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Flash evaporation ferment method of synchronous gas stripping for producing ethanol

A fermentation method and ethanol technology, applied in fermentation, biofuels, etc., can solve problems such as difficulty in finding high selectivity, low ethanol removal efficiency, membrane fouling, and low flux, to eliminate substrate inhibition and enhance ethanol in The effect of bit extraction ability and improvement of fermentation intensity

Inactive Publication Date: 2007-06-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still difficulties in the application of the above method in industry.
During the extraction fermentation process, it is difficult to find a highly selective and bacteria-friendly extractant
In the membrane separation fermentation method, it is difficult to solve the problems of membrane fouling and low flux
Air stripping fermentation is simple and has the prospect of easy industrialization, but the removal efficiency of ethanol is low, which is restricted by the performance of air compressor
Vacuum fermentation research is relatively early, and the removal efficiency of ethanol is high, but it is difficult to maintain fermentation under vacuum, and the energy consumption is also high

Method used

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  • Flash evaporation ferment method of synchronous gas stripping for producing ethanol

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Embodiment 1

[0011] As shown in Figure 1, add the saccharified mash into the fermenter with side arms, the glucose content is 250g / L, and the yeast is connected to start the fermentation, the inoculum is 4g / L, the temperature is maintained at 32℃, and a small amount of CO is introduced. 2 , The aeration volume is 0.01m per liter of fermentation broth 3 / h. After 18 hours of fermentation, the ethanol concentration reached 60g / L, open the valve between the fermentation tank and the flash tank, increase the ventilation, and start the simultaneous stripping flash operation. CO 2 The aeration volume is 0.1m per liter of fermented mash 3 / h, the pressure of the flash tank is maintained at 38mmHg, and the flow rate into the flash tank is 10ml / min per liter of fermentation mash. Through CO 2 The ethanol and water taken out are recovered by the condenser, and the concentration is above 40% (mass concentration). The fermented mash enters the flash tank from the fermenter, the vapor phase obtained by fla...

Embodiment 2

[0013] The conditions for the start of fermentation are the same as in Example 1. When the simultaneous stripping and flashing operation is started, the feed valve is opened and the feed is started to realize continuous fermentation, as shown in FIG. 1. The feeding rate is 24ml / h per liter of mash, and the feeding glucose concentration is 500g / L. High-concentration feed can save water. During the continuous fermentation process, the concentration of ethanol was maintained at 55g / L, the concentration of glucose was maintained at 80g / L, and the cell concentration was maintained at 10g / L. The fermentation intensity can reach 5.5g -1 h -1 , Which is 3 times of normal fermentation under the same fermentation conditions.

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Abstract

A process for preparing alcohol by synchronous gas extracting, flash vaporizing and fermenting for shortening the period features that the inertial gas is introduced to the fermentor from its bottom for gas-extracting the mixed gas contening alcohol and the mixed gas is condensed in the condenser to obtain alcohol while the fermented substance comes in the flash evaporator via side channel for vacuum flash evaporizing to separate alcohol from water.

Description

Technical field [0001] The invention relates to a synchronous gas stripping flash fermentation method for producing ethanol, and belongs to a fermentation method for producing ethanol. Background technique [0002] Ethanol, commonly known as alcohol, is an important organic chemical raw material and solvent. Especially in recent years, as the energy crisis has intensified, the production of ethanol by fermentation of biomass raw materials has attracted more and more attention due to its advantages of renewable and clean combustion. [0003] At present, the production of biomass raw material ethanol generally adopts batch fermentation process. Because the increase of ethanol concentration in the fermentation process will have a feedback inhibition effect on the fermentation process, the production capacity is low and the water consumption is large. For this reason, processes such as vacuum fermentation, membrane separation fermentation, air-lift fermentation, and extractive fermen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/06
CPCY02E50/17Y02E50/10
Inventor 曾爱武袁希钢余国琮刘振
Owner TIANJIN UNIV
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