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Method for pretreating cellulosic biomass

A technology of cellulose and biomass, applied in the chemical field, can solve the problems of large water consumption, high energy consumption of steam explosion treatment, and easy production of by-products

Inactive Publication Date: 2014-05-14
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method does not need to add steam to carry out pretreatment under normal temperature conditions, but because the raw material needs to be coarsely crushed to 20-60 mesh, and the wet crushing time is relatively long, therefore, the water consumption is large, the mechanical energy consumption is high, and continuous pretreatment cannot be realized. processing, difficult to industrialize
[0018] Therefore, the problems existing in the method for pretreating cellulosic biomass can be attributed to: 1) the energy consumption of steam explosion treatment is high, lignin removal is difficult, and it is difficult to realize continuous production and industrialization; 2) conventional acid or alkali The treatment conditions are harsh, the water consumption is large, the energy consumption is high, and by-products are easily produced; 3) the efficiency of simple mechanical treatment (such as crushing or wet grinding) is low, the energy consumption is high, and it is difficult to produce on a large scale

Method used

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  • Method for pretreating cellulosic biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The air-dried corn stalks were cut to 3-5 cm with a guillotine, and loaded into a twin-screw extruder (Hebei Tianzheng Screening and Pulping Equipment Co., Ltd., TEP80) through the feed port. Water is added through the feed port for washing, and the water content in the extruded material can be adjusted through the liquid outlet. In this embodiment, the water content is controlled so that the material concentration is about 50% (ie, the mass of water included is equivalent to 1 times the mass of the dry material). Add a sodium hydroxide solution with a concentration of 6% through the liquid inlet 3, and adjust the final concentration and consumption of the sodium hydroxide solution appropriately through the liquid outlet and the liquid inlet. In this embodiment, the amount of sodium hydroxide solution is controlled so that the material concentration is further reduced to about 33% (that is, the quality of the used sodium hydroxide solution is equivalent to 1 times the q...

Embodiment 2

[0082] The air-dried corn stalks were preliminarily crushed to 1-3 cm with a pulverizer, and loaded into a twin-screw extruder (Hebei Tianzheng Screening and Pulping Equipment Co., Ltd., TEP80) through the feed port. Water is added through the feed port for washing, and the water content in the extruded material can be adjusted through the liquid outlet. In this embodiment, the water content is controlled so that the material concentration is about 45%. Add a 10% sodium hydroxide solution through the liquid inlet 3, and adjust the final concentration and dosage of the sodium hydroxide solution appropriately through the liquid outlet and the liquid inlet. In this embodiment, the amount of sodium hydroxide solution is controlled so that the material concentration is further reduced to about 35% (that is, the quality of the used sodium hydroxide solution is equivalent to 0.6 times the quality of the dry material).

[0083] The rotational speed of the spindle of the twin-screw ex...

Embodiment 3

[0088] The air-dried corn stalks were preliminarily crushed to 1-3 cm with a pulverizer, and loaded into a twin-screw extruder (Hebei Tianzheng Screening and Pulping Equipment Co., Ltd., TEP80) through the feed port. Water is added through the feed port for washing, and the water content in the extruded material can be adjusted through the liquid outlet. In this embodiment, the water content is controlled so that the material concentration is about 50%. Add a sulfuric acid solution with a concentration of 1% through the liquid inlet 2, and adjust the final concentration and dosage of the sulfuric acid solution appropriately through the liquid outlet and the liquid inlet. In this embodiment, the amount of sulfuric acid solution is controlled so that the concentration of the material is further reduced to about 35% (that is, the mass of the sulfuric acid solution used is equivalent to 0.8 times the mass of the dry material).

[0089] The rotational speed of the spindle of the t...

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Abstract

The invention relates to relates to a method for pretreating cellulosic biomass, which comprises the following steps: before or after the cellulosic biomass is mechanically crushed, or when the cellulosic biomass is mechanically crushed, the cellulosic biomass is contacted with a chemical drug capable of degrading the cellulosic biomass, and the heat generated due to mechanical crushing is used for increasing the temperature of a mixture of the cellulosic biomass and the chemical drug.

Description

technical field [0001] The invention relates to the fields of chemistry and bioenergy. In particular, the present invention relates to a method for pretreating cellulosic biomass, which comprises, before, simultaneously or after mechanically crushing the cellulosic biomass, combining the cellulosic biomass with a degradable The chemical contact of the cellulosic biomass and the heat generated by the mechanical disintegration is used to increase the temperature of the mixture of the cellulosic biomass and the chemical. Background technique [0002] With the increasing shortage of petrochemical resources, the development and utilization of biological resources, especially agricultural and forestry wastes (such as corn stalks, rice straw, wheat straw, bagasse, wood) and other lignocellulosic biomass materials into liquid fuels have become more and more research topics. hot spot. Converting these waste biomass into renewable liquid fuels such as ethanol, butanol, and biodiesel...

Claims

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Application Information

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IPC IPC(8): D21C1/00C12P19/14C12P19/02
CPCY02P20/133
Inventor 王海松刘超牟新东艾弗特·范德海德于光李滨
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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