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 i

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

Example Embodiment

[0025] Example 1

[0026] Air-dried corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are pulverized into 40 mesh particles by universal pulverizer 19, and then Load the dilute acid circulation device 10 from the feed port 12, open the valve 1 and valve 2, and inject 0.8% dilute H from the 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 the circulating pump 9, the flow rate is set to 10L / min, the liquid level is located at the upper end of the filter plate 13 during the reaction, at 95 ℃ Circulate the reaction for 4 hours. During the reaction, the liquid part is circulated through the filter plate 13, and the solid material part is blocked by the filter plate 13 and left in the reactor. The liquid part passes through the pump 9 and then returns to the reactor by spraying through the spray hea...

Example Embodiment

[0027] Example 2

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

Example Embodiment

[0029] Example 3

[0030] Air-dried corn stalks (moisture 12.82%, benzene alcohol extract 17.44%, cellulose 40.08%, hemicellulose 20.03%, lignin 19.95%, ash 5.52%) are pulverized into 50 mesh particles by universal pulverizer 19, and then Load the dilute acid circulation device 10 from the feed port 12, open the valve 1 and valve 2, and inject 0.98% dilute H from the 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 the nitrogen valve 18, and pass N from the nitrogen cylinder 17 2 , Pressurize to 2.5MP, start the circulating pump 9 and set the flow rate to 10L / min. During the reaction, the liquid level is at the upper end of the filter plate 13, and the reaction is circulated at 105°C for 2 hours. The liquid part is circulated through the filter plate 13 during the reaction. The material part is blocked by the filter plate 13 and remains in the reactor. The liquid part passes throu...

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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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