54 results about "Pervaporation" patented technology

The invention relates to the technical field of membrane separation materials, in particular to a mixed matrix membrane and a preparation method and application thereof. The mixed matrix membrane comprises: (1) a polymer functional membrane; (2) a base film for supporting the polymer functional film; a polymer in the polymer functional film comprises a polymer with a structure as shown in a formula (a), in the formula (a), R0 is an alkylene chain, R1 is a polysiloxane group, R2 is alkyl or hydrogen, and m is equal to 1-20. According to the present invention, the functional membrane prepared from the polymer having the structure (a) is used, and the structure of the polysiloxane is designed and optimized, such that the mixed matrix membrane has excellent organic solvent tolerance and organic solvent pervaporation separation property, and the interfacial compatibility between the polymer and the porous filler can be improved.

The invention discloses a preparation method and application of an MFI zeolite membrane.The preparation method comprises the steps that an MFI zeolite nanosheet serves as a seed crystal, a uniformly-distributed and compact seed crystal layer is prepared on a carrier through a vacuum filtration method, namely, a nucleation center crystallized into a membrane is loaded on the surface of the carrier, and directional growth and membrane forming of the zeolite nanosheet can be effectively controlled; the highly b-oriented MFI zeolite membrane can be prepared within several hours, the prepared b-oriented MFI zeolite membrane shows a continuous and compact microstructure and almost has no defects, and compared with a traditional hydrothermal method, the method overcomes the defects that the reaction process is too long in time consumption, uneven in heating is prone to occurring, and the like. And therefore, the time required by crystal growth is greatly shortened. The prepared MFI zeolite membrane can be applied to pervaporation separation of xylene isomers, shows good size screening separation performance, and has important industrial application value.

The invention discloses a membrane separation experiment device and an experiment method thereof.The membrane separation experiment device comprises a raw material supply assembly, a heating assembly, a first separation assembly, a second separation assembly and a vacuum assembly, the raw material supply assembly comprises a raw material tank and an extraction part, and the raw material tank is connected with the extraction part; the heating assembly is connected with the extraction piece, and the heating assembly is used for heating the raw materials; the first separation assembly is connected with the heating assembly, and the first separation assembly is used for separating the mixed liquid; the second separation assembly is used for separating the mixed liquid before the first separation assembly works so as to determine optimal experiment parameters; the vacuum assembly is connected with the first separation assembly and the second separation assembly. According to the invention, continuous pervaporation separation of the mixed liquid can be realized, the problem of sealing failure or leakage of the first separation assembly caused by a high-temperature medium or fluid is avoided, and the risks of energy consumption waste and misoperation caused by unreasonable experimental parameters are reduced.

The disclosure relates to a purification system and a purification bag (6) for use therein, configured for (solar) heat-driven water purification of contaminated water. The purification bag (6) comprises a distillation assembly (601,..60n), comprising: - a contaminated water chamber (30) for collecting contaminated water, the contaminated water chamber (30) comprising a top sheet configured for absorbing heat; - a purified water chamber (50) for collecting purified water, the purified water chamber (50) comprising a condensation sheet configured for collecting condensed purified water; - a membrane (40) arranged between the top sheet and condensation sheet, the membrane dividing the distillation assembly into the contaminated water chamber (30) and the purified water chamber (50), wherein the membrane (40) comprises a membrane sheet configured for separation of the associate part of the contaminated water portion received by the distillation assembly into the purified water portion and a residual water portion comprising water and contaminants remaining in the contaminated water chamber by at least one of membrane distillation and pervaporation through the membrane sheet; wherein the top sheet and the membrane sheet are polymeric sheets that are bonded to each other by welding according to a welding pattern.

This device for recovering water from organic substance-containing drainage water recovers water by treating drainage water that contains a volatile organic substance or a low-molecular-weight organic substance having a molecular weight of at most 200, and comprises a separation membrane module 2 for subjecting the drainage water to a pervaporation treatment by using a separation membrane having a pore diameter of 3.0-4.2 Å, wherein treated water from which the organic substance has been removed by the separation membrane module 2 is recovered.

The invention discloses a pervaporation-membrane distillation coupling separation method for advanced urine water reuse, and belongs to the technical field of water treatment. The method comprises the following steps: soaking a microporous hydrophobic membrane in a strong alkali solution, and treating at 60-80 DEG C for 4-6 hours; preparing a gel precursor solution through a gel monomer and a cross-linking agent, and coating the gel precursor solution on the surface of one side of the hydrophobic microporous membrane; stabilizing the human urine; the coupling separation membrane with the pervaporation functional layer and the hydrophobic substrate is placed in a membrane pool with the effective working area of 10 cm < 2 >; urine and pure water circulate on the two sides of the separation membrane respectively; one side of a urine feeding liquid is heated to 60 DEG C by using a water bath kettle, and 300-500ml of pure water is used as a condensate; after the urine is treated until about 90% of water is recycled, the feed liquid is replaced with pure water to wash the separation membrane. According to the invention, the problems of low water recovery rate and low reuse water quality in the urine treatment process of the traditional distillation membrane are solved, the reuse rate of urine water is greatly improved, the separation membrane is not wetted, and the conductivity of discharged water is greatly reduced.

The invention discloses continuous production equipment and process for grape spirit, and relates to the technical field of grape wine. The production equipment comprises a nanofiltration treatment unit, a continuous pervaporation separation treatment unit and a desulfurization unit. The nanofiltration treatment unit comprises a nanofiltration membrane group and a valve I, and the nanofiltration membrane group is used for separating wine raw materials to obtain nanofiltration permeate. The valve I is used for controlling the circulating filtration process of the nanofiltration treatment unit. The continuous pervaporation separation treatment unit comprises a condensation section and a plurality of treatment sections. The treatment section comprises a pervaporation separation membrane group, and the pervaporation separation membrane group is used for carrying out separation treatment on the nanofiltration permeate liquid to obtain permeate gas. The permeation sides of the plurality of treatment sections converge to the condensation section and are used for condensing the permeation gas to obtain condensate. The desulfurization unit comprises a desulfurization tower and is used for carrying out desulfurization treatment on the condensate. Compared with the prior art, the continuous production equipment and process for the grape spirit can improve the production efficiency and quality.

To provide a water recovery apparatus which recovers water from drain water containing volatile organic matters and organic compounds of a low molecular weight in a closed system space of a spaceship interior or a lunar base or the like, and in which oxygen supply is unnecessary or a small amount thereof is sufficient, and further, which does not require consumables on the premise of exchange of activated carbon or the like.SOLUTION: A water recovery apparatus for recovering water by processing drain water containing volatile organic compounds or low molecular weight organic compounds of a molecular weight of 200 or lower, comprises a separation membrane module 2 for subjecting the drain water to pervaporation processing using a separation membrane with a pore size of 3.0-4.2 Å. The apparatus for recovering water from drain water containing organic compounds recovers treated water from which organic compounds have been removed by to the separation membrane module 2.SELECTED DRAWING: Figure 1

The application belongs to the technical field of novel separation membrane materials, and discloses an ionic covalent organic framework membrane as well as a preparation method and application thereof. An amine monomer and an aldehyde monomer are respectively dissolved in water and an organic solvent, and a continuous defect-free ionic covalent organic framework membrane is formed in situ on the surface of a carboxylated porous support base membrane through a limited interface polymerization method. The membrane structure and separation performance can be optimized by adjusting the monomer concentration and reaction time. The preparation process is simple and controllable, the prepared membrane is applied to pervaporation butanol-water separation, and high permeability and high selectivity are exhibited, and the prepared membrane also has good long-term operation stability. In addition, the prepared membrane can also be applied to other kinds of alcohol-water separation and pervaporation salt-water separation, and has good universal application.

The application provides a composite pervaporation desalination membrane and a preparation method and application thereof. The composite pervaporation desalination membrane comprises a separation layer with a separation function and an organic porous base membrane layer serving as a support; the raw materials of the separation layer comprise a polyvinyl alcohol aqueous solution, a PFSA-g-GO nanocomposite and a crosslinking agent, the addition amount of the PFSA-g-GO nanocomposite is 0.2-4.5 mass%, the addition amount of the crosslinking agent is 1-10 mass%, and the mass% is the percentage of the mass of each component to the mass of the polyvinyl alcohol; and the organic porous base membrane layer is a polyacrylonitrile membrane or a polyethersulfone membrane. The preparation method is simple and easy to implement, and has low cost, and can simultaneously improve the water flux and desalination rate of the composite pervaporation desalination membrane.

The invention discloses a method for preparing a molecular sieve membrane from a super-dilute reaction solution, and belongs to the technical field of inorganic membrane materials and membrane separation. The method comprises the following steps: preparing a mixed solution of an aluminum source and a silicon source through an inorganic alkali system, aging to obtain a first reaction solution, and performing hydro-thermal synthesis to obtain a high-activity nano FAU seed crystal; uniformly loading seed crystals on the surface of the porous support body to form a compact seed crystal layer; a super-dilute second reaction solution is further used for short-time hydrothermal growth, and controllable construction of the FAU molecular sieve membrane is achieved. According to the method, the ultrathin FAU film with crystal alternation and compact structure can be obtained, film defects are remarkably reduced, and an organic template agent and high-temperature calcination treatment are not needed. The obtained membrane shows excellent performance in pervaporation dehydration, the total flux can reach 6.3 kg / (m.h), the separation factor is as high as 1413, and the membrane is far superior to an FAU membrane prepared from a traditional micron seed crystal and a high-concentration solution system, and can be widely applied to the fields of organic solvent dehydration, green solvent purification, gas separation, membrane reactors and the like.

The invention belongs to the technical field of separation membranes, and discloses a composite pervaporation desalination membrane and a preparation method and application thereof, the composite pervaporation desalination membrane sequentially comprises a bottom layer, a positively charged porous support layer and a compact selection layer; the positively charged porous supporting layer comprises a sublayer and a surface layer, the sublayer is attached to the bottom layer, and a compact selection layer is attached to the surface layer; the dense selection layer is made of polyvinyl alcohol crosslinked by amino-terminated hyperbranched polyamide and poly (4-styrenesulfonic acid-co-maleic acid) sodium salt. The composite pervaporation desalination membrane provided by the invention has a moderate surface pore size of the support layer, the support layer for enhancing the charge effect and the loose hydrophilic compact selection layer, and further has high permeation flux on the premise of ensuring efficient interception of salt.

This invention discloses a method for preparing an internally pressurized MOF-based hollow fiber composite membrane module, belonging to the field of membrane separation technology. The invention involves introducing an aqueous solution containing metal ions and an organic solution containing organic ligands into the shell side and tube side of a hollow fiber membrane module, respectively. By controlling the number of reactions between metal ions and organic ligands on the inner surface of the hollow fiber membrane, a continuous MOF functional layer is precisely constructed. Subsequently, a low-concentration polymer solution is used to repair defects in the MOF layer, resulting in an internally pressurized MOF-based hollow fiber composite membrane module, which is then applied to pervaporation ethanol / water separation. This method simplifies the preparation process of the internally pressurized hollow fiber composite membrane module; the thin inner surface MOF layer reduces molecular diffusion resistance and enhances molecular mass transfer; the surface-coated polymer matrix effectively repairs MOF layer defects, further enhancing molecular separation selectivity and effectively protecting the MOF functional layer; and it enhances the long-term stability of the membrane module.

Described herein is a preparation method of C-ZIF-67-derived nano-porous carbon doped PDMS mixed matrix membrane based on a tubular ceramic carrier and its application in pervaporation of low-concentration ethanol aqueous solution to recover ethanol by synthesizing ZIF-67 crystals and carbonizing the ZIF-67 crystal to obtain C-ZIF-67 filler particles. According to the present application, the nano-porous carbon particles derived from ZIF-67 are prepared by a high-temperature calcination method, and are fully carbonized at a certain calcination temperature, so that the disappearance of characteristic groups after carbonization can reduce the influence of surface electrical properties, and the particle size is reduced. At the same time, the MOF skeleton structure is still retained after carbonization, the pore size is enlarged, and the carbon material also has strong hydrophobicity.

A highly stable ceramic-based sub-nanoporous graphene composite membrane and its precision separation applications are disclosed, belonging to the field of environmental membrane separation technology. This composite membrane introduces an inorganic transition layer on the outer surface of an inorganic ceramic substrate with sheet-like, hollow fiber, or tubular configurations, increasing its bonding strength with the graphene separation layer. The thickness and pore structure of the composite membrane are precisely controlled by changing the filtration time, filtrate concentration, crosslinking agent content, and high-temperature reduction temperature and time. Through optimization of the preparation conditions, a highly stable ceramic-based sub-nanoporous graphene composite membrane was obtained. This composite membrane can achieve efficient and precise separation applications through pervaporation processes, such as seawater desalination, high-salinity wastewater desalination, boron removal from seawater and geothermal wastewater, and other wastewater (such as antibiotic wastewater and low-concentration volatile organic pollutant wastewater), exhibiting excellent separation performance and stability in extreme environments.

The application belongs to the technical field of separation membranes, and discloses a zwitterionic modified graphene oxide double-layer structure composite membrane and a preparation method thereof. First, a graphene oxide layer is formed on the surface of a porous supporting base membrane by a vacuum-assisted self-assembly method, and then a zwitterionic layer is constructed on the surface of the graphene oxide layer by a biomimetic co-deposition method to obtain a double-layer structure composite membrane. The zwitterionic layer on the top can improve the hydrophilicity of the membrane surface, strengthen the dissolution process of water molecules on the membrane surface, and improve the separation selectivity; the graphene oxide layer on the bottom serves as a rapid mass transfer channel for molecules, strengthens the diffusion process of molecules, and improves the permeability of the membrane; dopamine can improve the interfacial compatibility between layers, which is conducive to the stability of the membrane structure. The composite membrane prepared by the application can realize the pervaporation process of preferential dissolution and preferential diffusion of water molecules, obtain high permeation flux and high separation factor, and maintain good long-term operation stability, and has certain universality, good application prospect, and the like.

The application discloses a kind of zwitterionic covalent organic framework membranes and preparation method and application thereof, belong to the technical field of separation membrane material, continuous covalent organic framework membrane is in-situ constructed on the surface of porous support base film by interfacial polymerization reaction, then the membrane is sequentially soaked in organic phase solution containing polyacyl chloride and aqueous solution containing zwitterion, and zwitterionic covalent organic framework membrane is obtained after heat treatment.The continuous covalent organic framework membrane hole channel is through, can be used as the rapid transfer channel of molecule, it is favorable to obtain high permeation flux;Zwitterionic is carried out on its surface, on the one hand, the hydrophilicity of membrane surface can be improved, on the other hand, the pore structure of membrane surface can be controlled, while forming water selective transport channel, competitive alcohol molecules are excluded.The preparation method of the application is simple and controllable, and the prepared composite membrane is used in pervaporation ethanol dehydration process, and excellent separation performance and long-term operation stability are shown.

This invention relates to the field of environmental protection equipment, specifically to a pressure regulation device based on a dialysis-denitrification process. The device includes a pressure-regulating unit, which comprises a housing and a pressure-regulating rotating component. The housing has a chamber in which the pressure-regulating rotating component is rotatably disposed. The rotating component has an annular liquid passage, which includes a pressure-stabilizing section, a pressure-increasing section, and a pressure-relieving section. All three sections are arc-shaped, with the width of the pressure-relieving section greater than that of the pressure-stabilizing section, which is also greater than that of the pressure-increasing section. The center of the annulus coincides with the rotation center of the rotating component. One side of the housing has an inlet for connection to a pervaporation assembly, and the other side has an outlet, located on opposite sides of the liquid passage. The pressure-regulating rotating component at the pressure-increasing section has a larger blocking area than at the pressure-stabilizing section, which is also larger than that at the pressure-relieving section, for the inlet. This invention allows for micro-pressurization of the pervaporation assembly without the introduction of a pump, while minimizing the impact on the pressure of the dialysis assembly.

The present application relates to a kind of Mo-MFI molecular sieve membrane and its preparation method and application, belong to molecular sieve membrane material preparation and separation application technical field.The present application is doped with Mo element to MFI molecular sieve membrane, significantly improve the performance of molecular sieve membrane in ethanol / water pervaporation separation.Compared with traditional MFI molecular sieve membrane and W doped MFI molecular sieve membrane, Mo doped MFI molecular sieve membrane exhibits higher permeation flux and separation factor.

The application belongs to the technical field of chemistry and chemical industry, and particularly relates to a method for regenerating and utilizing waste stripping liquid of photoresist. The waste stripping liquid of photoresist is regenerated and utilized by the following steps: realizing waste liquid demulsification, viscosity reduction and impurity removal through specific modified magnetic nanoparticles, then carrying out pervaporation dehydration through a zeolite membrane covered with a zirconium-tannic acid-polyethyleneimine metal organic coordination network layer, and finally carrying out adsorption polishing and recombination, so that the waste stripping liquid of photoresist is regenerated and utilized, the water removal rate of the waste liquid is greater than 99.9%, and the recovery rate of effective components in the waste liquid is greater than 99.5%.

The application relates to a preparation method of a uniform and dense priority alcohol-permeable composite membrane, and belongs to the field of membrane separation and technology. The method comprises the following steps: adding a catalyst A containing a copper ion compound, a graphdiyne synthesis monomer and an organic polymer into ethanol, mixing and reacting under certain conditions to prepare a graphdiyne / organic polymer membrane liquid A, and loading the membrane liquid A on a base film through a certain method. A polymer crosslinking agent and a catalyst B are mixed in a certain proportion to prepare a membrane liquid B. The membrane liquid B is heated to make the crosslinking agent vapor fill the container, the graphdiyne / organic film loaded on the base film is placed in the container, the reaction between the organic and the crosslinking agent occurs on the surface of the film, and after the reaction is completed, the film is placed in an environment at 80 DEG C to sufficiently perform a thermal crosslinking reaction. The obtained separation layer is higher in compactness and smaller in thickness, no solvent is used in the gas-solid / gas-liquid interface reaction process, the membrane is more uniform and dense, has higher pervaporation alcohol-permeable performance, and can efficiently and stably recover ethanol.

The invention provides a method for separating trace organic matters in water based on non-isothermal pervaporation, which comprises the following steps: additionally arranging a conductive porous support membrane (carbon nanotube membrane) on one side of pervaporation separation membrane penetrating fluid, and electrically heating the support membrane part; the temperature of the penetrating fluid side of the pervaporation separation membrane is higher than that of the raw material liquid side of the pervaporation separation membrane, so that the micro-temperature gradient of the pervaporation separation membrane is formed. According to the method, the temperature trade-off effect influencing flux and separation factors is eliminated in a mode of actively creating temperature gradient (non-isothermal) in a microenvironment, high selectivity and good treatment capacity can be achieved at the same time, and the method has a remarkable effect on improvement of pervaporation performance.

The invention relates to a preparation method and application of an MOF-801-coated CS membrane, and belongs to the technical field of preparation and separation application of MOF membrane materials. The invention provides a method for preparing the MOF-801 membrane in an amplified manner, defects of the membrane are repaired by coating the chitosan, the mechanical property of the membrane is improved, and the performance of the membrane in pervaporation separation of methanol / dimethyl carbonate is improved.

The invention discloses a self-crosslinking photo-thermal pervaporation composite membrane which comprises a basement membrane (1) subjected to plasma treatment and graphene oxide (2) directly self-crosslinked on the surface of the basement membrane, and a preparation method of the composite membrane comprises the following steps: preparing a graphene oxide dispersion liquid by adopting a hammers method; the particle size of the graphene oxide is 100 to 200 nm; the preparation method comprises the following steps: preparing a graphene oxide dispersion liquid, carrying out plasma treatment on a substrate membrane, uniformly adding the graphene oxide dispersion liquid onto the substrate membrane subjected to plasma treatment in a fixed mold, carrying out blast drying at 75-85DEG C for 1.5-2.5 h so that graphene oxide is self-crosslinked, and carrying out crosslinking between graphene oxide and the substrate membrane to obtain the self-crosslinked photo-thermal pervaporation composite membrane. The composite membrane is high in flux, blockage and pollution caused by temperature control or salt crystallization are avoided, the preparation method is simple and environmentally friendly, the composite membrane is applied to solar seawater desalination equipment and systems, the membrane flux is high, and the system operation stability is good.

The invention discloses a c-PEI-ZIF-8 mixed matrix membrane based on a reverse filling method and a preparation method and application thereof.According to the c-PEI-ZIF-8 mixed matrix membrane based on the reverse filling method, a ZIF-8 layer is constructed on a PAN base membrane firstly through the reverse filling method, then gaps are accurately filled with a PEI solution, finally, trimesoyl chloride (TMC) is used for conducting surface crosslinking on the PEI-ZIF-8 mixed matrix membrane, drying is conducted, and the c-PEI-ZIF-8 mixed matrix membrane is obtained. And the c-PEI-ZIF-8 mixed matrix membrane is obtained. The c-PEI-ZIF-8 mixed matrix membrane prepared by the invention is compact and defect-free, can simultaneously show high separation selectivity and high permeation flux during MeOH / DMC pervaporation separation, also has structural stability, and can ensure the separation performance temperature; in addition, the method is simple in technological process and mild in operation condition, and has good repeatability and large-scale production potential.

The present invention provides a three-layer composite membrane for dehydration of a dipole aprotic solvent and a preparation method thereof, relating to the technical field of membrane materials. The present invention comprises the following steps: soaking a base membrane in pure water to remove impurities, and drying the base membrane after the impurities are removed; soaking the dried base membrane in a pore retaining agent for 3 to 5 hours, taking it out and soaking it in pure water for 10 to 20 minutes; taking out the base membrane soaked in pure water and draining it, soaking it in a monomer aqueous solution for 1 to 10 minutes, draining it after the soaking is completed, and setting it aside; soaking the treated base membrane in an organic solution containing a polyacyl chloride for 1 to 10 minutes, wherein the concentration of the polyacyl chloride is 0.05wt.%-2wt.%; taking out the treated base membrane and heat-reacting it at 50-70°C for 1 to 10 minutes to form an intermediate layer on the base membrane; spin-coating a BTESE sol on the intermediate layer; and heat-retaining the spin-coated membrane at 100-200°C for 5-30 minutes and repeating the spin-coating to obtain a three-layer composite membrane. The three-layer composite membrane of the present invention can perform pervaporation dehydration on a dipolar aprotic solvent, thereby improving dehydration efficiency, reducing energy consumption and increasing product purity.

The application discloses a kind of organic silicon membrane with loose transition layer and its preparation method and application, belong to membrane separation technical field.The application is reacted with carbon nanotube and acid, washing, drying, obtain carboxylated carbon nanotube COOH-CNTs;And with SiO2-ZrO2 Sol mixed evenly, obtain COOH-CNTs / SiO2-ZrO2 Sol;It is coated to tubular ceramic support, calcination obtains ceramic support with loose transition layer;Organic silicon sol is coated to the ceramic support with loose transition layer obtained, heat treatment forms separation layer, obtains the organic silicon membrane.COOH-CNTs of the application can be dispersed into linear grid with sol particle, and itself has hydrophilic and pore structure, can make more water molecules pass quickly, reduce the permeation resistance of water molecule in transition layer and separation layer, in pervaporation separation solvent / water solution, it shows better separation performance.

The application discloses a perovskite / high polymer pervaporation composite membrane and a preparation method thereof. The perovskite / high polymer pervaporation composite membrane is prepared by taking silica sol with a certain particle size as a precursor to prepare perovskite, then mixing the dispersed perovskite with a high polymer solution and a crosslinking agent, and coating the mixture to obtain the perovskite / high polymer pervaporation composite membrane. The perovskite contained in the pervaporation composite membrane is a highly hydrophilic material, has the property of preferentially adsorbing water, and the porous perovskite is highly dispersed in the matrix and has the property of promoting the diffusion of water molecules. The surface of the membrane and the membrane can also form special channels for water molecule transmission through the "through" effect of the perovskite, so that the permeation flux and selectivity of the pervaporation composite membrane to the separated components can be simultaneously increased.

The application discloses a kind of green preparation methods of hydrophilic ZSM-5 zeolite membrane and its application, belong to inorganic membrane separation technical field.The application includes the following steps: S1, precoat ZSM-5 seed on the surface of porous carrier;S2, silicon source, aluminum source, alkali source, deionized water and isopropyl alcohol are mixed, and stirring is obtained even organic ammonium template-free synthesis liquid;S3, the porous carrier of precoat seed is placed in the synthesis liquid, and hydrothermal crystallization reaction is carried out;S4, after reaction, membrane body is taken out, and washed to neutral with deionized water, after drying, calcination treatment, obtain hydrophilic ZSM-5 zeolite membrane.The application avoids the high cost and environmental pollution problem caused by organic ammonium template from root, and the prepared zeolite membrane shows excellent separation performance in pervaporation dehydration of ethanol, isopropyl alcohol, acetone and other various organic solvent-water systems, and has good industrial application prospect.

This invention discloses a method for the continuous preparation of molecular sieve membranes with zero chemical emissions, as well as the resulting molecular sieve membranes and their applications, belonging to the field of molecular sieve membrane preparation and membrane separation technology. The method first constructs a molecular sieve seed layer on the outer or inner surface of a porous support. Then, the support is loaded into a membrane synthesis assembly with a first and a second flow channel isolated from each other. A first precursor phase containing a silicon source and no organic structure-directing agent, and a second precursor phase containing an aluminum source, an organic structure-directing agent, and an alkali source flow continuously on opposite sides of the support. By controlling the pressure on both sides, the two phases are controlled to mix and crystallize at the seed layer interface, thereby continuously forming a molecular sieve membrane. The two precursor phases that do not participate in the membrane-forming reaction are recycled after flowing out, achieving closed-loop utilization of all components of the precursor materials and zero discharge of synthetic waste liquid. This method can be used for the continuous and efficient preparation of molecular sieve membranes with various topologies. The resulting membranes are suitable for gas separation, liquid separation, pervaporation, organic matter dehydration, ammonia separation, and catalytic membrane reactions.