2270results about "Reverse osmosis" patented technology

The invention discloses a preparation method of an acid-resistant polyquaternary ammonium membrane based on a Porxitch interfacial polymerization reaction. The preparation method comprises the following steps: dissolving an amine monomer in a water-phase solvent to form a water-phase solution; dissolving a bromomethyl monomer in an organic phase solvent to form an organic phase solution; after the base membrane is soaked in the water phase solution for a period of time, the water phase solution is removed, and the water phase solution remaining on the surface of the base membrane is removed; coating the organic phase solution on the surface of a base membrane, and carrying out interfacial polymerization reaction for 1-15 minutes at the high temperature of 50-90 DEG C, so as to prepare a polyquaternary ammonium membrane on the base membrane; and washing the surface of the polyquaternary ammonium membrane with an organic solvent to remove residual reactants, and then carrying out heat treatment in a drying oven to obtain the acid-resistant polyquaternary ammonium membrane.

The invention relates to the technical field of ammonia water preparation, in particular to a raw water reverse osmosis treatment device for ammonia water preparation, which comprises a shell, the shell is formed by fixing an upper shell and a lower shell, a water inlet pipe is fixed in the middle of the top of the shell, a high-pressure water inlet component is arranged at the top of the water inlet pipe, and a concentrated water outlet pipe is fixed in the middle of the bottom of the shell. A drain valve is fixedly mounted at the bottom of the concentrated water outlet pipe; and the water pressure stabilizing assembly is arranged at the top of the inner wall of the shell. A multi-level pressure regulation and control mechanism is constructed in the reverse osmosis process, the problem of instantaneous pressure impact when the high-pressure pump is started is solved, physical damage to the membrane is avoided, a dual anti-blocking system of active rotary cleaning and back flushing is constructed, the membrane blocking probability is greatly reduced, meanwhile, the impact force of water flow is fully weakened in the back flushing stage, and the reverse osmosis efficiency is improved. It is ensured that the reverse osmosis membrane bears stable pressure all the time, and the problem of secondary damage to the reverse osmosis membrane caused by too large instantaneous pressure in the backwashing stage is avoided.

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention relates to the technical field of reverse osmosis membrane supports, in particular to a polyester non-woven fabric and a preparation method and application thereof.The preparation method comprises the steps that S1, polyester main body fibers and polyester adhesive fibers are used as raw materials to prepare high-quantitation original cloth M0 and low-quantitation original cloth H0; carrying out hot pressing pretreatment on the H0 to obtain a product H0 '; s2, overlapping and hot-pressing M0 and H0 'to obtain a composite non-woven fabric M1H1; s3, the M1H1 is impregnated with a functional solution, and the functional solution contains para-aramid nanofibers and nano calcium carbonate modified by hexadecyl trimethyl ammonium bromide; and then carrying out cold pressing on the composite non-woven fabric impregnated with the functional solution to obtain the nano-material modified composite non-woven fabric. And S4, carrying out secondary hot pressing treatment to obtain the polyester non-woven fabric. The polyester non-woven fabric can effectively avoid the problems of excessive curling, excessive permeation of a polysulfone solution and the like during curing after being coated with polysulfone, and is more beneficial to application in a reverse osmosis membrane.

This invention discloses a method for preparing an amphoteric Janus nanofiltration membrane. First, dopamine hydrochloride is dissolved in a mixed solution of tert-butyl hydroperoxide and Tris buffer solution. Then, a nylon-based membrane is immersed in the dopamine solution to modify its surface. Next, a dual-nozzle electrospinning device is used to electrospray tert-butyl hydroperoxide in ethanol solvent and 1,3,5-benzenetricarbonyl trichloride in 2-methyltetrahydrofuran onto one side of the dopamine-modified membrane, forming a positively charged active layer. The spraying solutions are then changed to tetraethylenepentamine in ethanol solvent and 1,3,5-benzenetricarbonyl trichloride in 2-methyltetrahydrofuran, and the same spraying parameters are used to electrospray the other side of the dopamine-modified membrane to form a negatively charged active filtration layer. The resulting membrane is then vacuum-dried and thermosetting to obtain the amphoteric Janus nanofiltration membrane. The prepared amphoteric Janus nanofiltration membrane has positive and negative charges on both sides, respectively. When different sides are used, it has a good filtration effect on anionic or cationic dyes in wastewater and has a high water flux.

This disclosure relates to the fabrication of high-performance thin film composite (TFC) reverse osmosis (RO) membranes comprising a thin polyamide rejection layer (thickness of 100-200 nanometer), a porous substrate including polysulfone (PSf) layer (thickness of 40-50 micron) cast on polyester nonwoven fabric (thickness of ˜100 micron). Hydrophilic and antibacterial TFC polyamide RO membranes were developed by incorporating green Lignin and nanostructured silver-based metal organic frameworks (MOFs) into the selective layer. The polyamide layer of TFC RO membranes was fabricated on the porous PSf substrate by interfacial polymerization between aqueous monomer solutions containing MPD, and adequate additives in water and organic monomer solutions containing TMC in the mixture of hexane and co-solvents. The optimized produced RO membranes were provided water flux of 95-100 LMH and sodium chloride (NaCl) salt rejection of 98.5-99.0% during filtration of 2000 ppm NaCl solution at 225 psi pressure, and water flux of 55-60 LMH and sodium chloride (NaCl) salt rejection of 98.6-98.9% during filtration of 35000 ppm NaCl solution at 800 psi pressure. This disclosure also relates to developing a roll-to-roll PSf membrane as a substrate for making TFC RO membranes for water desalination

The invention relates to the technical field of water treatment, and provides a reverse osmosis membrane cleaning method, a cleaning agent composition and application. According to the method, whether cleaning is needed or not is determined by comparing initial operation parameters and current operation parameters of a system; the pollutant type is accurately judged by observing the appearance characteristics of the membrane surface and detecting related index parameters; and selecting a corresponding cleaning agent formula according to the pollutant type, and sequentially performing physical washing and chemical cleaning. The cleaning agent composition comprises a biological pollution cleaning agent, an organic pollution cleaning agent and / or an inorganic scaling cleaning agent. By establishing a scientific pollution diagnosis system and a targeted cleaning strategy, the problems of fixed cleaning scheme and low pertinence in the prior art are solved, the pressure difference recovery rate after cleaning can reach 90% or above, the desalination rate recovery rate can reach 99% or above, the cleaning efficiency is remarkably improved, the operation cost is reduced, and the service life of the membrane is prolonged.

The invention relates to the technical field of membrane separation and seawater desalination, in particular to a high-boron-removal-rate reverse osmosis membrane and a preparation method and application thereof. The polyamide reverse osmosis membrane with at least 70% nodular areas on the surface is prepared by introducing the ethylenediamine tetraacetic acid metal salt into the water phase solution as a complexing additive, and the boron removal rate of the membrane can be improved on the basis of ensuring the retention rate and flux of the membrane.

According to the efficient water treatment system based on the reverse osmosis membrane and the control method provided by the invention, gradient anti-pollution membrane arrangement and reconfigurable intelligent waterway design are creatively combined, so that a foundation is laid for high-flux and low-pollution operation from a physical structure; meanwhile, a full-closed-loop intelligent control system is constructed, and by fusing fuzzy logic, an optimization algorithm and a neural network prediction model, the system can integrate multi-dimensional information such as inlet water quality, membrane pressure difference and water yield, judge pollution risks in real time and adaptively and seamlessly switch among a high recovery mode, a segmented flushing mode and a prediction cleaning mode, so that the system is high in recovery efficiency and high in reliability. Meanwhile, parameters such as pump frequency and valves are dynamically optimized to find an optimal balance point of recovery rate and energy consumption; according to the invention, the recovery rate can be stably improved, the membrane pollution rate is greatly reduced, the chemical cleaning period and the service life of the membrane element are prolonged, and finally, the comprehensive operation and maintenance cost of the system is remarkably reduced while the water treatment efficiency and the water quality safety are improved.

The present invention relates to a method for automated data processing to assess the state of multiple filtration membranes used in liquid filtration. The method involves receiving data from state sensors positioned within or near a set of membranes, which process incoming water into permeate and concentrate flows. This data, collected as time series at predefined frequencies, pertains to external physical parameters. An operating indicator is determined from this data, forming a second time series. Both the first and second time series are recorded as point clouds over a specified acquisition period. An intermediate operating indicator is generated, representing the state of new, clean, or cleaned membranes, using a learned normalization model. Finally, a normalized operating indicator is produced, characterizing membrane fouling and aging, independent of environmental variations, and forming a third time series. This method enhances the accuracy of membrane state assessment in filtration systems.

This invention relates to the field of water treatment technology, specifically to a reverse osmosis membrane cleaning agent composed of a non-oxidizing bactericide and an enzyme, and its application. Its main purpose is to remove biofouling from reverse osmosis membranes and restore membrane flux. This patent discloses a novel reverse osmosis membrane cleaning agent formulation. Considering the different pH requirements of the cleaning agent in actual production, different types of bioactive hydrolytic enzymes are selected to disrupt the structure of bacterial cell walls and their extracellular polymers. A reducing agent and a non-oxidizing bactericide are combined to enhance the cleaning effect of the reverse osmosis membrane. For different cleaning purposes, non-oxidizing bactericides suitable for acidic and alkaline cleaning are formulated. Sodium benzoate and benzalkonium chloride show good application prospects in the removal of reverse osmosis membrane fouling.

A membrane includes a polysulfone-based support, a polydopamine (PDA) layer disposed on a surface of the polysulfone-based support, and a silver / polydopamine (Ag / PDA) composite layer disposed on a surface of the polydopamine layer. The polysulfone-based support has a pore size of up to 600 nanometers (nm). The Ag / PDA composite layer contains core-shell structure particles and spherical particles. The core-shell structure particles have a silver nanoparticle core and a polydopamine shell. The spherical particles are silver-decorated polydopamine particles. The membrane can at least partially separate an Erichrome Black T (EBT) dye from an EBT dye / salt containing mixture by rejecting the EBT dye and allowing the EBT dye / salt containing mixture to pass through the membrane.

A membrane made of a polymeric support, and an active layer with a polyamide grafted with a copolymer on the polymeric support. The copolymer is reacted units of a diallyldimethylammonium chloride (DADMAC), 3-(N,N-diallyl-N-methylammonio)propanesulfonate (DAMAPS), and N,N-diallyldodecane-1,12-diamine (DADA), and the copolymer is grafted to the polyamide with a linking molecule. Further, a method of making the membrane by dissolving an amine and the copolymer in water to form an aqueous solution, dissolving TMC in an organic solvent to form an organic mixture, pouring the aqueous solution onto a polymeric support and then pouring the organic mixture onto the same support for form a coated support, and heating the coated support to form a membrane.

The utility model relates to a wall-mounted water purifier and a water path system used for the same. The water path system comprises a water inlet electromagnetic valve, at least two booster pumps and at least two reverse osmosis filter elements, the water inlet electromagnetic valve is connected to the raw water inlet end, pure water outlets of the reverse osmosis filter elements are connected to the pure water outlet end, and the reverse osmosis filter elements and the booster pumps are arranged between the water inlet electromagnetic valve and the pure water outlet end in parallel; each booster pump is correspondingly connected to each reverse osmosis filter element; the bypass unit comprises a bypass pipeline and a bypass switch, the bypass water inlet end of the bypass pipeline is connected between the raw water inlet end and the water inlet electromagnetic valve, and the bypass water outlet end of the bypass pipeline is connected between the reverse osmosis filter element and the pure water outlet end; the bypass switch is installed on the bypass pipeline and used for controlling connection or disconnection of the bypass water inlet end and the bypass water outlet end. Through the arrangement of the bypass unit, the at least two reverse osmosis filter elements and the booster pump, the requirements of normal water use, emergency water use and large-flow water use of a user are met.

The invention belongs to the technical field of membrane separation, and particularly relates to a recrystallized silicon carbide ceramic nanofiltration membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: applying a polycarbosilane solution to a silicon carbide ceramic ultrafiltration body, and carrying out first pyrolysis to obtain a pyrolysis material; a polycarbosilane solution is applied to the pyrolysis material, and then second pyrolysis is carried out; the first pyrolysis process comprises the following steps: heating to 290-310 DEG C from room temperature, and preserving heat; raising the temperature from 290-310 DEG C to 790-810 DEG C, and keeping the temperature; raising the temperature from 790 to 810 DEG C to 1190 to 1210 DEG C, and keeping the temperature; the second pyrolysis comprises first pyrolysis and recrystallization which are carried out in sequence; the recrystallization process comprises the following steps: heating from 1190-1210 DEG C to 1590-1610 DEG C, and preserving heat; the temperature is increased to 2190-2210 DEG C from 1590-1610 DEG C, and heat preservation is conducted. The aperture of the recrystallized silicon carbide ceramic nanofiltration membrane is smaller than 10 nm, and nanofiltration can be achieved.

The invention relates to the technical field of data processing, and discloses an automatic control method and system for wastewater desalination treatment based on the Internet of Things. The method comprises the following steps: acquiring a membrane surface image, an interface potential, an infrared spectrum, a transmembrane pressure difference, a feeding flow rate and a flocculation image; calculating a salt gradient attention feature vector according to the salt concentration difference value and the Beckey number; inputting the multi-modal data into a membrane pollution time sequence memory network to obtain a pollution development rate and a flocculant adding proportion; extracting a floc particle size parameter to obtain a flocculation effect score; and constructing a multi-objective function optimization solution to obtain a control instruction. The salt gradient attention mechanism and the membrane pollution time sequence memory network are introduced, and visual image recognition and multi-modal data fusion are combined, so that the problems of inaccurate membrane pollution state evaluation, low intelligent level of a control algorithm and insufficient multi-target collaborative optimization capability in the prior art are solved; the automation level and the treatment efficiency of wastewater desalination treatment are improved.

The invention relates to the technical field of reverse osmosis membranes, in particular to a multilayer composite anti-biological-pollution reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane is prepared by the method. The method comprises the following steps: immersing a base membrane into a prepared water phase solution, and sequentially carrying out first immersion treatment and drying treatment in the shade to obtain a first membrane sheet; immersing the first membrane into a prepared organic phase solution, removing the redundant organic phase solution on the first membrane after second immersion treatment, and obtaining a second membrane after interface reaction; and immersing the second membrane into a prepared antibacterial metal ion solution, and carrying out complexation reaction to obtain the multi-layer composite anti-biological-pollution reverse osmosis membrane. According to the invention, the multilayer composite anti-biological pollution reverse osmosis membrane with prolonged antibacterial activity and improved membrane separation performance can be prepared.

The invention provides an intelligent maintenance cleaning device for nanofiltration membrane pollution control and a method thereof, and solves the problems of low maintenance cleaning efficiency, poor adaptability of cleaning parameters and pollution conditions and frequent chemical cleaning of an existing nanofiltration system. Belongs to the technical field of membrane pollution control. According to the invention, the filtering system, the cleaning system and the intelligent decision-making module are integrally designed, so that the closed-loop control of the whole process of real-time monitoring, pollution identification, intelligent decision-making and automatic cleaning of the running state of the nanofiltration membrane is realized. The cleaning effect gating memory neural network model is used as a membrane pollution prediction model, membrane pollution can be accurately predicted, and key cleaning nodes can be identified. The optimal membrane cleaning parameters are generated by adopting a non-dominated sorting genetic algorithm, the usage amount of chemical agents and the cleaning cost are reduced, and the membrane pollution control effect is improved. The invention is applicable to the field of drinking water treatment.

The invention provides an impurity deep removal and purification device in ES fiber solvent recovery. Relates to the technical field of electrostatic spinning process and solvent recovery, and comprises a pre-separation module used for removing fiber residues and solid particles larger than 5 microns in solvent-enriched gas; the multi-stage deep condensation module comprises two stages of condensers, and the two stages of condensers condense the solvent steam according to the gradually decreased temperature and intercept micro-droplet impurities; and the composite adsorption module is used for adsorbing residual organic trace impurities and removing water. The impurity deep removal and purification device in ES fiber solvent recovery has the advantages of being low in energy consumption, easy and convenient to maintain, stable in operation and capable of being continuously online for 72 h or above without shutdown, the solvent recovery rate is remarkably increased, the operation cost is reduced, and the potential risk of organic vapor emission to the environment and operation safety is effectively avoided.

The invention discloses a crown ether modified nanofiltration membrane for selective separation of lithium and magnesium and a preparation method of the crown ether modified nanofiltration membrane, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: by taking a porous ultrafiltration membrane as a substrate and 2-aminomethyl-18-crown-6 ether and polyamine as water-phase monomers, carrying out interfacial polymerization reaction on the water-phase monomers and trimesoyl chloride on the surface of the porous ultrafiltration membrane to form a polyamide layer; wherein 2-aminomethyl-18-crown-6 ether is introduced into the polyamide separation layer in the form of a covalent bond through a reaction with trimesoyl chloride. The prepared nanofiltration membrane can effectively intercept Mg < 2 + > and provide an exclusive transport channel for Li < + >, so that the Li < + > smoothly crosses the membrane, and the lithium-magnesium separation effect is achieved. The method is simple in preparation process operation, low in energy consumption and easy to amplify, can be used for salt lake lithium extraction, and has a wide industrial application prospect.

The invention discloses a low-energy-consumption anti-pollution reverse osmosis membrane element and a preparation method thereof, and belongs to the technical field of membrane separation. The reverse osmosis membrane element comprises a central pipe, a plurality of water inlet separation nets and a plurality of reverse osmosis membrane bag units, the water inlet separation nets and the reverse osmosis membrane bag units are sequentially stacked and wound on the central pipe, each water inlet separation net is of a double-layer discontinuous net structure, and each reverse osmosis membrane comprises three layers of structures: the lowest layer is a base membrane, the middle layer is a supporting layer, and the bottom layer is a water inlet layer. An uppermost separation layer; the main preparation process comprises the following steps: preparing materials, preparing a reverse osmosis membrane supporting layer, preparing a reverse osmosis membrane separating layer and rolling the reverse osmosis membrane element. The anti-pollution performance of the reverse osmosis membrane is improved through burdening and a preparation process of the reverse osmosis membrane, and the resistance and the energy consumption are reduced by utilizing the structure of the water inlet separation net.

The invention belongs to the field of membrane separation, and provides a conductive nanofiltration membrane, a roll type conductive membrane filter element and a nanofiltration separation method.The conductive nanofiltration membrane comprises a substrate layer, a conductive layer and a separation layer and is prepared through a two-step vacuum filtration process and a vacuum filtration assisted in-situ interfacial polymerization method; meanwhile, good conductivity and selective separation capability are realized. In addition, the invention also provides a roll-type conductive membrane filter element based on the conductive nanofiltration membrane, and the roll-type conductive membrane filter element comprises the conductive nanofiltration membrane, a central conduit with a plurality of side holes, a water production diversion separation net, a water inlet diversion separation net, a counter electrode conductive layer, a conductive connector lug and a metal sheet (used for power connection), the roll type conductive membrane filter element can dynamically regulate and enhance the separation performance of charged molecules, ions and the like under the action of an electric field, and has the characteristics of simple structure, easiness in operation and amplification and adjustable and controllable membrane performance.

The invention belongs to the field of plant extracting solution concentration, and discloses a low-pressure high-power concentration device for a plant extracting solution and a concentration method using the low-pressure high-power concentration device. The device is based on a series reverse osmosis membrane stack and a feeding pump, a fresh water collecting tank, a booster pump, three types of pressure sensors, two types of osmometers, a water inlet pressure control system and a one-way valve are additionally arranged, the three types of pressure sensors are used for detecting the pressure of a feeding header pipe, the pressure of concentrated water and the pressure of a fresh water header pipe respectively, and the two types of osmometers are used for detecting the osmotic pressure of the feeding header pipe and the osmotic pressure of the concentrated water respectively. The water inlet pressure control system adjusts the design pressure of the device and the osmotic pressure of the plant extracting solution by adjusting the frequencies of the booster pump and the feeding pump, so that accurate monitoring of parameters is realized, efficient concentration of the plant extracting solution under low pressure is guaranteed, scaling on the surface of a reverse osmosis membrane is delayed, the service life of a membrane stack is prolonged, and continuous production of membrane concentration and filtration is realized.

The invention relates to the technical field of membrane separation and water treatment, in particular to an anti-pollution polyurea composite reverse osmosis membrane as well as a preparation method and application thereof. According to the preparation method, a polyamine monomer of a water phase solution and an aromatic polyisocyanate monomer of an organic phase solution are used for constructing a polymerization reaction system to form a urea bond structure, and terminal sealing treatment is cooperatively performed on a polyurea selection layer, so that the compact, flat and hydrophilic polyurea selection layer can be prepared. And the preparation method is simple, mild in condition, low in energy consumption, robust in process, wide in parameter window and suitable for large-scale production. The prepared anti-pollution polyurea composite reverse osmosis membrane has excellent anti-pollution performance and separation performance, can achieve excellent balance between maintenance of initial flux and long-term stability, and has excellent anti-pollution performance and separation performance. The reverse osmosis membrane shows low irreversible pollution rate and good cleaning recoverability to organic / inorganic typical sewage plugging substances, can well meet industrial requirements, and has a good application prospect.

The invention discloses a hollow fiber nanofiltration membrane based on interfacial polymerization regulation and a preparation method thereof. The method comprises the following steps: preparing a water phase system and an oil phase system, and sequentially injecting the water phase system and the oil phase system into a hollow fiber ultrafiltration membrane; performing interfacial polymerization reaction on the water phase system and the oil phase system on the surface of the hollow fiber ultrafiltration membrane; and drying to obtain the hollow fiber nanofiltration membrane. By adopting the method, the interception performance and flux of the nanofiltration membrane can be effectively adjusted, and the stability and applicability of the nanofiltration membrane are improved. The nanofiltration membrane is low in water contact angle and high in oil contact angle. Particularly, the surface porosity, the effective aperture, the sodium sulfate retention rate, the sodium chloride retention rate, the flux of sodium sulfate, the flux of sodium chloride and other properties of the nanofiltration membrane can be designed and accurately controlled according to requirements, and the properties of the nanofiltration membrane can be accurately designed and customized by adopting the method disclosed by the invention; the performance of the green and natural modified hollow fiber ultrafiltration membrane is realized, and an innovative solution is provided for high-salt resource recovery.

The invention discloses a polyamide acid-resistant nanofiltration membrane and arsenic removal application thereof in hair dye preparation. According to the amide acid-resistant nanofiltration membrane, a polyamine monomer and trimesoyl chloride are subjected to an interface reaction on an ultrafiltration supporting bottom membrane, and the polyamide acid-resistant nanofiltration membrane containing the Telogen structure is obtained. According to the method for removing the arsenic in the hydroxyethyl diphosphoric acid, a polyamide acid-resistant nanofiltration membrane containing a Troger structure is adopted for at least one time of filtration treatment, the concentration of arsenate in the hydroxyethyl diphosphoric acid after secondary filtration treatment is reduced to 4.60 mg / kg from 480.02 mg / kg, and the arsenic content of the hair dye prepared from the hydroxyethyl diphosphoric acid is smaller than 0.07 mg / kg. According to the polyamide acid-resistant nanofiltration membrane containing the Troger structure, which is obtained by adopting a limited preparation method, the acid resistance is greatly improved, the separation selectivity is higher, arsenic in hydroxyethyl diphosphate can be effectively removed, and the arsenic content in a hair dye is greatly reduced.

The invention relates to a seawater desalination reverse osmosis membrane and a preparation method thereof, and relates to the field of seawater desalination treatment.The preparation method comprises the following steps that a supporting membrane is cleaned and dried, and the pretreated supporting membrane is obtained for standby application; immersing the pretreated support membrane into the water phase liquid, taking out the support membrane, and scraping off redundant water phase liquid to obtain a base membrane loaded with a water phase; carrying out contact reaction on the base membrane loaded with the water phase and organic phase liquid to obtain a reacted base membrane; carrying out heat treatment on the reacted base film to obtain a cured base film; and immersing the cured base membrane into the grafting modified monomer solution, taking out the cured base membrane, carrying out ultraviolet curing to obtain a modified membrane, washing the modified membrane, and storing the washed modified membrane in water to obtain the seawater desalination reverse osmosis membrane. The seawater desalination reverse osmosis membrane prepared by the invention has high flux, good desalination effect and anti-pollution performance, has good stability, and can keep good working performance for a long time.

The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method and application of a high-permeability polyamide reverse osmosis membrane. According to the invention, the problems of high energy consumption and poor water production quality caused by non-ideal flux and rejection rate of the current reverse osmosis membrane product are solved, tetrabutylammonium bromide and acyl chloride form ion pairs to reduce hydrophobicity, a hydrogen bond network of urea destroys a hydrophobic barrier of an organic phase, and migration of acyl chloride to a water phase interface is promoted; the eutectic solvent is adsorbed on a water phase interface to form a'catalytic microenvironment ', amido of an amine monomer is attracted to be close to the interface, and the concentration of a reaction area is increased. During reaction, tetrabutylammonium bromide enables an amine monomer to stably attack a transition state of acyl chloride through electrostatic interaction, and reaction activation energy is reduced; urea and sodium hydroxide in a water phase can be jointly used as an acid-binding agent to neutralize generated hydrochloric acid so as to prevent amido protonation inactivation. The method is simple to operate and suitable for large-scale production.

The invention provides a preparation method of a polyamide thin-layer composite membrane, which is characterized by comprising the following steps: pretreating a base membrane, and adsorbing amino active groups on the surface of the pretreated base membrane; taking the base membrane out of the solution and then placing the base membrane below a base membrane reaction chamber; carrying out microwave vaporization on an organic phase solution containing polyacyl chloride, introducing the vaporized organic phase solution into a base membrane reaction chamber, and carrying out vapor / liquid interfacial polymerization reaction on the vaporized organic phase solution and the base membrane; and carrying out heat treatment on the reacted membrane material to finally obtain the polyamide thin-layer composite membrane product. According to the preparation method of the polyamide thin-layer composite membrane, provided by the invention, the polymerization process can be more finely controlled, and the structural performance of the membrane can be adjusted. The utilization rate of the solvent is improved, the environmental pollution is reduced, and meanwhile, the high efficiency of the process and the high reproducibility of the result are ensured. The invention also provides a polyamide thin-layer composite membrane and application thereof.

The invention belongs to the field of separation membranes, and particularly relates to an anti-pollution and washable reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane provided by the invention is prepared according to the following steps: soaking a nascent state polyamide reverse osmosis membrane in a first treatment solution, taking out and cleaning, then soaking in a second treatment solution, taking out and draining to obtain the anti-pollution and washing-resistant reverse osmosis membrane, the nascent state polyamide reverse osmosis membrane comprises a non-woven fabric layer, a porous support layer and a polyamide separation layer which are in contact in sequence; the first treating fluid contains double-end amino polyethylene glycol and triethylamine; the second treatment liquid contains polyvinyl alcohol and alpha-aldehyde group-omega-carboxyl polyethylene glycol. Experimental results show that the reverse osmosis membrane provided by the invention has relatively high anti-pollution capacity, desalting rate and acid and alkali cleaning resistance.