CN112808036A - Gas dehumidification film and preparation method and application thereof - Google Patents
Gas dehumidification film and preparation method and application thereof Download PDFInfo
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- CN112808036A CN112808036A CN202011607068.8A CN202011607068A CN112808036A CN 112808036 A CN112808036 A CN 112808036A CN 202011607068 A CN202011607068 A CN 202011607068A CN 112808036 A CN112808036 A CN 112808036A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
- B01D71/80—Block polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/268—Drying gases or vapours by diffusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
Abstract
The invention provides a gas dehumidification membrane and a preparation method and application thereof, wherein the preparation raw materials of the gas dehumidification membrane comprise polyether-b-polyamide and hydrophilic electrolyte, and the mass ratio of the polyether-b-polyamide to the hydrophilic electrolyte is 3: 7-9: 1. The polyether-b-polyamide is a block copolymer, and the hydrophilic electrolyte comprises an organic electrolyte sodium salt and/or a hydrophilic inorganic salt. The gas dehumidification membrane prepared by compounding the hydrophilic electrolyte and the polyether-b-polyamide has the advantages of high permeability, good gas selectivity, good stability, preferential water vapor permeation, higher separation performance on water vapor, mild operation conditions, easy repetition and contribution to industrialization, and can be applied to dehumidification of gases such as air, nitrogen, hydrogen, natural gas, synthetic gas or pyrolysis gas.
Description
Technical Field
The invention belongs to the technical field of gas separation membranes, and relates to a gas dehumidification membrane and a preparation method and application thereof.
Background
Air humidity is one of important environmental parameters closely related to life and production of people, and how to control humidity has very important significance for improving living conditions, developing production technology, guaranteeing production technology and improving product quality. The currently common air dehumidification methods include cooling dehumidification, solid adsorbent dehumidification and rotating wheel dehumidification. Although the traditional dehumidification methods are widely applied, the defects of low dehumidification efficiency, complex equipment, secondary pollution and the like still exist.
The membrane method gas dehumidification is a promising and attractive high and new technology, and has the unique advantages of small occupied area, flexible operation, low cost, low energy consumption, no pollution and the like. In the method, a gas dehumidification membrane is the core, and the design and development of a high-performance membrane material is the key of a membrane dehumidification technology. Most of the separation membranes applied at present are high molecular polymer membranes, mainly comprising cellulose derivatives, polyaluminium, polyamides, polyimides, polyesters, polyolefins, vinyl polymers, silicon-containing polymers, fluorine-containing polymers or chitin and the like. However, the existing organic polymer membranes have the problems of poor water absorption rate, low permeation rate, poor stability and the like.
CN106853342A discloses a preparation method and application of a dehumidifying membrane for an air conditioner, belonging to the field of air conditioners. The raw materials of the dehumidifying membrane for the air conditioner comprise polyimide and a polymer prepolymer containing carboxylic ester groups, the polymer prepolymer containing carboxylic ester groups is good in hydrophilicity and can improve the water selectivity and permeability of the dehumidifying membrane for the air conditioner, and the polyimide belongs to a glassy polymer and is small in free volume, so that the gas permeability is weak.
CN105311968A discloses a preparation method of a separation membrane special for drilling fluid gas dehumidification, the separation membrane and a membrane separator, belonging to the technical field of gas dehumidification. The special separation membrane for dehumidifying the drilling fluid gas comprises a porous base membrane, a polytetrafluoroethylene coating and a PDMS coating, wherein the tetrafluoroethylene coating is positioned above the porous base membrane, and the PDMS coating is positioned above the polytetrafluoroethylene coating. The PDMS is a hydrophobic polymer, so that the water selectivity is not high, and the PDMS is only suitable for dehumidification occasions with high humidity.
Therefore, how to provide a gas dehumidification membrane with high permeability, good gas selectivity and good stability has become a technical problem to be solved in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a gas dehumidification film and a preparation method and application thereof. The gas dehumidification membrane has high permeability, good gas selectivity and good stability, preferentially permeates water vapor, has higher separation performance on the water vapor, and can be applied to the dehumidification of air, nitrogen or hydrogen and other gases.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a gas dehumidification membrane, which is prepared from polyether-b-polyamide (Pebax) and a hydrophilic electrolyte, wherein the mass ratio of the polyether-b-polyamide to the hydrophilic electrolyte is 3: 7-9: 1, such as 3:7, 2:3, 1:1, 3:2, 7:3, 4:1 or 9: 1.
The polyether-b-polyamide is a hydrophilic rubbery polymer and is a segmented copolymer, wherein a nylon PA (polyamide) rigid chain segment provides mechanical strength, and a polyether PE flexible chain segment provides a gas channel, so that the mechanical strength actually required by a dehumidifying membrane is met, and the dehumidifying membrane is ensured to have higher permeability; the hydrophilic electrolyte can improve the permeability coefficient of water vapor in the membrane and the selectivity of the water vapor and other gases, and the compounding use of the hydrophilic electrolyte and the polyether-b-polyamide solves the problem that the hydrophilic electrolyte does not form a membrane or has poor stability due to too strong brittleness after the membrane is formed.
In the present invention, the polyether-b-polyamide is a block copolymer.
Preferably, the polyether-b-polyamide comprises any one of Pebax1657, Pebax1074, Pebax4011 or Pebax2533 or a combination of at least two thereof. Combinations of the at least two, such as Pebax1657 and Pebax1074, Pebax4011 and Pebax2533, and the like.
In the present invention, the organic electrolyte sodium salt includes sodium isethionate, sodium diphenylamine sulfonate, sodium 4-amino-1-naphthalenesulfonate, sodium 3-carboxybenzenesulfonate, sodium N-hydroxythiosuccinimide, formaldehyde-sodium sulfoxylate adduct, sodium Tris ethanesulfonate, sodium 3-mercapto-1-propanesulfonate, sodium 4-hydroxybenzenesulfonate, sodium N-2-hydroxyethylpiperazine-N' -2-ethanesulfonate, sodium trihydroxymethylaminopropanesulfonate, sodium 2- (4-methoxyphenyl) hydrazino-sulfonate, any one or combination of at least two of sodium indigo disulfonate, sodium polyacrylate, sodium humate, sodium citrate, sodium hyaluronate, sodium 2-hydroxybutyrate, sodium gluconate, sodium 3-hydroxybutyrate, sodium lactate, sodium p-hydroxybenzoate, sodium p-aminosalicylate and sodium sulfosalicylate. Combinations of the at least two, for example, sodium isethionate and sodium diphenylamine sulfonate, sodium 4-amino-1-naphthalenesulfonate and sodium 3-carboxybenzenesulfonate, and the like.
In the present invention, the hydrophilic inorganic salt includes any one of lithium chloride, calcium chloride, or phosphorus pentoxide, or a combination of at least two thereof. Combinations of the at least two, such as lithium chloride and calcium chloride, lithium chloride and phosphorus pentoxide, and the like.
In another aspect, the present invention provides a method for preparing a gas dehumidifying membrane as described above, comprising the steps of:
and adding a hydrophilic electrolyte into the polyether-b-polyamide solution, defoaming, preparing a membrane, and removing residual solvent in the membrane to obtain the gas dehumidification membrane.
In the invention, the dissolution and blending of the polyether-b-polyamide and the hydrophilic electrolyte are physical processes, the operation condition is mild, the repetition is easy, and the method is favorable for industrialization.
In the present invention, the polyether-b-polyamide solution is a polyether-b-polyamide solution prepared by dissolving polyether-b-polyamide in a solvent to obtain a mass concentration of 0.1 to 20% (for example, 0.1%, 0.2%, 0.5%, 1%, 5%, 10%, 20%, or the like).
Preferably, the temperature of the dissolution is 70 to 110 ℃, for example, 70 ℃, 80 ℃, 90 ℃, 100 ℃ or 110 ℃.
In the invention, the solvent is ethanol and water in a mass ratio of 7: 3.
In the invention, the defoaming comprises any one of standing defoaming, negative pressure defoaming or ultrasonic defoaming or the combination of at least two of the standing defoaming, the negative pressure defoaming and the ultrasonic defoaming. And combinations of the at least two, such as standing defoaming and negative pressure defoaming, standing defoaming and ultrasonic defoaming.
Preferably, the membrane is formed by casting on a substrate or coating on a flat filter membrane.
Preferably, the substrate is a glass plate or a tetrafluoro plate.
In a further aspect, the present invention provides the use of a gas dehumidifying membrane as described above for dehumidifying a gas.
Compared with the prior art, the invention has at least the following beneficial effects:
the polyether-b-polyamide is a block copolymer, wherein a nylon PA (polyamide) rigid chain segment provides mechanical strength, and a polyether PE flexible chain segment provides a gas channel, so that the mechanical strength actually required by a dehumidifying membrane is met, and the high permeability of the dehumidifying membrane is ensured; the hydrophilic electrolyte can improve the permeability coefficient (35146.2-122895.3) of water vapor in the membrane and the selectivity of the water vapor and other gases, and the compounding use of the hydrophilic electrolyte and the polyether-b-polyamide solves the problem that the hydrophilic electrolyte does not form a membrane or has poor stability due to too strong brittleness after the membrane is formed; in addition, the dissolution and blending of the polyether-b-polyamide and the hydrophilic electrolyte are physical processes, the operation condition is mild, the repetition is easy, and the method is favorable for industrialization.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
In this embodiment, a gas dehumidifying film is provided, in which raw materials for preparing the gas dehumidifying film include polyether-b-polyamide (Pebax1074) and sodium hyaluronate, and a mass ratio of the Pebax1074 to the sodium hyaluronate is 3: 7. Wherein Pebax1074 is a block copolymer.
The preparation method comprises the following steps:
dissolving the Pebax1074 subjected to vacuum drying in ethanol and water in a mass ratio of 7:3, wherein the dissolving temperature is 100 ℃, stirring until the solution is uniform and transparent, preparing a Pebax1074 solution with the mass concentration of 0.1%, adding sodium hyaluronate into the Pebax1074 solution, stirring again until the solution is uniform and transparent, standing for defoaming, pouring the defoamed solution on a tetrafluoro plate, uniformly spreading the solution on the tetrafluoro plate, keeping the temperature of the tetrafluoro plate at 40 ℃, volatilizing the solvent to obtain a primary membrane, carefully taking the primary membrane off the tetrafluoro plate, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidifying membrane.
Example 2
In this embodiment, a gas dehumidifying film is provided, in which raw materials for preparing the gas dehumidifying film include polyether-b-polyamide (Pebax1074) and sodium hyaluronate, and a mass ratio of the Pebax1074 to the sodium hyaluronate is 1: 1. Wherein Pebax1074 is a block copolymer.
The preparation method comprises the following steps:
dissolving the vacuum-dried Pebax1074 in ethanol and water in a mass ratio of 7:3, stirring the solution at 90 ℃ until the solution is uniform and transparent to prepare a Pebax1074 solution with the mass concentration of 20%, adding sodium hyaluronate into the Pebax1074 solution, stirring the solution again until the solution is uniform and transparent, defoaming the solution under negative pressure, pouring the defoamed solution on a flat filter membrane to uniformly spread, keeping the temperature of the flat filter membrane at 50 ℃, volatilizing the solvent to obtain a primary membrane, carefully taking the primary membrane off the flat filter membrane, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidifying membrane.
Example 3
In this embodiment, a gas dehumidification film is provided, and raw materials for preparing the gas dehumidification film comprise polyether-b-polyamide (Pebax4011) and lithium chloride, wherein the mass ratio of the Pebax4011 to the lithium chloride is 9: 1. Wherein Pebax4011 is a block copolymer.
The preparation method comprises the following steps:
dissolving the Pebax4011 subjected to vacuum drying in ethanol and water in a mass ratio of 7:3, wherein the dissolving temperature is 70 ℃, stirring until the solution is uniform and transparent, preparing a Pebax4011 solution with the mass concentration of 0.5%, adding lithium chloride into the Pebax4011 solution, stirring again until the solution is uniform and transparent, standing for defoaming, pouring the defoamed solution on a glass plate, uniformly spreading the solution, keeping the temperature of the glass plate at 60 ℃, volatilizing the solvent to obtain a primary membrane, carefully taking the primary membrane off the glass plate, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidifying membrane.
Example 4
In this example, a gas dehumidifying membrane is provided, and the raw material for preparing the gas dehumidifying membrane comprises polyether-b-polyamide (Pebax1657) and lithium chloride, and the mass ratio of the Pebax1657 to the lithium chloride is 4: 1. Wherein Pebax1657 is a block copolymer.
The preparation method comprises the following steps:
dissolving the vacuum-dried Pebax1657 in ethanol and water in a mass ratio of 7:3, stirring the solution at the temperature of 80 ℃ until the solution is uniform and transparent, preparing a 1% Pebax1657 solution, adding lithium chloride into the Pebax1657 solution, stirring the solution again until the solution is uniform and transparent, defoaming the solution under negative pressure, pouring the defoamed solution on a tetrafluoro plate, uniformly spreading the solution on the tetrafluoro plate, keeping the temperature of the tetrafluoro plate at 45 ℃, volatilizing the solvent to obtain a primary membrane, carefully taking the primary membrane off the tetrafluoro plate, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidifying membrane.
Example 5
In this example, a gas dehumidifying membrane is provided, and the raw material for preparing the gas dehumidifying membrane comprises polyether-b-polyamide (Pebax1657) and lithium chloride, and the mass ratio of the Pebax1657 to the lithium chloride is 7: 3. Wherein Pebax1657 is a block copolymer.
The preparation method comprises the following steps:
dissolving the vacuum-dried Pebax1657 in ethanol and water in a mass ratio of 7:3, stirring the mixture at 110 ℃ until the mixture is uniform and transparent, preparing a 2% Pebax1657 solution, adding lithium chloride into the Pebax1657 solution, stirring the mixture again until the mixture is uniform and transparent, standing the mixture for defoaming, pouring the defoamed solution on a glass plate, uniformly spreading the defoamed solution, keeping the temperature of the glass plate at 55 ℃, volatilizing the solvent to obtain a primary membrane, carefully taking the primary membrane off the glass plate, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidification membrane.
Example 6
In this embodiment, a gas dehumidification membrane is provided, and raw materials for preparing the gas dehumidification membrane comprise polyether-b-polyamide (Pebax2533) and Tris sodium ethanesulfonate, wherein the mass ratio of the Pebax2533 to the Tris sodium ethanesulfonate is 1: 1. Wherein Pebax2533 is a block copolymer.
The preparation method comprises the following steps:
dissolving the Pebax2533 after vacuum drying in ethanol and water in a mass ratio of 7:3 at 85 ℃, and stirring until the solution is uniform and transparent to prepare a Pebax2533 solution with the mass concentration of 5%; adding Tris sodium ethanesulfonate into the Pebax2533 solution, stirring the mixture to be uniform and transparent again, performing ultrasonic defoaming, pouring the defoamed solution on a tetrafluoro plate, uniformly spreading the defoamed solution on the tetrafluoro plate, keeping the temperature of the tetrafluoro plate at 40 ℃, performing solvent volatilization to obtain a primary membrane, carefully taking the primary membrane off the tetrafluoro plate, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidification membrane.
Example 7
In this example, a gas dehumidification film is provided, and raw materials for preparation of the gas dehumidification film comprise polyether-b-polyamide (Pebax2533) and sodium humate, and the mass ratio of the Pebax2533 to the sodium humate is 1: 1. Wherein Pebax2533 is a block copolymer.
The preparation method comprises the following steps:
dissolving the vacuum-dried Pebax2533 in ethanol and water in a mass ratio of 7:3, stirring the mixture at the dissolving temperature of 95 ℃ until the mixture is uniform and transparent to prepare a 10% Pebax2533 solution, adding sodium humate into the Pebax2533 solution, stirring the mixture again until the mixture is uniform and transparent, standing the mixture for defoaming, pouring the defoamed solution on a flat filter membrane to uniformly spread the solution, keeping the temperature of the flat filter membrane at 60 ℃, volatilizing the solvent to obtain a primary membrane, carefully taking the primary membrane off the flat filter membrane, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidifying membrane.
Example 8
In this example, a gas dehumidification film is provided, and raw materials for preparing the gas dehumidification film comprise polyether-b-polyamide (Pebax1657) and sodium polyacrylate, and the mass ratio of the Pebax1657 to the sodium polyacrylate is 1: 1. Wherein Pebax1657 is a block copolymer.
The preparation method comprises the following steps:
dissolving the vacuum-dried Pebax1657 in ethanol and water in a mass ratio of 7:3, stirring the mixture at 105 ℃ until the mixture is uniform and transparent, preparing a 15% Pebax1657 solution, adding sodium polyacrylate into the Pebax1657 solution, stirring the mixture again until the mixture is uniform and transparent, standing the mixture for defoaming, pouring the defoamed solution on a tetrafluoro plate, uniformly spreading the defoamed solution, keeping the temperature of the tetrafluoro plate at 60 ℃, volatilizing the solvent to obtain a primary membrane, carefully taking the primary membrane off the tetrafluoro plate, drying the primary membrane in a vacuum oven for at least 3 days, and removing the residual solvent in the membrane to obtain the gas dehumidification membrane.
Comparative example 1
This comparative example differs from example 1 only in that the hydrophilic electrolyte sodium hyaluronate was not included in the starting materials for preparation.
The performance tests were performed on the gas dehumidifying membranes of examples 1 to 8 and comparative example 1, as follows:
(1) and (3) testing the water vapor permeability coefficient: according to the water vapor permeability test method of GB/T1037-1988, namely the cup method for the water vapor permeability test method of plastic films and sheets, a Labthink W3/031 water vapor permeability tester is adopted to test the water vapor permeability coefficient of the gas dehumidifying membrane, and the test conditions are as follows: the humidity difference between the two sides of the gas dehumidifying film sample is 90 percent at 25 ℃;
(2) and (3) testing nitrogen permeability coefficient: according to the gas permeability test method of GB/T1038-2000 'test method for gas permeability of plastic film and thin sheet-pressure differential method', a Labthink VAC-V2 pure gas permeability tester is adopted to test the nitrogen permeability coefficient of the gas dehumidifying membrane, and the test conditions are as follows: the pressure difference between the two sides of the gas dehumidifying film sample is 0.1MPa at 25 ℃.
The results of the performance tests are shown in table 1.
TABLE 1
As can be seen from Table 1, examples1-8, the gas dehumidification film is successfully prepared, which shows that the compounding use of the hydrophilic electrolyte and the polyether-b-polyamide solves the problem that the hydrophilic electrolyte does not form a film; compared with comparative example 1, the gas dehumidification membranes prepared in examples 1 to 8 all have higher water vapor permeability coefficients (35146.2-122895.3) and water vapor/nitrogen separation coefficients (1.1 × 10)5～1.8×107) This shows that the hydrophilic electrolyte can greatly improve the water vapor permeability coefficient and the water vapor/nitrogen separation coefficient of the gas dehumidifying membrane.
The applicant states that the present invention is described by the above embodiments, but the present invention is not limited to the above embodiments, that is, the present invention is not meant to be implemented by relying on the above embodiments. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The gas dehumidification membrane is characterized in that raw materials for preparing the gas dehumidification membrane comprise polyether-b-polyamide and hydrophilic electrolyte, wherein the mass ratio of the polyether-b-polyamide to the hydrophilic electrolyte is 3: 7-9: 1.
2. The gas dehumidifying membrane of claim 1, wherein the polyether-b-polyamide is a block copolymer;
preferably, the polyether-b-polyamide comprises any one of Pebax1657, Pebax1074, Pebax4011 or Pebax2533 or a combination of at least two thereof.
3. The gas dehumidifying membrane according to claim 1 or 2, wherein the hydrophilic electrolyte includes an organic electrolyte sodium salt and/or a hydrophilic inorganic salt.
4. The gas dehumidifying membrane of claim 3, wherein the sodium salt of the organic electrolyte comprises sodium isethionate, sodium diphenylamine sulfonate, sodium 4-amino-1-naphthalenesulfonate, sodium 3-carboxybenzenesulfonate, sodium N-hydroxythiosuccinimide, sodium formaldehyde-sodium sulfoxylate adduct, sodium Tris ethanesulfonate, sodium 3-mercapto-1-propanesulfonate, sodium 4-hydroxybenzenesulfonate, sodium N-2-hydroxyethylpiperazine-N' -2-ethanesulfonate, sodium trihydroxymethylaminopropanesulfonate, sodium 2- (4-methoxyphenyl) hydrazino sulfonate, sodium indigo disulfonate, sodium polyacrylate, sodium humate, sodium citrate, sodium hyaluronate, sodium 2-hydroxybutyrate, sodium gluconate, sodium 3-hydroxybutyrate, sodium N-hydroxybutanoate, sodium Tris-hydroxymethanesulfonate, sodium Tris-ethanesulfonate, sodium 3-mercaptoethanesulfonate, sodium Tris-hydroxy-1-propanesulfonate, sodium Tris-hydroxymethanesulfonate, sodium salt, Any one or the combination of at least two of sodium lactate, sodium p-hydroxybenzoate, sodium p-aminosalicylate and sodium sulfosalicylate.
5. The gas dehumidifying membrane of claim 3 or 4, wherein the hydrophilic inorganic salt comprises any one of lithium chloride, calcium chloride or phosphorus pentoxide, or a combination of at least two thereof.
6. The method of manufacturing a gas dehumidifying membrane as claimed in any one of claims 1 to 5, comprising the steps of:
and adding a hydrophilic electrolyte into the polyether-b-polyamide solution, defoaming, preparing a membrane, and removing residual solvent in the membrane to obtain the gas dehumidification membrane.
7. The preparation method according to claim 6, wherein the polyether-b-polyamide solution is prepared by dissolving polyether-b-polyamide in a solvent to obtain a polyether-b-polyamide solution with a mass concentration of 0.1-20%;
preferably, the dissolving temperature is 70-110 ℃.
8. The production method according to claim 6 or 7, wherein the solvent is ethanol and water at a mass ratio of 7: 3.
9. The production method according to any one of claims 6 to 8, wherein the defoaming includes any one of standing defoaming, negative pressure defoaming, or ultrasonic defoaming, or a combination of at least two of them;
preferably, the film preparation is film casting on a substrate or film coating on a flat filter membrane;
preferably, the substrate is a glass plate or a tetrafluoro plate.
10. Use of a gas dehumidifying membrane according to any one of claims 1-5 for dehumidifying a gas.
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| CN113896220A (en) * | 2021-10-22 | 2022-01-07 | 天津工业大学 | Cerium fluoride porous nanosheet adjusted mixed matrix membrane and preparation method and application thereof |
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