CN110468162B - Production process and device for preparing fuel ethanol by one-time phase transition method - Google Patents

Production process and device for preparing fuel ethanol by one-time phase transition method Download PDF

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CN110468162B
CN110468162B CN201910684615.3A CN201910684615A CN110468162B CN 110468162 B CN110468162 B CN 110468162B CN 201910684615 A CN201910684615 A CN 201910684615A CN 110468162 B CN110468162 B CN 110468162B
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ethanol
permeable membrane
steam
membrane
permeation
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CN110468162A (en
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李十中
李洪深
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Tsinghua University
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/12—Bioreactors or fermenters specially adapted for specific uses for producing fuels or solvents
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/16—Solid state fermenters, e.g. for koji production
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
    • C12M27/10—Rotating vessel
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M33/00—Means for introduction, transport, positioning, extraction, harvesting, peeling or sampling of biological material in or from the apparatus
    • C12M33/16—Screw conveyor
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M43/00—Combinations of bioreactors or fermenters with other apparatus
    • C12M43/02—Bioreactors or fermenters combined with devices for liquid fuel extraction; Biorefineries
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
    • C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
    • C12P7/06—Ethanol, i.e. non-beverage
    • C12P7/08—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Abstract

The invention relates to a production process for preparing fuel ethanol by a one-time phase transition method, which comprises the following steps: (1) solid state fermentation; (2) a solid state distillation step; (3) and (4) a vapor permeation step. The production process can greatly reduce the production cost of the fuel ethanol from the aspects of saving energy, reducing pollutant emission, saving equipment investment and the like, and is a green, energy-saving and sustainable biomass fuel ethanol production technology.

Description

Production process and device for preparing fuel ethanol by one-time phase transition method
Technical Field
The invention belongs to the technical field of biological new energy and high-efficiency energy conservation, and particularly relates to a process technology for preparing fuel ethanol by taking sugar crops as raw materials and integrating solid fermentation, solid distillation and steam permeation technologies, wherein only one-time phase change is needed in the whole process.
Background
Under the background of global warming and increasingly tense world energy supply, clean and low-carbon development becomes a global energy pattern, and the biofuel ethanol becomes an ideal substitute of fossil fuel due to the comprehensive advantages of being renewable, environment-friendly, mature in technology, convenient to use, easy to popularize and the like.
At present, the production process of fuel ethanol in China mainly adopts liquid fermentation and is matched with the traditional double-tower rectification technology, and a rectification tower is a plate tower or a packed tower. Generally, ethanol after liquid fermentation is firstly introduced into a flash tank, crude ethanol after flash evaporation is heated to about 45 ℃ and enters a pre-rectifying tower, and the crude ethanol is heated to a certain temperature to be partially gasified by utilizing the difference of the boiling points of water and ethanol, and is concentrated layer by layer. The pre-rectifying tower generally rectifies the solution to about 50wt%, and the solution enters a main rectifying tower to further remove heavy fraction with low boiling point. After the ethanol is rectified to 95.5wt% azeotropic point, the ethanol is extracted from the top of the tower or a measuring line, cooled to normal temperature by a condenser, and further dehydrated to absolute ethyl alcohol. The common dehydration method comprises a pressure swing molecular sieve adsorption method, an azeotropic distillation method, an extractive distillation method and the like, which have a plurality of defects, and the whole production process is complex, low in production efficiency, high in energy consumption and high in equipment investment, so that the final product cost is high.
In the aspect of solid state fermentation, the invention patent CN102071222A provides a drum type continuous solid state fermentation device, which changes the traditional intermittent production mode of solid state fermentation and realizes the automatic continuous production of the solid state fermentation process. The invention patent CN102094045A aims at the defect that the solid material has no fluidity, and adopts the structure of the distribution grid plate and the rotary grid to realize the continuous operation of the distillation and alcohol extraction process in the solid fermentation material. The above patent of the invention is the preorder section of the invention and provides a technological premise for the invention, but the actual production of the fuel ethanol by the solid-state fermentation method still needs to adopt methods such as rectification, pressure swing adsorption and the like to prepare the fuel ethanol.
According to statistics, in the fuel ethanol production process, the energy consumption of the rectification and dehydration links accounts for more than 45% of the energy consumption of the whole production process, mainly because of the reflux requirement of the rectification process, vaporized ethanol needs to be cooled and refluxed, the discharged material at the top of the tower is vaporized and enters the next section of rectification tower, and the tower still needs a reboiler to provide rising steam to maintain gas-liquid contact. The process of multiple repeated phase changes requires a large amount of energy and consumes a large amount of cooling water. Therefore, finding a unit operation with high separation efficiency and low energy consumption to replace the rectification operation becomes the key for realizing the energy-saving goal in the whole fuel ethanol production. Meanwhile, a large amount of BOD wastewater is generated in the liquid fermentation juicing waste liquid and the rectified tower bottom liquid, the wastewater treatment is difficult and the investment is huge. And dense membrane separation techniques, typified by vapor permeation, are an ideal alternative to rectification.
Vapor Permeation (VP for short) is a novel membrane technology for separating a mixture by feeding Vapor and utilizing the difference in the dissolution and diffusion properties of each component in a dense membrane under the promotion of the partial pressure difference of the Vapor of each component in the mixture, has the advantages of gas separation and pervaporation, has the advantages of simple equipment, good selectivity, high single-stage separation degree, large mass transfer rate, no pollution, easy operation, easy amplification and the like, and has wide application prospects and markets in the industrial fields of petrochemical industry, medicine, food, environmental protection and the like.
The invention patent CN108083979A proposes a method for dehydrating ethanol water vapor azeotrope at the top or side of a rectifying tower by using a vapor permeable water permeable membrane, taking liquid fermentation and rectification as a preorder process. The invention patent CN1450166A uses a pervaporation method to reduce the feedback inhibition effect of ethanol on the fermentation process in the liquid fermentation process, and uses a vacuum pump and a pervaporation membrane to pump out gaseous ethanol in the fermentation process and prepares anhydrous ethanol through vapor permeation dehydration. Although the above patents utilize the membrane separation method to a certain extent to improve the efficiency of the ethanol dehydration or fermentation process, the main process flow still mainly adopts rectification operation, because the operation object of liquid fermentation itself is the sugar crop after juicing, the sugar is fermented into ethanol in the liquid state, if the steam permeation technology is adopted, the phase of the liquid alcohol-water mixture needs to be changed into steam again, which is actually equivalent to part of the rectification process, therefore, the steam permeation technology has little space for utilizing in the fuel ethanol production process based on the liquid fermentation. The solid fermentation and distillation need steam to strip the ethanol in the fermentation material, the steam after the steam stripping is gaseous, the whole process can be kept in the gaseous state all the time by adopting a steam permeation method, and the method is also the basis of the technology for separating the ethanol by a one-time phase change method.
Disclosure of Invention
Technical problem to be solved by the invention
The invention aims to combine the solid fermentation, solid distillation and steam permeation technologies into a complete fuel ethanol production process, fully utilize the advantage of extracting ethanol from solid fermentation materials by a steam stripping method and the characteristic that the steam permeation technology can realize component separation without phase change, and achieve the aims of reducing production energy consumption, reducing separation cost and avoiding environmental pollution.
Means for solving the technical problem
Aiming at the problems, the invention provides a production process and a device for preparing fuel ethanol by a one-time phase transition method.
According to one embodiment of the invention, the production process for preparing fuel ethanol by the one-time phase transition method is characterized by comprising the following steps: (1) solid state fermentation; (2) a solid state distillation step; (3) and (4) a vapor permeation step.
In one embodiment, the solid-state fermentation step comprises pulverizing sugar crops, and adding yeast for fermentation.
In one embodiment, the solid-state distillation step comprises contacting 0.2-0.7 MPa of steam with ethanol in the fermentation material, and stripping mixed steam containing 15-24 wt% of ethanol.
In one embodiment, the steam permeation step comprises two steam permeation processes of separating and purifying through the alcohol permeable membrane component and the inorganic water permeable membrane component.
One embodiment is that the mixed steam directly enters the alcohol permeable membrane assembly without condensation, one side of the membrane adopts a vacuumizing mode to generate driving force, so that the ethanol steam permeates the membrane assembly, and the vacuum degree is kept at 50-200 Pa in the separation process.
One embodiment is that the steam permeation step comprises pressurizing ethanol subjected to steam permeation by an alcohol permeable membrane to 0.2-0.4 MPa, and performing dehydration operation in an inorganic water permeable membrane separator.
In one embodiment, the membrane permeation side is subjected to simultaneous action of cooling and vacuumizing by a cooler, the vacuum degree is kept at 150-500 Pa, water vapor contained in mixed vapor is removed, and the non-permeation component is cooled to obtain the fuel ethanol.
In one embodiment, the membrane module and the water-permeable membrane module are in the form of tubular, flat or hollow fiber membranes.
In one embodiment, the alcohol permeable membrane comprises an active layer selective for ethanol; the permeable membrane is an inorganic NaA type molecular sieve membrane or an MFI type molecular sieve membrane.
According to an embodiment of the present invention, there is provided a production apparatus for producing fuel ethanol by a one-time phase transition method, including the following units: (1) a solid state fermentation unit; (2) a solid state distillation unit; (3) a vapor permeation unit.
The invention has the advantages of
(1) Continuous solid state fermentation, solid state distillation and steam permeation technology are combined, so that the process from steam stripping of ethanol from fermentation products to final finished products is always kept in a gaseous state, the primary phase change heat loss and cooling water consumption in the intermediate process can be reduced by more than 50% compared with the traditional process.
(2) Greatly simplifies the process flow, is convenient to operate, and is easy to realize industrial application in an enlarged way.
(3) The whole process does not generate high-concentration juicing wastewater and waste liquid of a distillation tower kettle, is green, environment-friendly and pollution-free, and saves sewage treatment cost and treatment facility investment.
(4) The discharged material of the solid distillation tower can be used as feed, the alcohol permeable membrane separation steam can be used as secondary steam to heat the material of the solid distillation tower, the water permeable inorganic membrane can be recycled as engineering softened water through water, the environment-friendly process is realized, and the three wastes are not discharged in the whole process.
(5) The membrane component is adopted to replace the rectification process, so that the investment and the occupied area of production devices such as a rectification tower, a pressure swing adsorption tower and the like are saved.
In conclusion, the method can greatly reduce the production cost of the fuel ethanol from the aspects of saving energy, reducing pollutant emission, saving equipment investment and the like, and is a green, energy-saving and sustainable biomass fuel ethanol production technology.
Further features of the present invention will become apparent from the following description of exemplary embodiments.
Drawings
FIG. 1 is a process flow diagram of a production scheme for producing fuel ethanol by a one-time phase transition process.
Reference numbers in the figures:
1-rotary solid fermentation tank; 2-feeding auger; 3-a steam generating device; 4-steam regulating valve; 5-motor and transmission; 6-a solid state distillation column; 7-a discharging auger; 8-a permselective membrane module; 9-mechanical recompression fan; 10-vacuum pump 1; 11-a steam reheater; 12-an inorganic permeable membrane module; 13-a plate heat exchanger; 14-vacuum pump 2; 15-a shell and tube heat exchanger; 16-product receiving tank.
Detailed Description
One embodiment of the present disclosure will be specifically described below, but the present disclosure is not limited thereto.
The application provides a production process for preparing fuel ethanol by a one-time phase transition method, which is based on solid state fermentation and solid state distillation, sugar crops are placed in a rotary drum type fermentation tank, ethanol in the fermentation material is stripped through a continuous solid state distillation tower to obtain ethanol and water mixed steam, the mixed steam is separated and purified through two steam permeation processes of an alcohol permeation membrane component and an inorganic water permeation membrane component, finally, the fuel ethanol with the concentration of more than 99.5wt% is obtained through cooling, and the steam which does not permeate through the alcohol permeation membrane is heated and used as a secondary heat source for preheating after being compressed mechanically. The whole process is characterized by the continuity and automation of production, no phase change exists in the whole process from the extraction of mixed steam from the solid fermentation material to the concentration to the final product, and no high-concentration wastewater and distilled waste liquid are generated.
The ethanol concentration of the fermented material after solid fermentation is 4-8 wt%, the steam stripping pressure is 0.2-0.7 MPa, the ethanol concentration of ethanol-water mixed steam after solid distillation is 15-24 wt%, the ethanol concentration after permeation of the ethanol permeable membrane component is increased to 75-90 wt%, and the ethanol concentration after dehydration of the inorganic water permeable membrane component is more than 99.5 wt%.
The alcohol permeable membrane component and the water permeable membrane component are in the form of a tube, a flat plate or a hollow fiber membrane. The alcohol permeable membrane component adopts 2-8 groups according to the purification requirement and the difference of the active layer material to the selectivity of ethanol, and the inorganic water permeable membrane component adopts 1-5 groups according to the difference of the concentration of ethanol permeated by the alcohol permeable membrane in the previous sequence.
The alcohol permeable membrane should contain an active layer selective for ethanol. The active layer material with selectivity to ethanol adopts polydimethylsiloxane, polytrimethylsilylpropyne, polyvinyldimethylsilane, polytrimethylsilane, polyethylene and polypropylene as organic materials or adopts an organic-inorganic hybrid MFI type molecular sieve membrane. An active layer organic material having selectivity to ethanol, characterized in that the thickness of the active layer is 10 to 100 μm.
The permeable membrane is an inorganic NaA type molecular sieve membrane or an MFI type molecular sieve membrane.
The mass transfer driving force in the steam permeation process is pressure difference, the vacuum degree of the permeation side of the alcohol permeable membrane is kept at 50-200 Pa, and the vacuum degree of the permeation side of the inorganic water permeable membrane is kept at 150-500 Pa.
The steam which does not permeate the alcohol permeable membrane can be reused as a secondary heat source after being mechanically recompressed to meet the pressure requirement, and no high-concentration production waste liquid is generated in the whole process.
Specifically, the production process for preparing the fuel ethanol by the one-time phase transition method comprises the following specific steps:
(1) crushing sugar crops, adding the crushed sugar crops into a rotary solid-state fermentation tank, adding yeast liquid, fermenting for a certain time, and adding a fermentation product containing 4-8 wt% of ethanol into the top of a solid-state distillation tower through a spiral feeding device.
(2) And introducing 0.2-0.7 MPa of water vapor from the bottom of the solid distillation tower, heating the solid fermentation material on the tower tray, driving the rotating grid by the motor to enable the fermentation material to rotate in the tower, enabling the fermentation material to enter the lower-layer tower tray after being in countercurrent contact with the steam, and discharging the fermentation material from a discharge opening.
(3) Steam is contacted with ethanol in the fermentation material, mixed steam containing 15-24 wt% of ethanol is stripped, the mixed steam directly enters the ethanol permeable membrane assembly without condensation, a vacuumizing mode is adopted on one side of the membrane to generate driving force, the ethanol steam permeates the membrane assembly, and the vacuum degree is kept at 50-200 Pa in the separation process. And improving the quality of the steam by the mechanical steam recompression fan, and introducing the steam which does not permeate into the bottom of the solid distillation tower to be used as a secondary heat source. And when the secondary heat source is stable, the steam inlet valve is properly closed, so that the energy consumption of primary steam is reduced.
(4) The concentration of ethanol after vapor permeation through the alcohol permeable membrane is 75-90 wt%, the ethanol is pressurized to 0.2-0.4 MPa by a steam blower, the ethanol enters an inorganic water permeable membrane separator for dehydration, the permeation side of the membrane is cooled by a cooler and pumped by a vacuum pump simultaneously to generate a mass transfer driving force, the vacuum degree is kept at 150-500 Pa, water vapor contained in mixed vapor is removed, the components which do not permeate are cooled to obtain fuel ethanol with the concentration of more than 99.5wt%, and the permeated water vapor can be recycled after being cooled.
In the invention, the concentration of the ethanol generated in the solid fermentation material is determined by various factors such as the types of sugar crops, fermentation strains, reaction temperature and the like. The ethanol concentration in the vapor after solid state distillation is determined by the ethanol concentration in the fermentation material. The concentration of the ethanol purified by the vapor permeation of the alcohol permeable membrane is determined by the materials of the active part which has selectivity to the ethanol in the alcohol permeable membrane, the thickness of the membrane, the number and the form of the membrane components and the like.
As shown in figure 1, sugar crops are crushed and then added into a rotary solid-state fermentation tank 1 together with yeast, after continuous fermentation, a fermentation product is distributed to the top of a solid-state distillation tower 6 by using a feeding auger 2, steam generated by a steam generating device 3 enters the tower from the bottom of the solid-state distillation tower 6, a grid in the tower is driven by a motor and a transmission device 5 to rotate, so that the fermentation material is continuously in countercurrent contact with the steam, stripped ethanol-water mixed steam flows out from the top of the tower, and the steamed material is discharged by a device 7 and then processed to be used as feed. The steam at the top of the tower directly enters the alcohol permeable membrane component 8 for purification, and the pressure difference is generated at the two sides of the alcohol permeable membrane under the action of the vacuum pump 10, so that the steam permeation process is promoted. The non-permeated steam enters a steam reheater to reheat the extracted ethanol steam after being pressurized by a mechanical recompression fan 9, the steam phase state is maintained, and the non-permeated steam after heat exchange can be introduced into a jacket of a feeding auger 2 to be recycled as a secondary heat source. The steam permeates through the alcohol permeable membrane to be thickened, and after being heated by a steam reheater, the steam is introduced into the inorganic water permeable membrane component 12 for further dehydration. The permeated water is cooled by the plate heat exchanger 13 and then recycled. The ethanol steam with the concentration of more than or equal to 99.5wt% is extracted by a vacuum pump 14, and enters a product receiving tank 16 after being cooled by a tubular heat exchanger 15, so as to obtain the final fuel ethanol product.
Examples
Adding the crushed sweet sorghum and proper yeast into a solid-state fermentation tank, fermenting for 20 hours, conveying to the top of a solid-state distillation tower, introducing 0.4MPa steam into the distillation tower, discharging after the fermented material stays in the distillation tower for 20 minutes, and further processing the vinasse into feed. And (3) introducing mixed steam containing 18wt% of ethanol into an alcohol permeable membrane component to perform a steam permeation process, purifying to 75wt%, and introducing into an inorganic water permeable membrane component to dehydrate to obtain the finished product fuel ethanol.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (6)

1. A production process for preparing fuel ethanol by a one-time phase transition method is characterized by comprising the following steps:
(1) a continuous solid state fermentation step;
(2) a continuous solid state distillation step;
(3) a step of vapor permeation of the alcohol-permeable and water-permeable membrane;
wherein, the continuous solid-state fermentation step comprises the steps of crushing sugar crops, and directly adding saccharomycetes for solid-state fermentation; wherein the continuous solid-state distillation step comprises the steps of contacting 0.2-0.7 MPa of water vapor with ethanol in the fermentation material, and stripping mixed vapor containing 15-24 wt% of ethanol; wherein, the steam permeation step comprises two times of steam permeation processes of separating and purifying through the alcohol permeable membrane component and the inorganic water permeable membrane component.
2. The process of claim 1, wherein the mixed vapor is introduced directly into the alcohol permeable membrane assembly without condensation, and a vacuum is applied to one side of the membrane to generate a driving force to cause the ethanol vapor to permeate the membrane and maintain the vapor state.
3. The production process according to claim 1, wherein the steam permeation step comprises pressurizing the ethanol subjected to the steam permeation through the alcohol permeable membrane to 0.2-0.4 MPa, and performing dehydration operation in an inorganic water permeable membrane separator.
4. The production process according to claim 1, wherein the membrane permeation side is cooled by a cooler and vacuumized at the same time, the vacuum degree is kept at 150-500 Pa, water vapor contained in the mixed vapor is removed, and the non-permeation component is cooled to obtain the fuel ethanol.
5. The production process according to claim 1, wherein the alcohol-permeable membrane module and the water-permeable membrane module are in the form of a tube, a flat plate or a hollow fiber membrane.
6. The production process according to claim 5, wherein the alcohol permeable membrane comprises an active layer selective for ethanol; the permeable membrane is an inorganic NaA type molecular sieve membrane.
CN201910684615.3A 2019-07-26 2019-07-26 Production process and device for preparing fuel ethanol by one-time phase transition method Active CN110468162B (en)

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CN1186450C (en) * 2003-05-13 2005-01-26 南京工业大学 Method for preparing absolute ethanol by biological substance fermentation and inembrane permeation vaporization
CN101033476A (en) * 2007-01-08 2007-09-12 清华大学 Method and system for preparing ethanol based on sweet broomcorn straw solid fermentation
US8535413B2 (en) * 2009-12-28 2013-09-17 Chevron U.S.A. Inc. Integrated mechanical vapor recompression (MVR) and membrane vapor permeation process for ethanol recovery (ethanol dehydration) from fermentation broth
CN102070400A (en) * 2010-11-18 2011-05-25 清华大学 Membrane separation method of solid state fermentation ethanol

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