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A process for degrading lignocellulose to produce hydrogen and produce ethanol

A technology for lignocellulose and ethanol production, which is applied in the direction of biomass post-treatment, biomass pretreatment, gas production bioreactor, etc., can solve the problems of high cost, limited development and application, low cellulose conversion rate, etc., and achieve Improve efficiency and effect, easy and fast operation, long service life

Active Publication Date: 2021-03-16
江苏省环境工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the most prominent problems are high cost, low cellulose conversion rate and low product yield and purity, which largely restrict its commercial application.
For example, the raw material utilization rate of thermochemical conversion technology is high, but its complex by-products are not conducive to the refining and purification of target products; in contrast, although biochemical conversion technology has high purity of target products and fewer types of by-products, etc. advantages, but its low conversion rate to lignocellulose also limits its development and application; therefore, the research on high-efficiency conversion of lignocellulose will help promote the large-scale application of biomass energy

Method used

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  • A process for degrading lignocellulose to produce hydrogen and produce ethanol
  • A process for degrading lignocellulose to produce hydrogen and produce ethanol
  • A process for degrading lignocellulose to produce hydrogen and produce ethanol

Examples

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Effect test

Embodiment 1

[0040] A process for degrading lignocellulose to produce hydrogen and produce ethanol, the process includes the following steps:

[0041] S1: Use toluene:ethanol=2:1 (v / v) as the extractant to dewax the cleaned and dried straw for 6 hours at 150°C, and finally wash the dewaxed straw with ethanol for 3 times, and dry it in cold air to obtain dewaxed straw. Waxed rice straw, use 12.5% ​​peracetic acid to treat dewaxed rice straw at 80°C for 2 hours to obtain solid a, and alkalinize the obtained solid a with sodium hydroxide, the concentration of sodium hydroxide aqueous solution is 15%, and the liquid-solid ratio is 20 : 1, the reaction temperature is 30°C, the reaction time is 1.5h, and solid b is obtained, and the solid b is cleaned with 40°C deionized water until the pH of the cleaning solution is neutral, and crushed to 16 mesh by a crusher. The solid after pretreatment is obtained; the exposed fiber bundles obtained by PAA-NaOH treatment are more than those obtained by othe...

Embodiment 2

[0046] This example is basically the same as Example 1, except that steps S3 and S3: the hydrolyzate is heated to 58°C at a rate of 2°C, and activated Clostridium thermocellum and nutrient solution are added to carry out anaerobic fermentation reaction. When the pressure in the fermenter exceeds 0.25MPa, the gas produced in the fermenter is collected to make the pressure in the fermenter reach 0.02MPa, and the hydrogen and ethanol produced by the anaerobic fermentation reaction are respectively subjected to the enrichment and separation of the produced gas and the separation of the produced liquid. Separate and obtain hydrogen and ethanol; the anaerobic fermentation reaction is specifically: 1) adjust the pH of the liquid in the tank to 7.2 after 3 days of fermentation reaction, discharge and collect 1 / 2 of the supernatant in the fermentation tank after 4 days of fermentation reaction, and press Proportionally add activated Clostridium thermocellum, nutrient solution and hydrol...

Embodiment 3

[0048] This example is basically the same as Example 1, except that steps S3 and S3: the hydrolyzate is heated to 58°C at a rate of 2°C, and activated Clostridium thermocellum and nutrient solution are added to carry out anaerobic fermentation reaction. When the pressure in the fermenter exceeds 0.35MPa, the gas produced in the fermenter is collected to make the pressure in the fermenter reach 0.02MPa, and the hydrogen and ethanol produced by the anaerobic fermentation reaction are respectively subjected to the enrichment and separation of the produced gas and the separation of the produced liquid. Separate and obtain hydrogen and ethanol; the anaerobic fermentation reaction is specifically: 1) adjust the pH of the liquid in the tank to 7.2 after 3 days of fermentation reaction, discharge and collect 2 / 3 of the supernatant in the fermentation tank after 6 days of fermentation reaction, and press Proportionally add activated Clostridium thermocellum, nutrient solution and hydrol...

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Abstract

The invention discloses a process for degrading lignocellulose to produce hydrogen and ethanol. The process comprises the following steps: S1, dewaxing cleaned and dried straws, treating the dewaxed straws with peracetic acid to obtain a solid a, alkalizing the obtained solid a with sodium hydroxide to obtain a solid b, washing the treated solid b with deionized water to obtain a pretreated solid;S2, treating the pretreated solid in a hydrolysis reactor to obtain a hydrolysate; and S3, heating the hydrolysate, adding activated clostridium thermocellum, and carrying out a fermentation reactionto obtain ethanol and hydrogen products. The straws treated by the process disclosed by the invention are completely degraded, and the yield of the prepared hydrogen and ethanol is obviously improved.

Description

technical field [0001] The invention relates to the technical field of biomass energy, in particular to a process for degrading lignocellulose to produce hydrogen and produce ethanol. Background technique [0002] With the increasing energy consumption, the reserves of fossil fuels, which account for about 85% of the total energy consumption, are gradually depleted; moreover, the combustion process of fossil fuels such as oil, natural gas and coal will release a large amount of greenhouse gases, causing secondary pollution, etc. question. Therefore, the search for clean renewable energy and the development of renewable energy utilization technology have become urgent problems to be solved in today's society. [0003] As one of the main biomass energy, lignocellulosic biomass, such as crop straw, weeds, forestry waste, etc., can be converted into hydrogen, methane, bioethanol, butanol, and biodiesel through physicochemical or biochemical techniques and other high value-adde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12P5/00C12M1/36C12M1/02C12M1/00
CPCC12M21/04C12M21/12C12M23/02C12M27/02C12P5/00C12P7/10C12P2201/00C12P2203/00Y02E50/10
Inventor 柴丽娜孙兆海叶懿安李盈语张小强陈思
Owner 江苏省环境工程技术有限公司
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