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Method for separating main ingredients of arboret stalk by low-intensity steam explosion

A low-intensity, steam technology, applied in biofuels, fermentation and other directions, can solve the problems of high pressure resistance and other performance requirements of pressure maintenance time equipment, less than 50% utilization rate of lignocellulosic raw materials, and inability to make full use of it. Achieve high-value utilization, reduce extraction and separation costs, and be easy to recycle

Inactive Publication Date: 2011-06-15
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Under the currently reported steam explosion conditions, too high steam pressure and too long cooking time not only high energy consumption, but also most of the hemicellulose and lignin in straw and wood have been degraded into monosaccharides or It is further transformed into furfural, acetic acid, phenols and other substances. These degradation products have a significant inhibitory effect on the subsequent enzymatic hydrolysis and saccharification of cellulose to produce bioethanol, making the utilization rate of lignocellulose raw materials less than 50%, which cannot be fully utilized; Moreover, the higher vapor pressure and longer pressure maintenance time have higher requirements on the pressure resistance and other performance of the equipment, and the energy demand is also greater, which increases the capital investment.

Method used

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  • Method for separating main ingredients of arboret stalk by low-intensity steam explosion
  • Method for separating main ingredients of arboret stalk by low-intensity steam explosion
  • Method for separating main ingredients of arboret stalk by low-intensity steam explosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The air-dried stalks of Huzhizi are removed from impurities and chips, and the size of the material is less than 30mm×5mm×5mm (length, width, thickness); then divided into two groups: the experimental group and the control group, and the experimental group is subjected to low-intensity steam explosion, and the steam explosion pressure is 0.8 MPa, pressure maintenance time is 60 seconds; the control group does not undergo steam explosion, the steam explosion product of the experimental group and the material of the control group are respectively ground by a disc mill; The elemental components are subjected to pressurized rapid extraction and separation. The weight ratio of water and blasting materials is 15:1. The pressurization is carried out for 5 minutes during the extraction, and the pressurization is stopped for 5 minutes. The maximum pressure of the pressurization is 0.2MPa. The polysulfone membrane with a molecular weight of 2000 is used to intercept and separate h...

Embodiment 2

[0044] Air-dried Salix stalks remove impurities and shavings, the size of the material is less than 30mm×10mm×10mm (length, width, thickness), steam explosion pressure is 0.9MPa, and the pressure maintenance time is 120 seconds for steam explosion; the steam explosion product is ground by a disc mill crushing; use warm water at 55°C as solvent to carry out pressurized rapid extraction and separation of hemicellulose components, the weight ratio of water and blasting materials is 15:1, pressurize for 10 minutes during extraction, stop pressurization for 10 minutes, and the maximum pressure of pressurization is 0.3 MPa, circulating for 1.5 hours, the extract was separated by ultrafiltration with a polysulfone membrane with a molecular weight cut-off of 2000, and the hemicellulose was separated. After ultrafiltration and concentration, the water was recycled, and the concentrate was dried to obtain hemicellulose. The hemicellulose extraction rate was 89.6%.

[0045] The solid resi...

Embodiment 3

[0048] Air-dried caragana stems are removed and shavings, the material size is less than 30mm×10mm×10mm (length, width, thickness); the steam explosion pressure is 0.7MPa, and the pressure maintenance time is 60 seconds for steam explosion; the steam explosion product is ground by a disc mill crushing; use warm water at 50°C as solvent to extract and separate the hemicellulose components quickly under pressurization, the weight ratio of water and blasting materials is 15:1, pressurize for 5 minutes during extraction, stop pressurizing for 5 minutes, and the maximum pressure of pressurization is 0.1 MPa, circulated for 1 hour, the extract was separated by ultrafiltration with a polysulfone membrane with a molecular weight cut-off of 2000, and the hemicellulose was separated. After ultrafiltration and concentration, the water was recycled, and the concentrate was dried to obtain hemicellulose. The hemicellulose extraction rate was 85.7%.

[0049] The solid residue after hemicellu...

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Abstract

The invention relates to a method for separating shrub stalks containing lignocellulose into elementary compositions such as lignin, hemicellulose, cellulose and so on after pretreatment. The method comprises the following steps of (1) low-intensity vapor explosion pretreatment, wherein the vapor explosion pressure is between 0.5 and 1.2 MPa and the pressure maintaining time is between 20 and 150seconds; (2) extraction and separation of the hemicellulose;(3) extraction and separation of the lignin; and (4) zymohydrolysis and saccharification of the cellulose. The method utilizes the low-intensity vapor explosion pretreatment to extract and separate the hemicellulose and the lignin, obtains the cellulose and then prepares biological ethanol through zymohydrolysis of the cellulose, can convert carbon from wood biomass of the shrub stalks into useful products to the maximum degree, particularly greatly improves the conversion rate of converting the cellulose into ethanol, reduces the conversion cost, fully utilizes the lignocellulose resources, does not use acid, alkali or sulfur-bearing and chlorine-bearing chemical products during the processing procedure, and is a green and pollution-free separation technology.

Description

technical field [0001] The invention relates to the field of biomass chemistry and chemical industry, in particular to a method for separating lignocellulose-containing biomass (especially from shrub stems) into lignin, hemicellulose and cellulose after low-intensity steam explosion pretreatment The method of basic ingredients. Background technique [0002] With the development of industrialization in the world, the demand for petroleum as the main fuel and the raw material of chemicals has increased sharply, and the problem of energy shortage has become increasingly serious. At the same time, fossil energy has caused serious damage to the environment. Therefore, researching and finding environmentally friendly alternatives to petroleum energy has become one of the important directions of world technology development. Compared with the energy produced by burning fossil fuels, biomass energy is called "CO2-neutral fuel" because the consumption of a certain amount of biomass ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10
CPCY02E50/16Y02E50/10
Inventor 蒋建新王堃孙润仓刘圣英朱莉伟马雅奇
Owner BEIJING FORESTRY UNIVERSITY
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