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Method for promoting production of ethanol from poplar through hydrothermal and NaOH aqueous solution pretreatment

A pretreatment and aqueous solution technology, which is 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: 2021-07-16
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.), as Mohammad Saber Bay etc. disclose a kind of method that poplar is carried out pretreatment with alkali, 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 hydrothermal combination NaOH aqueous solution pretreatment method that promotes poplar to produce ethanol

[0039] 1. Experimental method

[0040] S1. The first stage of pretreatment: crush the air-dried poplar wood to 20-60 mesh, and then take 15g of it and place it in a closed reactor equipped with a thermocouple, and react with 150mL water at 200°C for 20 minutes and immediately Use condensed water to reduce the reaction to room temperature, centrifuge to obtain the filtrate and filter residue, dry the filter residue, and set aside;

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

[0042] S3. Saccharification and fermentation: take the pretreatment residue and 95mL nutrie...

Embodiment 2

[0045] Embodiment 2 A kind of hydrothermal combination NaOH aqueous solution pretreatment method that promotes poplar to produce ethanol

[0046] 1. Experimental method

[0047] S1. The first stage of pretreatment: crush the air-dried poplar wood to 20-60 mesh, and then take 15g of it and place it in a closed reactor equipped with a thermocouple, and react with 120mL water at 200°C for 5 minutes and immediately Use condensed water to reduce the reaction to room temperature, centrifuge to obtain the filtrate and filter residue, dry the filter residue, and set aside;

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

[0049] S3. Saccharification and fermentation: take the pretreatment residue and 90mL nutri...

Embodiment 3

[0052] Embodiment 3 A kind of hydrothermal combination NaOH aqueous solution pretreatment method that promotes poplar to produce ethanol

[0053] 1. Experimental method

[0054] S1. The first stage of pretreatment: crush the air-dried poplar wood to 20-60 mesh, and then take 15g of it and place it in a closed reactor equipped with a thermocouple, and react with 225mL water at 180°C for 20 minutes and immediately Use condensed water to reduce the reaction to room temperature, centrifuge to obtain the filtrate and filter residue, dry the filter residue, and set aside;

[0055] S2. The second stage of pretreatment: the filter residue described in step S1 is mixed with 225mL of 1.0% (w / v) NaOH aqueous solution, and after reacting at 120°C for 60min, the reaction is immediately lowered to room temperature with condensed water, and vacuum filtration is carried out to obtain pretreatment residue;

[0056] S3. Saccharification and fermentation: take the pretreatment residue and 100m...

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Abstract

The invention provides a method for promoting production of ethanol from poplar through hydrothermal and NaOH aqueous solution pretreatment. The method comprises the following steps: crushing poplar, reacting with water at 180-200 DEG C for 5-30 minutes, mixing filter residues obtained by separation with a NaOH aqueous solution, reacting at 80-120 DEG C for 30-120 minutes, separating to obtain pretreated residues, adding cellulase, a saccharomycetes activating solution and a nutrient solution, and carrying out diastatic fermentation. According to the method, a hydrothermal and NaOH aqueous solution two-section pretreatment combined mode is adopted, the influence of lignin on the enzymolysis and fermentation process is reduced, on the premise that the alkali concentration is reduced, production of ethyl alcohol from poplar can be effectively promoted, and the ethyl alcohol yield reaches up to 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 wood to produce ethanol through hydrothermal pretreatment 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 bottlenecks are immature pretreatment technology and low cellulase activity, resulting in high production costs. 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 enzyme and substrate can be increased, thereby improving the efficiency of enzymatic hydrolysis and saving time and money. The purpose of reducing costs. The pretreatment method to effec...

Claims

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Application Information

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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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