Method and system for producing ethanol through fermentation of industrial tail gas

A technology of industrial tail gas and fermentation method, which is applied in the direction of fermentation, biochemical equipment and methods, bioreactor/fermentation tank combination, etc. It can solve the problems of low ethanol concentration, high COD and BOD content, and cannot be directly discharged, so as to achieve purification Emissions, effects of improving purity and yield

Active Publication Date: 2017-08-29
BEIJING SHOUGANG LANZATECH TECH CO LTD
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AI Technical Summary

Problems solved by technology

However, the ethanol production process of industrial tail gas fermentation also has problems such as low ethanol concentration in the fermentation liquid, bacterial protein denaturation by heat, easy to block the distillation tray, and high COD and BOD content in the sewage; moreover, the fermentation tail gas still contains a small amount of CO, which cannot be discharged directly into the air

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  • Method and system for producing ethanol through fermentation of industrial tail gas
  • Method and system for producing ethanol through fermentation of industrial tail gas

Examples

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Effect test

Embodiment 1

[0057] Such as figure 1 As shown, the system for producing ethanol by industrial tail gas fermentation method in Example 1 of the present invention includes a gas pretreatment device 1, a fermentation device 2, a distillation device 3, a dehydration device 4, a cell protein separation device 5, a drying device 6, and a sewage treatment device 7. Tail gas treatment device 8; the method for preparing ethanol by using the above-mentioned system as raw material with industrial tail gas comprises the following steps:

[0058] The raw material industrial tail gas is pressurized by a compressor in the gas pretreatment system, and then purified industrial tail gas 14 is obtained after desulfurization, deoxidation, and cooling, and sent to the fermentation device 2 . In the fermentation device 2, the bacteria continuously proliferate with industrial tail gas as raw material, and produce ethanol and other chemicals through metabolism. The mature mash 17 with an ethanol concentration of...

Embodiment 2

[0065] Such as figure 2 As shown, the system for preparing ethanol from industrial tail gas in Example 2 of the present invention includes a gas pretreatment device 1, a fermentation device 2, a distillation device 3, a dehydration device 4, a cell protein separation device 5, a drying device 6, and a sewage treatment device 7. Tail gas treatment device 8, compressed natural gas CNG device 9 and BDO separation device 29; the method for preparing ethanol by using the above-mentioned system with industrial tail gas as raw material includes the following steps:

[0066] The raw material industrial tail gas is pressurized by a compressor in the gas pretreatment device 1, and then desulfurized, deoxidized, and cooled to obtain a purified industrial tail gas 14, which is sent to the fermentation device 2. In the fermentation device 2, the bacteria continuously proliferate with industrial tail gas as raw material, and produce ethanol and other chemicals through metabolism. The ferm...

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PUM

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Abstract

A main propose of the invention is to provide a method and a system for producing ethanol through fermentation of industrial tail gas. The method includes the steps of: 1) pre-treating the industrial tail gas by removing toxic substances in the industrial tail gas to obtain purified tail gas; 2) fermenting the purified tail gas to obtain fermented mature mash and residual gas; 3) distilling the fermented mature mash to prepare ethanol and bacterium-containing residual water; 4) separating and concentrating the bacterium-containing residual water to obtain a concentrated liquid and a clear liquid; 5) purifying the clear liquid; and 6) performing tail gas treatment to the residual gas to remove residual CO. The method achieves optimization and organic combination of processes in the whole system and is high in yield and purity in the produced ethanol, effectively purifies discharged wastewater and tail gas, effectively utilizes the raw materials and achieves circulation utilization of substances and energy of the whole system.

Description

technical field [0001] The invention belongs to the technical field of tail gas recovery, and in particular relates to a method and system for producing ethanol by fermentation of industrial tail gas. Background technique [0002] The traditional fuel ethanol production process mostly uses corn, wheat, cassava, etc. as raw materials, and produces ethanol through yeast fermentation. At present, many fuel ethanol enterprises in China have adopted this production process, but this process uses grain and crops as raw materials. The cost is high; at the same time, as a country with a large population and a small area of ​​cultivated land per capita, China uses a large number of grain crops as raw materials to produce ethanol, which has food security problems, and it is difficult to solve the development problem of "not competing with others for food and land". Gas fermentation using industrial tail gas as raw material uses CO as a carbon source and uses bacterial fermentation to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/06C12P7/18C12M1/00C12M1/04
CPCC12M21/02C12M29/06C12M29/18C12M43/02C12M47/14C12M47/18C12P7/06C12P7/18Y02E50/10
Inventor 莫志朋王晓东晁伟陈超夏楠张春悦佟淑环
Owner BEIJING SHOUGANG LANZATECH TECH CO LTD
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