2515results about "Ultrafiltration" patented technology

The invention provides a virus-removing ultrafiltration membrane and a preparation method thereof, and belongs to the technical field of membrane separation. According to the preparation method of the ultrafiltration membrane, a hydrophilic polymer and a bulk polymer are blended to prepare a membrane casting solution, the ultrafiltration membrane is prepared on the basis of a double-layer homogeneous compounding method and a phase inversion method, and the obtained integrated ultrafiltration membrane comprises a separation layer with a compact skin layer and a pre-filtration supporting layer with a complete sponge structure, and provides high mechanical strength and toughness at the same time; the separation layer and the supporting layer form a hourglass-shaped structure with effective aperture continuously changing in a gradient mode, and no obvious interface or layering phenomenon exists. The ultra-filtration membrane is clear in gradient structure, the upper surface is loose, the lower surface is compact, the structures are fused more tightly, no obvious interface exists, the filtration resistance is reduced, and the protein permeability is improved. And the flux and the maximum treatment volume are improved and the treatment time is shortened while the relatively high virus rejection rate and the relatively low protein adsorption capacity are maintained.

The invention discloses a purification device for aquaculture wastewater, and relates to the technical field of wastewater purification. Comprising a box body as well as a physical filter tank and a biochemical bacterium culture tank which are arranged in the box body, and further comprises a microfiltration assembly arranged in the physical filter tank, the microfiltration assembly comprises a filter cartridge rotationally connected to the interior of the physical filter tank, a backwashing pipe is fixedly connected to the interior of the physical filter tank, and a sewage collecting tank is arranged in the filter cartridge; a cleaning assembly matched with backwashing to improve the cleaning effect of the filter cartridge is arranged in the filter cartridge, the cleaning assembly comprises a floating plate arranged in the filter cartridge, a connecting rod slidably penetrates through the floating plate, and the upper end of the connecting rod penetrates through the dirt collecting tank and is fixedly connected with a first cleaning brush; stubborn attachments such as mycoderm and caustic soda attached to the inner wall of the filter cartridge can be brushed off by utilizing the first cleaning brush, and the cleaning effect on the filter cartridge can be improved by matching with backwashing, so that the attachments on the inner wall of the filter cartridge can be massively washed off, the backwashing period is shortened, and the blockage probability of the filter cartridge is reduced.

The invention discloses a desalting membrane as well as a preparation method and application thereof, and relates to the technical field of membrane separation. The desalting membrane comprises a porous ultrafiltration base membrane and a functional layer formed on the surface of the porous ultrafiltration base membrane; the functional layer is formed by copolymerizing and cross-linking a polyamine monomer, a zwitterionic multi-element hydroxyl monomer and an acyl chloride monomer through an interfacial polymerization reaction. The preparation method comprises the following steps: providing the porous ultrafiltration base membrane; coating the surface of the porous ultrafiltration base membrane with an alkaline water-phase solution containing a polyamine monomer and a zwitterionic multi-hydroxyl monomer to form a water-phase solution layer; coating an oil-phase solution containing an acyl chloride monomer on the surface of the water-phase solution layer to form a functional layer; and performing heat treatment. The invention also provides application of the desalination membrane in any one of seawater desalination, brackish water desalination, wastewater treatment and material separation and concentration. According to the invention, zwitter-ion-based multi-hydroxyl monomers are introduced into water-phase monomers to participate in interfacial polymerization, and a super-hydrophilic nano-channel is constructed in a separation layer, so that the water flux and the desalination rate of the membrane are remarkably improved.

Disclosed herein is a catalytic comprising a hexacyano metal compound; wherein the hexacyano metal compound comprises a metal selected from the group consisting of cobalt, iron, copper, manganese, nickel, zinc, and combinations thereof; wherein the hexacyano metal compound comprises coordinatively unsaturated metal (II)—N—C centers for; and wherein the hexacyano metal compound is anchored onto an inorganic substrate. Also disclosed are a system including the catalytic material and a process for treating wastewater using the catalytic material.

The utility model discloses a white spirit upgrading ultrafiltration device, and particularly relates to the technical field of white spirit production equipment, the white spirit upgrading ultrafiltration device comprises a filter bin, the middle part of the filter bin extends to the lower end and is symmetrically provided with residue discharge grooves, the output ends of the residue discharge grooves are connected with sealing blocks in a sliding manner, and a motor is fixedly connected below the inner cavity of the filter bin; a transmission structure is fixedly connected to the outer surface of the output end of the motor, a knocking structure is fixedly connected to the right side of the upper portion of the transmission structure, a sweeping structure is fixedly connected to the upper portion of an inner cavity of the filtering bin, and an ultrafiltration membrane is rotationally connected to the middle of the inner cavity of the filtering bin. According to the Baijiu upgrading ultrafiltration device disclosed by the utility model, the ultrafiltration membrane is matched with the sweeping structure and the residue discharge groove, so that impurities and suspended matters filtered by the ultrafiltration membrane can be swept and fed into the residue discharge groove in time, the Baijiu filtering quality is improved, the sweeping structure does not influence the Baijiu filtering in the filtering process, and the filtering speed is also improved; and due to automatic cleaning, the manual labor is reduced.

An apparatus and a method are provided for a mobile reservoir system to provide potable water to desired destinations. The mobile reservoir system includes a waterborne vessel that includes a cargo hold. A collection unit comprised of a material for safe and sterile storage of potable water is disposed in the cargo hold. One or more collectors channel rainwater into the collection unit. Each collector is a sheet of a non-porous material supported on a retractable frame and a plurality of support arms. The sheet provides a surface area for collecting rainwater. A porous material covers the collection unit and operates as a filter for collected rainwater. A retractable cover may be extended over the cargo hold to provide protection to the collected rainwater in the collection unit. A filtration system is configured to offload the rainwater as potable water.

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 present invention relates to a modular and scalable system for intelligent vertical farming infrastructure, using the latest in water recycling sciences, and artificial-intelligence based automation. This helps to combat the issue of sustainable Agriculture+its minimizing usage of water, energy, and space. It combines a vertical farming structure with multiple levels of cultivation with an irrigation and drainage system to achieve recirculation of water. The water recycling unit consists of rainwater harvesting, wastewater collection and multi-stage treatment subsystems, which can guarantee a continuous supply of high-quality recycled water for irrigation. The invention also combines a network of Internet of Things (IoT)-enabled sensors and AI-based control circuitry to track and manage environmental conditions (e.g. light intensity, humidity, temperature, and nutrient levels).

A fluid filtration system includes a fluid storage vessel such as a bioreactor, a filter housing including a filter element disposed therein, a pump coupled between the fluid storage vessel and the filter housing, and a flow diverter disposed between the pump and the filter housing. The pump is configured to move fluid from the fluid storage vessel through the filter element, and the flow diverter is configured for selectively directing fluid received from the pump to the first or second end of the filter housing. In a first mode of operation, the flow diverter directs flow through the filter housing in a first direction, while in a second mode of operation, the flow diverter directs flow through the filter housing in a second direction opposite the first direction.

The utility model discloses an automatic cleaning purifier and relates to the technical field of purifiers. The purifier with the automatic cleaning function comprises a purifier base, a filter bottle is arranged at the top of the purifier base, a mounting mechanism is arranged at the top of the filter bottle, and a filtering mechanism is arranged in the filter bottle. According to the purifier with the automatic cleaning function, by arranging the connecting rod main body, when membrane filaments need to be cleaned, firstly, the output end of the motor main body is controlled by the control panel to drive the connecting rod main body fixedly installed on the motor main body to rapidly rotate forwards and backwards, and at the moment, a fixing rod fixed to the top of the connecting rod main body through a fixing head, a filter element head and the membrane filaments rapidly rotate forwards and backwards; the multiple scattered membrane filaments are arranged so that mutual friction force can be generated when the membrane filaments are scattered and rotate in the cleaning process, wrapping objects on the surface can be rubbed off through the friction force, the cleanliness during rotary cleaning is improved, and the membrane filaments can be conveniently cleaned through the device.

To prevent degradation or breakage of an ultrafiltration membrane caused by steam disinfection treatment.SOLUTION: A water treatment device 1 comprises a plurality of ultrafiltration membrane devices 10, 20 each having at least one ultrafiltration membrane module 11-13, 21-23, and steam introduction means L20 that introduces steam in parallel to the plurality of ultrafiltration membrane devices 10, 20.SELECTED DRAWING: Figure 1

The direct drinking water system comprises a pretreatment device, a membrane treatment device, a finished product water tank, a cleaning device, a water supply branch and a water return branch, the cleaning device comprises a concentrated water tank, a gas-liquid mixing branch, a bypass pipeline, a pulse water supply branch, a cleaning main pipe, a forward washing branch, a backwashing branch and a lower opening sewage branch. According to the utility model, quick switching in the cleaning process of the hollow fiber membrane is realized, the highest and lowest pressurization values in each period are accurately controlled, and meanwhile, adverse effects on membrane water production caused by water production of a water hammer and an air hammer are avoided; the pulse type positive and back washing is combined, so that the membrane pollutants are removed more thoroughly; according to the device, ozone microbubbles of a cleaning medium are exploded, so that the pollutant removal capacity is also improved; and when the filtered water in the finished water tank is stored for a long time, the ozone aeration device can also be used for sterilizing the filtered water, so that the application range of the device is expanded, and the safety of direct drinking water is guaranteed.

The invention relates to the technical field of sewage filtering, in particular to an ultrafiltration membrane sewage filtering device which comprises a shell unit and a filtering unit. Wherein the shell unit comprises a shell body, an upper cover and a lower cover, the two ends of the shell body are open, the upper cover and the lower cover are arranged at the two ends of the shell body respectively, the upper cover is communicated with a purified water outlet pipe, and the shell body is communicated with a flushing pipe. According to the invention, the cleaning process is carried out by stages from low-flow-speed water flow flushing to cleaning ring brushing driven by the axial flow blades, to deformation and flushing of the ultrafiltration membrane filaments through up-down movement of the outer shell, and finally, the deformed and diffused ultrafiltration membrane filaments are flushed in combination with the water flow; by means of the series of steps, it is guaranteed that the ultrafiltration membrane filaments can be comprehensively and deeply cleaned, water flow with high flow speed and high water pressure is prevented from being used in the whole cleaning process, possible damage to the ultrafiltration membrane filaments is effectively prevented, and the service life of the ultrafiltration membrane is prolonged.

A method of preparing a polyamide membrane with multi-level pore structure mediated by protein fiber network includes the steps of: preparing protein fiber; quenching and carrying out dialysis; loading protein fiber network on ultrafiltration membrane; preparing aqueous and organic phase solutions; and carrying out interfacial polymerization, which can solve the problems of the integrity and separation performance of the polyamide layer being affected by low porosity of the base membrane and uneven distribution of amine monomers. The polyamide membrane prepared by the method of the present invention greatly improves the water flux while ensuring a high salt rejection rate. At the same time, the introduction of the protein fiber network also enhances the mechanical strength and anti-pollution ability of the membrane.

Algae harvesting and cultivating systems and methods for producing high concentrations of algae product with minimal energy. In an embodiment, a dead-end filtration system and method includes at least one tank and a plurality hollow fiber membranes positioned in the at least one tank. An algae medium is pulled through the hollow fiber membranes such that a retentate and a permeate are produced.

A membrane fouling monitoring and analysis system may be used on a food and beverage membrane operated over a plurality of production periods separated by daily clean-in-place cleanings. In some examples, the system receives data indicative of a flow of one or both of a permeate stream and a retentate stream of the membrane during the plurality of production periods and determines a trend of at least one parameter associated with the data to provide a determined trend. The system may compare the determined trend to a baseline fouling trend and determine if and / or when to perform a deep cleaning on the membrane based on comparison. The system may subsequently execute the deep cleaning on the membrane at the scheduled time.

The invention relates to the technical field of mine water treatment, in particular to a mine water filtering device.According to the mine water filtering device, an ultrafiltration membrane assembly is arranged in a membrane pool to filter mine water, a pressure detector is arranged at a liquid outlet to monitor the water pressure in real time, and the pressure detector transmits real-time data to a controller; the controller is used for judging whether the water pressure entering the clean water tank meets the water production requirement or not, and automatically controlling the starting and stopping of each electrical device according to the judgment result, so that the spraying pump and the moving assembly are started in time when the membrane pollution problem occurs, and the clean water in the clean water tank is pumped to the spray head through the water production pipeline to clean the ultrafiltration membrane assembly; and different positions of the ultrafiltration membrane assembly are cleaned by moving the spray head through the moving assembly, so that pollutants on the surface of the ultrafiltration membrane can be quickly and thoroughly removed, and the water production efficiency is ensured. And moreover, the device does not need to add a coagulant to carry out flocculation and sedimentation treatment on the mine water, so that potential risks of drug residues on subsequent recycled water quality are avoided.

The application discloses a preparation method of a hydrophilic oil-water separation anti-pollution membrane and the anti-pollution membrane and application thereof, and prepares MNRs material; the MNRs material is dispersed in dimethylacetamide, is uniformly stirred, polyvinylpyrrolidone is added, and stirring is continued, and a first mixture is obtained through ultrasonic treatment; the first mixture is mixed with polyvinylidene fluoride to obtain a second mixture, and the second mixture is stirred; the treated second mixture is dip-coated on a carrier, the dip-coated carrier is treated in deionized water to obtain an ultrafiltration membrane; the ultrafiltration membrane is soaked in a tea polyphenol solution with a Tris-HCl buffer solution, and is shaken to obtain the hydrophilic oil-water separation anti-pollution membrane. The hydrophilic oil-water separation anti-pollution membrane has excellent separation efficiency and flux recovery rate for four different oil-water mixtures of kerosene, gasoline, edible oil and n-hexane. The preparation process of the oil-water separation membrane is simple, the cost is low, and the reaction condition is mild; when the oil-water separation membrane is applied to organic wastewater separation, the oil-water separation membrane has the advantages of high efficiency, good removal performance and good recycling performance.

The invention provides a degradation regeneration method of a waste reverse osmosis membrane, which comprises the following steps: cleaning the waste reverse osmosis membrane, fixing the waste reverse osmosis membrane in a flat state, and carrying out plasma treatment to obtain a degradation regeneration membrane. According to the regeneration method provided by the invention, the form of the polymer on the surface of the waste reverse osmosis membrane is regulated and controlled through the physical, chemical or physicochemical synergistic etching effect of the plasma, the waste membrane is converted into the nanofiltration membrane or the ultrafiltration membrane, meanwhile, compared with a commercial nanofiltration membrane or ultrafiltration membrane, the interception capacity of inorganic ions is improved, and in the treatment process, the treatment efficiency is improved. No chemical reagent is used, the process is simple, the treatment time is short, and the regeneration efficiency of the waste reverse osmosis membrane is greatly improved.

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 a water treatment and membrane separation technology, and provides an integrated catalytic separation membrane, a preparation method thereof, and a water treatment method and system. According to the membrane, polyvinylidene fluoride is used as a continuous phase to form a porous matrix, and cerium dioxide is embedded and fixed in a mode of uniform dispersion in a membrane body in a phase inversion membrane forming process; in the presence of illumination and peroxysulfate, active species are generated through in-situ activation on a membrane-water interface, and membrane separation is completed synchronously. The water treatment method comprises the following steps: adding peroxymonosulfate or peroxydisulfate into a water body to be treated, and filtering through the membrane under illumination; the photothermal effect generated by organic matter degradation intermediates in operation inhibits membrane pollution and maintains flux. According to the invention, short-range coupling of active sites and mass transfer channels is realized, the medicament and energy utilization rate is improved, the coating stripping and metal dissolution risk is reduced, and the method is suitable for drinking water pretreatment, reclaimed water deep treatment and treatment of water containing natural organic matters / humic acid.

The invention discloses a ZnO / PES mixed matrix ultrafiltration membrane and a polyaniline-ZnO / PES mixed matrix nanofiltration membrane as well as a preparation method and an application of the ZnO / PES mixed matrix ultrafiltration membrane and the polyaniline-ZnO / PES mixed matrix nanofiltration membrane. PES is used as an organic polymer, PEG1500 is used as a pore-foaming agent, ZnO is used as a nano filler, and the ZnO / PES composite ultrafiltration membrane is prepared through a non-solvent induced phase inversion method. The preparation method comprises the following steps: synthesizing a polyaniline coated ZnO nano composite material, blending zinc nitrate hexahydrate in ammonia water with a polyaniline solution to form a nano composite structure, and preparing the polyaniline-ZnO / PES mixed matrix nanofiltration membrane by taking the synthesized nano composite particles as a filler. According to the mixed matrix membrane technology, alkali and lignin in the black liquor can be directly recovered, compared with alkali recovery through a combustion method, the mixed matrix membrane technology has the advantages of being easy to operate, not complex in process, low in investment cost, small in occupied area, low in energy consumption, good in environmental compatibility and the like, and meanwhile subsequent high-valued comprehensive utilization can be conducted on lignin.

The invention discloses efficient energy-saving reciprocating type integrated ultrafiltration equipment which comprises an ultrafiltration membrane group box body and a circulating pipeline, the ultrafiltration membrane group box body internally comprises a plurality of membrane assembly membrane collecting frames, and a driving assembly for driving each membrane assembly membrane collecting frame to synchronously reciprocate is arranged behind each of two sides of the top of the ultrafiltration membrane group box body. According to the efficient energy-saving reciprocating type integrated ultrafiltration equipment, reciprocating motion of the low-power motor is adopted as an anti-pollution measure of the ultrafiltration membrane, operation energy consumption is effectively reduced, meanwhile, the efficient energy-saving reciprocating type integrated ultrafiltration equipment is matched with a high-quality ultrafiltration membrane material, so that the efficient energy-saving reciprocating type integrated ultrafiltration equipment has high filtering efficiency, a water treatment task can be rapidly completed, and the water treatment efficiency is improved. And the requirements of modern industrial production on high efficiency, energy conservation and environmental protection are met.

A membrane a feed flow inlet, a retentate flow outlet and a permeate flow outlet. The membrane further includes a membrane interface portion comprising a plurality of feed flow channels fluidly connected to the feed flow inlet and to the retentate flow outlet, and a plurality of permeate flow channels fluidly connected to the permeate flow outlet, wherein the membrane interface portion is operable to allow for fluid communication between the feed flow channels and the permeate flow channels through a membrane portion. The membrane interface portion includes a reduction in a dimensional property from toward the feed flow inlet to toward the retentate flow outlet so that the membrane interface portion is operable to produce a higher cross-flow velocity at the membrane portion toward the retentate flow outlet. Also provided is a water treatment module including the membrane and a process for making the membrane.

The invention relates to the technical field of nutrient element extraction, and discloses a step-by-step extraction method of organic selenium in natural selenium-rich agricultural products, which comprises the following steps: cleaning, drying and crushing the natural selenium-rich agricultural products into fine powder; then sequentially using an aqueous solution containing a buffer agent, low-concentration ethanol and a high-concentration organic solvent for ultrasonic-assisted extraction to respectively obtain water-soluble, hydrophilic, hydrophobic and fat-soluble organic selenium compounds; and finally, combining the extracting solutions in the steps, and carrying out rotary evaporation concentration and purification treatment to obtain the high-purity organic selenium compound. Through a step-by-step extraction method, different types of organic selenium compounds in natural selenium-rich agricultural products are efficiently extracted by using the aqueous solution, the low-concentration ethanol and the high-concentration organic solvent respectively under low-temperature and mild conditions, so that high purity and biological activity are kept, meanwhile, the process flow is simplified, and the production cost is reduced. The energy consumption and the use of organic solvents are reduced, the environmental pollution is reduced, and the method is suitable for large-scale industrial production.

A hollow fiber flow field separation system used in the method comprises a hollow fiber flow field separation channel, the hollow fiber flow field separation channel is divided into an inner layer and an outer layer and is provided with a three-way port, the outer layer is a silicon dioxide tube, and the inner layer is a silicon dioxide tube; the inner layer is a hollow fiber membrane made of a polyether sulfone material; the plunger pump is communicated with the hollow fiber flow field separation channel so as to pump the flow carrying liquid to flow in the hollow fiber flow field separation channel; the metering valve is communicated with the hollow fiber flow field separation channel so as to control the flow velocity ratio of the inlet and the outlet of the hollow fiber membrane in the focusing process; the valve is communicated with the hollow fiber flow field separation channel, and the switching of the sampling process, the focusing process and the elution process of the carrier liquid in the hollow fiber flow field separation channel is sequentially controlled by changing the flow direction of the channel. The method has the advantages of high anti-interference capability, high purification speed, high separation accuracy, simplicity in operation and the like, and is expected to be used for separating and quantifying polystyrene nanoparticles in complex matrix samples such as environment or biological tissues.

The present disclosure provides a process for concentrating proteins including an ultrafiltering, a diafiltering, and a second ultrafiltering sequence, at elevated temperatures, such as above about 30° C. The disclosure also includes a process for preparing highly concentrated antibody compositions, and highly concentrated antibody products.

The invention discloses a hydrophilic polyethersulfone ultrafiltration membrane based on metalloporphyrin coordination modification as well as a preparation method and application of the hydrophilic polyethersulfone ultrafiltration membrane. According to the ultrafiltration membrane, a membrane casting solution is prepared by blending a polyether sulfone base material, an organic solvent, a pore-foaming agent and tetra (4-aminophenyl) porphyrin, and the membrane casting solution is cured and formed in a coagulating bath containing ferric ions through a phase inversion process. The preparation method is characterized in that porphyrin compounds and iron ions are subjected to an in-situ coordination reaction in the phase inversion process to form a stable metalloporphyrin complex network structure, and the prepared ultrafiltration membrane has the following advantages that the hydrophilicity is increased, and the pure water flux is increased; the protein rejection rate is not less than 95%; the antibacterial property and the anti-pollution property are excellent. The process is simple and controllable, and the obtained membrane material has important application value in the field of biological medicine separation.

The invention discloses a method for extracting a target product from a milk raw material, and relates to the technical field of food processing. According to the method, before strong anion exchange chromatography is carried out, a synergistic pretreatment step of ultrafiltration and conductivity adjustment is introduced, so that acceleration, synergism, quality improvement and cost reduction of the chromatography process are realized, and the technical bottlenecks of low speed, easiness in pollution, instability and the like of the traditional ion exchange chromatography during treatment of milk raw materials are overcome; and a solution is provided for high-efficiency, high-purity and large-scale production of the beta-lactoglobulin and the alpha-lactalbumin. According to the method, strong anion exchange chromatography and weak anion exchange chromatography can be combined, so that the extraction purity of beta-lactoglobulin and alpha-lactalbumin can be further improved; in addition, the method can synchronously realize high-efficiency extraction of various target substances such as casein micelles, lactose and milk mineral salts, so that the additional value and resource utilization efficiency of milk source byproducts are greatly improved.

The invention discloses equipment and a method for preparing an electronic-grade salicylic acid solution. The equipment comprises an acidification tank, an alkali tank, a micron filter, an anion filter, a cation adsorption column and a nano filter. The acidification tank is used for loading a salicylic acid solution and an acidic substance, and the alkali tank is used for loading an eluent. The method comprises the following steps: firstly, removing large impurities from a salicylic acid solution and acidic substances through a micron filter, then conveying the salicylic acid solution and acidic substances to an anion filter, adsorbing salicylic acid through anion adsorption resin to obtain phenol, removing the phenol, then introducing an eluent, washing off the salicylic acid solution, conveying the salicylic acid solution to a cation adsorption column to remove metal ions, and finally conveying the salicylic acid solution and the acidic substances to a nano filter to obtain the purified salicylic acid. And reducing the granularity of the salicylic acid solution to obtain the electronic-grade salicylic acid solution. The electronic-grade salicylic acid solution has the advantage of strong selective complexing ability to metals, and has a good wet etching effect in the integrated circuit manufacturing process.