A kind of method for promoting poplar ethanol production by pretreatment of hydrothermal combined naoh aqueous solution

A pretreatment and aqueous solution technology, applied in the field of ethanol preparation, can solve the problems of serious equipment corrosion, achieve the effects of improving accessibility, improving enzymatic conversion rate, and promoting the production of ethanol

Active Publication Date: 2022-07-08
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The commonly used pretreatment techniques include acid treatment, alkali treatment, acid-catalyzed organic solvent treatment, oxidation treatment, etc. (Zhang Zhen, Zang Zhongsheng, Liu Ping, Chang Xiulian, Wen Shaohong. Research progress on lignocellulose pretreatment methods[J] .Hubei Agricultural Sciences, 2012,51(07):1306-1309.), disclose a kind of method that poplar is carried out pretreatment with alkali as Mohammad Saber Bay etc., but the sodium hydroxide concentration that this pretreatment method uses is relatively High (mass concentration is 8%), more serious to equipment corrosion, and final yield is only about 43% (Mohammad Saber Bay, Keikhosro Karimi, Mohsen NasrEsfahany, Rajeev Kumar.Structural modification of pine and poplar wood byalkali prevention to improve ethanol production [J]. Industrial Crops & Products, 2020, 152.)

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 A kind of method of promoting poplar ethanol production by hydrothermal combination NaOH aqueous solution pretreatment

[0039] 1. Experimental method

[0040] S1. The first stage of pretreatment: pulverize the air-dried poplar to 20-60 mesh, then take 15 g of it and place it in a closed reactor equipped with a thermocouple, and immediately react with 150 mL of water at 200 ° C for 20 minutes in a closed manner. The reaction is lowered to room temperature with condensed water, centrifuged to obtain filtrate and filter residue, and the filter residue is dried for subsequent use;

[0041] S2. Second stage pretreatment: mix the filter residue described in step S1 with 150 mL of 1.0% (w / v) NaOH aqueous solution, react at 120° C. for 60 min and immediately reduce the reaction to room temperature with condensed water, and carry out vacuum filtration to obtain pretreatment residue;

[0042] S3. Saccharification and fermentation: take the pretreatment residue des...

Embodiment 2

[0045] Embodiment 2 A kind of method of promoting poplar ethanol production by hydrothermal combination NaOH aqueous solution pretreatment

[0046] 1. Experimental method

[0047] S1. The first stage of pretreatment: pulverize the air-dried poplar to 20-60 mesh, and then take 15 g of it and place it in a closed reactor equipped with a thermocouple, and immediately react with 120 mL of water at 200 ° C for 5 minutes. The reaction is lowered to room temperature with condensed water, centrifuged to obtain filtrate and filter residue, and the filter residue is dried and used for subsequent use;

[0048] S2. The second stage of pretreatment: mixing the filter residue described in step S1 with 120 mL of 1.5% (w / v) NaOH aqueous solution, reacting at 80° C. for 120 min and immediately reducing the reaction to room temperature with condensed water, and performing vacuum filtration to obtain pretreatment residue;

[0049] S3. Saccharification and fermentation: take the pretreatment resi...

Embodiment 3

[0052] Embodiment 3 A kind of method of promoting poplar ethanol production by hydrothermal combination NaOH aqueous solution pretreatment

[0053] 1. Experimental method

[0054] S1. The first stage of pretreatment: pulverize the air-dried poplar to 20-60 mesh, and then take 15 g of it and place it in a closed reactor equipped with a thermocouple, and immediately react with 225 mL of water at 180 ° C for 20 min. The reaction is lowered to room temperature with condensed water, centrifuged to obtain filtrate and filter residue, and the filter residue is dried and used for subsequent use;

[0055] S2. Second stage pretreatment: mix the filter residue described in step S1 with 225mL of 1.0% (w / v) NaOH aqueous solution, react at 120° C. for 60 min and immediately reduce the reaction to room temperature with condensed water, carry out vacuum filtration to obtain pretreatment residue;

[0056] S3. Saccharification and fermentation: take the pretreatment residue and 100 mL of nutr...

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Abstract

The invention provides a method for promoting poplar ethanol production by pretreatment of hydrothermal combined with NaOH aqueous solution. In the present invention, the poplar is first crushed, reacted with water at 180-200 DEG C for 5-30 minutes, the separated filter residue is mixed with NaOH aqueous solution, reacted at 80-120 DEG C for 30-120 minutes, and the pretreatment residue is obtained by separation, Then add cellulase, yeast activation solution and nutrient solution for saccharification and fermentation. The method adopts the combination of two stages of pretreatment of hydrothermal and NaOH aqueous solution to reduce the influence of lignin on the enzymatic hydrolysis and fermentation process, and under the premise of reducing the alkali concentration, it can also effectively promote the production of ethanol from poplar, and the ethanol yield is as high as 50.91%.

Description

technical field [0001] The invention belongs to the technical field of ethanol preparation. More specifically, it relates to a method for promoting poplar ethanol production by pretreatment of hydrothermal combined with NaOH aqueous solution. Background technique [0002] The conversion and utilization of lignocellulose can be divided into three stages: raw material pretreatment, enzymatic hydrolysis and sugar fermentation. The main technical bottleneck is that the pretreatment technology is not mature enough and the activity of cellulase is low, resulting in high production cost. Through the pretreatment of raw materials, the crystalline structure of cellulose can be destroyed, the degree of polymerization of lignin can be reduced, the porosity of lignocellulosic materials can be improved, and the contact area between enzymes and substrates can be increased, thereby improving the efficiency of enzymatic hydrolysis and saving time and energy. the purpose of reducing costs. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12P19/14C12R1/865
CPCC12P7/10C12P19/14C12P2201/00Y02E50/10
Inventor 谢君樊美杉张红丹
Owner SOUTH CHINA AGRI UNIV
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