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Combined pretreatment method of wood cellulose and system thereof

A lignocellulose and pretreatment technology, applied in fiber raw material processing, textile and papermaking, etc., can solve the problems of low hydrolysis rate of hemicellulose, low lignin removal rate, high power cost consumption, etc. Conversion rate, cellulose enzymatic hydrolysis conversion rate reduction, the effect of reducing enzyme dosage

Inactive Publication Date: 2008-07-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the hemifiber hydrolysis rate of dilute acid warm roasting method is also not high (70%~80%), and lignin removal rate is low, and the reaction time of dilute acid warm roasting method is longer, and power cost consumption is too large, and longer The reaction time causes the sugar monomers to further produce fermentation inhibitors such as furfural, formic acid, acetic acid, and hydroxymethylfurfural, which affect subsequent enzymatic hydrolysis

Method used

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  • Combined pretreatment method of wood cellulose and system thereof
  • Combined pretreatment method of wood cellulose and system thereof
  • Combined pretreatment method of wood cellulose and system thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Air-dried corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash content 5.52%) are pulverized into 40 mesh particles through universal pulverizer 19, then Load dilute acid circulation device 10 from feed port 12, open valve 1, valve 2, inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start circulation pump 9, flow rate is set to 10L / min, liquid level is positioned at the upper end of filter plate 13 during reaction, at 95 ℃ Circulation reaction for 4 hours, during the reaction, the liquid part is circulated through the filter plate 13, the solid material part is blocked by the filter plate 13 and left in the reactor, and the liquid part passes through the pump 9 and then returns to the reactor by spraying the spray head 14 Middle; after the reaction finishes, close valve ...

Embodiment 2

[0028] Air-dried corn stalks (12.82% of moisture, 17.44% of benzene alcohol extract, 40.08% of cellulose, 20.03% of hemicellulose, 19.95% of lignin, 5.52% of ash content) are pulverized into 50 mesh particles through universal pulverizer 19, and then Load dilute acid circulation device 10 from feed port 12, open valve 1, valve 2, inject 0.8% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1:10; open valve 3, valve 4, close valve 1, valve 2, start circulation pump 9, flow rate is set to 10L / min, liquid level is positioned at the upper end of filter plate 13 during reaction, at 90 ℃ Circulation reaction for 4 hours, during the reaction, the liquid part is circulated through the filter plate 13, the solid material part is blocked by the filter plate 13 and left in the reactor, and the liquid part passes through the pump 9 and then returns to the reactor by spraying the spray head 14 Middle; after the reaction ...

Embodiment 3

[0030] Air-dried corn stalks (12.82% of moisture, 17.44% of benzene alcohol extract, 40.08% of cellulose, 20.03% of hemicellulose, 19.95% of lignin, 5.52% of ash content) are pulverized into 50 mesh particles through universal pulverizer 19, and then Load dilute acid circulation device 10 from feed port 12, open valve 1, valve 2, inject 0.98% dilute H from acid storage tank 15 2 SO 4 In the reactor, corn stover and dilute H 2 SO 4 The solid-liquid ratio is 1: 6; Open valve 3, valve 4, close valve 1, open nitrogen valve 18, pass into N from nitrogen cylinder 17 2 , pressurize to 2.5MP, start the circulation pump 9, set the flow rate to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, and circulate the reaction at 105°C for 2h, the liquid part circulates through the filter plate 13 during the reaction, and the solid Part of the material is blocked by the filter plate 13 and left in the reactor, and the liquid part passes throug...

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Abstract

The invention discloses a combined preprocessing method of lignocellulose. The lignocellulose is arranged in a recycle reactor after being crushed, and dilute acid is injected; a recycle pump starts up, the circular reaction is acted under the temperature ranging from 50 DEG C to 200 DEG C, and the obtained hydrolysate is disacidified and then is used for ferment after the reaction is finished; the surplus lignocellulose in the recycle reactor is put in a globe mill for ball milling through adding lye after the surplus lignocellulose is washed, and the surplus lignocellulose is used in subsequent zymohydrolysis after ball milling and alkali removing. The invention effectively increases the hemicellulose percent conversion, the lignin removal rate and the cellulose zymohydrolysis percent conversion in the lignocellulose, reduces fermentation inhibition products, and reduces the enzyme usage when in zymohydrolysis, shortens the reaction time and increases the sugar consistence at the same time; in addition, the invention can set the water consumption during the preprocessing according to the needs of subsequent ferment consistence.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method and system for pretreatment of lignocellulose by combining dilute acid circulation and alkaline ball milling. Background technique [0002] Lignocellulose pretreatment refers to the use of chemical and physical methods to separate its three components, cellulose from lignin and hemicellulose. At the same time, the internal hydrogen bonds of cellulose are opened to become amorphous cellulose, some glycosidic bonds are broken, the degree of polymerization is reduced, hemicellulose is hydrolyzed into monosaccharides such as xylose and arabinose, and the subsequent enzymatic hydrolysis efficiency is improved. [0003] The current pretreatment methods include concentrated acid method, dilute acid warm baking method, alkali treatment method, sulfur dioxide method, peroxide method, steam explosion method, ammonia fiber explosion method, carbon dioxide explosion meth...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 黄和严立石张红漫黄之初贾红华陈敬文林增祥高振
Owner CHINA PETROLEUM & CHEM CORP
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