10 results about "Membrane synthesis" patented technology

A composite membrane that includes a polymeric substrate that defines a plurality of pores and a metal organic framework formed within the pores of the substrate. The metal organic framework is formed through interfacial synthesis of an aqueous metal ion and an organic ligand solution within the pores of the substrate. Methods for membrane synthesis are provided that may include a first growth phase and a second growth phase within the pores of the polymeric substrate. The composite membranes may be incorporated into a housing / module for use in gas separation, e.g., in gas separation facilities, including flue gas sorption plants, direct air capture plants, natural gas sweetening pipelines, and olefin / paraffin separation towers.

The utility model discloses coating equipment for molecular sieve membrane synthesis, which comprises a base, the periphery of the top of the base is fixedly provided with a fixed support, the top of the fixed support is fixedly provided with a connecting plate, the top of the connecting plate is fixedly provided with a motor through a support, and the output end of the motor is fixedly provided with a threaded rod. A threaded sleeve is installed on the front surface of the threaded rod in a threaded mode, a frame is fixedly installed at the bottom of the threaded sleeve through a support, an electric telescopic rod is fixedly installed on the inner wall of the frame, and a polished rod is fixedly installed at the lower end of the inner wall of the frame. According to the technical scheme, the problems that the existing coating equipment for the molecular sieve membrane does not have an automatic adjusting function, most of the existing coating equipment is manually adjusted, the market share is indirectly reduced, the workload of a user is increased, meanwhile, the precision of manual adjustment is greatly reduced, and the use requirements of people cannot be met are solved.

The invention discloses a method for synthesizing a hierarchical pore MFI molecular sieve membrane based on a sacrificial crystal seed layer, and belongs to the field of zeolite molecular sieve membrane synthesis. The hierarchical pore MFI molecular sieve membrane with a compact selective top layer and a macroporous transition layer with high porosity is successfully constructed on a porous carrier through a surface wet gel secondary growth technology of a sacrificial crystal seed layer. The film layer structure and the gas separation performance are optimized by regulating and controlling the composition, the aging time and the crystallization time of the synthetic gel. The prepared hierarchical pore MFI molecular sieve membrane shows high permeability and excellent selectivity in n-butane / iso-butane separation, and the preparation process is good in repeatability, high in stability and suitable for industrial gas separation application.

The application discloses a kind of water treatment composite filter membrane and preparation method thereof, belong to membrane separation technical field, a kind of water treatment composite filter membrane described in the application, including Ag-PAN base membrane and HOFs coating, the Ag-PAN base membrane is handled grafting with 4-vinyl benzyl mercaptan, HOFs coating is modified with 5-hexene-1 alcohol olefin.The application further provides a kind of preparation method of water treatment composite filter membrane: S1.AgNPs (silver nanoparticles) synthesis;S2.Ag-PAN base membrane is grafted after preparation;S3.HOFs crystal synthesis is modified with olefin;S4.Ag-PAN-HOFs composite filter membrane synthesis.The filter membrane prepared in the application has excellent antibacterial performance and self-repairing ability, stable structure, not easy to fall off in the water treatment process, is conducive to long-term stable use in the water treatment process.

The invention belongs to the technical field of membrane separation, and relates to a method for preparing an AEI type zeolite molecular sieve membrane by a secondary growth hydrothermal method. The method comprises the steps that firstly, a prepared AEI type molecular sieve serves as a large seed crystal, a ball-milled AEI type molecular sieve serves as a small seed crystal, the AEI type molecular sieve is used for inducing growth of an AEI phase in a membrane layer, the compact AEI type zeolite membrane is prepared through a secondary hydrothermal synthesis method, and when the membrane is used for acetic acid-water separation, the separation performance is excellent. According to the method, the AEI molecular sieve is used as a seed crystal to induce the growth of the AEI membrane, the FAU molecular sieve is used for replacing traditional NaAlO2 to serve as an aluminum source, and the silicon-aluminum ratio of a membrane layer can be regulated and controlled by regulating and controlling the silicon-aluminum ratio in the membrane synthesis mother liquor. The invention provides the preparation method of the AEI type zeolite molecular sieve membrane with few defects, high density and firm combination with the carrier, and the controllable preparation of the high-performance AEI molecular sieve membrane is realized.

This invention discloses a method for synthesizing silver-loaded molecular sieve membranes and their applications in the field of molecular sieve membrane synthesis technology. The synthesis method includes the following steps: S1, modifying an alumina substrate with aminopropyltriethoxysilane to obtain a functionalized alumina substrate; S2, mixing and reacting an organosilicon source, a sodium source, a silver source, and a solvent to obtain a metal precursor solution, then sequentially adding a colloidal silica solution and aluminum foil, mixing thoroughly to obtain a molecular sieve membrane synthesis solution; S3, contacting the molecular sieve membrane synthesis solution with the functionalized alumina substrate, and obtaining the membrane after hydrothermal reaction, drying, and calcination. The method for synthesizing silver-loaded LTA-type molecular sieve membranes of this invention is simple, rapid, and highly reproducible. The molecular sieve membrane synthesized using this method exhibits good density, uniform distribution of Ag particles within the pores, and small particle size, making it widely applicable in catalysts, separation membranes, and other fields, with high practical value and economic benefits.

The application discloses a method for synthesizing a hierarchical-pore MFI molecular sieve membrane based on a sacrifice seed layer and belongs to the field of zeolite molecular sieve membrane synthesis. The application successfully constructs a hierarchical-pore MFI molecular sieve membrane with a dense selective top layer and a macroporous transition layer with high porosity on a porous carrier through a surface wet gel secondary growth technology of a sacrifice seed layer. The membrane layer structure and gas separation performance are optimized by adjusting and controlling a synthesis gel composition, an aging time and a crystallization time. The hierarchical-pore MFI molecular sieve membrane has high permeability and excellent selectivity in n-butane / isobutane separation, has good preparation process repeatability and high stability, and is suitable for industrial gas separation application.

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.

Synthesis of crystalline CHA Zeolite powder and highly oriented defect-free CHA Zeolite membrane is described herein by the secondary growth of small pore silicoaluminophosphate powder having chabazite (CHA) type framework crystals from economic raw material Zeolite films are formed through the gradual growth and integration of individual zeolite seed crystals within a designated seed layer and through the secondary growth method by synthesizing the membrane of the zeolites using a hydrothermal process. Thereby generating defect-free membranes with improved permeance by utilizing the smaller seed crystals typically ranging from 2 to 5 μm. Ultrasound has been used to accelerate the crystallization process by enhancing mass transfer, promoting uniform nucleation, and facilitating the dispersion of precursor materials as well as to improve productivity in terms of enhanced adherence of seed crystals to support surfaces, leading to crystal quality and morphology that leads to faster synthesis times, as evidenced by the rapid generation of seed crystals.

The invention belongs to the technical field of membrane separation, and discloses a recycling and reusing method of waste synthetic liquid after MFI zeolite membrane reaction. The method comprises the following steps: collecting waste synthetic liquid after MFI zeolite membrane synthesis reaction, and removing possible large-particle impurities through simple physical separation means such as standing, centrifuging or filtering to obtain stable suspension rich in MFI crystals, and directly using the suspension as seed crystal liquid for next MFI membrane synthesis. According to the method, a complicated purification or retreatment process is not needed, and in-situ and all-component recovery of the waste synthetic liquid is realized. The method has the beneficial effects that the consumption of fresh seed crystals and chemical raw materials in the preparation process of the MFI film is greatly reduced, and the production cost is saved; meanwhile, the discharge of organic waste liquid is reduced, and the method is environment-friendly; the recycled seed crystal liquid is high in activity, when the seed crystal liquid is used for secondary synthesis, the prepared MFI membrane still has good continuity and separation performance, and an effective way is provided for achieving green, low-cost and sustainable manufacturing of the MFI membrane material.