active Publication Date: 2016-12-07
NANJING FORESTRY UNIV
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The biological method is to use microorganisms to remove lignin. This method has no pollution and mild treatment conditions, but the treatment period is long and the saccharification rate of cellulose after pretreatment is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0016] In a 15L mechanically stirred stainless steel high-pressure reaction tank, add 10L of reactant containing 1kg corn cob and 10% acetic acid (mass concentration), seal, control the stirring speed at 150r / min, and process at 140°C for 60min. The acetic acid is recovered by evaporation under reduced pressure to obtain the pretreated material. The composition and material yield analysis of the pretreated corn cob showed that the removal rate of hemicellulose was 81%, and the removal rate of lignin was 12%. Mix the above-mentioned pretreatment material with cellulase, add water and pH buffer, mix until the substrate concentration is 10%, control the pH at 4.8, and use 25 FPIU / g of cellulase, at 50°C and 150r / min After 48 hours of enzymatic hydrolysis, the yield of enzymatic hydrolysis was 89%.

Embodiment example 2

[0018] In a 15L mechanically stirred stainless steel high-pressure reaction tank, add 5L of reactants containing 1kg corn stalks and 20% acetic acid (mass concentration), seal it, control the stirring speed at 150r / min, and treat at 150°C for 30min. The acetic acid is recovered by evaporation under reduced pressure to obtain the pretreated material. The composition and material yield analysis of the pretreated corn stalks showed that the removal rate of hemicellulose was 76%, and the removal rate of lignin was 10%. Mix the above-mentioned pretreatment material with cellulase, add water and pH buffer, mix until the substrate concentration is 10%, control the pH at 4.8, and use 25 FPIU / g of cellulase, at 50°C and 150r / min After 48 hours of enzymatic hydrolysis, the yield of enzymatic hydrolysis was 85%.

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Abstract

The invention discloses a clean and safety lignocellulose raw material pretreatment method. The method includes: grinding natural lignocelluloses as a raw material, adopting 10%-20% acetic acid (mass concentration) for pretreatment for 10-60min at 120-150 DEG C, recovering acetic acid by vacuum evaporation to obtain a pretreated material, and adding cellulase to obtain glucose by enzyme hydrolysis. By adoption of the clean and safety lignocellulose raw material pretreatment method, more than 75% of hemicelluloses and a small part of lignin in the natural lignocellulose raw material can be degraded, a chemical inhibition effect of hemicelluloses and lignin on cellulase catalytic hydrolysis is remarkably broken, and cellulase catalytic hydrolysis yield is increased to 85% above. Compared with an existing pretreatment method, the clean and safety lignocellulose raw material pretreatment method has advantages that reaction temperature can be remarkably lowered while heat consumption and resisting substance forming amount are reduced; more importantly, acetic acid is safer and milder than inorganic acid and lower in requirement on corrosion resistance of production equipment, and complete acetic acid recovery can be realized by conventional vacuum evaporation, so that high cleanness, safety and economy are achieved.

Description

1. Technical field [0001] The invention relates to the field of high-efficiency conversion and utilization of biomass, in particular to a clean and safe lignocellulosic raw material pretreatment method. 2. Background technology [0002] my country is rich in agricultural and forestry wastes such as straw, most of which are directly burned, which not only wastes valuable biomass resources, but also causes serious environmental pollution. Utilizing these cheap lignocellulosic resources to produce fermentable sugars, and then transform them into bio-based chemicals, bio-energy and bio-based materials needed by human beings, is an important part of biomass transformation and the development of bio-economy, which is important for the sustainable development of social economy. Sexual development is of great strategic importance. [0003] Lignocellulosic raw materials are rich in cellulose, hemicellulose and lignin components. These three components form a supramolecular compound ...

Claims

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Application Information

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IPC IPC(8): C12P19/02
CPCC12P19/02C12P2201/00Y02E50/10
Inventor 徐勇张红玉余世袁勇强
Owner NANJING FORESTRY UNIV
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