Method for separating acetone-butanol-alcohol fermenting liquid by utilizing pervaporation-rectification coupling

A technology of pervaporation and acetone butanol, which is applied in the field of preparation of anhydrous acetone, butanol and ethanol, can solve the problems of low concentration of the first-stage pervaporation concentrated solution, increase equipment cost, and high energy consumption of operation, and achieve strong production capacity, Effects of reduced concentration cost and low energy consumption

Active Publication Date: 2014-05-07
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in CN201210265526.3, an extraction tower is added behind the first-level alcohol-preferential permeation membrane to realize the separation of the permeate, which increases the equipment cost
However, in the invention of CN201210228150.9, the first-level organic phase and the second-level organic phase are directly subjected to water-permeable membrane treatment and dehydration treatment, which will cause an increase in energy consumption, because the concentration of the first-level organic phase feed liquid and the second-level organic phase feed liquid is ideally the highest The value is 80wt%, generally 50wt% ~ 70wt%, at this t

Method used

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  • Method for separating acetone-butanol-alcohol fermenting liquid by utilizing pervaporation-rectification coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018]Biomass is fermented with acetone and butanol at 30°C. When the concentration of acetone, butanol and ethanol produced in the fermenter (1) reaches 1.6wt%, start the first infusion pump (2) to send the fermentation broth into the first stage In the membrane module (3), the alcohol-preferential membrane (polydimethylsiloxane / silica zeolite / polyacrylonitrile composite membrane) is used, at a temperature of 30°C, a flow rate of 0.5m / s, and a vacuum degree on the downstream side of Separation is carried out under the condition of 200Pa, and the retentate with reduced concentration is circulated to the fermenter (1) to continue fermentation. The permeate is condensed at the outlet of the first vacuum pump (4) and then sent to the liquid separation tank (5) for two-phase separation. The second infusion pump (6) is used to separate the water phase with a concentration of 21.2wt% and the concentration of 65.7wt% The % organic phase is sent into the aqueous phase storage tank (7)...

Embodiment 2

[0020] Biomass is fermented with acetone and butanol at 40°C. When the concentration of acetone, butanol and ethanol produced in the fermenter (1) reaches 0.8wt%, start the first infusion pump (2) to send the fermentation broth into the first stage In the membrane module (3), a preferential alcohol permeable membrane (polydimethylsiloxane / alumina composite membrane, alumina pore size 200nm) is used, at a temperature of 40°C, a flow rate of 2.5m / s, and a vacuum degree on the downstream side of Separation is carried out under the condition of 10000Pa, and the retentate with reduced concentration is circulated to the fermenter (1) to continue fermentation. The permeate is condensed at the outlet of the first vacuum pump (4) and sent to the liquid separation tank (5) for two-phase separation. The second infusion pump (6) is used to separate the water phase with a concentration of 27.3wt% and the concentration of 58.7wt% The % organic phase is sent into the aqueous phase storage ta...

Embodiment 3

[0022] Biomass is fermented with acetone and butanol at 40°C. When the concentration of acetone, butanol and ethanol produced in the fermenter (1) reaches 0.5wt%, start the first infusion pump (2) to send the fermentation broth into the first stage In the membrane module (3), the alcohol-preferential membrane (polydimethylsiloxane / SiO 2 hybrid membrane), the separation is carried out at a temperature of 40°C, a flow rate of 1.0m / s, and a downstream space of 500Pa, and the retentate with reduced concentration is circulated to the fermenter (1) to continue fermentation. The permeated liquid is condensed at the outlet of the first vacuum pump (4) and sent to the liquid separator tank (5), if the two-phase separation does not occur. Then, the concentration of the mixture in the liquid separation tank (5) is 18wt%, and the second infusion pump (6) is used to send the mixture into the water phase storage tank (7), and then the mixture is sent to the secondary membrane by the third i...

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Abstract

The invention discloses a method for separating an acetone-butanol-alcohol fermenting liquid by utilizing pervaporation-rectification coupling. The method comprises the following steps: coupling acetone, butanol and alcohol for fermentation by pervaporation alcohol-permeating films, and utilizing pervaporation alcohol-permeating films to increase the concentrations of the acetone, the butanol and the alcohol in the fermentation liquid so as to realize separation of acetone/butanol/alcohol water solution and form a high-concentration organic phase and a low-concentration water phase. The organic phase is treated by directly utilizing multi-stage rectifying operation to obtain an acetone product, a butanol product and an alcohol product with the concentrations being more than 99wt%. The water phase is treated by carrying out separation through a secondary pervaporation alcohol-permeating film and a primary pervaporation alcohol-permeating film and carrying out multi-stage rectifying operation so as to obtain the acetone product, the butanol product and the alcohol product with the concentrations being more than 99wt% finally. The method disclosed by the invention has the advantages that the inhibiting action of the butanol in the fermentation process can be reduced, and the productivity can be improved; and the high-concentration organic phase is obtained by utilizing phase separation of a permeating liquid and carrying out primary pervaporation; and simultaneously, the azeotrope formed by butanol and water is avoided, the energy consumption for production and separation is saved, and the production cost in the fermentation process of the acetone and the butanol is greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing anhydrous acetone, butanol and ethanol by using biomass as a raw material through fermentation, pervaporation and rectification; in particular, it relates to a method for separating acetone butanol and ethanol fermentation liquid by using pervaporation-rectification coupling method. Background technique [0002] As an important chemical raw material, butanol is widely used in food and chemical industry. And butanol is considered to be a biofuel more suitable for replacing petroleum than ethanol because of its high energy density, miscibility with other fuels, high octane number, low volatility, and suitability for internal combustion engines. [0003] At present, the process of producing bio-butanol from biomass such as agricultural products or cellulose mostly adopts batch fermentation process. This is because in the process of bio-butanol fermentation, the fat-soluble product butanol has a serious pro...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C31/12C07C29/74C07C29/80C07C49/08C07C45/78C07C45/82C12P7/06C12P7/16C12P7/28
CPCC07C29/74C07C29/80C07C45/786C07C45/82C07C31/08C07C31/12C07C49/08Y02E50/10
Inventor 周浩力苏仪万印华
Owner NANJING UNIV OF TECH
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