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Method and system for preparing ethanol through efficient gas fermentation

A technology for producing ethanol and gas, applied in the field of high-efficiency gas fermentation to produce ethanol, can solve the problems of low water consumption per unit of ethanol concentration, etc., and achieve the effects of reducing water consumption and stable control

Pending Publication Date: 2022-05-06
河北首朗新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present application provides a method and system for ethanol production by efficient gas fermentation to solve the technical problem that the existing fermentation ethanol production method cannot meet the requirements of stable control of ethanol concentration and low water consumption per unit of ethanol

Method used

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  • Method and system for preparing ethanol through efficient gas fermentation
  • Method and system for preparing ethanol through efficient gas fermentation
  • Method and system for preparing ethanol through efficient gas fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The nutrient solution flow rate of the nutrient solution inlet of the fermentation device is 5m 3 / h, the raw gas intake at the raw gas inlet is 500Nm 3 / h, the volume of the fermentation device is 100m 3 , The concentration of ethanol in the mash is 30g / L, and the concentration of bacteria is 20g / L. The mash outlet flow rate of the fermentation unit is 20m 3 / h, the mash enters the centrifugal cell separation device, after concentration and separation, the concentration of the clear phase of the mash is 1g / L, and the flow rate is 16m 3 / h; the dense phase concentration of bacteria is 100g / L, and the flow rate is 4m 3 / h, of which 2m 3 The thick phase of the bacteria in / h is discharged from the system, and the remaining dense phase of the bacteria is recycled to the fermentation device to continue fermentation. The clear phase of the mash enters the crude distillation ethanol separation device to obtain 150g / L ethanol with a flow rate of 3m 3 / h, obtain the clear...

Embodiment 2

[0067] The nutrient solution flow rate of the nutrient solution inlet of the fermentation device is 8m 3 / h, the raw gas intake at the raw gas inlet is 500Nm 3 / h, the volume of the fermentation device is 100m 3 , The concentration of ethanol in the mash is 30g / L, and the concentration of bacteria is 20g / L. The mash outlet flow rate of the fermentation unit is 30m 3 / h, the mash enters the centrifugal cell separation device, after concentration and separation, the concentration of the clear phase of the mash is 1g / L, and the flow rate is 26m 3 / h; the dense phase concentration of bacteria is 100g / L, and the flow rate is 4m 3 / h, of which 2m 3 The thick phase of the bacteria in / h is discharged from the system, and the remaining dense phase of the bacteria is recycled to the fermentation device to continue fermentation. The clear phase of the mash enters the alcohol-permeable membrane separation device to obtain 75g / L ethanol with a flow rate of 6m 3 / h, obtain the dealco...

Embodiment 3

[0069] The nutrient solution flow rate of the nutrient solution inlet of the fermentation device is 10.6m 3 / h, the raw gas intake at the raw gas inlet is 500Nm 3 / h, the volume of the fermentation device is 100m 3 , The concentration of ethanol in the mash is 30g / L, and the concentration of bacteria is 20g / L. The mash outlet flow rate of the fermentation unit is 300m 3 / h, the mash enters the bacterial membrane separation device, after concentration and separation, the concentration of the clear phase of the mash is 0g / L, and the flow rate is 30m 3 / h; the dense phase concentration of bacteria is 22.2g / L, and the flow rate is 270m 3 / h, of which 9m 3 The thick phase of the bacteria in / h is discharged from the system, and the remaining dense phase of the bacteria is recycled to the fermentation device to continue fermentation. The clear phase of the mash enters the crude distillation ethanol separation device to obtain 150g / L ethanol with a flow rate of 1.6m 3 / h, and a...

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Abstract

The invention particularly relates to a method and system for preparing ethanol through efficient gas fermentation, and belongs to the field of biological fermention.The method comprises the steps that industrial tail gas is fermented, and mash is obtained; carrying out solid-liquid separation on the mash to obtain a mash clear phase and a thallus concentrated phase; and performing liquid-liquid separation on the mash clear phase to obtain a dealcoholized clear phase and an ethanol concentrated phase, and recycling the dealcoholized clear phase for fermentation. A dealcoholization clear phase is separated from mash obtained by fermenting industrial tail gas, and the dealcoholization clear phase is reused in the fermentation process. When the concentration of ethanol in the mash is too high, the liquid outlet amount of the dealcoholization clear phase can be increased by increasing the liquid outlet amount of the mash, and then the dealcoholization clear phase is returned to the mash, so that the concentration of ethanol in the mash can be reduced. Through the arrangement, the ethanol can be continuously extracted from the mash in the process of preparing the ethanol by fermentation, the concentration of the ethanol is further stably controlled, and meanwhile, most of water is recycled for fermentation along with the dealcoholization clear phase, so that the water consumption of unit ethanol is greatly reduced.

Description

technical field [0001] The present application relates to the field of biological fermentation, in particular to a method and system for producing ethanol by efficient gas fermentation. Background technique [0002] At present, the process of producing alcohol by fermentation using industrial gas containing CO as raw material has been successfully industrialized, and its environmental protection and economic benefits have been widely recognized. The Clostridium used in industrial gas fermentation to produce ethanol has low tolerance to high concentrations of ethanol. In order to ensure the normal growth and reproduction of Clostridium, it is necessary to maintain a stable concentration of ethanol in the mash. In the prior art, single-stage fermentation or two-stage fermentation are usually used to maintain the concentration of ethanol in the mash. The ethanol concentration of single-stage fermentation is low, but the water consumption per unit of ethanol is high; and low pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/08C12M1/00C12R1/145
CPCC12P7/08C12M21/12C12M29/04C12M43/02C12M47/02
Inventor 莫志朋陈琪佟淑环张春悦息晓杰宋庆坤
Owner 河北首朗新能源科技有限公司
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