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Maize straw pretreatment method

A corn stalk and pretreatment technology, which is applied in the production and fermentation of bulk chemicals, can solve the problems of pollution, unfriendly reagents, mixed environment with impurities, etc., and achieve the effect of improving the sugar yield.

Active Publication Date: 2009-10-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above table that each of the above separation methods has its own advantages and disadvantages, but at least several environmentally unfriendly reagents will be introduced, which will make the pretreatment process mixed with impurities or cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take the whole corn stalk as raw material, take 5g and put it into the reaction kettle. The operating conditions are: temperature 50℃, pressure 10MPa, CO 2 The amount is 100 times the amount of raw materials, the amount of water is 50 times the amount of raw materials, and the reaction time is 5 hours. After pretreatment, the solid material saccharification analysis showed that the straw sugar yield was 58%, and the lignin removal rate was 30%.

[0042] This embodiment adopts figure 1 The process shown, using CO 2 The steps for pretreating corn stover with water as a supercritical or subcritical solvent are as follows:

[0043] (1) Weigh 5g of crushed and air-dried corn stalks and 250ml of distilled water, add them to the reactor 9, and turn on the reactor;

[0044] (2) Turn on CO 2 Feed pump 5, pump 500g of CO into the reactor2 ;

[0045] (3) After the air intake is completed, turn on the main power of the controller, the power of the display, and the power of the magneti...

Embodiment 2

[0048] Take the whole corn stalks as raw materials, take 5 g and put it into the reaction kettle, and 200 ml of butanol and aqueous solution, in which the butanol content is 33%. The operating conditions are: temperature 180℃, pressure 15MPa, CO 2 The amount is 40 times the amount of raw materials, and the reaction time is 1 hour. After pretreatment, the solid material saccharification analysis showed that the sugar yield rate of straw was 95%. The lignin removal rate is 90%.

[0049] This embodiment adopts figure 1 The process shown, using CO 2 The steps of pretreating corn stover with and butanol aqueous solution as a supercritical or subcritical solvent are as follows:

[0050] (1) Weigh 5g of crushed and air-dried corn stalks, 200ml of distilled water and butanol in a volume ratio of 2:1, add them to reactor 9, and turn on the reactor;

[0051] (2) Turn on CO 2 Feed pump 5, pump 200g CO into the reactor 2 ;

[0052] (3) After the air intake is completed, turn on the main powe...

Embodiment 3

[0055] Take whole corn stalks as raw materials, take 5 g and put it into the reaction kettle. The operating conditions are: temperature 250℃, pressure 20MPa, CO 2 The amount is 40 times the amount of raw materials, and the reaction time is 0.1 hour. After pretreatment, the solid material saccharification analysis showed that the straw sugar yield rate was 40%, and the lignin removal rate was 60%.

[0056] This embodiment adopts figure 1 The process shown, using CO 2 The steps for pretreating corn stover as a supercritical or subcritical solvent are as follows:

[0057] (1) Weigh 5g of crushed and air-dried corn stalks, add it to the reactor 9, and turn on the reactor;

[0058] (2) Turn on CO 2 Feed pump 5, pump 200g CO into the reactor 2 ;

[0059] (3) After the air intake is completed, turn on the main power of the controller, the power of the display, and the power of the magnetic stirrer in turn, adjust the speed of the stirrer to 300 rpm, and set the reaction temperature;

[...

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Abstract

The invention relates to a maize straw pretreatment method that is a new method for using supercritical or subcritical fluid technology to pretreat the maize straw. The new method improves the enzymolysis efficiency of cellulose in the maize straw, removes lignin that has inhibiting effect on the further fermentation process while improving the sugar yield of the straw, and provides an effective way for further cleanly and highly efficiently producing products such as fuel ethanol and the like. The method is characterized in that the pretreatment temperature is 50-250 DEG C; the operation pressure is 10-20MPa; the reaction time is 0.1-5h; and the solvent is the mixed solvent of CO2, water and one of or more of methanol, ethanol, butanol, pentanol and the like. The sugar yield of the cellulose in the maize straw is 40-95 percent.

Description

Technical field [0001] The invention relates to a corn stalk pretreatment method, which applies supercritical or subcritical fluid technology to a new method for pretreatment of corn stalks, and improves the enzymolysis efficiency of cellulose in the corn stalks. Background technique [0002] Corn stover is a large amount of agricultural waste, the main components are cellulose, hemicellulose, lignin and some soluble substances. Among them, cellulose is the main source of fermentable sugars, with a content of about 35%-45% (the absolute dry weight of cellulosic raw materials). The fermentable sugars can be further converted into ethanol, acetone, butanol, acetic acid, butane by microbial fermentation. Diols and other liquid fuels or chemical raw materials; can also be used as fermentation raw materials for antibiotics, organic acids, single cell protein (SCP), and enzyme preparations. When using cellulase to hydrolyze corn stover to produce glucose, the cellulase must be contacte...

Claims

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Application Information

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IPC IPC(8): C12P19/14C12P19/02
CPCY02P20/54
Inventor 吕惠生董秀芹李永辉张敏华
Owner TIANJIN UNIV
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