422 results about "Microfiltration membrane" patented technology

The present disclosure relates to embodiments of a method for manufacturing a ceramic material comprising the steps of (a) homogenizing aluminum oxide, niobium pentoxide and solvent; (b) ultrasonicating the blend obtained in step (a); (c) adding an aliquot of the prepared suspension to the empty cavity of a mold, particularly between the polymeric mold and the metal mold; (d) immersing the mold into a coolant liquid-containing bath for sufficient time to ensure that all parts are completely frozen; (e) removing the ceramic body from the mold; (f) removing the solidified phase by means of sublimation hence obtaining a green tube; and (g) sintering the green tube, so as to obtain a solid structure. The present disclosure further relates to embodiments of a ceramic material and its use to manufacture a microfiltration membrane and / or a membrane support for fluid separation.

The utility model provides a mercury-containing organic wastewater treatment device in a Tibetan medicine processing process. The mercury-containing organic wastewater treatment device comprises a raw water tank, a micro-filtration membrane treatment unit, an electro-catalysis pretreatment unit, a mercury capturing and separating unit and a high-precision filtering unit which are sequentially connected, and the electro-catalysis pretreatment unit is further connected with a comprehensive waste gas purification unit; the mercury capture and separation unit comprises a chalcogenide reaction tank, a PAM reaction tank and a clarification tank which are communicated in sequence; the chalcogenide reaction tank is connected with a chalcogenide dosing device; and the PAM reaction tank is connected with a PAM dosing device. According to the utility model, the processes of filtration, electro-catalysis pretreatment, heavy metal capture, targeted adsorption and solid-liquid separation are adopted to treat a large amount of high-mercury, high-chromaticity, high-suspended-matter and high-COD wastewater generated in the Tibetan medicine zogtai processing process, so that the organic matter content of a water sample can be greatly reduced, the chromaticity of water is reduced, the suspended matter in water is removed, and the mercury concentration in water is reduced.

The invention discloses a preparation method of a super-hydrophilic PVDF (polyvinylidene fluoride) microfiltration membrane, belongs to the technical field of filter membrane processing, and is used for solving the technical problem that the hydrophilic performance and flux of a microfiltration membrane in the prior art need to be further improved. The preparation method comprises the following steps: putting modified PVDF, acetone, N, N-dimethylformamide and an auxiliary additive into a reaction kettle, and uniformly mixing to obtain a mixed solution; the preparation method comprises the following steps: preparing modified polyolefin from modified graphene and ethylene-co-maleic anhydride, carrying out a polymerization reaction on the modified polyolefin and PVDF subjected to a dehydrogenation fluorination reaction to obtain modified PVDF, preparing a membrane from the modified PVDF, a solvent and an auxiliary additive through a phase inversion method, and further carrying out dipping treatment to obtain the PVDF / PVDF composite membrane. The hydrophilic performance and flux of the PVDF micro-filtration membrane are improved, and the mechanical performance of the PVDF micro-filtration membrane is also improved.

The invention relates to the technical field of rural domestic sewage filtration, and discloses a rural domestic sewage filtration treatment device which comprises a treatment tank, the surface of the treatment tank is communicated with a water inlet pipe, one end, away from the water inlet pipe, of the treatment tank is communicated with a transmission pipe, the surface of the treatment tank is fixedly connected with a hydraulic rod, and the top of the hydraulic rod is fixedly connected with a linkage plate. The device further comprises a permeation component, and the permeation component comprises three frames. According to the rural domestic sewage treatment device, rural domestic sewage is conveyed into the treatment tank through the water inlet pipe, the ultrafiltration membrane can filter the sewage entering the treatment tank, large particles in the sewage are intercepted through the ultrafiltration membrane, the sewage is filtered for the second time through the microfiltration membrane, and the sewage can be discharged through the microfiltration membrane. The nanofiltration membrane can perform third filtration treatment on the sewage, and the microfiltration membrane and the nanofiltration membrane are used for performing separation treatment on impurities such as bacteria in the sewage, so that multiple filtration operation on the sewage is realized.

The invention belongs to the technical field of iron ion detection, and particularly relates to a rapid detection method for ferric ions in water, which comprises the following steps: a fluorescent probe preparation step: taking trihydrate of copper nitrate and tryptamine, adding into a centrifuge tube in sequence, adding ultrapure water, performing ultrasonic dissolution, transferring into a high-pressure reaction kettle, and performing hydrothermal reaction to obtain a fluorescent probe; cooling to room temperature, centrifuging the obtained yellow green solution in a centrifugal machine, and filtering the supernate through a microfiltration membrane to obtain a copper-doped carbon quantum dot CuCDs stock solution, namely the fluorescent probe; analyzing and determining Fe < 3 + >: taking the diluent of the prepared CuCDs solution, adding the diluent into a centrifugal tube containing a Fe < 3 + > standard solution, uniformly mixing, carrying out fluorescent quantitative analysis and detection, and exploring the change rule of the fluorescence intensity ratio of CuCDs; according to the rapid detection method for Fe < 3 + > provided by the invention, the synthesized CuCDs have high sensitivity, can realize on-site rapid detection of Fe < 3 + > in a water medium, and shows a wide application prospect in the field of environmental monitoring.

A hollow fiber filter membrane, and a preparation method therefor and the use thereof, which relate to the technical field of separation membrane materials. By using in-situ gas generation combined with ultrasonic-assisted phase separation technology, and by means of adjusting the ratio of each component in spinning dope, core liquid and coagulation bath formulations and adjusting a spinning process, a hollow fiber filter membrane having a unique structure and surface morphology is obtained. The cross section of the hollow fiber filter membrane is of an asymmetric gradient sponge-like pore structure, with the pore size increasing first and then decreasing from the inside to the outside. The inner surface has smooth and loosely arranged slit-shaped pores, and the outer surface has round pores. The membrane has a PMI pore size of 0.1-0.45 μm, and is a microfiltration membrane. The membrane has a water flux of up to 300-650 LMH@Psi and a low shear force during tangential flow filtration, and exhibits a good anti-fouling performance, strong alkali resistance, good biocompatibility, and adequate mechanical properties for use.

The invention belongs to the technical field of radioactive wastewater treatment and uranium extraction from seawater, and discloses a high-flux cellulose immobilized tannin membrane adsorption material as well as a preparation method and application thereof. The membrane adsorption material comprises an aldehyde cellulose acetate microfiltration membrane and waxberry tannin which is cured on the microfiltration membrane through gradient cross-linking. The membrane adsorption material provided by the invention keeps a reticular porous structure of a cellulose microporous filter membrane and has the characteristics of high flux and rapid mass transfer, the pure water flux of a single-layer membrane can reach 300 L / (m.h), the treatment capacity of a multi-layer membrane is remarkably increased, large-flow treatment can be realized, and the efficiency of extracting uranium from seawater or uranium-containing wastewater is remarkably improved.

The invention relates to the technical field of carbon nanotubes, and particularly discloses a purification method of a carbon nanotube. The purification method of the carbon nano tube comprises the following steps: (1) weighing a carbon nano tube crude product and various raw materials, (2) adding the carbon nano tube crude product and a surfactant into deionized water, and carrying out ultrasonic dispersion to obtain a dispersion liquid, (3) carrying out gradient centrifugation on the dispersion liquid, and taking an upper-layer suspension liquid, and (4) mixing hydrochloric acid, nitric acid and the suspension liquid, and treating the carbon nano tube to obtain the carbon nano tube. (5) treating the carbon nano tube by dilute acid, mildly oxidizing the carbon nano tube by using a low-concentration hydrogen peroxide solution, and then placing the carbon nano tube in a magnetic field to adsorb magnetic impurities, (6) carrying out cross-flow filtration by using a polycarbonate microfiltration membrane and collecting the treated carbon nano tube, and (7) annealing the treated carbon nano tube by using inert gas and freeze-drying to obtain the purified carbon nano tube. According to the purification method, the metal catalyst, amorphous carbon and graphite impurities can be efficiently removed, and meanwhile, the integrity of the tube wall of the carbon nano tube is kept.

The invention discloses a membrane device for treating electroplating nickel-containing wastewater, which comprises a microfiltration membrane assembly, a reverse osmosis high-pressure pump, a reverse osmosis membrane assembly, a primary concentration high-pressure pump, a primary concentration membrane assembly, a secondary concentration high-pressure pump, a secondary concentration membrane assembly, a connecting pipeline, an instrument panel and a membrane frame, the microfiltration membrane assembly, the reverse osmosis high-pressure pump, the reverse osmosis membrane assembly, the first-stage concentration high-pressure pump, the first-stage concentration membrane assembly, the second-stage concentration high-pressure pump, the second-stage concentration membrane assembly, the connecting pipeline and the instrument panel are all mounted on the membrane frame. The membrane device for treating wastewater is attractive, convenient to operate, small in occupied area and capable of being integrally migrated, a large amount of site construction work is saved, and standardized design and production can be achieved according to different water treatment amounts.

Provided are a method for producing ultrapure water, an apparatus for producing ultrapure water, and a system for producing ultrapure water, with which it is possible to sufficiently reduce the number of fine particles such as iron and silica in ultrapure water without using complicated equipment and without significantly reducing the amount of produced water. A method for producing ultrapure water, which comprises filtration treatment using one or more filtration membranes selected from the group consisting of an ultrafiltration membrane (UF), a microfiltration membrane (MF), and an ion exchange membrane, said filtration treatment being performed under conditions satisfying (1) and (2) at the same time. (1) The permeated water flux during filtration is within the range of 0.5-2.0 times the optimal permeated water flux determined by the inter-membrane pressure difference / permeated water flux of the filtration membranes. (2) The water recovery rate in the filtration treatment is 50% or more but less than 80%.

The invention discloses an efficient continuous PET (polyethylene terephthalate) degradation process based on a membrane method technology, which comprises the following steps: mixing an immobilized enzyme compound, a PET raw material to be degraded and a glycine buffer solution to form a reaction solution for degradation, then constructing a'continuous reactor 'by using two size screening membranes, performing primary separation by using an ultrafiltration membrane or a microfiltration membrane, and performing secondary separation by using an ultrafiltration membrane or a microfiltration membrane. A nanofiltration membrane or a reverse osmosis membrane is adopted for secondary separation of the degradation product, automatic separation of the degradation product and a reaction system and automatic purification of the degradation product are achieved, and then the enzymatic degradation efficiency and the product recovery efficiency are improved. Through the construction of the continuous reactor, the automatic PET degradation is realized, so that the costs in the aspects of labor, time, economy and the like are remarkably saved. The undegraded PET and a small amount of exfoliative enzyme can be circulated back to the reaction kettle after being intercepted by the size screening membrane, and the process not only can promote full contact between the undegraded PET and the hydrolase, but also can reduce the loss of the enzyme in the degradation process.

The invention belongs to the technical field of inorganic ceramic membranes, and relates to a preparation method of a high-permeation-flux silicon carbide ceramic microfiltration membrane. Coating a silicon carbide ceramic support with the coating liquid, drying to obtain a silicon carbide ceramic microfiltration membrane blank, and sintering the blank to obtain the silicon carbide ceramic microfiltration membrane with high permeation flux. According to the invention, the silane coupling agent is used as a bonding auxiliary agent of the coating liquid to couple the methyl cellulose and the silicon carbide, so that the viscosity of the methyl cellulose can be enhanced, the dispersity and the film-forming property of the coating liquid can be improved, the coating liquid is stable, only one-time coating is needed, an intermediate transition layer is not needed, and the cost is low. The silicon carbide ceramic microfiltration membrane with high pure water permeation flux can be prepared at a low sintering temperature, and the production time and cost of the silicon carbide ceramic microfiltration membrane are reduced.

The invention discloses a complex-containing electroplating wastewater treatment method, and belongs to the technical field of sewage treatment engineering, and the complex-containing electroplating wastewater treatment method comprises the following steps: S1, introducing complex-containing electroplating wastewater into an adjusting tank for homogenization and impurity removal; s2, carrying out complex breaking treatment on the homogeneous and impurity-removed complex-containing electroplating wastewater through a multi-source catalytic oxidation complex breaking unit; s3, the pH is adjusted, impurities in the complexed electroplating wastewater are moderately precipitated, then the complexed electroplating wastewater is filtered through a coagulation microfiltration membrane assembly, and a metal liquid phase is obtained; s4, after being fed into a resin recovery unit, eluting, and finally recovering valuable metals through an electro-deposition tank or a resin coupling evaporation concentration unit; s5, feeding the wastewater into a guarantee reaction sedimentation tank for oxidation reaction and coagulation reaction to obtain primarily treated wastewater; and S6, mixing the primarily treated wastewater, and treating the wastewater in an evaporation recycling system to obtain standard wastewater and industrial salt. According to the invention, heavy metal complexes in the electroplating wastewater can be effectively broken, and efficient recovery of heavy metals and reuse of wastewater reaching the standard are realized.

The invention provides a multistage composite microporous membrane electrode, a preparation method thereof and a water treatment and purification method. The multistage composite microporous membrane electrode comprises an inorganic ceramic microfiltration membrane, an anode electrocatalytic active layer and a cathode electrocatalytic active layer, the anode electrocatalytic active layer and the cathode electrocatalytic active layer are respectively positioned on two sides of the surface of the inorganic ceramic microfiltration membrane; the thickness of the inorganic ceramic microfiltration membrane is 2-6 mm, the thickness of the anode electrocatalytic active layer is 100-800 nm, and the thickness of the cathode electrocatalytic active layer is 1 [mu] m-1 mm; silicite nanocrystals are loaded on the inner walls of pore channels of the inorganic ceramic microfiltration membrane. The particle size of the silica zeolite nanocrystal is 50 to 200 nm. When the multi-stage composite microporous membrane electrode provided by the invention is used for water treatment and purification, oxygen molecules can be efficiently enriched in micropores, the conversion efficiency of hydroxyl radicals is improved, and efficient removal of refractory organic matters is realized.

The invention discloses a green alga polysaccharide extract for moisturizing spray and a preparation method of the green alga polysaccharide extract, relates to the technical field of plant polysaccharide extraction, and belongs to the patent classification number C08B37 / 00. Comprising the following steps: washing fresh green algae, drying and crushing, adding green algae powder into hot spring water, adding cellulase, pectinase and amylase, heating for enzymolysis reaction, after the enzymolysis reaction is finished, performing enzyme deactivation treatment to obtain enzymatic hydrolysate, filtering the enzymatic hydrolysate through a microfiltration membrane, and collecting microfiltration membrane permeate liquid, thereby obtaining the green algae. And filtering the microfiltration membrane permeate through an ultrafiltration membrane, collecting an ultrafiltration membrane trapped concentrated solution, and drying the ultrafiltration membrane trapped concentrated solution to obtain the green alga polysaccharide extract. According to the method, a membrane technology is adopted, a microfiltration membrane and an ultrafiltration membrane are combined to extract the green algae polysaccharide, the membrane separation and purification process is carried out under the normal temperature condition, the molecular structure of the green algae polysaccharide cannot be damaged, the activity of the green algae polysaccharide is kept, and the method is green, environmentally friendly, energy-saving and consumption-reducing.

The invention relates to a porphyrin iron-based biomimetic enzyme catalytic membrane for water treatment as well as preparation and application thereof, and belongs to the technical field of catalytic membranes. The porphyrin iron-based biomimetic enzyme catalytic membrane comprises a microfiltration membrane basement membrane and a porphyrin iron-based biomimetic enzyme catalyst loaded on the surface of the basement membrane in a chemical crosslinking mode, and the porphyrin iron-based biomimetic enzyme catalyst contains a catalytic activity center structure of 'Fe-N' coordination. The porphyrin iron-based biomimetic enzyme prepared by the invention is similar to a catalytic active center structure of natural peroxidase, has high affinity with hydrogen peroxide, and can greatly improve the utilization rate of hydrogen peroxide and the steady-state concentration of reactive oxygen free radicals; the constructed bionic enzyme-membrane reactor integrates dual functions of membrane separation and enzyme catalysis, realizes efficient combination of mass transfer and reaction, and greatly improves the removal performance of new pollutants in water.

The invention discloses a preparation method and application of Cu / N-CDs, and relates to the technical field of Cu / N-CDs preparation. The preparation method comprises the following steps: adding copper citrate, ethidene diamine and ultrapure water together, and ultrasonically stirring uniformly; transferring the obtained solution into a polytetrafluoroethylene reaction kettle, then placing the polytetrafluoroethylene reaction kettle in an electrothermal forced air drying oven, and carrying out hydrothermal reaction at 180 DEG C; naturally cooling, controlling the reaction liquid to be centrifuged, and filtering by adopting a microfiltration membrane; dialyzing the filtrate in ultrapure water for 24 hours by using a dialysis bag, and replacing new ultrapure water every 6 hours; and freeze-drying the dialyzed filtrate to obtain light brown solid powder, and marking the light brown solid powder as Cu / N-CDs. According to the preparation method, a one-step hydrothermal method is adopted, copper citrate and ethylenediamine serve as precursors, the prepared copper-nitrogen co-doped carbon quantum dots show excellent peroxidase-like catalytic activity through the synergistic effect of Cu < + > / Cu < 2 + > redox pairs, and the catalytic efficiency is remarkably improved compared with that of traditional nano-enzymes.

The invention relates to a method for synergistically regulating and controlling the aperture of a material separation membrane based on electric field-vacuum heating, which comprises the following steps: S1, uniformly mixing polysulfone, an additive and a solvent, and preparing a supporting layer membrane casting solution; s2, coating the surface of a polyolefin-based microfiltration membrane with the supporting layer membrane casting solution obtained in the step S1, and preparing a polysulfone ultrafiltration base membrane through immersion precipitation phase inversion; s3, uniformly mixing sulfonated polysulfone, N, N-dimethylformamide, ethylene glycol monomethyl ether and a pore-preserving agent to prepare a sulfonated polysulfone separation layer membrane casting solution; and S4, coating the surface of the polysulfone ultrafiltration base membrane obtained in the step S2 with the sulfonated polysulfone separation layer membrane casting solution obtained in the step S3, applying a direct-current electric field perpendicular to the surface of the membrane, and simultaneously performing vacuum heating to obtain the material separation membrane. An electric field and vacuum heating synergistic technology is adopted to induce oriented arrangement of sulfonated polysulfone to form an ordered structure, the membrane pore size and the membrane structure consistency are accurately controlled, and the membrane permeation flux and separation selectivity are optimized.

The invention belongs to the technical field of high polymer materials, and particularly discloses a polyvinylidene fluoride (PVDF) microporous filter membrane and a preparation method thereof. The PVDF microfiltration membrane comprises the following components: PVDF and has a spherical bouquet-shaped membrane structure; a two-step vapor induced phase separation (VIPS) method is adopted to induce film formation, and the two-step VIPS method comprises low-temperature and low-humidity induction and high-temperature and high-humidity induction treatment. According to the preparation method disclosed by the invention, the membrane forming process is controlled by controlling the formula of the membrane casting solution, adopting a two-step VIPS method to induce membrane forming and controlling key process conditions such as temperature, relative humidity and time in the membrane forming process, so that the PVDF microporous filter membrane with a special spherical bouquet-shaped membrane structure and relatively high flux is prepared; meanwhile, the membrane is simple in preparation process and easy to industrialize.

A stone cutting wastewater purification device comprises a shell, a filter unit, a wastewater input unit, a purified water output unit, a recovery tank and a backwashing device, the shell is of a cuboid structure, and a filter chamber and a backwashing chamber are arranged in the shell; the filtering unit comprises a micro-filtration membrane, the filtering aperture of the micro-filtration membrane is 0.1 micron, and the micro-filtration membrane is arranged in the filtering chamber; the wastewater input unit is used for introducing wastewater generated in the stone cutting process into the device; the purified water output unit is connected to the recovery tank; the backwashing device comprises a backwashing pump, a backwashing pipeline and nozzles, the backwashing pump is arranged in the backwashing chamber, and the backwashing nozzles are uniformly distributed in the filter chamber, are connected with the backwashing pump through pipelines, and are used for backwashing the microfiltration membrane and preventing the membrane surface from being blocked. According to the invention, efficient purification of stone cutting wastewater and long-term stable operation of equipment are realized.

The filtration element (1) includes a filtration membrane (3) enclosed within a housing (2). The element has openings for removing filtrate and concentrate. A filter (11) is disposed within the element (1) at an opening (6) in the housing (2) for introducing feed into the interior volume (20) of the filtration element (11). Alternatively, the filter (11) may be positioned within an end cap (7) associated with such opening. Pre-filtration is thus performed within the filtration element 1 itself, rather than as a separate upstream operation. The presence of the filter (11) does not significantly increase the pressure drop across the filtration module. Flocculated particles and other debris that accumulate on the membrane can be easily removed by backwashing, despite the presence of the filter (11).

The invention discloses an amino-modified graphene oxide hydrophilic membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane material preparation. The preparation method comprises the following steps: carrying out hydrophilic modification on graphene oxide by using an amino group modified substance through a blending method to obtain a membrane casting solution, and defoaming to prepare the hydrophilic membrane. The preparation method of the hydrophilic film is simple, amino groups and groups such as hydroxyl groups on the surface of the graphene oxide are strongly adsorbed through hydrogen bonds, and the hydrophilic film is relatively stable in property. According to the preparation method, the graphene oxide is directly subjected to surface hydrophilic modification, the graphene oxide hydrophilic film is prepared by adopting a blending method, a base film does not need to be used, and the production cost of the hydrophilic film is reduced; compared with an existing common commodity microfiltration membrane, the hydrophilic performance of the hydrophilic membrane is greatly improved, meanwhile, compared with a microfiltration membrane which is subjected to amino modified graphene oxide graft modification by taking a commercial microfiltration membrane as a base membrane, the hydrophilic performance of the hydrophilic membrane is equivalent to that of the commercial microfiltration membrane, and the hydrophilic membrane has higher cost performance.

The present invention relates to a reverse osmosis water treatment system comprising: a second- stage LSRRO (Low Salt Rejection RO membrane process) unit using a regenerated membrane as a reverse osmosis (RO) membrane, said regenerated membrane being obtained by subjecting a damaged membrane or a membrane which has reached the end of its service life to a physical and / or chemical treatment for reuse. The present invention comprises: an intake unit including an inlet line for seawater or organic wastewater equipped with an inlet valve, a raw water storage tank for storing the seawater or organic wastewater as raw water, and a feed pump for pressurizing the raw water at a predetermined flow rate and pressure at predetermined intervals; a pre-treatment unit including an ultrafiltration (UF) membrane or microfiltration (MF) membrane for removing fine particulate organic matter contained in the raw water to reduce the load on a downstream reverse osmosis (RO) membrane; and a first-stage RO (Reverse Osmosis) process unit to separate ionic substances included in the filtered water pre-treated by the UF or MF membrane using a reverse osmosis membrane to produce treated water and to separate the raw water into treated water and concentrated water. According to the present invention, there is an advantage in that an LSRRO system can be provided which concentrates raw water to a high concentration with lower energy consumption than conventional RO systems employing commercial membranes.

This invention discloses a device and method for rapid start-up and stable operation of IFAS-PN / A based on microfiltration membrane retention. The device includes a reactor body, an influent system, an effluent system, an aeration system, a heating system, an online monitoring system, and a stirring system. The reactor contains a biofilm carrier frame and a submerged MBR membrane module. The biofilm carrier frame is connected to a stirrer, and the MBR membrane module is connected to an effluent tank via an effluent peristaltic pump. During start-up, the anaerobic ammonia-oxidizing bacteria biofilm packing is fixed on the carrier frame and inoculated with activated sludge. The effluent is filtered through the microfiltration membrane, achieving complete retention of functional bacteria and precise control of sludge retention time. During operation, the peristaltic pump is started and stopped in conjunction with the influent and effluent level gauges to maintain a constant water level; precise adjustment of the target SRT is achieved through sludge discharge. This invention solves the problems of easy loss of functional bacteria, long start-up cycles, and poor operational stability, achieving efficient and stable denitrification of wastewater, with advantages of rapid start-up, stable operation, and precise control.

The invention discloses a hot galvanizing wastewater treatment method, which comprises: S1, mixing hot galvanizing pickling wastewater with alkali washing wastewater, adjusting the pH value, and introducing air to obtain a mixed wastewater liquid; s2, adding a composite additive A into the mixed wastewater liquid in the step S1, stirring to react, introducing CO2 gas after the reaction is completed, controlling the pH value of the wastewater to be 6-7, and then standing, settling and filtering to obtain supernate; and S3, adding a composite additive B into the supernatant in the step S2, carrying out a constant-temperature reaction, controlling the pH value to 8-9, and after the reaction is completed, carrying out microfiltration membrane treatment. According to the treatment method, all the steps are mutually linked in function positioning, multi-stage synergistic removal of heavy metal and ammonia nitrogen in the hot galvanizing wastewater is jointly achieved, and the effluent quality meets the corresponding emission standard requirement.

The utility model provides a microfiltration membrane filter which comprises a supporting pipe, a connecting port, a fixing buckle, a gland, a medium inlet, a filter element support, a filter element and a medium outlet, the connecting port is fixedly installed at the top of the supporting pipe, the fixing buckle is installed on the outer side of the connecting port, and the gland is installed on the outer side of the connecting port in an overturning mode. The fixing buckle is fixed on the outer side of the connecting port; the medium inlet is fixedly installed above the gland, the filter element support and the filter element are arranged in a staggered mode, and the filter element support and the filter element are installed in the supporting pipe in a sliding mode; the medium outlet is fixedly formed in the bottom end of the supporting pipe; due to the arrangement of the filter element bracket and the filter element, the integral stability is high, the filter membrane is not easy to damage, and the filtering effect is strong.

The application discloses a preparation method of a heavy ion microporous composite filtration membrane and application thereof, and relates to the technical field of membrane separation preparation, wherein the preparation method comprises the following steps: step one, compounding a nuclear pore membrane on the upper side of a first base material; step two, preparing a casting solution, and then casting the casting solution on a second base material to form a nascent membrane after scraping; step three, performing a blowing operation on the nascent membrane to obtain a pre-phase separation membrane; step four, immersing the pre-phase separation membrane in a coagulation bath to perform a solidification operation, and obtaining a solidified membrane; step five, performing an area stretching operation on the solidified membrane, and then performing a cleaning operation in pure water, and then performing a drying operation after the cleaning operation to obtain a microfiltration membrane; and step six, compounding the microfiltration membrane on the upper side of the nuclear pore membrane to obtain a composite filtration membrane. The preparation method of the heavy ion microporous composite filtration membrane improves the liquid stopping effect, filtration flux and flux stability of the filtration membrane by compounding the first base material, the nuclear pore membrane and the microfiltration membrane.

The invention belongs to the technical field of polyethersulfone, and particularly discloses a polyethersulfone microfiltration membrane with an integrally-formed double-layer structure and a preparation method of the polyethersulfone microfiltration membrane. The polyethersulfone microfiltration membrane is prepared from a single solution coating through an upper and lower layer dual induction process, and the cross section of the membrane is in a highly asymmetric form with a double-layer structure on the integrity; the upper layer is of a coarse-branch continuous macroporous structure and can accommodate more intercepted particles, so that the service life of the filter membrane is prolonged; the lower layer is of a fine branched continuous small hole structure, so that interception of particles can be ensured, and the filtering quality is improved; the upper layer and the lower layer are communicated in aperture, the structural cohesion is good, and no fracture phenomenon occurs; the thickness ratio of the upper layer to the lower layer is 2: (2.5-3.5); the preparation technology is simple and controllable in process, easy to implement, low in equipment requirement and suitable for batch production.

The invention relates to the technical field of block copolymer materials, in particular to a preparation method of a polystyrene-vinylpyridine block copolymer composite membrane. The preparation method comprises the following steps: firstly, preparing a polyvinyl pyridine macromolecular chain transfer agent, then preparing a polystyrene-polyvinyl pyridine block copolymer, dissolving the synthesized polystyrene-polyvinyl pyridine block copolymer, spin-coating the surface of a microfiltration membrane with the dissolved polystyrene-polyvinyl pyridine block copolymer, and adjusting membrane-forming and pore-forming parameters, so that the block copolymer forms a continuous and uniform membrane layer on the surface of a base membrane; meanwhile, the interface is tightly combined with the base membrane. According to the method, high monomer conversion rate and narrow molecular weight distribution are achieved under the synergistic effect of the chain transfer agent and the free radical initiator, the polymerization activity is maintained by supplementing the initiator in different stages, and the polymerization efficiency is effectively improved.

The application provides a method for separating and purifying 3-hydroxydecanoic acid from Pseudomonas bacteria. First, the fermentation product of Pseudomonas bacteria is decomposed by alkali to obtain monomers of 3-hydroxydecanoic acid. Then, activated carbon is used for decolorization, and microfiltration membrane and ultrafiltration membrane are used for treatment to remove macromolecular impurities. Finally, a sodium 3-hydroxydecanoate solution is loaded onto a polystyrene-divinylbenzene macroporous resin column modified by polyethyleneimine, and eluted with an ethanol-water (volume ratio 1:1) solution with a pH of 11. The eluate is collected, ethanol is evaporated, a purified sodium 3-hydroxydecanoate solution is obtained, hydrochloric acid is added to adjust the pH to 3-4, and the precipitate is collected by centrifugation and dried to obtain a 3-hydroxydecanoic acid product. The content of 3-hydroxydecanoic acid is detected by liquid chromatography, and the total content of 3-hydroxydecanoic acid in the purified product is higher than 90%. The method uses less organic solvent, the steps are simple, the purity of the obtained product is high, and the application requirements of cosmetics and pharmaceutical intermediates are met.