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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 high cost, high energy consumption, and low utilization rate of raw materials, and achieve production cost reduction and recovery efficiency High, the effect of increasing the CO2 entrainment rate

Inactive Publication Date: 2004-09-01
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

[0012] 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 1

[0042] Embodiment 1. corn raw material saccharification filtrate fed-batch fermentation alcohol

[0043] 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 tower 6 with an inlet and outlet, and an alcohol product collector 8 The condenser 7. The height-diameter ratio of the tank body of the air-lift alcohol fermentation reactor 2 is 8, and an internal circulation guide tube 3 with a height-diameter ratio of 7 is placed concentrically in the tank body of the air-lift alcohol fermentation reactor 2, and a gas distribution pipe 4 is placed at the bottom , the ratio of the diameter of the reactor 2 tank body to the internal circulation guide tube 3 is 0.6; the diameter ratio of the gas distribution pipe diameter to the reactor 2 tank body is 0.5, and the opening ratio of the small holes o...

Embodiment 2

[0048] Embodiment 2. corn thick mash batch fermentation alcohol

[0049] The equipment of Example 1 was utilized.

[0050] 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 sterilize the corn medium for 20 minutes, then cool the corn medium to 40°C, add 5% yeast seed liquid relative to the weight of the medium, and ferment at 35°C for 10-14 hours , when the alcohol concentration in the fermented liquid reaches 3wt%, open the water ring vacuum pump 5, and the water vapor and CO at the top of the air-lift alcohol bioreactor 2 The mixed gas with alcohol is pumped out to keep the vacuum at the top of the airlift bioreactor at 5000-8000Pa. The extracted mixed gas enters one of the two activated carbon adsorption towers 6 connected in parallel. When the alcohol sensor alarms, th...

Embodiment 3

[0052] Example 3. Fed-batch fermentation of alcohol with straw raw material hydrolyzate.

[0053] Equipment is with embodiment 1.

[0054] 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 culture medium to 40°C, ferment at 35°C for 10--12 hours, when the alcohol concentration in the fermented liquid reaches 3wt%, turn on the water ring vacuum pump 5, and remove the water vapor and CO from the top of the air-lift alcohol bioreactor. 2 The mixed gas with alcohol is pumped out to keep the vacuum at the top of the airlift bioreactor at 7000-8000Pa. The extracted mixed gas enters one of the two activated carbon adsorption towers 6 connected in parallel. When the alcohol sensor alarms, the activated carbon adsorption tower with saturated adsorption is switched to ano...

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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 produc...

Claims

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Application Information

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Patent Type & Authority Patents(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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