A method for pretreatment of crop straw degradation

A crop straw and pretreatment technology, which is applied in the field of waste resource utilization, can solve the problems of affecting environmental safety, destroying straw lignin, and poor enzymatic hydrolysis effect, and achieves the effect of simple operation steps and improved reducing sugar yield

Active Publication Date: 2022-04-29
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dilute acid pretreatment cannot effectively destroy the lignin in the straw. In addition, the traditionally used dilute acid solutions are sulfuric acid, hydrochloric acid, etc., which have serious pollution problems after pretreatment and affect environmental safety. It is necessary to use more environmentally friendly solutions. pretreatment solution
[0003] In addition, ozone, sodium hypochlorite and other oxidants are used to oxidize and pretreat crop straw. The oxidant can effectively separate lignin and dissolve hemicellulose during the degradation process, but the enzymatic hydrolysis effect after pretreatment is not good.
[0004] In summary, the enzymatic hydrolysis effect of the current crop straw degradation pretreatment method is not ideal, and there is no suitable pretreatment method. Therefore, it is necessary to provide a better method for crop straw degradation pretreatment

Method used

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Embodiment 1

[0038] In the ion-exchange membrane electrolyzer, a homogeneous anion-exchange membrane and a homogeneous cation-exchange membrane are used to divide the ion-exchange membrane electrolyzer into three parts: the cathode area, the salt addition area and the anode area according to the volume ratio of 5:1:5. The anode uses titanium-based platinum Iridium oxide alloy electrode, the cathode uses a titanium plate electrode, the distance between the cathode plate and the anode plate is 4cm, and the effective area of ​​the electrode is 1dm 2 . Add 100mL NaCl solution with a concentration of 5g / L in the middle salt adding area as electrolyte, and add 500mL deionized water in the anode area and cathode area respectively. During electrolysis, at a current density of 4A dm -2After electrolysis for 60 minutes, acidic oxidized electrolyzed water is obtained in the anode area, and alkaline reduced electrolyzed water is obtained in the cathode area. After testing, the pH value of the acidic...

Embodiment 2

[0040] In the ion-exchange membrane electrolyzer, a homogeneous anion-exchange membrane and a homogeneous cation-exchange membrane are used to divide the ion-exchange membrane electrolyzer into three parts: the cathode area, the salt addition area and the anode area according to the volume ratio of 5:1:5. The anode uses titanium-based platinum Iridium oxide alloy electrode, the cathode uses a titanium plate electrode, the distance between the cathode plate and the anode plate is 4cm, and the effective area of ​​the electrode is 1dm 2 . Add 100mL NaCl solution with a concentration of 5g / L in the middle salt adding area as electrolyte, and add 500mL deionized water in the anode area and cathode area respectively. During electrolysis, at a current density of 4A·dm -2 After electrolysis for 60 minutes, acidic oxidized electrolyzed water is obtained in the anode area, and alkaline reduced electrolyzed water is obtained in the cathode area. After testing, the pH value of the acidi...

Embodiment 3

[0042] In the ion-exchange membrane electrolyzer, a homogeneous anion-exchange membrane and a homogeneous cation-exchange membrane are used to divide the ion-exchange membrane electrolyzer into three parts: the cathode area, the salt addition area and the anode area according to the volume ratio of 5:1:5. The anode uses titanium-based platinum Iridium oxide alloy electrode, the cathode uses a titanium plate electrode, the distance between the cathode plate and the anode plate is 4cm, and the effective area of ​​the electrode is 1dm 2 . Add 100mL NaCl solution with a concentration of 4g / L in the middle salt adding area as electrolyte, and add 500mL deionized water in the anode area and cathode area respectively. During electrolysis, at a current density of 3A dm -2 After electrolysis for 60 minutes, acidic oxidized electrolyzed water is obtained in the anode area, and alkaline reduced electrolyzed water is obtained in the cathode area. After testing, the pH value of the acidi...

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Abstract

The invention discloses a method for degrading and pretreating crop stalks. The method comprises the following steps: in the ion membrane electrolyzer, the ion membrane electrolyzer is divided into a salt adding area, an anode area and a cathode area by using a homogeneous anion and cation exchange membrane Three parts: adding sodium chloride aqueous solution as electrolyte in the salt adding area, constant current electrolysis, the anode area obtains acidic oxidized electrolyzed water, and the cathode area obtains alkaline reduced electrolyzed water; put the crop straw into alkaline reduced The electrolyzed water is heated and stirred for pretreatment; then put into the acidic oxidized electrolyzed water, heated and stirred for pretreatment; the above-mentioned pretreated crop straws are put into the buffer solution, and then enzyme solution is added for enzymatic hydrolysis. The pretreatment of straw by using acidic oxidized electrolyzed water combined with alkaline reduced electrolyzed water can effectively improve the removal effect of hemicellulose and lignin in straw, improve the enzymatic hydrolysis efficiency of subsequent steps, and is safe and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of waste resource utilization, and more specifically relates to a method for pretreating straw by using acidic oxidized electrolyzed water combined with alkaline reduced electrolyzed water. Background technique [0002] The main organic components of crop straw are cellulose, hemicellulose, and lignin, and the total content of the three reaches more than 70%. Degrading the cellulose in crop straws and converting them into liquid fuels and chemical raw materials is one of the ideal ways to efficiently utilize straws. However, cellulose itself contains a large number of hydroxyl groups, and there are a large number of hydrogen bonds between molecules, resulting in a dense crystal structure and difficult to degrade. In addition, the three components in the crop straw are interlaced, so that the cellulose degrading enzymes cannot contact the cellulose, thereby affecting the degradation effect of cellulose. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12P19/14
CPCC12P7/10C12P19/14C12P2201/00Y02E50/10
Inventor 朱玉婵任占冬
Owner WUHAN POLYTECHNIC UNIVERSITY
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