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Method for pretreating biomass raw materials

A biomass raw material and pretreatment technology, which is applied in fiber raw material treatment, textile and papermaking, etc., to achieve the effect of simple preparation, less by-products and convenient preparation

Inactive Publication Date: 2013-05-01
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no literature report on the application of electrolyzed water in the field of biomass pretreatment

Method used

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  • Method for pretreating biomass raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1. Two-step pretreatment of corn stalks with acidic electrolyzed water and alkaline electrolyzed water

[0038] The aqueous solution containing 1‰NaCl was electrolyzed for 30min at a voltage of 40V (the current changes during the electrolysis process and gradually increases, so a constant voltage electrolysis method is used, the same below), and the pH value at the anode is 2.3, and the redox Acidic electrogenerated functional water with a potential of 1200mV; alkaline electrogenerated functional water with a pH of 12.0 and an oxidation-reduction potential of -900mV at the cathode. Weigh 2.0g of corn stalk powder dry weight (among them, 35.23% cellulose, 24.75% hemicellulose, 18.9% lignin, 21.12% of others) with a particle diameter of 40-80 mesh, and put it into a stainless steel continuous tube with a volume of 40ml. The reactor is filled with the acidic electrogenerated functional water, and the tubular reactor is placed in an oil bath with a temperature of 160°...

Embodiment 2

[0039] Example 2, two-step pretreatment of bagasse by acidic electrolyzed water and alkaline electrolyzed water

[0040] Electrolyze the aqueous solution containing 2‰NaCl in an ice-water bath (0°C) at a voltage of 60V for 30 minutes (the current changes during the electrolysis process and gradually increases, so the constant voltage electrolysis method is used, the same below), and the pH value is obtained The acidic electrogenerated functional water with a pH value of 2.0 and an oxidation-reduction potential of 1260mV and the alkaline electrogenerated functional water with a pH value of 12.6 and an oxidation-reduction potential of -992mV. Take by weighing 2.0g of bagasse powder dry weight (wherein, cellulose 35.79%, hemicellulose 25.78%, lignin 20.01%, other 18.42%) with a particle diameter of 40-80 mesh, and put it into a stainless steel continuous tube type filter with a volume of 40ml. The reactor is filled with the acidic electrogenerated functional water, and the tubula...

Embodiment 3

[0041] Example 3, Acidic electrolyzed water and alkaline electrolyzed water two-step method for pretreatment of corncobs

[0042] 2L of aqueous solution containing 1‰NaCl is circulated by a water pump through the NdFeB magnetic field channel with a strength of 10000Gs in the normal direction, and the cross-sectional area of ​​the channel is 5cm 2 , with a length of 20cm and a velocity of 2.5m·s -1 , the time is 3h. The magnetized electrolyte was electrolyzed in an ice-water bath for 30 minutes at a voltage of 40V to obtain acidic electrogenerated functional water with a pH value of 2.2 and an oxidation-reduction potential of 1220mV and an alkaline functional water with a pH value of 12.5 and an oxidation-reduction potential of -967mV. Electric functional water.

[0043] Take by weighing 2.0g of corn cob powder dry weight (wherein, cellulose 31.24%, hemicellulose 41.16%, lignin 12.53%, other 15.07%) with a particle diameter of 40-80 mesh, put into a stainless steel continuous...

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Abstract

The invention discloses a method for pretreating biomass raw materials, comprising the following steps of: (1) carrying out continuous hydrolysis reaction on the biomass raw materials in acidic electrolyzed functional water so that hemicelluloses contained in the biomass raw materials are transformed into xylose and xylo-oligosaccharides; and (2) continuously carrying out the continuous hydrolysis reaction on residuals remained from the step (1) in alkalic electrolyzed functional water to eliminate xylogen contained in the residuals, and separating to obtain the xylogen. The method for pretreating the biomass raw materials in the electrolyzed functional water has the advantages of convenient preparation, low cost and easy use of the electrolyzed functional water; and in addition, the invention adopts a continuous pretreating reaction mode, can both realize the effectively separation of the xylogen and the hemicelluloses compared with batch reaction and eliminate leached xylogen and hemicelluloses in time through the continuous pretreatment of the electrolyzed functional water without causing the further reaction of hydrolysis products, has few side products and high yield. The method can be used for pretreating the biomass raw materials, and can ensure that the elimination rate of the hemicelluloses maximally reaches 97 percent and the elimination rate of the xylogen maximallyreaches 92 percent.

Description

technical field [0001] The invention belongs to the field of biomass conversion and utilization, and in particular relates to a method for stepwise pretreatment of biomass with acidic and alkaline electrogenerated functional water. Background technique [0002] Cellulosic biomass is the world's largest renewable resource. Using biomass as a precursor to produce renewable energy and other bulk compounds can not only alleviate the current energy crisis, but also alleviate the current environmental pollution problem. At present, the biomass industry is becoming another new leading industry leading the technological innovation and the development of advanced productive forces in the contemporary world. In order to be in an advantageous position in the global competition of the biomass economy, it is necessary to break through the bottleneck problem that restricts the development of the biomass industry - the separation and transformation of biomass components. The complex chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00
Inventor 孙君社裴海生刘莉张秀清
Owner CHINA AGRI UNIV