58results about "Distillation" patented technology

This invention relates to certain porous hollow fiber membranes comprising certain PEDEK-PEEK copolymers, to a method for making said porous hollow fiber membranes, to composite membranes comprising a selective layer and their uses in the separation of gases or liquids.

The application discloses a preparation method of high-valence MOF crystal film for organic dehydration and purification. The preparation method is as follows: a porous gamma-Al2O3 carrier is placed in an acetic acid aqueous solution, a solvothermal reaction is carried out to obtain a gamma-AlOOH precursor layer, and then the precursor layer modified carrier is placed in an aqueous solution containing carboxylic acid ligands and hydrated nitrate, and is subjected to secondary growth. The application utilizes a solvothermal method to modify the carrier, pre-sprays a layer of gamma-AlOOH precursor on the surface of the porous gamma-Al2O3 carrier, and then obtains the high-valence crystal film through secondary growth. The prepared porous MOF film material has excellent stability and separation performance in an organic / water system, and is an ideal organic dehydration and purification material.

The application discloses a high-flux strong-hydrophobic composite membrane and a preparation method thereof, and belongs to the field of membrane separation and technology.The method comprises the following steps: formulating a casting solution and a preparation method, wherein the casting solution comprises a binder and a certain graphite-based carbon material; the casting solution is prepared into a film through a vacuum-assisted solvent evaporation method; and the volatilization of a solvent in the binder and the adhesion between the binder and the graphite-based carbon material are promoted at 50-100 DEG C, so that a high-flux strong-hydrophobic microporous composite membrane is obtained.The method is simple, fast and green, and lays a foundation for industrial application of the high-flux strong-hydrophobic microporous composite membrane.

The utility model discloses a kind of fatty acid isopropyl ester preparation equipment, including for containing esterification kettle containing fatty acid and isopropyl alcohol liquid phase mixture, circulating material guiding system, dehydration and reaction system again, circulating material guiding system includes circulating pump and venturi, circulating pump is communicated with esterification kettle inside, venturi has feed end and discharge end;Feed end is communicated with circulating pump, discharge end is communicated with esterification kettle inside;Dehydration and reaction system again includes gas dehydration device, and the dehydration input end of gas dehydration device is communicated with esterification kettle inside, and the dehydration output end of gas dehydration device is communicated with venturi;By the moisture and part isopropyl alcohol of gas phase state are dehydrated through gas dehydration device, make the gas phase isopropyl alcohol after dehydration under the negative pressure effect of venturi backflow to esterification kettle inside, i.

The application discloses a preparation method of a high-stability cellulose nanofluid film, and a product and application thereof, and belongs to the field of energy conversion and material science. The method comprises the following steps: adding modified cellulose into an ionic liquid to prepare a solution by heating; dropping and coating the solution onto the surface of a porous polymer film, and preparing a gel film by heating and vacuum treatment; and obtaining the nanofluid film after water soaking and drying of the gel film. The nanofluid film adopts an embedded structure, the cellulose layer is a small-pore structure, the porous polymer film is a large-pore structure, and the nanofluid film has etching and three-dimensional network channel structures. The preparation process is simple and the conditions are mild, the prepared film has excellent ion rapid selective transmission performance, acid-base stability and long-term operation stability, can efficiently convert salinity gradient energy into electric energy, and has a good application prospect in the field of salt-difference osmotic energy utilization.

This invention discloses a self-microporous polymer, a self-microporous ion exchange membrane, its preparation method, and its applications, belonging to the field of polymer materials technology. The polymer uses 1,3,5-tris(4-aminophenyl)benzene (TAPB), o-toluidine (DMBP), and dimethylformaldehyde as monomers. Utilizing the rigid, distorted, and non-densely stacked molecular structures of TAPB and DMBP, a polymer material with an inherent sub-nanometer microporous structure and its corresponding homogeneous ion exchange membrane are prepared. The formed self-microporous structure constructs continuous ion transport channels within the membrane, where the sub-nanometer-scale micropores impart a significant size sieving effect, thereby achieving selective separation of monovalent / polyvalent anions. Furthermore, by quaternizing the membrane material, fixed positively charged groups are introduced onto the polymer backbone. These positively charged groups generate significant electrostatic repulsion, enabling selective separation of monovalent / polyvalent cations, particularly suitable for the efficient separation of lithium and magnesium ions.

The application discloses a preparation method of MAF / ZIF crystal film for organic matter enrichment. The preparation method comprises the following steps: placing a porous gamma-Al2O3 carrier in an acetic acid aqueous solution, carrying out a solvothermal reaction to obtain a gamma-AlOOH precursor layer, and then sequentially immersing the carrier modified with the precursor layer in solutions of imidazole ligands and metal salts to obtain the MAF / ZIF crystal film through liquid phase epitaxy self-assembly. The carrier is modified by using a hydrothermal method, a layer of gamma-AlOOH precursor is pre-grown on the surface of the porous gamma-Al2O3 carrier, and then the MAF / ZIF crystal film is obtained through a layer-by-layer immersion method. The prepared MAF / ZIF film material has excellent stability and separation performance for an organic matter / water system, and is an ideal organic matter enrichment material.

The application belongs to the field of membrane separation technology, and particularly relates to a hydrophilic pervaporation membrane for separating ethanol-water azeotrope and a preparation method thereof. The method comprises the following steps: adding IU particles into a polyvinyl alcohol-chitosan blended solution, and obtaining the hydrophilic pervaporation membrane after cross-linking; and the mass percentage of the IU particles in the polyvinyl alcohol-chitosan blended solution is 20-30 wt%. The application introduces imidazole compound IU modified particles while constructing a polyvinyl alcohol-chitosan mixed matrix membrane, the particles can be well dissolved in the polyvinyl alcohol-chitosan mixed solution, the hydrophilic imidazole groups at both ends of the particles and the hydrophobic fatty chain structure in the middle can be closely arranged in the prepared membrane, so that water molecules can selectively pass through the channel between adjacent hydrophilic groups, thereby improving the separation performance of the membrane. The prepared hydrophilic pervaporation membrane has the advantages of high flux, good separation performance, high film-forming property, low cost, stable structure and performance, and the like, and is suitable for separating ethanol-water systems.

The present invention provides a membrane separation device suitable for inhibiting the hygienic state inside the membrane separation device from deteriorating. The membrane separation device is equipped with a spiral membrane element. The membrane element comprises: a center tube having through holes; and a membrane leaf wound around the center tube and including a pervaporation membrane for separating a fermentation broth containing a volatile organic compound into a penetrant and a retentate. During operation of the membrane separation device, the retentate is prevented from flowing into the space adjoining the outer peripheral surface of the membrane element.

This invention relates to a horizontally oriented ZIF-L composite membrane and its preparation method. The membrane comprises a polyacrylonitrile (PAN) base membrane and a separation layer composed of two-dimensional leaf-like ZIF-L material. The preparation method of this invention includes the following steps: (1) synthesizing ZIF-L material at room temperature; (2) preparing a continuously oriented ZIF-L layer on the PAN base membrane by in-situ seed growth; (3) performing a secondary growth treatment on the ZIF-L layer to obtain a complete separation layer. The innovations of this invention are: (1) using the in-situ seed growth method to achieve the oriented arrangement of ZIF-L crystals, overcoming the defect of random growth of ZIF-L in traditional methods; (2) optimizing the separation layer structure through a secondary growth process, significantly improving the selectivity of the membrane; (3) the introduction of ZIF-L to construct a highly efficient water molecule transport channel, realizing the hydrophilic modification of the membrane surface. The prepared pervaporation membrane exhibits excellent separation performance: the pure water flux can reach 4000 g·m³. ‑2 ·h ‑1 With a separation factor as high as 2100, this membrane exhibits excellent stability and antifouling properties. It shows great promise for applications in biofuel purification, solvent dehydration, and other fields.

This invention discloses a method for the etherification of 5-cyanodiol hydrochloride to citalopram bromate using a dehydration membrane. The method includes: adding 5-cyanodiol hydrochloride, toluene, and a strong acid resin catalyst to a round-bottom reaction flask equipped with a magnetic stirrer; placing a water separation membrane in the reaction flask; maintaining a high vacuum on the permeate side of the water separation membrane; and then heating the reaction on a magnetically stirred heater. In the toluene system, the water separation membrane removes the water generated in situ through vapor permeation, driving the reaction forward, breaking the thermodynamic equilibrium constraint, improving product yield and purity, and achieving coupling of reaction and separation. This invention uses a strong acid resin catalyst coupled with a water separation membrane, resulting in a simple reaction procedure and favorable reaction conditions; the catalyst is safe and stable, with a low risk factor, is a green catalyst, can be recycled, and is easily separated from the reaction liquid; the water separation membrane removes water in situ through vapor permeation, improving raw material conversion rate and product purity.

The application discloses application of high-performance metal organic framework films in membrane separation. The metal organic framework films are prepared by direct growth and seed-induced growth through an interfacial polymerization method independently developed by the application, and the surface morphology of the metal organic framework films is compact, so that the metal organic framework films can play a role in the fields of gas separation and liquid phase separation, especially show excellent performance in a hydrogen / carbon dioxide separation system, and an equal-component separation coefficient reaches about 350. Meanwhile, the metal organic framework films have the characteristics of simple synthesis operation and low cost, and are beneficial to large-scale industrial production.

The present invention provides a membrane separation system that makes it possible, by a process using a pervaporation membrane, to obtain a non-permeated fluid sufficiently suitable to be reused. A membrane separation system 100 of the present invention includes a membrane separation device 10. The membrane separation device 10 has a pervaporation membrane 11. The pervaporation membrane 11 separates a fermented liquid S containing a volatile organic compound C and a microorganism that generates the organic compound C into a permeated fluid and a non-permeated fluid. The membrane separation system 100 adjusts a temperature of the membrane separation device 10 so that an absolute value of a difference between a temperature T1 (°C) of the fermented liquid S to be supplied to the membrane separation device 10 and a temperature T2 (°C) of the non-permeated fluid discharged from the membrane separation device 10 is less than 10°C.

This invention relates to a method and system for water isotope pervaporation separation based on a two-dimensional material membrane, belonging to the field of membrane separation technology. The method combines pervaporation with a two-dimensional material membrane, which is either a two-dimensional nanoporous membrane or a mixed matrix membrane. It utilizes the sub-nanometer interlayer channels of the nanoporous membrane or the kinetic quantum sieving effect of the polymer chain micropores in the mixed matrix membrane, as well as the chemical affinity quantum sieving effect of the binding sites on the surface of the two-dimensional material, coupled with pervaporation to achieve water isotope separation. Under the action of quantum sieving, lighter isotopes transport faster than heavier isotopes; particles are in a vibrating state within the pores; lighter isotopes have higher zero-point energies and more intense vibrations, making them easier to break free from adsorption sites; heavier isotopes have lower zero-point energies and are more easily adsorbed, thus achieving separation. This scheme, by leveraging intramembrane quantum sieving, synergistically combining the phase transition of pervaporation with the transmembrane chemical potential gradient, can achieve low-energy and high-efficiency separation of water isotopes, promoting applications in membrane separation and the field of two-dimensional materials.

This application relates to a self-circulating thin-film distillation apparatus and method. The apparatus includes a main body, an inner tube, a heating medium sleeve assembly, and a bowl-shaped end cap. The inner tube is disposed within the cylinder to form a material reflux annular gap, and its interior contains a heating tube bundle with staggered support baffles. The bowl-shaped end cap is centrally closed, with its concave surface facing the opening at the top of the inner tube. Driven by the lift force of the stripping gas, the material to be distilled climbs along the outer wall of the heating tube bundle, is heated, and is guided by the baffles to rise in an S-shaped path. After the mixed fluid impacts the bowl-shaped end cap, the gas phase enters the separation chamber through the edge flow gap and is discharged, while the liquid phase falls into the reflux annular gap through the flow gap and descends to the bottom by gravity, achieving self-circulation without power. This invention eliminates mechanical rotating parts and an external circulation pump, solves the problems of dynamic sealing and high-viscosity material circulation under high temperature and high vacuum conditions, and improves heat transfer efficiency and effectively prevents coking on the heating surface by utilizing a geometric cooperative structure.

This technology provides a highly reliable method for separating water from a mixed liquid. [Solution] The organic solvent recovery apparatus comprises a first dewaterer 60, a second dewaterer 70, a switching unit 50, and a control unit. The first dewaterer 60 includes a first separation membrane 62c, and the second dewaterer 70 includes a second separation membrane 72c. The switching unit 50 switches between a first state in which the solvent concentration of the mixture of organic solvent and water is increased in the first dewaterer 60, and a second state in which the mixture is supplied to the second dewaterer 70. The control unit causes the switching unit 50 to select the first state when the solvent concentration of the mixture is a first value equal to or greater than the lower limit of the concentration of the first separation membrane 62c, and causes the switching unit 50 to select the second state when the solvent concentration of the mixture is a second value less than the lower limit of the concentration. The lower limit of the solvent concentration range applicable to the second separation membrane 72c is less than the lower limit of the concentration range applicable to the first separation membrane 62c, and the separation constant of the first separation membrane 62c is higher than the separation constant of the second separation membrane 72c.

This invention provides a solar membrane distillation device, comprising: a brine tank having a receiving cavity for containing brine and an outlet and an inlet connected to the receiving cavity; a tubular photothermal conversion membrane, one end of which is connected to the outlet and the other end of which is connected to the inlet, the outer surface of which is coated with a heat-absorbing material and the inner surface of which is coated with a hydrophobic material; and a collection unit including a freshwater tank and a transparent cover covering the freshwater tank, the freshwater tank having a freshwater storage cavity for containing freshwater, the inner cavity of which is connected to the freshwater storage cavity, and the tubular photothermal conversion membrane disposed inside the transparent cover. The technical solution provided by this application can solve the problem in related technologies where membrane fouling easily occurs during brine treatment, thus affecting the brine separation efficiency of the photothermal conversion membrane.

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 method for synthesizing NaA molecular sieve membrane by using wet gel layer crystallization. The method comprises the following steps: firstly, preparing a wet seed carrier, then, without drying treatment, the wet seed carrier is directly soaked in a gel solution to form a wet gel layer on the surface of the wet seed carrier, and after being taken out, the wet seed carrier is put into a reaction kettle to be heated and crystallized to synthesize high-performance NaA molecular sieve membrane. The preparation process is simple, the utilization rate of the gel solution is high, the preparation reproducibility is good, the prepared NaA molecular sieve membrane has high separation performance, can be applied to large-scale application, and has important industrial application value.

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.

The application discloses a pervaporation composite membrane and a preparation method and application thereof, and belongs to the technical field of membrane separation. The pervaporation composite membrane comprises a porous substrate, an intermediate film layer and a separation film layer which are arranged in sequence. The average pore diameter of the porous substrate is greater than or equal to 250 nm. The average pore diameter and porosity of the intermediate film layer are both smaller than the average pore diameter and porosity of the porous substrate, and the intermediate film layer has an organic affinity characteristic. The separation film layer has a hydrophobic characteristic and an organic selective permeation characteristic. The intermediate film layer is beneficial to improving the problems of pore penetration in a solid-liquid interface preparation process, is not prone to spreading, and the thickness of the separation film layer is uncontrollable, and can ensure the defect-free preparation of the separation film layer, and is beneficial to improving the permeability of the pervaporation composite membrane to organic matters.

This invention belongs to the field of chemical engineering technology, specifically relating to a method for the recycling of photoresist stripping solution waste. The invention first uses specially modified magnetic nanoparticles to demulsify, reduce viscosity, and remove impurities from the waste solution. Then, a zeolite film with a zirconium-tannic acid-polyethyleneimine metal-organic coordination network layer on its surface is used for pervaporation dehydration. Finally, adsorption, polishing, and recombination are performed, achieving the recycling of photoresist stripping solution waste. The resulting waste solution achieves a water removal rate >99.9% and an effective component recovery rate >99.5%.

This invention relates to an integrated system for demineralizing and / or purifying water and simultaneously generating hydrogen, comprising a heat dissipation element thermally connected to the system for demineralizing and / or purifying water, which is hydraulically connected to an electrochemical unit for generating hydrogen. The system for demineralizing and / or purifying water operates on the principle of thermal distillation via a membrane and includes at least two units, each unit comprising a first chamber and a second chamber. Wastewater to be demineralized and / or purified flows under pressure in the first chamber, and demineralized and / or purified water flows under pressure in the second chamber in the opposite direction to the flow of the wastewater. The two chambers are separated by a preferably microporous hydrophobic membrane. The at least two units are placed in a thermally series and hydraulically parallel manner, with continuous flow, wherein each unit is hydraulically connected. The system includes a wastewater source and a demineralized and / or purified water source. Specifically, each first chamber includes an inlet hydraulically connected to the wastewater source for introducing wastewater into the first chamber, and each second chamber includes an inlet hydraulically connected to the demineralized and / or purified water source for introducing demineralized and / or purified water into the second chamber. The first chamber also includes an outlet for discharging wastewater from the first chamber, and the second chamber also includes an outlet for discharging demineralized and / or purified water from the second chamber. Within each unit, the first chamber and the second chamber are spatially opposite each other, thus forming a first region and a second region spatially opposite to the first region in the unit. In the first region, the outlet of the second chamber is located near the inlet of the first chamber, and in the second region, the inlet of the second chamber is located near the outlet of the first chamber.

The present application relates to the preparation of composite membranes and the separation of methanol dehydration technology, aiming at providing a preparation method of zinc ion hydrophilic metal organic framework mixed polyvinyl alcohol composite membrane. Including: Zn(NO3)2.6H2O, PVP and 2-cyano imidazole are reacted, and the reaction product is sequentially subjected to amidation modification and hydroxyl modification reaction to obtain a zinc ion hydrophilic metal organic framework, which has a microstructure of being externally modified by hydroxyl and amide groups and internally hollow; polyether sulfone ultrafiltration membrane is used as a support membrane, polyvinyl alcohol solution containing the organic framework is dried on the upper part of the support membrane to form a polyvinyl alcohol mixed matrix membrane, and the composite membrane is formed by cross-linking at the contact interface. The present application can preferentially adsorb water molecules and improve the solubility of water in the membrane; water molecules can be selectively passed through, effectively improving the permeability and selectivity of the polyvinyl alcohol membrane to water, and high-purity methanol products can be obtained after cyclic dehydration; by adding MOF fillers and interfacial cross-linking, the present application can maintain good mechanical, chemical and thermal stability.

The present invention relates to a hollow fiber membrane cartridge, a humidifier for a fuel cell, and a fuel cell including the same, which have excellent heat resistance and hydrolysis resistance, a heat distortion temperature of 120°C or higher, and a moisture absorption rate of 1% or less, so as to minimize deterioration of mechanical properties and dimensional deformation that may occur during use of the fuel cell and increase the durability life of the product.

The present application relates to the technical field of membrane separation materials, in particular to a composite molecular sieve membrane and a preparation method and application thereof. The composite molecular sieve membrane comprises: a porous silicon carbide ceramic support; a silicon carbide-based gradient transition layer formed on the surface of the porous silicon carbide ceramic support; and a zeolite molecular sieve separation layer formed on the silicon carbide-based gradient transition layer. The present application solves the problems of insufficient chemical stability in a strong acid environment, low interface bonding strength, poor long-term operation stability and the like of the existing membrane materials.