Alcohol preparing airlift fermentation and separation coupling technological process and special equipment

An air-lift fermentation and air-lift technology, which is applied in the field of ethanol preparation using air-lift fermentation separation coupling technology, can solve the problems of unsatisfactory industrial production, low raw material utilization rate, and low entrainment efficiency, and achieve the elimination of susceptible bacteria problems, CO2 entrainment rate increase, production cost reduction effect

Inactive Publication Date: 2003-03-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is CO 2 The problem of low entrainment efficiency cannot meet the requirements of industrial production
[0011] Alcohol concentration in the reactor distilled concentration Productivity (g / l.h) features batch fermentation 5-16％ 5-16％ 2.4-5.0 High energy consumption and high cost traditional continuous fermentation 3.0-5.5％ 3.0-5.5％ 4.1-11 High energy consumption and high cost , low utilization rate of raw materials vacuum fermentation less than 1% 16-20％ 82 High energy consumption CO 2 accumulate susceptible to miscellaneous bacteria extractive fermentation 1.42％ 10-17％ 1.39 Low energy consumption, simple operation Extractant / Mash =5-43 / 1 poisonous Membrane cycle hair leaven 2.0-7.5％ 17-40％ 48-130 High membrane resistance, high efficiency Low, easy to clog, membrane high cost CO 2 air stripping fermentation 5.5％ 32-53％ 1.0-5.0 Low energy consumption, CO 2 Entrainment efficiency is low (one volume per minute Fermented mash needs 5- 20CO 2 volume)

Method used

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  • Alcohol preparing airlift fermentation and separation coupling technological process and special equipment
  • Alcohol preparing airlift fermentation and separation coupling technological process and special equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0041] CO from the adsorption tower 2 The gas is sprayed into the bioreactor from the gas distribution pipe 4 at the bottom of the airlift bioreactor, so that the fermentation broth is lifted in the inner circulation sleeve 3, and the fermentation broth forms an internal circulation in the reactor 2, and is entrained in the fermentation broth of alcohol. CO 2 The gas circulation rate is 1-2vvm (CO per minute cycle 2 gas volume to fermentation broth volume ratio). Regularly add sugar solution from the sterile liquid storage cylinder 1 to keep the glucose concentration in the fermentation broth at 6-10%. Embodiment 2. corn thick mash batch fermentation alcohol

[0042] The equipment of Example 1 was utilized.

[0043] Carry out steaming, liquefaction and saccharification of corn grain raw materials (solid content is about 15%), filter and remove slag, and directly load into an air-lift bioreactor until the volume of the reactor is 60%; Raise the temperature to 120°C to ste...

Embodiment 3

[0044] CO from the adsorption tower 2 The gas is sprayed into the bioreactor from the gas distribution pipe 4 at the bottom of the airlift bioreactor, so that the fermentation broth is lifted in the inner circulation sleeve 3, and the fermentation broth forms an internal circulation in the reactor 2, and is entrained in the fermentation broth of alcohol. CO 2 The gas circulation rate is 2-3vvm (CO per minute cycle 2 gas volume to fermentation broth volume ratio). Batch fermentation ends when the glucose concentration in the broth drops to a low level or zero. Example 3. Fed-batch fermentation of alcohol with straw raw material hydrolyzate.

[0045] Equipment is with embodiment 1.

[0046] Put the glucose solution of the straw raw material through acid hydrolysis or enzyme hydrolysis into the air-lift bioreactor until it fills 70% of the reactor volume; raise the temperature to 120°C to sterilize the straw medium for 20 minutes, and then Cool the stalk medium to 40°C, fer...

Embodiment 4

[0047] CO from the adsorption tower 2 The gas is sprayed into the bioreactor from the gas distribution pipe 4 at the bottom of the airlift bioreactor, so that the fermentation broth is lifted in the inner circulation sleeve 3, and the fermentation broth forms an internal circulation in the reactor 2, and is entrained in the fermentation broth of alcohol. CO 2 The gas circulation rate is 2-3vvm (CO per minute cycle 2 gas volume to fermentation broth volume ratio). The hydrolyzed sugar solution is regularly added from the aseptic liquid storage cylinder 1 to keep the glucose concentration in the fermentation broth at 8-10%. Example 4. Synchronous saccharification and fermentation of straw raw materials to separate alcohol

[0048] Please refer to the attached figure 1 . The air-lift fermentation separation coupling equipment includes an air-lift alcohol fermentation reactor 2 with a sterile liquid storage tank 1, a water ring vacuum pump 5, an activated carbon adsorption t...

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Abstract

The present invention belongs to the technology of fermenting alcohol production, and is especially alcohol preparing airlift fermentation and separation coupling technological process and special equipment. The equipment is one airlift alcohol fermenting reactor, which includes one tank, one inner circulating guide tube concentrically set inside the tank, one gas distributor below the guide tube, and one active carbon adsorbing and desorbing unit comprising condensator and two parallelly connected adsorbing active carbon towers. The airlift alcohol bioreactor is maintained in a 4000-8000 Pa vacuum with a water ring pump; the two parallelly connected adsorbing active carbon towers are used to adsorb and desorb the pumped mixed gas alternately; and the condensator is used to collect the desorbed alcohol.

Description

technical field [0001] The invention belongs to the technical field of alcohol production by fermentation, and in particular relates to a method and special equipment for preparing alcohol by adopting an air-lift fermentation separation coupling technology. Background technique [0002] Fuel alcohol is a kind of high-efficiency, clean and environmentally friendly fuel that can supplement or replace gasoline. It uses corn and straw as raw materials to ferment alcohol, which has important economic benefits for the utilization of renewable resources, solving the shortage of petroleum resources, and controlling air pollution. social and strategic significance. [0003] Alcohol is an important industrial raw material. The total energy consumption of producing 1 ton of alcohol (including distiller's grains to produce protein feed) in developed countries is 600-700 kg of standard coal; domestically, it is 700-900 kg of standard coal (not including the producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/00C12P7/08
CPCC12M21/12C12M29/08
Inventor 陈洪章李佐虎
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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