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High-water-flux forward-osmosis composite membrane and preparation method thereof
ActiveCN103977718AHigh selectivityImprove hydrophilicitySemi-permeable membranesConcentration polarizationPolysulfone membrane
The invention relates to a high-water-flux forward-osmosis composite membrane and a preparation method thereof. The forward-osmosis composite membrane is a polysulfone-sulfonated polysulfone-inorganic filler blended / polyamide composite membrane. A traditional osmosis membrane is generally applied to a reverse-osmosis system, and if the traditional osmosis membrane is used in a forward-osmosis process, the water flux of osmosis is far lower than a theoretical value since the traditional osmosis composite membrane is large in thickness, the hydrophilicity of a supporting layer of a polyamide layer is poor so as to cause serious inner concentration polarization. The preparation method comprises the following steps: blending a polymer with a modifier to form film casting liquid; after scraping or leveling, performing non-solvent coagulating bath with water; by a phase-inversion method, preparing a polysulfone ultrafiltration membrane with good hydrophilicity, high porosity, uniform surface pore structure and narrow pore diameter distribution; and in a clean environment and at room temperature, airing the polysulfone membrane till the surface is dry, and growing a polyamide active layer on the surface of the polysulfone membrane by an interfacial polymerization method, thereby obtaining the forward-osmosis composite membrane with good hydrophilicity, high porosity, low thickness and high mechanical strength. The high-water-flux forward-osmosis composite membrane disclosed by the invention has the advantages that not only the osmosis flux is high, but also the reverse leakage of an extraction medium is low, and the selective permeability is good.
Owner:UNIV OF SCI & TECH OF CHINA
Method for preparing high-throughput covalent organic framework nano-filtration membrane on basis of interfacial polymerization
ActiveCN108889139AGood chemical stabilityHigh permeation fluxSemi-permeable membranesFiltration membraneBinding force
The invention provides a method for effectively preparing a high-throughput covalent organic framework (COFs) nano-filtration membrane on the basis of interfacial polymerization. The method comprisesthe following steps: sequentially applying an aqueous phase solution dissolved with polyamine monomers and an organic phase solution dissolved with polyaldehyde / polyketones monomers to the surface ofa porous carrier to carry out interfacial polymerization; diffusing the polyamine monomers in the aqueous phase solution saturated porous carrier to a water / oil interface to carry out schiff base reaction with polyaldehyde / polyketones in an organic phase, and gradually forming a covalent organic framework separating layer on the surface of the porous carrier by a conformal growth manner; and thencarrying out heat treatment on a composite membrane consisting of the separating layer and the porous carrier to enhance the binding force of the covalent organic framework separating layer and the porous carrier, and promoting crystallization and conversion of the covalent organic framework. The method not only is simple and convenient to operate and short in technological process, but also is well compatible with an existing process, thus, continuous product becomes possible, and the prepared composite membrane has high flux.
Owner:NANJING UNIV OF TECH
Preparation method of hollow flat plate structure type ceramic filter membrane element
ActiveCN103623711ALower sintering temperatureSmall filter resistanceSemi-permeable membranesAluminium hydroxideChemical separation
Owner:雅安沃克林环保科技有限公司
Method of preparing antibacterial anti-pollution ultrafiltration membrane by adopting silver-loaded nano composite material
ActiveCN105195025AImprove hydrophilicityImprove antibacterial propertiesBiocideSemi-permeable membranesUltrafiltrationPollution
The invention discloses a method of preparing an antibacterial anti-pollution ultrafiltration membrane by adopting a silver-loaded nano composite material. The method comprises the following steps: preparing a nano material water dispersion solution, adding trihydroxymethyl aminomethane and dopamine hydrochloride, stirring and reacting for 2 to 12 hours, centrifugally washing, then drying to obtain a polydopamine-modified nano material; preparing a mixed solution containing the polydopamine-modified nano material, a silver-ammonium solution, a stabilizer and water, stirring for 2 to 12 hours, centrifugally washing, and then drying to obtain the silver-loaded nano composite material; dispersing the silver-loaded nano composite material in an organic solvent, adding a membrane material, stirring, completely dissolving the membrane material, and standing to obtain a membrane casting solution; and scraping the membrane casting solution into a flat membrane by utilizing a flat membrane scraping machine, immersing in a coagulating bath, and carrying out a phase conversion to obtain the antibacterial anti-pollution ultrafiltration membrane. The ultrafiltration membrane has good hydrophilia, durable antibacterial performance and excellent anti-pollution performance, has good antibacterial and sterilization effect for colibacillus, bacillus subtilis and the like; moreover, the silver nano particles stably exist in the antibacterial anti-pollution ultrafiltration membrane.
Owner:TIANJIN UNIV
Asymmetrically-structural ceramic ultrafiltration membrane and preparation method thereof
ActiveCN101791524AHigh porosityUniform pore sizeSemi-permeable membranesUltrafiltrationDefoaming Agents
The invention relates to an asymmetrically-structural ceramic ultrafiltration membrane and a preparation method thereof, wherein the preparation method thereof comprises the steps: dispersing one-dimensional fibrous material in sol and sufficiently mixing the material with the gel; by adding deionized water, controlling the weight ratio of gel particle to fiber in membrane preparing solution in a range from 0.01 to 0.4, adjusting pH value of the solution, adding dispersing agent, thickening agent and defoaming agent to formulate the membrane preparing solution, coating membrane on a porous support body and drying the porous support body to form a transition layer; coating the gel-containing membrane preparing solution on the surface of the transition layer, air-drying, oven-drying and roasting the wet membrane, and naturally cooling the membrane to result in the asymmetrically-structural ceramic ultrafiltration membrane. Since the transition layer is composed of fiber and sintering is promoted through the gel, resistance of the transition layer is advantageously lessened and interior combination strength of the transition layer is enhanced; the fiber-constructed transition layer divides large pores into small pores to provide larger total porosity and flowing pore channel, thus high permeation flux is maintained while high selectivity is obtained.
Owner:NANJING UNIV OF TECH
Preparation method for polyether sulfone/graphene oxide composite ultrafiltration membrane
InactiveCN102614788AHigh permeate fluxGood hydrophilicitySemi-permeable membranesUltrafiltrationSulfone
The invention discloses a preparation method for a polyether sulfone / graphene oxide composite ultrafiltration membrane. The preparation method comprises the following steps of ultrasonically dispersing the graphene oxide into an organic solvent to form uniform and stable dispersing liquid; adding polyether sulfone and additive into the dispersing liquid; stirring, dissolving, standing and defoaming to form uniform and stable casting membrane liquid; pouring the casting membrane liquid on a glass plate; scraping the membrane; and immersing into coagulating bath at room temperature to obtain the polyether sulfone / graphene oxide composite ultrafiltration membrane after the membrane is removed automatically, wherein the casting membrane liquid comprises the following components as per mass percentage concentration: 15 to 21 percent of polyether sulfone, 1 to 2 percent of pore-forming agent and 0.5 to 4.0 percent of graphene oxide. The polyether sulfone / graphene oxide composite ultrafiltration membrane has high hydrophilcity, high porosity, static resistance, elasticity and the like and improves the flux of pure water, retention rate, pollution resistance, mechanical property and the like.
Owner:QINGDAO UNIV
Plant polyphenol modified polymer membrane as well as preparation method and application thereof
ActiveCN107670513AAvoid performance damageAvoid pollutionMembranesSemi-permeable membranesHydrophilic coatingPolymer science
The present invention discloses a plant polyphenol modified polymer membrane as well as a preparation method and application thereof, in particular relates to the field of modified polymer membranes with anti-fouling properties. In the prior art, due to low surface energy of the polymer membrane, the polymer membrane is susceptible to contamination with proteins, oils and the like and causes a series of temporary or permanent pollution problems. The polymer membrane provided by the invention utilizes the super-strong adhesive ability of plant polyphenols and the coordination of polyphenols andmetal ions to build a hydrophilic coating on the surface of a hydrophobic polymer membrane. The polymer membrane provided by the invention has the advantages of simplicity, high efficiency, mild reaction condition and strong practicability. The controllable hydrophilic modification of a hydrophobic polymer can be realized by changing the conditions of the dip-coating time, the concentration of aplant polyphenol mixed solution, the pH, the temperature and the like, and a high permeation flux can be maintained in the course of cross-flow continuous work, so that the polymer membrane has a verygood application prospect in the field of water treatment. The invention also opens up an effective way, which is simple and easy to operate and has strong universality, for modification of polymer membranes under mild conditions.
Owner:TIANJIN POLYTECHNIC UNIV
Preparation method for polydopamine-modified polyamide composite forward osmosis membrane
InactiveCN105169970AIncrease water fluxTightly boundSemi-permeable membranesGeneral water supply conservationChemistryPolyamide
The invention relates to a preparation method for a polydopamine-modified polyamide composite forward osmosis membrane. The preparation method comprises the following steps: (1) a supporting layer is prepared; (2) the surface of the supporting layer is modified by polydopamine coating; (3) a polyamide separation layer is prepared on the surface of the modified supporting layer, and thereby the polydopamine-modified polyamide composite forward osmosis membrane is obtained. The polydopamine-modified polyamide composite forward osmosis membrane prepared by the preparation method has the advantages of hydrophilcity, large pure water permeation flux and small reverse salt diffusion flux, and is applicable to the field of water treatment such as sea water desalination.
Owner:WUHAN UNIV
Preparation method of layer-by-layer self-assembly metal-organic framework composite film
ActiveCN106178999AHigh permeation fluxSemi-permeable membranesMembranesComposite filmMetal-organic framework
The invention relates to a preparation method of a layer-by-layer self-assembly metal-organic framework composite film. Polyethyleneimine (PEI) with positive charges, a methanol solution containing ZIF-8 and polyacrylic acid (PAA) with negative charges deposit on the surface of a polyether sulfone (PES) film layer by layer, ZIF-8 is wrapped in PEI and PAA through the electrostatic repulsion effect of the opposite charges, and a layer structure is formed on the surface of the PES film. By preparing the methanol solution containing ZIF-8, through the layer-by-layer self-assembly technology, ZIF-8 is successfully loaded on the surface of the PES film, the loading capacity of the PES film is maximized, and the composite film material with high permeation flux under no permselectivity compromise is successfully prepared.
Owner:SHANDONG UNIV
Ceramic flat membrane supporting body and production method thereof
ActiveCN103381338AImprove filtration efficiencyGuaranteed mechanical strengthSemi-permeable membranesSurface layerSlurry
The invention discloses a ceramic flat membrane supporting body and a production method thereof. The ceramic flat membrane supporting body is formed by two layers of flat membranes, the left lateral wall, the right lateral wall and at least a supporting column; the two layers of flat membranes, the left lateral wall and the right lateral wall form into a flat-pipe-shaped structure; the supporting column is arranged between the two layers of flat membranes; the flat membranes which are in asymmetric structures comprise surface layers of sponge hole structures and internal layers of finger-shaped hole structures; separation selectivity, permeation flux and mechanical strength of the flat membranes are high. The production method of the ceramic flat membrane supporting body comprises preparing slurry, producing dies through a phase inversion method, forming through a die pressing method and sintering. The production technology is easy and flexible, the costs are low, the dies are cheap, the replacing is convenient, a plurality of assemblies in different sizes can be formed at one time, and the production efficiency is high.
Owner:GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
Pervaporation separation membrane and preparation method thereof
InactiveCN106110910AImprove hydrophilicityEasy to separateSemi-permeable membranesMembranesPervaporationEthyl ester
The invention discloses a pervaporation separation membrane and a preparation method thereof. The pervaporation separation membrane is prepared by stably polymerizing dopa or dopamine on the surface of a base membrane, and performing grafting and cross-linking. According to the pervaporation separation membrane and the preparation method thereof, a polydopa or polydopamine composite layer which can be firmly combined with the base membrane on the basis of a biological bonding principle is obtained; the composite layer is directly cross-linked with hydroxyls in a long-chain molecule, so that the pervaporation separation membrane which is high in hydrophility, permeation flux, separation performance and membrane stability is prepared. The preparation process is simple and convenient; raw materials are easy to obtain; the condition is mild; the prepared pervaporation membrane is used for separating ethyl acetate from water, and has relatively high permeation flux and membrane stability.
Owner:JIANGSU SOPO GRP +2
Low-pressure high-flux chlorine-containing polymer nanofiltration membrane with stable separation layer and preparation method thereof
The invention discloses a low-pressure high-flux chlorine-containing polymer nanofiltration membrane with a stable separation layer and a preparation method thereof. The nanofiltration membrane comprises a macroporous support layer and a dense function layer, wherein the macroporous support layer and the dense function layer are connected with each other by virtue of a C-N bond; the dense function layer is made of a positive, charged or amphoteric ionic cross-linking polyamine compound; the macroporous support layer is made of a chlorine-containing polymer. The preparation method of the filtration membrane comprises the following steps: firstly coating the surface of a chlorine-containing polymer ultrafiltration membrane with the polyamine compound, carrying out heat treatment, washing the ultrafiltration membrane, then dipping the ultrafiltration membrane in a mixed solution of a cross-linking agent and a charge reagent and carrying out heat treatment again. The membrane flux of the prepared polymer nanofiltration membrane can reach 60L / m<2>.h under the pressure of 0.3MPa; the retention rate on micromolecule dye and high-valence inorganic salt can reach 90%; the chlorine-containing polymer nanofiltration membrane can be in a flat fiber ultrafiltration membrane form or a hollow fiber ultrafiltration membrane form, and has good practical prospect.
Owner:ZHEJIANG UNIV
Composite semipermeable membrane and process for producing the same
InactiveUS20040222146A1Raise the pHPermeation flux of to decreaseSemi-permeable membranesWater/sewage treatment bu osmosis/dialysisAmount of substanceOrganic acid
A composite semipermeable membrane which combines the high ability to reject salts and a high permeation flux and is especially excellent in the ability to reject uncharged substances, and a process for producing the semipermeable membrane are disclosed. The process comprises forming on a surface of a porous supporting film a thin film comprising a polyamide resin obtained by reacting a polyfunctional amine ingredient with a polyfunctional acid ingredient in the presence of at least an alkali metal hydroxide and an organic acid.
Owner:NITTO DENKO CORP
Combined honeycomb ceramic membrane filtering element
The invention discloses a combined honeycomb ceramic membrane filtering element comprising a honeycomb ceramic support body, a filter duct arranged in the support body, a supporting member and a fastener, wherein the honeycomb ceramic support body is in a flat plate shape; the axis of the filter duct and the board of the honeycomb ceramic support body are parallel and are arranged in the honeycomb ceramic support body in parallel to form two or more than two honeycomb ceramic monomers which are overlaid and combined at intervals; the fastener is arranged on the periphery of the combined honeycomb ceramic monomers; and the supporting member is respectively positioned between adjacent honeycomb ceramic monomers and between the fastener and the honeycomb ceramic monomer and is positioned on the port of the filter duct. The combined honeycomb ceramic membrane filtering element has the advantages of higher penetration flux and unit volume membrane area and simple configuration and preparation technology, and ensures that the osmotic resistance is effectively reduced, simultaneously the yield rate of the honeycomb ceramic membrane is greatly improved and the ceramic membrane cost is lowered.
Owner:重庆兀盾纳米科技有限公司
Preparation method of amino-modified graphene oxide composite positive permeable film
InactiveCN103861472AHigh mechanical strengthGood chemical stabilitySemi-permeable membranesDiamineDimethyl formamide
The invention provides a preparation method of an amino-modified graphene oxide composite positive permeable film. The method is characterized by comprising the following specific steps: mixing graphene oxide, dimethyl formamide, organic amine and dicyclohexyl carbimide, and performing ultrasonic treatment; reacting for 40-50 hours at the temperature of 100-150 DEG C; adding absolute ethyl alcohol, and standing and filtering to obtain a precipitate; washing and drying the precipitate to obtain amino-modified graphene oxide; mixing the amino-modified graphene oxide with a solvent, performing ultrasonic treatment, and adding an additive and a film formation polymer into a mixed solution to prepare a casting film solution; de-foaming to prepare a base film through a phase inversion method, and immersing the base film in pure water for later use; and pouring a metaphenylene diamine solution and trimesoyl chloride to the surface of the base film, performing a contact reaction, washing the surface of the film with an organic solvent, and drying the film to obtain the amino-modified graphene oxide composite positive permeable film. The amino-modified graphene oxide composite positive permeable film is high in mechanical strength, high in chemical stability, large in permeation flux of the pure water, and high in salt rejection rate.
Owner:DONGHUA UNIV
Preparation method of ceramic microfiltration membrane by using attapulgite nano fibers as separating layer
ActiveCN102179184ALarge total porosityHigh selectivitySemi-permeable membranesFully developedNanofiber
The invention discloses a preparation method of a ceramic microfiltration membrane by using attapulgite nano fibers as a separating layer, which is characterized by comprising the steps of: A, dispersing the attapulgite nano fibers in deionized water, adding a dispersing agent, a thickening agent and a defoaming agent to prepare a membrane solution; B, coating a membrane on a porous support body,and airing the wet membrane and drying; and C, roasting at a temperature of 400-800 DEG C for 1-6h, and naturally cooling to obtain a dual-layer ceramic microfiltration membrane. A separation layer of the ceramic microfiltration membrane consists of the attapulgite nano fibers. When a sieve mesh structure is formed, in the attapulgite nano fibers, macropores are separated into micropores to form communicated pore canals, thus the special nano fiber structure of the attapulgite is fully developed, larger total porosity and circulating pores are provided, and high penetration flux is maintainedwhile high selectivity is obtained.
Owner:HUAIYIN TEACHERS COLLEGE
Method for producing hydrogen through coupled catalytic reforming and membrane separation reaction, and device thereof
InactiveCN101837955AAvoid depositionEasy to separateHydrogen separationCatalytic reformingSteam reforming
The invention belongs to the technical field of chemical equipment, and relates to a method for producing hydrogen through coupled catalytic reforming and membrane separation reaction, and a device thereof, in particular to a method for producing hydrogen through fluidized-bed methane steam reforming, and a device thereof, which apply to the fields of petroleum, chemical industry and fuel cells. A main structure comprises a feed gas inlet, a pre-distribution chamber, a gas distribution plate, a palladium membrane component, a catalyst bed layer, a sampling port, a fluidized-bed reaction-zone bed body, a metal connection tube, a heating system, a hydrogen duct, an expansion section, a super pure hydrogen outlet, a vacuum pump, a backpressure valve, a liquid rotor flow meter, a water pump, an exhaust gas outlet, a heat exchanger, a gas rotor flow meter, a gas pump and a preheater, wherein the components are in gas-liquid communication and organic coordination to form a methane steam reforming hydrogen production device or reactor with a hydrogen selective membrane fluidized bed, and the top of the fluidized-bed reaction-zone bed body is sealed by adopting a cover-type structure. The invention has the advantages of simple process, low investment in equipment, good membrane separation performance and high hydrogen production rate.
Owner:QINGDAO UNIV OF SCI & TECH
Graphene oxide/Pebax hollow fiber membrane and preparation method thereof
ActiveCN105396432AHigh permeation fluxEasy to operateMembranesSemi-permeable membranesHollow fiber membraneMixed gas
The invention belongs to the technical field of membrane preparation, and mainly relates to a graphene oxide / Pebax hollow fiber membrane and a preparation method thereof. The preparation method comprises the following steps: pretreating a basement membrane until micropores of the basement membrane are filled with water, and then coating a transition layer and a separating layer on the basement membrane, thereby obtaining the graphene oxide / Pebax hollow fiber membrane, wherein the basement membrane is the hollow fiber membrane. The method is simple to operate; is used for creatively applying GO to the field of gas separation, has a good separation effect to the CO2 / N2 mixed gas, enhances the CO2 permeation flux greatly, and meanwhile keeps the stable separation factor. As a novel gas separation membrane, the graphene oxide / Pebax hollow fiber membrane is expected to be widely applied to the actual industrial field.
Owner:ZHENGZHOU UNIV
Microwave apparatus and method for synthesizing molecular sieve film
ActiveCN101397142AShort synthesis timeHigh permeation fluxSemi-permeable membranesCrystalline aluminosilicate zeolitesMolecular sieveControl system
The invention provides a microwave device for synthesizing molecular sieve membrane and a method thereof; wherein, the device comprises a microwave power source 1, a microwave transmission system 2, a microwave reactor 3 and a control system 4; the microwave power source 1 controlled by the control system 4 enters the microwave reactor 3 by the microwave transmission system 2; wherein, the microwave reactor 3 consists of a microwave chamber 5, a reaction kettle 6 and a rotation pallet 7; the reaction kettle 6 is arranged in the microwave chamber 5 and on the rotation pallet 7; the technical proposal aims at the industrial amplification synthesis of the molecular sieve membrane and provides the device for the synthesis of the molecular sieve membrane microwave and the method thereof. The invention is used for achieving the object of quick synthesis of molecular sieve membrane (such as molecular sieve membrane supported by long pipe-shaped carrier) in large area, shortens the synthesis time and improves the permeation flux.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Covalent organic framework membrane with high rejection rate as well as raw material composition and preparation method thereof
ActiveCN112808006AHigh permeation fluxImprove long-term stabilitySemi-permeable membranesMembranesPolymer scienceOrganic solvent
The invention relates to a covalent organic framework membrane with high rejection rate as well as raw material composition and preparation method thereof. The raw material composition comprises a water-phase monomer solution, an organic-phase monomer solution and a modified solution, the water-phase monomer solution comprises 0.01-2% by mass of a water-phase monomer, an acid regulator and the balance of water, wherein the water-phase monomer is selected from one or more of diamine or polyamine; the organic phase monomer solution comprises 0.01-2% by mass of an organic phase monomer and the balance of an organic solvent, and the organic phase monomer is selected from one or more of dialdehyde or polyaldehyde; the modifying solution comprises a modifying agent with the mass fraction of 0.01-5%, an oxidizing agent with the mass fraction of 0.01-3%, an acid-base regulator and the balance of water, wherein the modifying agent is selected from one or more of arylamine, heterocyclic amine or polyphenol. The covalent organic framework membrane provided by the invention improves the interception performance on small molecules, and has large permeation flux and good long-term operation stability.
Owner:TIANJIN UNIV
Preparation method of polyvinyl chitosan mixed film
InactiveCN101007243AHigh mechanical strengthGood chemical stabilitySemi-permeable membranesAcetic acidMethyl carbonate
The invention involves a preparation method used for separating the polyvinyl alcohol / chitosan mixing film of methanol / dimethyl carbonate, the preparation process is as follows: 1) dissolving the polyvinyl alcohol with the deionized water as solvent in 80 ~ 100 degree C and gaining uniform casting film solution which polyvinyl alcohol concentration is 5wt%; 2) dissolving the chitosan with the glacial acetic acid and deionized water as solvent in 20-40DEG C and gaining uniform casting film solution which chitosan concentration is 1wt%; 3) according certain radio mixing the ratio of PVA and chitosan solution uniformly and debubbling; 4) making film on the glass plate with casting method; 5) thermal treating the film 2~4 hours in 120 ~ 150 degree C. Compared with traditional separation methods, the method has some characteristics such as high one-time separation degree, simple precess, low energy consumption and pollution-free.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Metal organic compound filled cross-linked polysiloxane pervaporation membrane and preparation method thereof
InactiveCN102489190AIncrease the degree of cross-linkingGood film formingSemi-permeable membranesPrepolymerSolvent
The invention relates to a metal organic compound filled cross-linked polysiloxane pervaporation membrane and a preparation method thereof, and belongs to the field of membrane separation. The method comprises the following steps of: mixing a cross-linking agent, a catalyst, linear polysiloxane and a solvent, reacting to generate prepolymer, adding a metal organic compound, and performing cross-linking reaction to obtain a membrane casting solution; and coating the membrane casting solution on a macromolecular porous bottom membrane, drying, and heating to obtain a product, namely the metal organic compound filled cross-linked polysiloxane pervaporation membrane. The metal organic compound filled cross-linked polysiloxane pervaporation membrane prepared by the method has the characteristics of high permeation flux, good separation effect, high strength, stable structure and the like, is suitable for removing low-concentration organic compounds from water, and is particularly suitable for separating low molecular alcohol from a fermentation solution.
Owner:JIANGNAN UNIV
Preparation method for temperature sensitive response type intelligent ceramic composite membrane and product
InactiveCN101537316AHigh mechanical strengthImprove stabilitySemi-permeable membranesCeramic compositeFunctional monomer
The invention discloses a preparation method for a temperature sensitive response type intelligent ceramic composite membrane and a product. The product is obtained by chemical graft copolymerization of N-isopropyl acrylamide on the surface of a ceramic membrane. The invention takes the ceramic membrane as a basement membrane, takes the N-isopropyl acrylamide as a functional monomer, and adopts a method of chemical graft to prepare the temperature sensitive response type intelligent ceramic composite membrane. The prepared intelligent ceramic composite membrane can overcome the disadvantage of low mechanical strength of an intelligent membrane prepared taking an organic membrane as the basement membrane, has favorable chemical stability, long service life and the environmental sensitivity of a graft monomer, and is easy to disinfect and clean.
Owner:HUAIYIN TEACHERS COLLEGE
Al2O3-SiO2 ceramic membrane and preparation method thereof
InactiveCN102512977AUniform pore sizeMiniaturizationSemi-permeable membranesPolyvinyl acetateNano sio2
The invention discloses a Al2O3-SiO2 ceramic membrane which comprises a support body and a separation layer and is characterized in that the separation layer is prepared by coating a membrane making solution comprising nano SiO2, PVA (polyvinyl acetate), glycerol and water on the inner surface of the support body by adopting a melting-sol-gel process. The invention also discloses a preparation method of the Al2O3-SiO2 ceramic membrane, and the method comprises the following steps of: preparing the nano Al2O3 support body by adopting a blended particle sintering process; and coating the membrane making solution comprising the nano SiO2, the PVA, the glycerol and the like on the inner surface of the support body by adopting the melting-sol-gel process to form the Al2O3-SiO2 ceramic membrane. By adopting the technical scheme, the Al2O3-SiO2 ceramic membrane has the characteristics of low cost, simpleness and easiness for acquisition, increased membrane flux, high mechanical strength, pollution resistance, uniform membrane aperture, thin membrane wall, large permeation flux, raw material saving, easy realization of miniaturization and simplified structure of separation equipment, and the like.
Owner:XIAMEN LEEBAM MEMBRANE TECH
Preparation method of solvent-resistant compound nanofiltration membrane
ActiveCN103285741ALower surface energyImprove anti-pollution propertiesSemi-permeable membranesAlcoholPolypyrrole
The invention discloses a preparation method of a solvent-resistant compound nanofiltration membrane and relates to a preparation method of the membrane. The invention aims at solving the problem of superlow solvent permeation flux caused by good compatibility between an alcohol solvent and the nanofiltration membrane prepared by an existing method. The preparation method comprises the following steps of: (1) preparing an ultrafiltration base membrane; (2) preparing pyrrole-alcohol / graphene oxide solution; (3) preparing a strong-oxidant solution; (4) preparing an ultrafiltration base membrane containing pyrrole; (5) preparing a crude solvent-resistant compound nanofiltration membrane; (6) carrying out optimized treatment, thus obtaining the solvent-resistant compound nanofiltration membrane. The preparation method disclosed by the invention has the advantages that the prepared solvent-resistant compound nanofiltration membrane is a polypyrrole / graphene oxide compound nanofiltration membrane adopting polypyrrole / graphene oxide as a selecting layer; the compound nanofiltration membrane has excellent stability in alcohol substances, maintains high permeation flux and rejection rate, and is applicable to a separating system applying alcohol as medium. The preparation method is mainly used for preparing the solvent-resistant compound nanofiltration membrane.
Owner:HARBIN INST OF TECH
Sugar manufacture clarification process
ActiveCN104805226AReduce sulfur contentReduce color valuePurification using alkaline earth metal compoundsSugar crystallisationSulfurTurbidity
The invention discloses a sugar manufacture clarification process which comprises the following steps: adding lime milk into mixed cane juice to adjust the pH value to be 7.5-7.8, thereby obtaining lime-milk-added cane juice; filtering the lime-milk-added cane juice by using a horizontal screw centrifuge, thereby obtaining roughly filtered cane juice; heating the roughly filtered cane juice to be 55-65 DEG C, thereby obtaining cane juice which is heated for the first time; stoving the cane juice which is heated for the first time with SO2 until the intensity of sulfitation is 4-6 mL, thereby obtaining stoved cane juice; heating the stoved cane juice to be 80-90 DEG C, thereby obtaining cane juice which is heated for the second time; performing ultrafiltration clarification on the cane juice which is heated for the second time by using a ceramic membrane, thereby obtaining clear cane juice and membrane concentrated liquid; filtering the membrane concentrated liquid by using a plate-and-frame filter press, and returning the filtered membrane concentrated liquid to a roughly filtered cane juice storage tank. As a conventional sugar manufacture clarification process through a sulfurous acid method is combined with a membrane separation technique, a novel sugar manufacture clarification process is developed, the clarified cane juice prepared by using the process is low in color value, high in purity and low in turbidity, and the white sugar prepared from the cane juice is good in quality.
Owner:GUANGXI UNIV
Preparation method of polyethersulfone-based composite positive permeable membrane
InactiveCN105771703AHigh porosityImprove hydrophilicitySemi-permeable membranesMembranesPorosityPolyethylene glycol
The invention discloses a preparation method of a polyethersulfone-based positive permeable membrane, and relates to the field of membrane separation. The method comprises the following steps: dissolving polyethersulfone and polyethylene glycol in a solvent; coating membrane casting fluid on a low-temperature glass plate; leaving the membrane casting fluid to stand on the glass plate, and enabling the membrane casting fluid to generate thermally induced phase separation; finally immersing the glass plate into water, and enabling the solvent to be removed. The prepared base membrane is prepared into a polyamide separating layer by an interfacial polymerization method, the base membrane is sequentially immersed into an m-phenylene diamine-aqueous solution of which the percentage by weight is 1.0-4.0wt% and a trimesoyl chloride-hexane solution of which the percentage by weight is 0.05-0.2wt%, and finally heat treatment is performed at 60 DEG C for 300 s so that the polyethersulfone-based composite positive permeable membrane is obtained. The polyethersulfone-based composite positive permeable membrane prepared by the method disclosed by the invention has high hydrophilicity and porosity, and besides, a fault surface adopts a perforated finger shaped structure. Tests on properties of the composite membrane indicate that the composite membrane prepared by the method disclosed by the invention has a high permeation flux and a high interception rate.
Owner:BEIJING UNIV OF TECH
Thermal stable and super-hydrophobic ceramic-carbon nanotube composite membrane and application of membrane distillation water treatment thereof
ActiveCN107096393ALow resistance transmissionGuaranteed bondingMembranesGeneral water supply conservationReaction temperatureCarbon nanotube
The invention relates to a thermal stable and super-hydrophobic ceramic-carbon nanotube composite membrane and application of membrane distillation water treatment thereof, and belongs to the technical field of inorganic membranes. The composite membrane is prepared by the following steps of adopting a chemical vapor deposition method, using a ceramic hollow fiber membrane as a carrier, changing the different preparation conditions, such as a loading amount of a catalyst, reaction temperature and reaction time, and controlling the structure, loading amount and load state of the carbon nanotube, so as to obtain the ceramic-carbon nanotube hollow fiber composite membrane with different structures and properties. The composite membrane has the advantages that by regulating and optimizing the preparation conditions, the thermal stable and super-hydrophobic composite membrane with a carbon nanotube complete covering structure is obtained; the seawater freshening, high-salt wastewater zero drainage, and other wastewater high-efficiency treatment, such as electroplating heavy metal wastewater, dyeing and printing wastewater and antibiotic wastewater, can be realized via the composite membrane; and the good membrane distillation property is realized.
Owner:DALIAN UNIV OF TECH
High flow and overpressure resistant hyperfiltration membrane with laminar hole structure and method of preparing the same
A high-flux pressure resistant hyperfiltration membrane in layered pore structure is characterized in that the support layer of the hyperfiltration membrane is provided with macropores parallel with the surface of the hyperfiltration membrane, and the macropores are in multilayer structure. The high-flux pressure resistant hyperfiltration membrane is prepared by using the following method: (1) membrane solution is prepared by using a polymer, a magnetic material, an additive and a solvent; the magnetic material and the polymer account for 8 percent to 50 percent of the membrane solution by mass, and the magnetic material, and the combination of the magnetic material and the polymer account for 30 percent to 99 percent by weight; the additive accounts for 2 percent to 15 percent of the membrane solution by mass; (2) a magnetic field with the direction of lines of magnetic force parallel with the surface of the membrane is applied during evaporation and gelation in manufacturing of the membrane, and the intensity of the magnetic field ranges from 100 gauss to 18000 gauss. The infiltration flux of the hyperfiltration membrane in layered pore structure is high and no leakage occurs during pressurization and running. The hyperfiltration membrane can be used directly, and can be used as the multihole supporting material of a composite membrane.
Owner:HUBEI UNIV OF TECH
Organic-inorganic three-layer composite film and preparation method thereof
InactiveCN107930418AImprove bindingNot easy to leakSemi-permeable membranesPervaporationFilm material
The invention discloses an organic-inorganic three-layer composite film and a preparation method thereof, and belongs to the field of the preparation of film materials. The composite film comprises asupporting layer, a middle transition layer and a surface active layer, wherein the supporting layer adopts an inorganic film, with the surface average pore size being 10 to 800 nm; the middle transition layer adopts organic polymer, with the mass fraction being 1 to 10 percent, and the surface average pore size being 5 to 80 nm; the surface active layer adopts silicone rubber PDMS, with the filmlayer thickness being 1 to 10 micrometers. The organic-inorganic three-layer composite film takes an organic polymer film with controllable thickness and surface pore size as a middle transition layer, can optimally regulate the uniformity and thickness of the surface active layer of the composite film and the bonding strength between the dense surface active layer and the middle transition layerand between the inorganic film supporting layer and middle transition layer by controlling the viscosity of PDMS coating fluid. The composite film is large in permeation flux and high in separation factor, and the surface active layer is not easy to peel off, so that the composite film is applicable to organic solvent recovery and organic gas separation in pervaporation.
Owner:NANJING JIUSI HIGH TECH
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