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Method for producing medium-chain fatty acid through anaerobic fermentation of lignocellulosic material

A technology for lignocellulosic raw materials and medium-chain fatty acids, which is applied in the field of waste recycling, can solve the problems of low energy density of small molecular acids, limited resource utilization, difficult separation and purification, etc., achieves high added value, reduces difficulty and cost, and increases Effect of acid production rate

Inactive Publication Date: 2020-07-10
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these small molecular acids have low energy density, strong hydrophilicity, and difficult separation and purification, which limits the subsequent resource utilization.

Method used

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  • Method for producing medium-chain fatty acid through anaerobic fermentation of lignocellulosic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 As shown, the method for preparing hexanoic acid by anaerobic fermentation of corn stalks comprises the following steps:

[0026] (1) Crush the corn stalks to less than 2cm, mix them with anaerobic digested sludge at a mass ratio of 1:20, use sodium hydroxide to adjust the pH to 11.0 to obtain a raw material solution, and add 20mmol of Add 2-bromoethylsulfonate sodium in a large amount, and then enter the anaerobic reactor for anaerobic fermentation. The fermentation temperature is 35°C, and the fermentation is continued for 15 days to obtain a fermentation broth with a short-chain fatty acid concentration of 6-8g / L. is about 5.5;

[0027] (2) Keep the fermented liquid obtained in step (1) for anaerobic fermentation for 20 days, control the fermentation temperature at 30°C, add ethanol in an amount of 1 g per 100 g of fermented liquid on the second day of fermentation, and obtain it after 15 to 20 days Fermentation broth rich in caproic acid, the concent...

Embodiment 2

[0030] like figure 1 Shown, the method for preparing hexanoic acid and octanoic acid by hybrid pennisetum anaerobic fermentation comprises the following steps:

[0031] (1) Crush fresh Pennisetum hybrida to less than 1cm, mix it with anaerobic digested sludge at a mass ratio of 1:10, adjust the pH to 10.0 with sodium hydroxide to obtain a raw material solution, and add 50mmol / L sodium 2-bromoethylsulfonate was added, followed by anaerobic fermentation at a fermentation temperature of 55°C for 10 days to obtain a fermentation broth with a short-chain fatty acid concentration of 10-12g / L;

[0032] (2) Continue anaerobic fermentation of the fermentation broth obtained in step (1), the fermentation temperature is 40°C, and ethanol is added every 2 days from the second day of fermentation, and the amount of ethanol is added per 100g of fermentation broth 0.5g of ethanol was added to the fermentation broth, and after 40 to 45 days, a fermentation broth rich in caproic acid and capr...

Embodiment 3

[0035] like figure 1 Shown, the method for preparing caproic acid by anaerobic fermentation of silage corn stalks comprises the following steps:

[0036] (1) Crush the silage corn stalks to less than 2 cm, mix them with anaerobic digested sludge at a mass ratio of 1:4, adjust the pH to 9.0 with potassium hydroxide to obtain a raw material solution, and add 50 mmol of per liter of raw material solution to the raw material solution Add sodium 2-bromoethylsulfonate in a large amount, then carry out anaerobic fermentation at a fermentation temperature of 30°C, and continue fermentation for 5 days to obtain a fermentation broth with a short-chain fatty acid concentration of 8-10 g / L;

[0037] (2) Continue anaerobic fermentation of the fermented liquid obtained in step (1), the fermentation temperature is 30°C, add lactic acid in the amount of 3 g of lactic acid per 100 g of fermented liquid on the second day of fermentation, and ferment for 10 to 15 days Obtain a fermented liquid ...

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Abstract

The invention provides a method for producing a medium-chain fatty acid through anaerobic fermentation of a lignocellulosic material. The method for producing the medium-chain fatty acid through anaerobic fermentation of the lignocellulosic material comprises the following steps: (1) mixing the crushed lignocellulosic material and anaerobic digestion sludge according to a mass ratio ranging from 1:4 to 1:20, adjusting a pH value to be 9.0-11.0, adding a methanogenic inhibitor, and then conducting anaerobic fermentation to obtain first fermentation liquor containing a short-chain fatty acid; (2) continuing conducting anaerobic fermentation on the first fermentation liquor containing the short-chain fatty acid for 10-45 days at a fermentation temperature of 30-40 DEG C, and intermittently adding ethyl alcohol or lactic acid in the fermentation process to obtain second fermentation liquor containing the medium-chain fatty acid; and (3) conducting solid-liquid separation on the second fermentation liquor containing the medium-chain fatty acid to obtain supernate, adjusting a pH value of the supernate to be 3.0-6.0, and extracting the medium-chain fatty acid from the supernate. The method for producing the medium-chain fatty acid through anaerobic fermentation of the lignocellulosic material can not only consume the organic waste (lignocellulosic material), but also has a clean conversion process compared with a petrochemical-based technology, and thus is a clean green conversion technology.

Description

Technical field: [0001] The invention relates to the technical field of waste recycling, in particular to a method for preparing medium-chain fatty acids by anaerobic fermentation of lignocellulosic raw materials. Background technique: [0002] Lignocellulosic raw materials are the most abundant and sustainable hydrocarbon biomass resources. They mainly include agricultural and forestry wastes such as straws and new biomass such as energy herbs. They have the characteristics of wide sources, large output, and stable composition. , has the potential of hierarchical utilization, and is a good raw material for the anaerobic conversion of biomass to prepare biogas or platform compounds. With the continuous development of biomass energy, more and more attention has been paid to the conversion of lignocellulosic raw materials such as straw and energy plants to produce energy or bio-based products. Alleviating the pressure on the ecological environment and improving the energy str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/64
CPCC12P7/6409C12P2201/00C12P2203/00
Inventor 邢涛甄峰孙永明孔晓英李连华杨改秀李颖
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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