A method for pretreatment of lignocellulosic biomass

A lignocellulosic and biomass technology, applied in the field of biomass energy conversion and utilization, can solve the problems of restricting large-scale industrial application, difficulty in large-scale pretreatment equipment, narrow adaptability of raw materials, etc., and achieve the goal of being suitable for large-scale industrial application, Reduce equipment requirements and environmental pressure, taking into account the effect of energy consumption and economy

Active Publication Date: 2019-06-25
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the existing pretreatment methods can effectively break the lignocellulose structure and increase the subsequent enzymatic hydrolysis and fermentation efficiency, the use of liquid acid and alkali will cause corrosion and difficult recovery problems, and sulfite pretreatment will cause gas-liquid pollution However, hydrothermal pretreatment has the problems of high energy consumption and narrow adaptability of raw materials. Using steam explosion pretreatment requires additional costs for the removal of enzymatic inhibitors, and it is difficult to scale up pretreatment equipment. These problems limit the existing pretreatment. Large-scale industrial application of the method

Method used

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  • A method for pretreatment of lignocellulosic biomass

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Effect test

Embodiment 1

[0021] Using pennisetum with a particle size of 0.5mm as the raw material, in the reactor, add the raw material, solid alkali catalyst and water at a mass ratio of 1:0.5:25, react at 150°C for 10 minutes, pass through a 80-mesh sieve, and collect the remaining The raw material slag on the sieve, the under-sieve is separated by solid-liquid again, and the solid obtained is a solid alkali catalyst; and the raw material slag collected after the pretreatment of the previous step is placed in the acetic acid / sodium acetate buffer solution with a pH value of 4.8, Add cellulase according to the dry weight of 40FPU / g raw material, enzymolyze at 50°C for 72h, and the enzymatic hydrolysis rate of cellulose is 86.3%.

Embodiment 2

[0027] Using pennisetum with a particle size of 2mm as the raw material, in the reactor, add the raw material, solid alkali catalyst and water at a mass ratio of 1:0.1:5, react at 80°C for 120 minutes, pass through a 80-mesh sieve, collect and leave in the sieve The raw material slag on the net, the under-sieve material is separated through solid-liquid again, and the solid obtained is a solid alkali catalyst; and the raw material slag collected after the previous step pretreatment is placed in the acetic acid / sodium acetate buffer solution with a pH value of 4.8, press 40FPU / g dry weight of raw material was added with cellulase, and enzymolysis was carried out at 50°C for 72 hours, and the enzymatic hydrolysis rate of cellulose was 67.1%.

Embodiment 3

[0029] Using pennisetum with a particle size of 0.5mm as the raw material, in the reactor, add the raw material, solid alkali catalyst and water at a mass ratio of 1:0.2:20, react at 110°C for 80 minutes, pass through an 80-mesh sieve, and collect the remaining The raw material slag on the sieve, the under-sieve is separated by solid-liquid again, and the solid obtained is a solid alkali catalyst; and the raw material slag collected after the pretreatment of the previous step is placed in the acetic acid / sodium acetate buffer solution with a pH value of 4.8, Add cellulase according to the dry weight of 40FPU / g raw material, enzymolyze at 50°C for 72h, and the enzymatic hydrolysis rate of cellulose is 92.2%.

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Abstract

The invention discloses a method for pretreating lignocellulose biomass. According to the method, the raw material lignocellulose biomass with the particle size of 0.5-2mm is pretreated in a hydrothermal environment by using solid alkali as a catalyst to effectively catalyze the stripping degradation of the lignin and the dissolution separation of the hemicellulose in the lignocellulose, thereby breaking the compact structure of the lignocellulose. The separated components can be easily recovered and utilized, and a small amount of inhibitor is generated, thereby being beneficial to converting the lignocellulose biomass into the raw material which is suitable for subsequent enzymolysis fermentation for sugar production. Since the calcium magnesium composite metal oxide solid alkali catalyst can be recovered and recycled, the cost is effectively saved, and the reaction conditions are mild, thereby lowering the facility request and environmental pressure. Thus, the method gives consideration to both energy consumption and economical efficiency, is suitable for large-scale industrial application, and has commercialization potential.

Description

Technical field: [0001] The invention relates to the technical field of biomass energy conversion and utilization, in particular to a method for pretreating lignocellulosic biomass. Background technique: [0002] The non-renewable and massive consumption of fossil fuels has led to the continuous deterioration of energy supply and ecological environment, which has aroused people's attention to the research and development of environmentally friendly renewable energy. In this context, lignocellulosic biomass refining based on the "sugar platform" to produce fuels and chemicals that can replace petroleum products has received increasing attention. [0003] Lignocellulose is a natural polymer complex produced by plants through photosynthesis. It is the most abundant biomass resource in nature. It is mainly composed of cellulose, hemicellulose and lignin. Complex three-dimensional structure of space. Due to the crystalline structure of cellulose and the reticular embedding of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14C08H7/00C08B37/14
CPCC08B37/14C08H6/00C12P19/14C12P2201/00
Inventor 袁振宏谭雪松庄新姝赵月亓伟余强
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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