35 results about "Polysulfone membrane" patented technology

The invention belongs to the technical field of water electrolysis hydrogen production diaphragms, and relates to coating slurry for a composite diaphragm in an alkaline electrolytic cell and a preparation method of the coating slurry. The coating slurry comprises a high-molecular polymer, an inorganic hydrophilic oxide, a polymer electrolyte, a pore-foaming agent and an organic solvent. The high-molecular polymer is polysulfone, and the inorganic hydrophilic oxide is titanium dioxide; and the polymer electrolyte is acacia gum. And the pore-foaming agent is polyvinylpyrrolidone. Titanium dioxide is used as a filler, so that the hydrophilicity of the hydrophobic polysulfone membrane can be improved, and the transfer of hydroxyl ions is facilitated. Hydroxyl, amino and other hydrophilic groups of the acacia gum are migrated to a membrane-water interface, and the groups and a membrane matrix are combined to form a hydrogen bond network, so that the stability and the water adsorption capacity of the membrane are enhanced, and the composite membrane with low surface resistance, smooth surface, compact coating and good mechanical capacity is obtained. The nylon and the acacia gum are adopted, cost is low, and large-scale production is facilitated.

The invention discloses a preparation method of a TA modified aminated ZIF-90 polyamide reverse osmosis membrane, which comprises the following steps: by taking a self-made polysulfone membrane as a base membrane, firstly soaking the base membrane in a water phase solution, then soaking the base membrane in an oil phase solution containing aminated ZIF-90, then treating the base membrane with a tannic acid (TA) / ethanol solution, and finally performing heat treatment to obtain the target polyamide reverse osmosis membrane. Aminated ZIF-90 is used for modifying a polyamide membrane, then TA is used for modifying a surface layer, and compared with an original membrane, the prepared membrane material is effectively improved in water flux and salt interception; after chlorine treatment, the attenuation rate of water flux and salt interception is smaller than that of the original membrane, which indicates that the chlorine resistance of the modified polyamide membrane is superior to that of the original membrane; meanwhile, the modified polyamide membrane has excellent anti-pollution performance.

The invention discloses a hemodialysis membrane with a self-anticoagulation function and a preparation method of the hemodialysis membrane. The hemodialysis membrane with the self-anticoagulation function is obtained by modifying natural polymer fibrin, polydopamine and a sulfonic acid type polymer solution. The hemodialysis membrane is any one or more of a polysulfone membrane, a polyether sulfone membrane, a polyvinylidene fluoride membrane, a polymethyl methacrylate membrane, a polyacrylonitrile membrane, a polyamide membrane, a polyvinyl alcohol membrane, a cellulose acetate membrane and a polypropylene membrane. The invention is used for treating acute and chronic kidney diseases, has good biocompatibility, and shows good blood compatibility in the aspects of inhibiting protein adsorption, platelet adsorption and red blood cell adsorption, reducing hemolysis rate, prolonging blood coagulation time and the like. And the risk of thrombosis caused by improper use of an anticoagulant in a continuous anticoagulation treatment process can be effectively avoided, and the living quality and the survival time of a hemodialysis patient are effectively improved and prolonged.

The application relates to the technical field of composite materials, and discloses a mixed-fiber fabric reinforced thermoplastic composite material laminated plate and a preparation method and application thereof. The laminated plate is obtained by die molding a preformed body, wherein the preformed body comprises a plurality of mixed-fiber fabrics and thermoplastic resin films which are sequentially stacked in layers, and the thermoplastic resin film is selected from one or more of a polyamide film, a polyphenylene sulfide film, a polyether ether ketone film, a poly (aryl ether ketone) film, a polycarbonate film and a polysulfone film. The prepared thermoplastic laminated plate is uniform in resin distribution and excellent in comprehensive mechanical properties.

The invention discloses a bagasse microcrystalline cellulose immobilized enzyme polysulfone membrane packed bed reactor, and belongs to the technical field of biology. According to the immobilized D-pantoic acid lactone hydrolase packed bed reactor, commercial immobilized enzyme is not adopted, the enzyme activity is effectively improved through the physical adsorption effect or weak chemical adsorption effect of the enzyme and the adsorbent, the enzyme is not prone to leaking out in the reaction, and additional environmental pollution is avoided. In addition, the proenzyme reaction device and the external circulation quasi-immobilized enzyme reaction device can react simultaneously, all existing process parameters are not changed, and the reaction speed is greatly increased. After the reactor is repeatedly used for 10 times, the hydrolysis rate is kept at 28% or above, and after the immobilized enzyme is stored at 4 DEG C for 180 days, the initial enzyme activity is kept at 90% or above. The production cost is greatly reduced, and repeated disassembly and assembly are not needed, so that the disassembly and assembly time is saved, the production efficiency is improved, and good economic and social benefits are generated.

The invention relates to the technical field of polymer composite materials, in particular to a PPy / PSf / PEG polymer composite membrane and a preparation method and application thereof.The preparation method comprises the steps that a polysulfone membrane is fixed to stainless steel and then clamped to a platinum electrode clamp to serve as a working electrode, and a three-electrode system is constructed; dispersing a pyrrole monomer into deionized water to obtain a first electrolyte, adding the first electrolyte into a sulfuric acid aqueous solution, uniformly mixing, and then adding ZrO2-C nanoparticles to obtain a second electrolyte; placing the three-electrode system in a first electrolyte, depositing for 0.5-1 hour at the current density of 0.4-0.6 mA / cm < 2 >, then placing the three-electrode system in a second electrolyte, depositing for 1.5-3 hours at the current density of 0.1-0.4 mA / cm < 2 >, taking down the electrodeposited polysulfone membrane, cleaning with deionized water, and drying for the first time to obtain a PPy / PSf composite membrane; the PPy / PSf composite membrane is completely soaked in a polyethylene glycol aqueous solution for 3-5 h, then taken out and dried for the second time, and the PPy / PSf / PEG composite membrane is obtained. The PPy / PSf / PEG polymer composite membrane prepared by the preparation method disclosed by the invention has relatively high helium flux and selectivity.

The preparation method comprises the following steps: step 1, first interfacial polymerization: immersing a polysulfone support membrane into a polyamine water phase solution, taking out the polysulfone support membrane, removing a solvent, immersing the polysulfone support membrane into an acyl chloride A part hydrolyzed oil phase solution, and carrying out first interfacial polymerization reaction, so as to obtain a polysulfone membrane; a nascent state reverse osmosis membrane is obtained; step 2, secondary interfacial polymerization: removing unreacted acyl chloride from the nascent state reverse osmosis membrane, then immersing the nascent state reverse osmosis membrane into an oil phase solution of acyl chloride B to carry out secondary interfacial polymerization reaction, and then carrying out heat treatment to obtain a reverse osmosis membrane semi-finished product; and step 3, third interfacial polymerization: immersing the semi-finished reverse osmosis membrane product into an oil phase solution of o-methylaniline, carrying out third interfacial polymerization, and carrying out heat treatment again to obtain the ultra-high-desalination and anti-oxidation reverse osmosis membrane. Under the condition of ensuring that the water flux is not greatly reduced, the ultra-high desalination rate of the reverse osmosis membrane is realized, and the service life of the membrane is prolonged.

The invention relates to the technical field of membrane separation, and discloses a preparation method of a high-lithium-ion-selectivity open-chain crown ether composite membrane. According to the method, a polysulfone (PSF) membrane is used as a base membrane, m-amine monomers are added into a water phase, acyl chloride monomers and o-phenylene dioxodiacetyl chloride (OPDM) monomers are added into an oil phase, the OPDC monomers are introduced into a separation layer through an interfacial polymerization method, and the open-chain crown ether composite membrane with high lithium ion selectivity is prepared. The open-chain crown ether composite membrane prepared by the method shows excellent lithium ion separation performance and stability, and a reference thought is provided for related fields such as preparation of an ion selective membrane, efficient recovery and extraction of liquid-phase lithium resources and the like.

The invention relates to the technical field of biomedical materials, in particular to an anticoagulation hemodialysis membrane, a base material of the anticoagulation hemodialysis membrane is polysulfone or polyethersulfone, the anticoagulation hemodialysis membrane is of a porous asymmetric structure, and the inner wall surface, making contact with blood, of the hemodialysis membrane is of a bionic micro-nano composite structure. The structure comprises micron-sized bulges and nano-sized particles distributed on the surfaces of the micron-sized bulges, a zwitterionic polymer is covalently grafted on the surface of the micro-nano composite structure and the inner wall of a membrane pore channel; heparin molecules are covalently bonded to the tail end of the zwitterionic polymer. According to the anticoagulant hemodialysis membrane, the anticoagulant performance is qualitatively improved while the excellent mechanical strength, solute clearance rate and ultrafiltration performance of a traditional polysulfone membrane are kept.

The invention relates to a high-flux antibacterial composite membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a polysulfone membrane layer by a non-solvent induced phase separation method; (2) preparing a two-dimensional material MXene modified polyamide membrane layer on the polysulfone membrane layer in the step (1) through an interfacial polymerization method; (3) preparing a tannic acid / Ag < + > film layer on the polyamide film layer modified by the two-dimensional material MXene in the step (2) through an in-situ growth method; and (4) preparing an Ag film layer on the tannic acid / Ag < + > film layer in the step (3) through a co-deposition method. The composite membrane provided by the invention has high flux and excellent antifouling and antibacterial properties, and the preparation method reduces energy consumption and saves cost.

The present invention relates to the method for efficient removal of phenolic compounds from wastewater generated from petroleum industry. The method is two-step process. The first step is a pre-treatment process which operates through adsorption-based separation using granular activated carbon. The wastewater in this step is allowed to pass through a column packed with granular activated carbon. In the second step, the pretreated wastewater is subjected to membrane-based treatment. The present invention also relates to the design of a special membrane for effective removal of phenolic compounds from waste water. The membrane formulation includes polysulfone as the main polymeric matrix and carbon dots coated powdered activated carbon as the additive which acts as the active agent for the removal of phenolic compounds. The membranes are designed in two different types, viz., (i) flat sheet and (ii) hollow fiber. The membrane-based separation using the flat sheet membranes can be done with the help of a dead-end filtration set up. In case of hollow fiber membranes, a cylindrical membrane module with a large number of hollow fiber membranes is designed. The membranes are reusable with excellent separation efficiency. The membrane module has proper feed inlet, outlet for permeates and outlet for retentates. This present invention provides removal of ~99% phenolic compounds from petroleum industry wastewater.

The invention discloses a preparation method and application of a sulfhydrylated Mg-MOF-74 polysulfone composite membrane. The preparation method comprises the following steps: introducing a hydrophilic polymer into a polysulfone base material through a free radical polymerization method, and carrying out non-solvent induced phase separation to obtain a modified polysulfone membrane; the preparation method comprises the following steps: modifying Mg-MOF-74 nano particles by using a silane coupling agent containing a sulfydryl group, so as to obtain sulfhydrylated Mg-MOF-74; and modifying the P-PSF membrane by using the sulfhydrylated Mg-MOF-74 nanoparticles to construct a surface micro-nano coarse structure, and finally obtaining the sulfhydrylated Mg-MOF-74 polysulfone composite membrane with oil-water separation and heavy metal ion adsorption functions. According to the preparation method disclosed by the invention, a silane coupling agent containing a sulfydryl group and hydroxyl on the surface of the Mg-MOF-74 are creatively coupled to obtain the sulfhydrylated Mg-MOF-74, and the sulfhydrylated Mg-MOF-74 has a wide application value in the fields of oily sewage treatment, heavy metal ion adsorption and the like.

The present invention relates to the technical field of polymer composite materials, and in particular to a PPy / PSf / PEG polymer composite membrane and a preparation method and application thereof. The preparation method comprises: fixing a polysulfone membrane on stainless steel, and then clamping it on a platinum electrode clamp as a working electrode to construct a three-electrode system; dispersing a pyrrole monomer in deionized water to obtain a first electrolyte, taking the first electrolyte and adding it to a sulfuric acid aqueous solution to mix, and then adding ZrO2-C nanoparticles to obtain a second electrolyte; placing the three-electrode system in the first electrolyte, and conducting a 200 nm ion ion electrolysis reaction at a current density of 0.4 to 0.6 mA / cm 2 The electrolyte was deposited for 0.5 to 1 hour and then placed in the second electrolyte at a current density of 0.1 to 0.4 mA / cm 2 After deposition for 1.5 to 3 hours, the polysulfone membrane treated with electrodeposition is removed, rinsed with deionized water, and dried for the first time to obtain a PPy / PSf composite membrane. The PPy / PSf composite membrane is then completely immersed in a polyethylene glycol aqueous solution for 3 to 5 hours, removed, and dried for the second time to obtain a PPy / PSf / PEG composite membrane. The PPy / PSf / PEG polymer composite membrane prepared by the present invention has high helium flux and selectivity.

The utility model provides a semipermeable membrane for hemodialysis and a hemodialysis device. Specifically, the semipermeable membrane sequentially comprises a first polyester fiber non-woven fabric supporting layer and a second polyester fiber non-woven fabric supporting layer, a first chitosan layer; a porous polysulfone membrane, wherein the average pore size of pores in the porous polysulfone membrane is in the range of 5 nm to 50 nm; a second chitosan layer; and a second polyester fiber non-woven fabric supporting layer. The semi-permeable membrane for hemodialysis has good biocompatibility, wider waste removal capacity (besides small molecular substances (such as urea and creatinine), middle molecular substances (such as beta2-microglobulin) can be effectively removed) and good durability.

The present invention relates to the field of reverse osmosis technology, and discloses a reverse osmosis membrane for purified water after semiconductor cleaning. The reverse osmosis membrane in the present invention is composed of a base layer, a support layer, and a functional layer, wherein the base layer is a non-woven fabric, the support layer is a composite polysulfone membrane layer, and the functional layer is a composite polyamide membrane layer; the NH2-MIL-125@MXene QDs nanomaterial introduced into the composite polysulfone membrane layer and the composite polyamide membrane layer not only improves the water flux, but also adsorbs metal ions entering the membrane layer, further improving the removal rate of metal ions, and has antibacterial properties, thereby improving the anti-pollution performance of the membrane layer; the composite polyamide membrane layer also introduces a PVA / CS composite material, which improves the removal rate of impurities in the solution by the membrane layer, and also improves the hydrophilicity of the membrane layer, thereby improving the water flux and anti-pollution performance.

The application discloses a dopamine in-situ growth ZIF-8 dye / salt separation loose nanofiltration membrane and a preparation method thereof, and comprises the following steps: preparing a Tris buffer solution by taking a Tris buffer solution as a solvent and an alcohol-water mixed solution; preparing a precursor solution by adding dopamine, polyethyleneimine and a metal ion compound into the buffer solution; depositing the precursor solution on a polysulfone membrane surface; dissolving 2-methylimidazole in the alcohol-water mixed solution and then depositing the 2-methylimidazole on the polysulfone membrane surface; pouring off the excess solution, drying the membrane and then storing the membrane in deionized water to obtain a filter membrane. The nanofiltration membrane prepared by the application can intercept dyes and almost completely pass bivalent inorganic salts, and can fully separate a mixed solution of Congo red, methyl blue and sodium sulfate. Meanwhile, the application is simple in operation, can be popularized to various material substrates, and has great application value and development prospect.

A filtration membrane includes a polysulfone (PFS) membrane support, and a crosslinked polyamide layer disposed on the PFS membrane support. The crosslinked polyamide layer includes a network formed by polycondensation between diethylenetriamine and trimesoyl chloride, and graphene oxide (GO) nanosheets covalently bonded to the network via a linking spacer. The linking spacer includes a backbone chain having at least 8 backbone atoms. The backbone chain has a plurality of amine groups including —NH— and —NH2, and the linking spacer is bonded to the graphene oxide nanosheets via a —Si—O— bond and bonded to the network via reactions between trimesoyl chloride and the plurality of amine groups. A filtration method includes filtering a mixture including water and an organic molecule through the filtration membrane to generate a water permeate.

The invention relates to the technical field of water treatment membrane preparation, in particular to a method for preparing a high-performance polyamide composite membrane by blending amino acid with a polysulfone membrane supporting body. The polyamide water treatment membrane with high water flux and high salt rejection rate is prepared by blending amino acid and polysulfone to enhance binding force and combining metal ion complexing and strong chelating agent dissociation technologies.

The invention belongs to the technical field of biomedical materials, and particularly relates to a thin-layer composite membrane hemostatic material with hemostatic and antibacterial capabilities. According to the material, a polysulfone membrane serves as a supporting layer, a thin-layer composite membrane is formed through an interfacial polymerization method, a functional layer is a vancomycin-loaded mesoporous nano-material, and the content of the mesoporous nano-material in the composite membrane is 0.5%. The thin-layer composite membrane has stable mechanical strength, can provide a lasting hemostatic effect, and enhances the blood coagulation process by promoting platelet aggregation and activation. The thickness of the functional layer is about 200nm, and the functional layer is tightly combined with the supporting layer to form a uniform and stable composite membrane structure. In addition, the surface of the mesoporous nano material is provided with negative charges and ammonia hydroxyl groups, and vancomycin can be loaded and slowly released, so that the antibacterial ability is improved. The invention also provides a preparation method of the composite nano hemostatic material, which comprises the following steps: firstly, preparing a mesoporous nano material, chemically modifying the surface of the mesoporous nano material, loading vancomycin, and embedding the mesoporous nano material into a polysulfone membrane support layer formed by an interfacial polymerization method to finally obtain the thin-layer composite membrane hemostatic material with hemostatic and antibacterial capabilities. The material is good in biocompatibility and free of toxic and side effects, and has wide application potential in the fields of hemostasis and antibiosis.

A method includes preheating a feedstock film of polysulfone (PSU), polyphenylsulfone (PPSF or PPSU) or polyethersulfone (PES) in an oven at a temperature of 350 DEG F to 450 DEG F for 30 to 200 seconds to produce a moisture-free film, the feedstock film being in the form of a web, sheet or disc, cutting the moisture-free film into pieces, and thermoforming each moisture-free piece to produce an orthodontic appliance.

The application discloses a crosslinking type phosphoric acid doped polysulfone proton exchange membrane and a preparation method, and particularly relates to the following steps: firstly, a modified polysulfone containing isocyanate groups at the end is prepared, then 4-hydroxyethyl benzaldehyde is added for reaction, and then the modified polysulfone is dissolved in N,N-dimethylacetamide, and p-aminobenzene propyl triazole is added dropwise for Schiff base reaction to prepare a modified polysulfone membrane material containing active hydrogen at the end; then the modified polysulfone membrane material is dissolved in dimethylacetamide, nitrogen is introduced, and hexamethylene diisocyanate is added, dried, demolded, washed, and finally soaked in a phosphoric acid solution, and the crosslinking type phosphoric acid doped polysulfone proton exchange membrane is prepared. According to the method, the phosphoric acid groups are far away from the polymer main chain, the influence of water on the main chain is reduced, the number of phosphoric acid binding sites is increased, the phosphoric acid doped polysulfone proton exchange membrane can maintain a high phosphoric acid doping amount, and in addition, the proton exchange membrane can maintain good dimensional stability under high ion conductivity.

The invention relates to the technical field of reverse osmosis, and discloses a reverse osmosis membrane for purified water after semiconductor cleaning. The reverse osmosis membrane is composed of a base layer, a supporting layer and a functional layer, the base layer is non-woven fabric, the supporting layer is a composite polysulfone membrane layer, and the functional layer is a composite polyamide membrane layer; nH2-MIL-125-at-MXene QDs nano materials introduced into the composite polysulfone membrane layer and the composite polyamide membrane layer not only have the effect of improving the water flux, but also can adsorb metal ions entering the membrane layers, so that the removal rate of the metal ions is further improved, and the membrane layer has antibacterial performance and the anti-pollution performance of the membrane layer is improved; a PVA / CS composite material is also introduced into the composite polyamide membrane layer, so that the removal rate of impurities in a solution by the membrane layer is improved, the hydrophilicity of the membrane layer is also improved, and the water flux and the anti-pollution performance are further improved.

The application discloses a multifunctional layered composite film of MXene@h-BN and a preparation method and application thereof, and relates to the field of water treatment. The multifunctional layered composite film of MXene@h-BN is a layered composite film formed by assembling MXene@h-BN composite multifunctional material obtained by mixing MXene and h-BN through ball milling as a top layer on a base film. The MXene@h-BN obtained by mixing MXene and h-BN through ball milling is used as the top layer, a polysulfone film (PS) is used as the base, and the above two materials are coupled by using an interfacial cross-linking polymerization method, so that the multifunctional layered composite film of MXene@h-BN is prepared. After the multifunctional layered composite film of MXene@h-BN is coupled with a sunlight introduction device, the multifunctional layered composite film of MXene@h-BN is applied to the field of water treatment and has the following advantages: 1. the base PS film is assembled with the MXene@h-BN composite material, so that the membrane pore size is reduced, and the physical interception effect on pollutants is enhanced; 2. h-BN and MXene are excellent adsorption materials, and the adsorption and enrichment performance on micro-pollutants is enhanced; and 3. a heterojunction is formed between h-BN and MXene, the response to sunlight and the utilization efficiency are improved, so that the photocatalytic degradation of water micro-pollutants and membrane pollutants is realized, and the membrane self-cleaning function is realized.

This invention belongs to the field of membrane separation technology, specifically relating to a method for preparing a high-efficiency boron-removing reverse osmosis membrane, comprising the following steps: (1) immersing a polysulfone membrane sequentially in a glucoside solution, a mixed solution of m-phenylenediamine and diol, and a pyromellitic acid chloride solution; (2) coating the membrane surface after step (1) with a high iodide solution; and (3) subjecting the membrane obtained after step (2) to heat treatment to obtain the high-efficiency boron-removing reverse osmosis membrane. The process of this invention is simple, the raw materials are inexpensive and readily available, making it suitable for large-scale production of reverse osmosis membranes. Simultaneously, the prepared reverse osmosis membrane has a high boron rejection rate and permeate flux, and can be used for high-efficiency boron removal treatment of seawater or brackish water.

The invention relates to the technical field of membrane materials, in particular to a fluoride-free hydrophobic polysulfone porous membrane as well as a preparation method and application thereof. The porous membrane comprises a matrix, and the matrix comprises first fibers; pores are formed among the first fibers, the PMI average pore size of the porous membrane is 0.1-10 [mu] m, and the porosity of the porous membrane is 30-80%; the porous membrane comprises a first surface and a second surface which are oppositely arranged; the first surface is in contact with the external environment; the initial water contact angle of the first surface is 95-160 degrees; according to an ATR method infrared absorption spectrum of the first surface, a first peak exists between 2910 cm <-1 > and 2930 cm <-1 >, a second peak exists between 1140 cm <-1 > and 1160 cm <-1 >, the ratio of the peak area of the first peak to the peak area of the second peak is a first hydrophobic coefficient X, and the first hydrophobic coefficient X is 0.001-0.4. The fluoride-free hydrophobic polysulfone porous membrane disclosed by the invention has both hydrophobic performance and air permeability, has relatively good mechanical property and long service life, and can be used as a waterproof air-permeable / sound-permeable membrane and an air sterilization membrane.

The application relates to a catalytic membrane preparation technology, and aims to provide a preparation and application method of MnO2@NiCu LDH catalytic membrane with a full non-radical process degradation. The method comprises the following steps: the whole polysulfone membrane is immersed in ultrapure water, one side surface of the polysulfone membrane is immersed in an ethanol aqueous solution containing fluorosilane at room temperature, cross-linking polymerization is generated between the fluorosilane and the surface structure of the polysulfone membrane; the polysulfone membrane with fluorosilane on one side is obtained by taking out and cleaning with deionized water; the MnO2@NiCu LDH catalyst is uniformly dispersed in an aqueous solution, and then the catalyst is assembled on the fluorosilane side of the polysulfone membrane through suction filtration; after drying treatment, the MnO2@NiCu LDH composite membrane is obtained. The composite membrane is applied to wastewater containing quinolone antibiotics, and the non-radical process in the catalytic activation degradation process is close to 100%; under different pH conditions, the composite membrane shows strong catalytic performance and a wide adaptability range. The product has strong anti-interference ability and wide application prospect, and effectively avoids the problem of powder catalyst recovery after water treatment.

The application relates to the field of membrane separation technology and discloses a preparation method of a high-lithium-ion-selectivity open-chain crown ether composite membrane. The method takes a polysulfone (PSF) membrane as a base film, adds an imine monomer in water, adds an acyl chloride monomer and an o-phenylenedioxydiacetyl chloride (OPDC) monomer in oil, introduces the OPDC monomer into a separation layer through an interfacial polymerization method, and prepares the open-chain crown ether composite membrane with high lithium ion selectivity. The open-chain crown ether composite membrane prepared through the method has excellent lithium ion separation performance and stability, and provides a reference idea for the preparation of ion selective membranes, efficient recovery and extraction of liquid phase lithium resources and other related fields.

The present invention relates to the field of plant food processing, and in particular to a soymilk with good stability and a preparation method thereof. The preparation method of the soymilk comprises: grinding the soaked soybeans once, mixing the obtained first grinding product with bean dregs and swelling them at 50-55°C, and then performing ultrasonic treatment at 25-50kHz and 20-40°C; grinding the material after ultrasonic treatment twice, centrifuging the obtained second grinding product at 4000-8000rpm, and taking the supernatant; passing the supernatant through a 170-250 mesh sieve, and then filtering it with an organic polysulfone membrane. The soymilk prepared by the present invention has the following characteristics: 1. The protein content in the soymilk is higher than 50%; 2. It has good stability and no precipitation after centrifugation for 5000 revolutions; 3. The color is clear and there is no sense of suspension; and the soybean flavor is strong.

The present invention relates to the technical field of high-salt water treatment, and provides a method and system for concentration and reduction of a short-process evaporation pond, the method comprising the following steps: S1. Preliminary treatment of wastewater from the evaporation pond using a sand filtration system and a composite scale inhibitor; S2. The wastewater after preliminary treatment is concentrated using a primary concentration system, and then enters a secondary concentration system to concentrate the wastewater; S3. After the wastewater is concentrated, the water produced by the secondary concentration system is returned to the water inlet of the primary concentration system, and the water produced by the primary concentration system is sent to a secondary reverse osmosis filtration system, and the water produced by the secondary reverse osmosis filtration system meets the standards and is discharged or reused; wherein, the membrane material in the primary concentration system is a modified polysulfone membrane. The present invention realizes short-process evaporation concentration and reduction through a sand filtration system + a composite scale inhibitor + a multi-stage membrane filtration system. This method is simple and convenient, and can realize low-pressure and high-fold concentration of wastewater.

This invention relates to a highly selective acid-resistant nanofiltration membrane, its preparation method, and its application, belonging to the field of membrane separation technology. The preparation method of the highly selective acid-resistant nanofiltration membrane includes the following steps: (1) immersing a polysulfone membrane in an aqueous solution containing a strong oxidant and metal chloride; (2) immersing the membrane treated in step (1) in a hexane solution containing pyrrole molecules and allowing it to stand; (3) spraying a mixed ethanol solution of phenol and formaldehyde onto the membrane treated in step (2); (4) placing the membrane treated in step (3) in a hot sodium hydroxide solution containing a surfactant for post-treatment to obtain the highly selective acid-resistant nanofiltration membrane. This invention features a simple process, readily available raw materials, and is suitable for industrial production; simultaneously, the highly selective acid-resistant nanofiltration membrane, while possessing strong acid resistance, exhibits high selectivity for both divalent and monovalent ions, making it suitable for the desalination treatment of acidic industrial wastewater.