222 results about "Dialysis membranes" patented technology

The invention belongs to the field of carbon nanomaterials, and provides a method for preparing a carbon quantum dot material doped with elements such as silicon and aluminum by oxidative depolymerization and stripping of coal gangue. Comprising the steps of screening and matching of coal gangue, oxidative depolymerization stripping, centrifugal dialysis membrane filtration and modification, drying and the like, raw materials and all the steps are specifically set, and the particle size or fluorescence performance of fluorescent carbon dots can be specifically selected and set according to selective oxidative depolymerization stripping conditions. The main particle size of the prepared multi-inorganic-element doped carbon quantum dot material is kept within the range of 1.5-2.0 nm, the structure is stable, the optical performance also meets the requirements, and the material can be further modified and is expected to be applied to the fields of photovoltaic equipment, biological imaging, photocatalytic degradation of organic pollutants or sensing and the like.

A method for producing a fluoropolymer aqueous dispersion, including a step A of subjecting a pre-treatment aqueous dispersion containing a fluoropolymer obtained by polymerization in the presence of a hydrocarbon surfactant to ultrafiltration, microfiltration, or dialysis membrane treatment, or a combination thereof. The ultrafiltration is performed using an ultrafiltration membrane having a molecular weight cutoff of 0.3×104 Da or more.

The invention discloses high-toughness low-yellowness polyethersulfone as well as a preparation method and application thereof. The impact strength of the polyethersulfone is greater than 90J / m, and the yellowness index is less than 25. The polyether sulfone provided by the invention is especially suitable for application in some high-end fields, such as the fields of water treatment membranes, hemodialysis membranes and the like.

The invention belongs to the technical field of membrane separation, and discloses a preparation method of a double-layer hemodialysis membrane capable of releasing negative ions. The preparation method takes polyether sulfone (PES) as a membrane material and a tourmaline-graphene oxide (TM-GO) composite material as an additive, and comprises the following steps: preparing the tourmaline-graphene oxide (TM-GO) composite material; preparing a PES membrane casting solution and a membrane casting solution formed by blending PES and TM-GO; carrying out vacuum defoaming treatment on the membrane casting solution, and then blade-coating a double-layer membrane on a glass plate; and putting the blade-coated membrane into a coagulating bath formed by mixing N, N-dimethylformamide (DMF) and water, and carrying out phase inversion treatment, so as to obtain the double-layer hemodialysis membrane capable of releasing negative ions. The prepared double-layer hemodialysis membrane capable of releasing the negative ions has an excellent toxin removing effect, meanwhile, the negative ions can be released to enter a human body along with blood flow while hemodialysis treatment is conducted, and the membrane is endowed with the anti-oxidation function.

The invention belongs to the technical field of seawater desalination assistance, and particularly relates to a seawater desalination assistance system capable of relieving the burden of a dialysis membrane, the seawater desalination assistance system comprises an electrolytic tank, a first channel, a second channel and a third channel are arranged in the electrolytic tank from left to right in sequence, and the first channel and the second channel are separated by an anion exchange membrane; the channel II and the channel III are separated by a cation exchange membrane, seawater enters and is discharged from two sections of the channel I, the channel II and the channel III through pipelines and electric control valves, and a water electrolysis device is mounted between the channel I and the channel III. The seawater desalination auxiliary system has the remarkable beneficial effects that firstly, the innovative multi-channel design is combined with the ion exchange membrane, so that the burden of the dialysis membrane is effectively relieved, the service life of the membrane is prolonged, the maintenance cost is reduced, meanwhile, the water electrolysis device and the control system cooperatively operate, accurate regulation and control can be realized according to the real-time state of seawater, and the service life of the membrane is prolonged. The seawater desalination efficiency is greatly improved, and the energy consumption is reduced.

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.

1. Name of the design product: In-vehicle Dialysis Membrane Vent Aroma Diffuser (C-251). 2. Use of the design product: It is used to hold fragrance substances and clip it at the air outlet of the car air conditioner for use and fragrance diffusion. 3. Design key points of the design product: lies in the shape. 4. The picture or photo that best shows the design key points: Perspective View 1.

The invention discloses a method for purifying and recovering phosphoric acid from phosphoric acid waste liquid by a whole membrane method, which mainly comprises a pretreatment device for removing suspended matters and solid particle impurities in the phosphoric acid waste liquid; the waste phosphoric acid separation and purification device is used for removing metal salt impurities in the phosphoric acid waste liquid through a three-stage separation membrane; the waste phosphoric acid dialysis and purification device is used for recovering phosphoric acid from concentrated acid generated by the separation and purification device through a two-stage dialysis membrane; the acid concentration device is used for concentrating and reducing dilute phosphoric acid generated by the separation and purification device and the dialysis and purification device through a concentration membrane; the waste acid storage tank and the dilution tank are used for homogenizing and diluting the phosphoric acid waste liquid; through the method, the final phosphoric acid recovery rate is greater than 90%, and the removal rate of metal salt impurities in the recovered phosphoric acid is greater than 95%.

The invention discloses a silk fibroin / hydroxyapatite composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: pouring a precursor solution into a long cylindrical mold with an open end and a closed end, and then sealing the open end of the mold by using a soft porous plug wrapped by a dialysis membrane; horizontally immersing the mold in methanol for at least 4 days, applying a constant thrust of 30-300N to the porous plug wrapped by the dialysis membrane during the period, uniformly and slowly pushing the soft porous plug wrapped by the dialysis membrane into the mold, and overturning the mold up and down by 180 degrees once every 2-4 hours to obtain a molded body; and removing the mold, soaking the molded body in pure water for at least 7 days, and drying at normal temperature to obtain the silk fibroin / hydroxyapatite composite material. The three-point bending strength of a bone nail with the length of 150mm formed by machining the hydroxyapatite / silk fibroin bone nail can reach 235N, the tensile fracture resistance can reach 153MPa, and the mechanical property is obviously superior to that of a hydroxyapatite / silk fibroin bone nail prepared by an existing forming method.

The invention discloses an antibacterial nanofiber hemodialysis membrane and a preparation method thereof, and relates to the technical field of dialysis membranes, and the preparation method comprises the following steps: mixing a chitosan derivative, heparin, dopamine, an unsaturated monomer and an initiator in a DMF / phosphate buffer mixed solution to obtain a surface treating agent; taking the polyethersulfone nanofiber membrane as a supporting layer, dipping in a surface treating agent, and performing UV irradiation to form a functional layer, thereby obtaining the dialysis membrane. The preparation method comprises the following steps: compounding phenanthroline cerium triacrylate hybridized CeO2 with N-vinyl pyrrolidone, sodium p-styrenesulfonate and lauryl methacrylate to obtain an unsaturated monomer, compounding the unsaturated monomer with a chitosan derivative, heparin and dopamine to prepare a surface treating agent, impregnating a polyether sulfone nanofiber membrane, and carrying out irradiation curing to form a functional layer. The prepared hemodialysis membrane has efficient anticoagulation and broad-spectrum antibacterial properties, high permeability, low protein adsorbability and long-term stability.

The invention provides a resource recycling method of ammonium-containing waste sulfuric acid, which comprises the following steps: (1) respectively introducing a solvent and ammonium-containing waste sulfuric acid into two sides of a dialysis membrane for diffusion dialysis treatment, and respectively obtaining a sulfuric acid solution and an acidic ammonium sulfate solution on two sides of the dialysis membrane; and (2) carrying out bipolar membrane electrolysis treatment on the acidic ammonium sulfate solution to obtain ammonia water and ammonium-containing sulfuric acid. According to the method disclosed by the invention, sulfuric acid and ammonium ions (converted into ammonia water) in the ammonium-containing waste sulfuric acid can be efficiently and greenly recovered, the obtained ammonium-containing sulfuric acid can also be repeatedly recovered, and resource recovery of the ammonium-containing waste sulfuric acid is realized under the condition of ensuring low cost.

The invention provides a hemodialysis hollow fiber membrane and a preparation method thereof, and belongs to the technical field of separation membranes. Raw materials of the hollow fiber membrane comprise a spinning solution and a core solution, the spinning solution comprises 5wt%-20wt% of a polymer A, 1wt%-10wt% of a polymer B, 1wt%-5wt% of a pore-foaming agent and the balance of an organic solvent; the core liquid comprises 30wt%-70wt% of an organic solvent and the balance of water; the polymer A is selected from polyether sulfone, polysulfone, polyamide, cellulose acetate or polyacrylonitrile; and the polymer B is polyarylester. The preparation method comprises the following steps: carrying out vacuum defoaming treatment on a spinning solution; the spinning solution and the core solution are spun through wet spinning, and the hollow fiber membrane is obtained after idle stroke, coagulating bath forming, water washing and drying. According to the invention, polyarylester and polyethersulfone form a bi-component polymer film-forming raw material to prepare the hemodialysis membrane, the raw material ratio and the preparation process are optimized, mutual promotion and synergism of polyarylester and polyethersulfone in the aspect of dialysis performance are realized, and the cost is reduced.

The application discloses a kind of hydrophilic polyvinylidene fluoride oil-water separation membranes and preparation method thereof, belong to oil-water separation membrane technical field.The preparation method steps include: with 2,2-dimethoxy-2-phenyl acetophenone as photo initiator, 3,6-dioxane-1,8-octane dithiol and polyethylene glycol diacrylate as modifier, by photo initiation mercapto-olefin gradually polymerization method is modified to alkali treated PVDF membrane, and hydrophilic polyvinylidene fluoride oil-water separation membrane is prepared.The application is grafted to PVDF separation membrane surface by photo initiation mercapto-olefin gradually polymerization method, and hydrophilic separation membrane is obtained.The preparation method provided by the application has the characteristics of simple process, low cost and the like, and the prepared hydrophilic membrane can be further developed and utilized as sewage treatment separation membrane, hemodialysis membrane.

The present disclosure relates to a membrane with significantly increased selectivity for use in hemodialysis applications, wherein the membrane is coated with chondroitin. The membrane can be obtained by contacting a base membrane, which for example comprises a blend of i) a polysulfone, polyethersulfone or polyarylethersulfone and ii) polyvinylpyrrolidone, to a solution of chondroitin followed by e-beam radiation. The disclosure further relates to a process for producing the selective hemodialysis membrane, and to a method of increasing the selectivity of a membrane. The disclosure further relates to a filtration / diffusion device comprising such membrane.

The invention discloses a roll type diffusion dialysis membrane assembly and a preparation method thereof. The roll type diffusion dialysis membrane assembly comprises a cylinder body and a U-shaped pipe, the upper end of the straight pipe part of the U-shaped pipe is respectively connected with diffusion liquid and dialysis liquid inlet and outlet pipes; wherein an ion exchange membrane is arranged between a pair of diagonal straight pipe parts, two sides of the ion exchange membrane are respectively provided with a flow channel separation net, and the ion exchange membrane and the flow channel separation nets are tightly attached to each other to be spirally rolled into a barrel by taking the pair of diagonal straight pipe parts as the axis; the wound tail ends of the ion exchange membrane and the runner separation net are respectively fixed on the other pair of straight pipe parts; a space supported by the flow channel separation net forms a fluid channel and is always positioned on two sides of the ion exchange membrane, one side forms a diffusion liquid flow channel and is communicated with a pair of diffusion liquid inlet and outlet connecting pipes, and the other side forms a dialysate flow channel and is communicated with a pair of dialysate inlet and outlet connecting pipes; according to the invention, the problems of difficulty in arranging a liquid inlet / outlet and low mass transfer efficiency when a plurality of membrane modules with higher integration degree are used for common treatment are solved.

The invention relates to the technical field of boron carbide production, in particular to boron carbide smelting off-gas boron gangue recovery equipment and a recovery method thereof.The boron carbide smelting off-gas boron gangue recovery equipment comprises a horizontal tank body, a separation cavity and a dissolution cavity are formed in the horizontal tank body; a flue gas inlet is formed in the top of the separation cavity, a collecting tank and an isolation cover are arranged at the bottom of the separation cavity, and after settling separation of flue gas and large-particle impurities is conducted in the separation cavity, the isolation cover covers the collecting tank; a dialysis membrane is arranged at a liquid outlet of the dissolving cavity; the centrifugal pump is used for sucking a boron gangue solution for dissolving flue gas in the separation cavity into the dissolving cavity; the filter pressing piece is arranged in the dissolving cavity, and when the filter pressing piece moves towards the dialysis membrane, the boron gangue solution is subjected to filter pressing and dialysis to pass through the dialysis membrane, so that the boron gangue solution is separated from the small-particle impurities. Settling separation and filter pressing dialysis of impurities in the flue gas are sequentially carried out in the separation cavity and the dissolving cavity, the boron gangue solution with the high purity is obtained, the high boron gangue obtaining rate is achieved, environmental pollution caused by boron gangue discharging is avoided, and the boron gangue recycling benefit is improved.

The purpose of the present invention is to provide a dialysis membrane capable of removing CPPs while suppressing a reduction in minerals and capable of being suitably used for blood processing including the adsorption of CPPs. The present invention pertains to a dialysis membrane comprising a hollow fiber membrane or a semipermeable membrane which is a flat membrane, wherein said dialysis membrane is used for blood processing including the adsorption of calciprotein particles which are complexes of calcium phosphate and proteins, and has a compound (A) in which a film-forming polymer constituting the semipermeable membrane has, in a portion other than terminals of a main chain, at least one electron-donating group selected from the group consisting of an amino group, a carboxy group, a phosphoric acid group, a phosphono group, a phosphino group, and a thiol group, and / or has, separately from the semipermeable membrane, at least one electron-donating group selected from the group consisting of an amino group, a carboxy group, a phosphoric acid group, a phosphono group, a phosphino group, and a thiol group.

The invention discloses a protein / polysaccharide composite dialysis membrane based on in-situ loaded lanthanum carbonate and application of the protein / polysaccharide composite dialysis membrane, a lanthanum carbonate loaded protein / polysaccharide composite aggregate is used for modifying a porous filter membrane, and the dialysis membrane with a lanthanum carbonate loaded protein / polysaccharide self-assembled membrane as a compact skin layer and the porous filter membrane as a supporting layer is formed. By integrating a membrane separation mechanism of hemodialysis and an adsorption principle of blood perfusion, the skin layer of the dialysis membrane has molecular sieve separation and chemical adsorption functions, efficient removal of molecular uremic toxins (phosphorus, creatine liver, bilirubin, p-cresol sulfate and indol sulfate) with different sizes is synergistically realized, macromolecular proteins in blood are effectively intercepted by pore size screening, and the dialysis membrane has the advantages of simple structure, low cost and high efficiency. According to the present invention, by using the adsorption effect of the functional group on the surface of the membrane, the high removal rate on the protein-bound urotoxin is achieved, the high removal effect on phosphorus is particularly achieved, the blood compatibility is considered, the large-scale preparation is easily achieved, and the new idea is provided for the development of the high-performance blood purification material.

The invention discloses an electrophoresis and dialysis integrated device, and designs a multistage dialysis and electrophoresis composite separation device driven by an electric field, a separation pool is designed into a plurality of multistage liquid boxes which are mutually independently communicated, and a positive electrophoresis electrode and a negative electrophoresis electrode are oppositely arranged on the inner sides of the outermost side walls of the two liquid boxes on the outermost side of the separation pool. A driving electric field from one end to the other end of the separation tank is formed after electrification, separated dialysis membranes are arranged on the communicating surfaces of every two liquid boxes, the dialysis membranes among the multi-stage liquid boxes are provided with multi-stage apertures according to requirements, charged particles of sample liquid migrate in the direction of the electric field under the action of the electric field, and when the charged particles pass through the dialysis membranes with different apertures, the charged particles are separated from the sample liquid. Molecules larger than the aperture are blocked, and molecules smaller than the aperture can continue to migrate to a next-stage liquid box, so that rapid molecular cascade separation under the driving of an electric field is realized; compared with existing electrophoresis, gel is not used, dyeing is not needed, and a sample is easy to recover; compared with traditional dialysis, the separation speed is greatly increased.

The method of obtaining modified carbon quantum dots by N-substitution of compounds from the coumarin group, consists, according to the invention, in the fact that the carbon quantum dots, obtained by carbonisation of biomass constituting, inter alia, 1 biologically active substance having free carboxyl groups, are modified by the formation of an amide bond in an aqueous medium, under normal conditions, and then purified using dialysis membranes. During grafting, the ratio of dye to EDC is 1 to 1.1. The invention also relates to the carbon quantum dots with a fluorescence emission spectrum in the range 380- 800 nm, obtained by this method.

The invention discloses an extraction method of high-purity glutamic acid, and belongs to the field of monosodium glutamate production industry. The method comprises the following steps: introducing glutamic acid fermentation liquor into an ultrafiltration membrane to obtain clear liquor and thallus concentrated liquor A; the thallus concentrated solution A enters a dialysis membrane to obtain dialysate and a thallus concentrated solution B; carrying out filter pressing on the thallus concentrated solution B to obtain fungi residues and filtrate; merging the filtrate and the thallus concentrated solution A; the dialysate enters a concentration membrane, a concentrated solution and membrane produced water are obtained, and the membrane produced water is dialysis water; the concentrated solution and the clear solution enter a continuous isoelectric crystallizer to be crystallized, and glutamic acid crystal slurry is discharged at the same time for crystallization; performing primary separation to obtain glutamic acid and isoelectric mother liquor A; the isoelectric mother liquor A is subjected to secondary separation, fine glutamic acid crystals and isoelectric mother liquor B are obtained, and the isoelectric mother liquor B enters a sewage treatment procedure; and fine glutamic acid crystals return to the continuous isoelectric crystallizer. The glutamic acid obtained by the method has the advantages of high yield, high product purity, high light transmittance and good color and luster, and is superior to the commonly used'concentration continuous isoelectric crystallization + crystal transformation 'process.

The invention relates to the field of immune assessment, in particular to an end-stage nephropathy dialysis patient immune assessment method, which comprises the following steps: preparing a database for storing assessment scores of various parameters; preparing a convolutional neural network, and collecting immune intensity change data before and after dialysis of a patient population as a training library; immune intensity change data before and after dialysis under experimental conditions are obtained under laboratory conditions, the data under the experimental conditions are input into a convolutional neural network, and the convolutional neural network is used for training according to a preset mixing proportion rule and outputting a dialysis cause compensation function; data such as demographic characteristics, basic diseases, representative immune activation state data, representative immune senescence state data and dialysis frequency of a patient are collected, a total score is calculated based on a database and a dialysis cause compensation function, and the immunocompetence of the patient is evaluated. By adopting the method, the immunocompetence fluctuation caused by imperfect biocompatibility of the dialysis membrane can be compensated in immune assessment.

The invention belongs to the technical field of medical equipment, and particularly relates to a clinical hemodialysis device which comprises a shell and further comprises a dialysis assembly, the dialysis assembly comprises a dialysis membrane and an inner partition plate, the inner partition plate is located on the inner side of the dialysis membrane, the dialysis membrane is located on the inner side of the shell, and the dialysis membrane and the inner partition plate are both polygonal. According to the dialysis assembly, the contact area of blood and dialysate is increased through the dialysis membrane and the inner partition plate, so that the dialysate can be better subjected to material exchange with the blood, and the removal effect of toxins in the blood is improved. The dialysis membrane and the inner partition plate are both polygonal, so that when blood is injected between the dialysis membrane and the inner partition plate, the blood is distributed in a hollow polygonal shape, the contact area between the blood and dialysate can be increased through the polygonal shape, the dialysate can better absorb toxins in the blood, and meanwhile, due to the hollow distribution of the blood, the blood can be effectively absorbed by the dialysate. The situation that blood in the middle cannot interact with dialysate is avoided, and then the blood dialysis effect is guaranteed.

The invention relates to the technical field of polysulfone membranes, and discloses a membrane suitable for blood filtration and a preparation method thereof.The preparation method comprises the steps that 4-[(dimethylamino) methyl] phenol and a chloromethyl polysulfone membrane are subjected to quaternization, then quaternary ammonium salt cations and sodium sulfonate groups of sodium sulfonate propyl tea polyphenol are subjected to electrostatic interaction, and the membrane is obtained; meanwhile, the introduced phenolic hydroxyl group and the phenolic hydroxyl group of the sodium sulfonate propyl tea polyphenol can form interaction such as a hydrogen bond, so that the sodium sulfonate propyl tea polyphenol can be firmly modified on the surface of the polysulfone membrane and is not easy to wash and remove. A large number of hydrophilic quaternary ammonium salt cations and sulfonate anions and a tea polyphenol structure are introduced on the surface of polyarylether, so that the water contact angle, the surface hydrophilicity, the DPPH free radical scavenging rate and the oxidation resistance of the polysulfone membrane are remarkably improved. The prepared membrane suitable for blood filtration has wide application prospects in the aspects of blood filtration dialysis membranes and the like.

The invention discloses a preparation method of a hollow fiber dialysis membrane with precise gradient holes, which comprises the following steps: preparing a spinning solution and 0.1-0.5 wt% of sodium citrate core solution, injecting the spinning solution with the temperature of 50-54 DEG C and the core solution with the temperature of 40-44 DEG C into a spinning head to prepare a hollow fiber prototype, forming an initial fiber in an air section with the temperature of 36-40 DEG C, the RH of 60-70% and the diameter of 600-1000mm, and performing outer coagulating bath treatment at the temperature of 20-24 DEG C and inner coagulating bath treatment at the temperature of 40-44 DEG C to obtain the hollow fiber dialysis membrane with the precise gradient holes. And cleaning, drying, collecting and assembling after drafting. According to the method, the dialysis membrane with the inner diameter of 190-210 mu m, the wall thickness of 35-40 mu m, the inner surface aperture of 3-8 nm, the outer surface aperture of 50-200 nm and the radial aperture gradient larger than or equal to 4.5 nm / mu m is prepared by regulating and controlling parameters such as an air section and a coagulating bath, and the urea clearance rate gt is achieved. The albumin leakage rate is 1t; and the solute removal efficiency and the mechanical strength are balanced.

A process for producing a phenolic monomer product comprising depolymerizing a recycled polymeric material to obtain a depolymerized mixture comprising phenolic monomers and purifying the depolymerized mixture. The polymeric material comprises at least one PAES polymer and at least one additive, and the PAES polymer preferably comprises a backbone comprising at least one sulfone recurring unit, a first end group being a halide, and a second end-capped group, preferably selected from alkoxy groups and / or phenoxy groups. The additive comprises a polyalkylene oxide and / or a polyvinylpyrrolidone (PVP). A purity of at least 95 wt% of phenolic monomers can be achieved in the product. In particular embodiments in which a recycled hemodialysis membrane comprises a polyethersulfone and PVP, a purity of at least 98 wt% based on the total weight of the phenolic monomer product of 4,4'-sulfonyl phenolic monomers can be achieved after depolymerisation and phenolic monomer purification.

The invention belongs to the technical field of medical equipment, and particularly discloses a clinical hemodialysis device and a using method thereof.The clinical hemodialysis device comprises a dialysis box, and a dialysis assembly is arranged on one side of the dialysis box; the dialysis assembly comprises a dialyzer, a liquid inlet pipe, a liquid outlet pipe, a dialysate inlet, a dialysate outlet, a dialysis membrane, an inner partition plate and an adjusting structure. By means of the flow guiding structure, flow guiding can be conducted when blood enters the dialysis cavity, the situation that blood easily flows in a deviated mode after entering the dialysis cavity, so that no blood passes through the surface of a dialysis membrane on one side, the blood and dialysis efficiency is affected is prevented, the treatment duration is shortened, complications are reduced, and the treatment effect is improved by heating the blood. Therefore, the blood is kept at the temperature acceptable by the human body, the comfort of a patient during treatment is improved, and the dialysis treatment is safely and efficiently carried out.

The utility model discloses a difficult-to-break nano dialysis membrane which comprises a cylinder bin serving as a mounting carrier, a first liquid inlet pipe communicated with the interior of the cylinder bin is mounted at the top of the outer side of the cylinder bin, a base is mounted at the inner bottom of the cylinder bin, a discharge pipe is mounted in the center of the base, and a second liquid inlet pipe communicated with the interior of the cylinder bin is mounted at the bottom of the discharge pipe. And the bottom end of the discharge pipe extends to the position below the cylinder bin, and liquid inlet holes are evenly formed in the top of the outer side of the discharge pipe. The internal space of the cylindrical bin is divided into the spiral gap channel through the plurality of groups of stacked nano dialysis membrane tubes, and dialysate flows towards the central position of the cylindrical bin along the spiral gap channel after being injected into the cylindrical bin, so that the flowing path of the dialysate is increased, and the dialysate can flow through the spiral gap channel. Moreover, the effective contact time of the nano dialysis membrane tubes and dialysate is also prolonged, so that the hemodialyzer can realize an expected dialysis effect by using fewer nano dialysis membrane tubes, and the use cost of the hemodialyzer each time is reduced.

This invention discloses a testing fixture for the water contact angle of hollow fiber membranes, including a support assembly, a carrier assembly, an adhesive assembly, a display assembly, and a lifting assembly. The support assembly is symmetrically arranged on both sides, and each of the two sets of support assemblies has a carrier assembly for placing the component on its surface. The carrier assembly has an adhesive assembly for positioning the material on its surface. This invention solves the problem of the lack of an effective method to evaluate the hydrophilicity and hydrophobicity of the inner surface of hollow fiber dialysis membranes by coordinating the components, carrier assembly, adhesive assembly, display assembly, lifting assembly, and stopwatch. The testing method is simple and effective, requiring no special tools or equipment. This testing method and fixture can meet the requirements for rapid evaluation of the contact angle of the inner surface of hollow fiber membranes at the micron level. The testing method is simple, the testing cost is low, and the test results have high reliability. Therefore, it can be used as an evaluation tool for the hydrophilicity and hydrophobicity of the inner surface of hollow fiber membranes.

The present disclosure is generally directed to membrane based electrodialytic desalinators, systems incorporating electrodialytic desalinators, and methods for the selective removal of mobile phase buffer / salt constituents in liquid chromatography that can be used to retain larger charged molecules such as proteins prior to mass spectrometric detection. According to some aspects, systems can include dialysis membranes (DMs) paired with ion exchange membranes (IEMs). The DMs can be in contact with an effluent channel and prevent loss of large charged molecules to the IEMs. Ions can be removed under an applied electric field using electrodes along the flow channel.