52results about How to "Improve anti-pollution performance" patented technology

The invention discloses a hollow fiber membrane module with an anti-pollution function, the anti-pollution hollow fiber membrane module comprises a lower fixed end and an aeration pipe with specific structures, and particularly comprises a sealant layer with an upper surface in a specific shape and a sub-aeration pipe with an upper opening (also called as an aeration hole) in a specific shape; the upper surface of the sealing glue layer is high in the middle and low in the two sides in the extending direction of the sealing glue layer, the upper opening of each sub-aeration pipe is provided with the two ends with different heights, and the outer side of each sub-aeration pipe is lower, so that pollutants are not prone to accumulation on the upper surface of the lower fixing end and the hollow fiber membrane filaments through cooperation of the two ends, and the pollutants fall off outwards more easily; therefore, the pollution resistance of the membrane component is improved.

The invention relates to a polyamide composite membrane containing a middle layer and a preparation method of the polyamide composite membrane. The polyamide composite membrane comprises a polyborosiloxane-based porous polymer substrate, a modified polyimide middle layer and a polyamide separation layer, a modified polyimide intermediate layer is loaded on the surface of the porous polymer substrate, and a polyamide separation layer is loaded on the surface of the modified polyimide intermediate layer. The polyborosiloxane-based porous polymer substrate and the modified polyimide intermediate layer have better compatibility, interface defects can be reduced, the overall performance of the membrane can be improved, moreover, the polyborosiloxane-based porous polymer substrate also has a self-healing characteristic, and after the polyborosiloxane-based porous polymer substrate is damaged, the self-healing property of the polyborosiloxane-based porous polymer substrate is improved. Fractured connection can be repaired without external stimulation (such as light and heat), and self-repairing of the substrate is achieved.

The invention belongs to the technical field of membrane separation, and relates to a preparation method of an efficient antibacterial microfiltration membrane for a biopharmaceutical process, a composite additive system is introduced into a membrane casting solution, a modifier is added, the modifier comprises a composite alcohol pore-foaming agent and an antibacterial agent, the membrane casting solution is coupled, and a high-throughput antibacterial membrane is obtained through cooperation of membrane preparation processes. The antibacterial agent can enhance the effect of the composite alcohol pore-foaming agent, assists in membrane pore size regulation and control and fixes the membrane structure, and through the synergistic effect of the composite alcohol pore-foaming agent and the antibacterial agent, the selective permeability is improved while the microfiltration membrane maintains high antibacterial performance, and selective separation of microorganisms of different sizes is achieved. The membrane is expected to be a potential candidate in a biopharmaceutical sterile filtration process.

The application discloses an ultrafiltration membrane for sewage treatment and a preparation method thereof, and relates to the field of membrane separation technology. The method comprises the following steps: firstly, ZnO@PHEMA-Ag nanoparticles are prepared, and the nanoparticles are pretreated, modified, grafted and loaded with silver nanoclusters; then, maleic anhydride grafted PVDF and modified MXene are prepared; then, a composite casting solution is prepared, and the solution is cast into a film and then immersed into a polyvinyl alcohol coagulation bath containing dimethylformamide to form a film; finally, the finished ultrafiltration membrane is obtained through ultraviolet crosslinking post-processing. The ultrafiltration membrane has excellent anti-pollution performance through functional nanoparticles, substrate modification and process optimization.

The invention belongs to the technical field of silicon carbide flat membranes, and particularly provides a high-electronegativity silicon carbide flat membrane material and a preparation method thereof. The invention relates to a preparation method of a high-electronegativity silicon carbide flat sheet membrane material, which comprises the following steps: mixing phytic acid and an organic solvent to prepare a precursor solution, impregnating a silicon carbide flat sheet membrane substrate with the precursor solution, carrying out a reaction, and carrying out stage heat treatment. The high-electronegativity silicon carbide flat sheet membrane material prepared by the method has high electronegativity in a wide pH range, the water permeation flux is high, and after multiple humic acid pollution-cleaning cycles, the flux attenuation is less, and the anti-pollution performance is good. When silica sol is added into the precursor solution, the electronegativity of the silicon carbide flat sheet membrane material can be further improved, so that the anti-pollution performance of the high-electronegativity silicon carbide flat sheet membrane material is further improved.

The application discloses a preparation method of a high-peeling-strength inner support polyvinylidene fluoride hollow fiber membrane, and comprises the following steps: (1) mixing polyvinylidene fluoride, a hydrophilic pore-forming agent and an organic solvent to obtain a casting solution; (2) coating the casting solution on a modified support tube through a spinning nozzle, then walking vertically downward in the air, and then entering a coagulation bath to be coagulated and formed into a formed piece; and (3) soaking the formed piece obtained in the step (2) in pure water, then placing the formed piece in a mixed liquid of water and glycerol, and then drying to obtain the high-peeling-strength inner support polyvinylidene fluoride hollow fiber membrane. The anti-hook type support tube prepared by using the anti-hook technology has an increased roughness of the surface of the support tube, the casting solution and the support tube can have more contact areas, the adhesion between the membrane layer and the support tube is greatly improved, and the peeling and peeling-off of the membrane layer caused by washing during the operation of a membrane module can be effectively reduced.

The utility model discloses a water treatment system in the field of water treatment, aims at solving the technical problem of reverse osmosis membrane scale, block, system cannot stable operation. The system includes: primary pretreatment unit, primary ultrafiltration device, primary reverse osmosis device, secondary pretreatment unit, secondary ultrafiltration device, secondary reverse osmosis device and tertiary reverse osmosis device, the primary pretreatment unit water connection primary ultrafiltration device water intake, primary ultrafiltration device water access primary reverse osmosis device, primary reverse osmosis device concentrated water end connects secondary pretreatment unit, and the secondary pretreatment unit water is through secondary ultrafiltration device, and the secondary ultrafiltration water end access secondary reverse osmosis device, and its concentrated water finally enters tertiary reverse osmosis device. The utility model can combine and handle the circulating water drainage and the sewage collected in factory area, to realize water resource recovery and minimum wastewater discharge.

This invention relates to a method for preparing electronic-grade hydrofluoric acid. The invention utilizes a microchannel reactor for the fluorine oxidation reaction, significantly reducing fluorine consumption and safety hazards during production. Furthermore, the microchannel reactor enhances the gas-liquid two-phase mass transfer during the oxidation reaction, further improving impurity removal and product quality. The addition of multi-effect distillation to the distillation process not only enables secondary heat utilization but also saves on the use of high-temperature heating media at the bottom of the column, effectively reducing energy consumption. In the modified liquid, DMF serves as the solvent, cobalt nitrate provides cobalt ions, and vinylguanidine provides guanidine functional groups and amino groups. Ammonia and propanethiol are used as plasma gases to introduce amino and thiol groups onto the membrane surface. These groups help improve membrane selectivity, effectively separating metal and non-metal ions, as well as acidic impurities in the raw materials.

The application discloses a method for preparing an antibacterial nanofiltration membrane by using amikacin as a water-phase monomer, and belongs to the technical field of composite nanofiltration membrane preparation. The method uses amikacin as a water-phase monomer and adopts an interfacial polymerization method to prepare an antibacterial nanofiltration membrane (polyamide nanofiltration membrane). The method has the advantages of simple operation, mild reaction conditions and relatively low raw material cost. In addition, the prepared polyamide composite nanofiltration membrane has higher selective permeation performance and good antibacterial performance. The nanofiltration membrane flux can be as high as 20 L / (m 2 ·h·bar), and the tetracycline rejection rate can be as high as 99.3%. In addition, the application can also provide a reference for the preparation of other antibacterial interfacial polymerization separation membranes.

This invention belongs to the field of electrochemiluminescence materials technology, and discloses a gold-silver nanocluster, its preparation method, and its application in the electrochemiluminescence-electrochemical dual-mode detection of chloramphenicol. The preparation method involves adding a silver source solution to a gold source solution, then adding an alkaline thiol β-cyclodextrin solution to obtain a mixed solution. Sodium bicarbonate is added to adjust the pH to 8.2-8.4, followed by incubation to obtain a crude product of gold-silver nanoclusters. The crude product is then purified by centrifugation and dialyzed to obtain the gold-silver nanoclusters. Furthermore, this invention uses these gold-silver nanoclusters as an ECL luminescent material to construct a sensor and applies it to the quantitative detection of chloramphenicol. This sensor innovatively achieves synergistic detection of ECL and DPV dual signals, with mutually verifiable detection results, exhibiting high sensitivity, excellent selectivity, good stability, and excellent repeatability.

The application belongs to the technical field of MOF membrane and specifically relates to a Cu-BTC / cellulose composite-based MOF membrane and a preparation method thereof. After Cu-BTC / cellulose composite material is prepared by coating microcrystalline cellulose with Cu-BTC, the Cu-BTC / cellulose composite material is mixed with a membrane preparation mother liquor, a pore preparation agent and a homogeneous membrane material to form a homogeneous casting solution, and then the Cu-BTC / cellulose composite-based MOF membrane is prepared after coating, winding, solidification and drying. The Cu-BTC / cellulose composite material prepared by the application has a sub-micron rough surface and an elongated fibrous structure, and the MOF membrane prepared therefrom has more abundant pore and channel structures, which is beneficial to increasing the accessibility of active sites and greatly improving the gas permeability and gas separation performance of the membrane.

The invention discloses an underwater superoleophobic alumina ceramic microfiltration membrane as well as a preparation method and application thereof, and belongs to the technical field of inorganic ceramic microfiltration membranes and preparation thereof. The problem that an existing aluminum oxide ceramic membrane is not resistant to oil pollution is solved. The nano silicon dioxide is added into an aluminum oxide ceramic sintering system, and the aim of regulating and controlling the pore size of the membrane is achieved by adjusting the liquid phase generation amount in the sintering process by utilizing the characteristics that the silicon dioxide generates a liquid phase in the sintering process and wets the surface of an aluminum oxide crystal and activates crystal lattices under the action of capillary force; the aluminum oxide ceramic microfiltration membrane with the characteristics of small pore diameter and large porosity is obtained, the demulsification capability is good, the interception performance on petroleum ether reaches 90% or above, and meanwhile, the pure water flux can reach 1,300 L.m <-2 >. H <-1 >. Bar <-1 >. And the obtained alumina ceramic microfiltration membrane also has underwater super-oleophobicity, the anti-pollution performance of the ceramic membrane in the operation process is improved, and the transmembrane pressure difference in the filtration process is reduced.

The invention discloses a low-static-consumption single-nozzle baffle type pressure servo valve which comprises a sleeve, a coil assembly, a magnet assembly, an armature assembly, a nozzle baffle stage and a slide valve stage. The baffle can be tightly attached to the oil inlet nozzle by adjusting the position of the magnetic gap screw, oil entering from the oil inlet P reaches the front end of the oil inlet nozzle through the main oil filter and is cut off by the baffle, and at the moment, when the servo valve is in a zero-position non-working state, the pilot level almost has no leakage; when a product is in a working state, the number of oil inlet nozzles is reduced by half, and the pilot-stage internal leakage rate is greatly reduced. The anti-pollution capacity of the slide valve stage is obviously improved, and the oil return pressure stability is good.

The invention relates to a functionalized polydopamine modified mixed matrix membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly immersing a mixed matrix membrane into a dopamine solution, then immersing the mixed matrix membrane into a modifier solution for improving hydrophobicity, performing ultrasonic reaction and vacuum drying during immersion, and coating the surface of the mixed matrix membrane with modified polydopamine; the modifying agent is selected from one or more of 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane, 1H, 1H, 2H, 2H-perfluorodecyl trichlorosilane and 1-dodecanethiol, and the modifying agent is selected from one or more of 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane, 1H, 1H, 2H, 2H-perfluorodecyl trichlorosilane and 1-dodecanethiol. Compared with the prior art, the selectivity and stability of the membrane are improved, and the problems of stability and treatment efficiency of the mixed matrix membrane in the separation process are effectively solved.

This invention relates to the field of wastewater treatment technology, specifically to a process and system for removing heavy metals from ink wastewater. It includes the following steps: coagulating ink wastewater with a metal composite coagulant, adsorbing and removing sludge wastewater with an ink sludge-based adsorbent, and filtering wastewater using a catechol-modified polyethersulfone membrane, followed by detection. This invention utilizes high-iron copper slag with titanium tetrachloride and acetylacetone to prepare a metal composite coagulant, transforming the copper slag into a high-value-added water treatment agent. This significantly reduces the production cost of the coagulant. Through the synergistic leaching of dilute sulfuric acid and hydrogen peroxide, the iron element in the copper slag is efficiently extracted and oxidized into Fe, which has a strong coagulation effect. 3+ The trace amounts of copper and other metal ions dissolved also provide a basis for subsequent composite reactions, thus improving the overall treatment efficiency and effluent quality of oily sludge wastewater.

The application relates to an antibacterial and antifouling reverse osmosis membrane and a preparation method thereof, and comprises the following steps: (1) uniformly dissolving a multiacyl chloride group organic compound in an organic solvent, then adding cyclodextrin, and carrying out ultrasonic treatment to obtain a cyclodextrin-organic acyl chloride inclusion compound solution; dispersing antibacterial nanoparticles in water, then adding an amino silane coupling agent, and stirring and dispersing to obtain a functionalized antibacterial nanoparticle suspension with amino groups on the surface; (2) uniformly coating the cyclodextrin-organic acyl chloride inclusion compound solution to one surface of a prefabricated reverse osmosis membrane, removing the excess solution on the surface after standing, and then coating the functionalized antibacterial nanoparticle suspension with amino groups on the surface on the surface with the cyclodextrin-organic acyl chloride inclusion compound, removing the excess solution on the surface after standing, and carrying out thermal drying to obtain the antibacterial and antifouling reverse osmosis membrane. The reverse osmosis membrane has excellent stability, small membrane sheet water flux attenuation, obviously improved antifouling capacity, and excellent antibacterial capacity.

The application discloses a gear box circulating cooling structure and cooling method for torque adjustment, relates to the field of gear box application, and comprises a base, the top of the base is provided with an input shaft, an output shaft, an intermediate shaft and a gear set, the outside of the input shaft, the output shaft and the intermediate shaft is provided with an oil injection assembly, the top of a middle cover is provided with an upper cover assembly, and the bottom of the upper cover assembly is provided with an oil sprinkling plate. The application sets two lubricating modes of lubricating oil sprinkling and lubricating oil spraying, can lubricate gears in different rotating speed stages, improves lubricating efficiency, when the gear box is cold started or driven at low speed, the oil sprinkling plate is used for oil sprinkling, when the rotating speed of the gear box increases, the centrifugal force of the oil injection assembly increases, the oil injection assembly is opened, and the lubricating oil is synchronously sprinkled and sprayed, and the sprayed lubricating oil is inclined, so that the lubricating oil can be better sprayed to the gear end face.

The invention relates to the technical field of hydraulic systems of engineering machinery, and discloses a compact load-sensitive proportional valve of an integrated hydraulic lock, which comprises an oil inlet body and a reversing body which are fixedly connected through a bolt. A main valve element is installed in the middle of the oil inlet body in a sliding mode, a pressure adjusting plug screw, a flow dividing spring, an unloading valve assembly and other components are arranged, the opening pressure can be adjusted, and overpressure unloading is achieved. A hydraulic lock assembly and a pressure compensation valve element are arranged in the reversing body and are designed in a coaxial nesting mode, and a valve element of the hydraulic lock assembly is of a double-conical-face structure. A control oil way is communicated with a main valve element displacement cavity to achieve linkage unlocking, and a load pressure feedback channel is isolated from a control channel through an independent spiral oil channel. A micro filter is arranged at an inlet of the hydraulic lock control oil duct and used for preventing pollution. The invention has the advantages of compact structure, strong anti-pollution capability and fast dynamic response, can realize the accurate matching of a pump valve system and load pressure flow, and is suitable for the control of actuating mechanisms of engineering machinery such as tractors, cranes and the like.

The invention discloses an in-situ coupling synergistic hardness removal and resource utilization process. The process comprises a hardness removal process section and a concentration and salt separation process section, the hardness removal process section comprises a hardness adsorption module, an analysis module and a calcium recovery module; the hardness adsorption module is composed of hardness adsorption assemblies and is filled with a functional adsorbent, the analysis module is used for recovering the performance of the adsorbent of the hardness adsorption module, and the calcium recovery module is used for treating analysis waste liquid generated by the analysis module and the hardness adsorption module; salt extracted in the concentration and salt separation process section is used as a resolving agent in the hardness removal process section; the method comprises the following steps: extracting alkalinity ions from raw water, using the alkalinity ions as a precipitating agent, treating the hardness extracted by a hardness adsorption module through a calcium recovery device, recycling calcium ions, further treating the hardness in the raw water by using ions in the raw water, and realizing the purpose of no addition of chemicals, and the method is a mutual coupling and cooperative treatment process, which couples an adsorption technology and a salt separation purification technology for the first time; and by cooperating with a particle membrane filtration technology, the technological process is shortened, and waste resource utilization is realized.

This invention belongs to the field of sandpaper production technology, specifically relating to a lamination and packaging system and method for dust-free ceramic dry sandpaper. The invention features a pre-assembly mechanism, a sandpaper feeding mechanism, a release liner feeding mechanism, and a lamination and packaging mechanism working collaboratively. The sandpaper and release liner feeding mechanisms respectively achieve precise, non-adhesive, and quantitative material delivery in a single layer, with precise material alignment achieved through a positioning structure. The pre-assembly mechanism utilizes vacuum adsorption and mechanical pressure to pre-assemble the double-layer sandpaper with the release liner, avoiding direct friction damage to the abrasive layers. The lamination and packaging mechanism employs a circumferential ring-shaped film formed by adhesive coating and curing. This invention effectively solves the problems of sandpaper shedding, scratches, and dust accumulation during the packaging process of high-hardness ceramic abrasive sandpaper, ensuring the performance of dust-free sandpaper, significantly reducing the cost of lamination and packaging consumables, and offering high efficiency and excellent alignment accuracy in automated assembly and lamination operations. It is suitable for the standardized mass production of high-precision dust-free ceramic dry sandpaper.

The utility model discloses a novel detachable efficient heat and mass transfer air sweeping type membrane distillation component which comprises a shell and a conveying pipeline, a membrane component is arranged on the inner side of the shell, a PTFE membrane and a silica gel gasket are arranged on the membrane component respectively, a plurality of sets of screws are arranged at one end of the membrane component, and air sweeping cavities are formed in the two sides of the top of the membrane component; according to the utility model, air sweeping type membrane distillation is adopted, so that the membrane flux and the distillation efficiency are effectively improved while the mass transfer resistance in the treatment process is reduced; in the distillation process, the hot test feed liquid does not make direct contact with the membrane, the probability and risk of membrane pollution are reduced, the anti-pollution capacity of the membrane is improved, the PTFE membrane is adopted, the product has excellent chemical stability and corrosion resistance, the anti-pollution capacity of the membrane can be effectively improved, the service life of the membrane can be effectively prolonged, and the product has high porosity and high flux and is suitable for industrial production. High-flux filtration or separation is realized, and the production efficiency is improved.

The application belongs to the field of membrane separation materials, and discloses a visible light catalytic self-cleaning oil-water separation membrane and a preparation method and application thereof, and comprises the following steps: 4-cyanopentanoic acid dithiobenzoate is used to prepare an alkyne functionalized RAFT reagent; the alkyne functionalized RAFT reagent is grafted on the polymerization chain of azidation polyether sulfone through a click chemistry reaction to obtain a RAFT reagent functionalized polyether sulfone polymer; based on the RAFT reagent functionalized polyether sulfone polymer, a PES / PES-CPPA membrane is prepared through a non-solvent induced phase separation method; a hydrophilic zwitterion PSBMA is modified on the surface of the PES / PES-CPPA membrane through a RAFT polymerization method to obtain a super-hydrophilic / underwater super-oleophobic membrane; Fe 3+ The super-hydrophilic / underwater super-oleophobic membrane is subjected to complex treatment to obtain the visible light catalytic self-cleaning oil-water separation membrane; and the application significantly improves the stability and effect of the membrane material in long-term use.

The present invention discloses an enhanced hydrophobic polypropylene hollow fiber composite membrane and a preparation method thereof. The method comprises: (1) providing a casting solution containing polypropylene, a hydrophobic additive, an emulsifier and a diluent; (2) using a concentric circle composite spinning method to allow the casting solution to be bonded to the outer surface of a tubular reinforcing body. The method can effectively improve the hydrophobicity of the polypropylene hollow fiber composite membrane and improve its mechanical properties, so that the obtained hollow fiber composite membrane can meet the needs of application scenarios such as oil-water separation.

The invention relates to the technical field of charged particle beam control, and discloses an electrostatic deflector for a focused ion beam and an assembly process thereof, the electrostatic deflector comprises an electrode assembly, a mounting flange, an insulation structure and a positioning structure; an upper electrode and a lower electrode of the electrode assembly are correspondingly arranged; part of the upper electrode is embedded into the mounting flange; the insulating structure is arranged on one side, far away from the upper electrode, of the mounting flange, and part of the lower electrode is embedded into the insulating structure; the positioning structure sleeves the lower electrode; the thermal expansion coefficient of the electrode assembly is A, the thermal expansion coefficient of the insulation structure is B, and 1 < = A / B < = 1.5. The proportional relation between the thermal expansion coefficients of the electrode assembly and the insulation structure is limited, the thermal expansion coefficients of the electrode assembly and the insulation structure are matched, the deformation quantity difference of the electrode assembly and the insulation structure under the extreme working condition is reduced, thermal stress cracking is avoided, and the assembly precision and structural integrity of the electrode assembly and the insulation structure are maintained; the electric field is distributed according to design, and distortion is avoided.

The invention discloses a power plant boiler water treatment application method and system based on a WTC reverse osmosis process. The method comprises the following steps: constructing a WTC reverse osmosis process concentrated water treatment system architecture; collecting a plurality of groups of concentrated water based on big data for detection and analysis, obtaining various ion concentrations, organic matter contents, microbe quantity and activity data parameters, and constructing a concentrated water quality analysis data set; constructing a local concentrated water information database, comparing the local concentrated water information database with data parameters in a concentrated water quality analysis data set, screening to obtain differentiated water quality parameters, and determining an expected processing target; according to an expected treatment target, the type selection and arrangement scheme of special membrane elements are determined, a WTC reverse osmosis process concentrated water treatment system architecture is correspondingly planned, the expected treatment target is monitored, regulated and controlled, and a regulation and control result is recorded in real time so as to adaptively adjust the expected treatment target. The technical problems that in the prior art, due to water quality difference, a membrane element is low in anti-pollution capacity, prone to blockage and short in service life are solved.

The invention relates to a microbial separation device and a separation method. The microbial separation device comprises a shell and a separation cylinder arranged in the shell, a cleaning mechanism for cleaning the inner wall of the shell is arranged on the shell; the cleaning mechanism comprises an annular outer plate rotationally arranged on the shell, a plurality of connecting pins distributed in the circumferential direction are fixedly connected to the inner side of the annular outer plate, and an annular guide groove and an offset guide groove communicating with the annular guide groove are formed in the side, facing the connecting pins, of the annular inner plate; a V-shaped connecting rod is hinged to each connecting pin, a rolling wheel is rotationally connected to each V-shaped connecting rod, and the rolling wheels are contained in the annular guide grooves or the offset guide grooves and can roll in the annular guide grooves or the offset guide grooves. The independent low-speed driving mechanism is arranged, so that the scraping plate can be driven to perform continuous and circumferential scraping cleaning on the inner wall of the shell while the separation barrel performs high-speed centrifugal operation, and the mechanism ensures that splashing liquid drops are immediately scraped, guided and collected before the splashing liquid drops are not attached and dried.

The application discloses a kind of thin layer nanocomposite membranes and its preparation method and application, belong to membrane separation technical field.The method first polyamino monomer and 2,4,6-triformylphloroglucinol in organic solvent are catalyzed polymerization, and covalent organic polymer nanoparticles are prepared;Subsequently, the nanoparticles are reacted with sodium alginate to obtain hydrophilic modified nanoparticles;Finally, the modified particles are added to the aqueous phase, and the organic phase is interfacially polymerized and heat treated on the substrate to obtain a thin layer nanocomposite membrane.The application constructs a hydrophilic network and a charged nanopore, significantly improves the permeation flux of the membrane, while maintaining a high rejection rate for divalent salt, achieving the synergistic optimization of high flux and high ion selectivity, and can be applied to water treatment, desalination, magnesium-lithium separation and other fields.

The invention relates to the field of heparin lithium, in particular to a preparation process of a heparin lithium solution, and solves the problems of low product purity, easy resin pollution, low activated carbon separation efficiency and the like in the traditional process. A high-purity pretreatment solution is obtained through raw material pretreatment, impurity adsorption by composite activated carbon and magnetic separation, efficient lithium ion replacement is achieved through double modified resin, elution parameters are accurately controlled to enrich products, micromolecular impurities are removed through ultrafiltration concentration and dialysis bag desalination subsequently, and finally the sterility of the products is guaranteed through high-pressure steam sterilization. Finally obtaining a heparin lithium solution; the dual modified resin improves the lithium ion selectivity and enhances the pollution resistance; the active carbon composite modification realizes high-efficiency removal and rapid separation of impurities, and reduces the loss of heparin sodium; protein pigment impurities are removed through modification of the heparin sodium, resin adsorption loss is reduced, and finally, the quality of the heparin lithium solution product is remarkably improved, the recovery rate is greatly increased, the production efficiency is optimized, and the process stability is enhanced.

The invention relates to the technical field of ultrafiltration membranes, in particular to a bundle tube type external pressure ultrafiltration assembly which comprises a plurality of bundle hollow tubes arranged side by side and further comprises membrane wire integrated bundles, a liquid collecting assembly and a flow dividing assembly, one membrane wire integrated bundle vertically penetrates through each bundle hollow tube, and the liquid collecting assembly and the flow dividing assembly are arranged side by side. The lower end of the bundling hollow pipe extends into the stock solution shunting cavity and is fixedly connected with the shunting assembly; sewage is shunted into the plurality of bundled hollow pipes through the shunting assembly, the sewage is filtered through the membrane wire integrated bundles in each bundled hollow pipe, and the hydraulic conditions of the membrane wire integrated bundles are relatively consistent under the guide action of the bundled hollow pipes, so that the membrane wire integrated bundles are uniform in water permeation, and the surfaces of the membrane wire integrated bundles are not easy to harden and hang mud; the problems of silting and blocking are not easy to occur, the anti-pollution performance of the assembly can be effectively improved, and the problem that silting and blocking are easy to occur among membrane wires in the operation process of the existing external pressure type ultrafiltration membrane is solved.

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