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Crop straw degradation pretreatment method

A technology for crop straw and pretreatment, applied in the field of waste resource utilization, can solve the problems of destroying straw lignin, affecting environmental safety, poor enzymatic hydrolysis effect, etc., and achieving the effects of improving the yield of reducing sugar and simple operation steps.

Active Publication Date: 2020-09-22
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • 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 crop straw degradation pretreatment method which comprises the following steps: in an ionic membrane electrolytic cell, dividing the ionic membrane electrolytic cell into a salt adding area, an anode area and a cathode area by adopting homogeneous anion and cation exchange membranes; adding a sodium chloride aqueous solution as an electrolyte into the salting area, and carrying out constant-current electrolysis to obtain acidic oxidized electrolyzed water in the anode area and alkaline reduced electrolyzed water in the cathode area; the method comprises the followingsteps: putting crop straws into alkaline reduction electrolytic water, heating and stirring for pretreatment; then putting into acidic oxidized electrolyzed water, heating, stirring and pre-treating;putting the pretreated crop straws into a buffer solution, and then adding an enzyme solution for enzymolysis; the acidic oxidized electrolyzed water is combined with the alkaline reduced electrolyzedwater to pretreat the straws, so that the removal effect of hemicellulose and lignin in the straws is effectively improved, the enzymolysis efficiency of subsequent steps is improved, and the methodis safe and environment-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 Applications(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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