87results about "Electrodialysis" patented technology

This invention discloses a method and system for selective separation of monovalent and divalent ions in an alginate fiber coagulation bath based on electrodialysis, belonging to the field of fiber production and membrane separation technology. The method and system integrate a selective electrodialysis device into a traditional coagulation bath circulation system. Utilizing an ion exchange membrane with monovalent and divalent cation selectivity, sodium ions accumulated in the coagulation bath are selectively migrated and removed under the action of an electric field, while divalent metal ions are efficiently retained, thereby maintaining a stable molar ratio of divalent ions to sodium ions in the coagulation bath within the required process range. Compared to traditional methods, this invention eliminates the need for large-scale replenishment of divalent metal salts or full replacement solution, significantly reducing production costs and resource waste. It achieves online regeneration and continuous circulation of the coagulation bath, significantly improving production stability, fiber quality, and resource utilization efficiency, and is suitable for the green and efficient production of various alginate fibers.

The present invention relates to a process for separating lithium ions and sodium ions from a sulfate-containing solution, and to an apparatus for carrying out the process.

An electrodialysis device according to one embodiment of the present disclosure includes an ion exchange membrane configured to exchange ions and gaskets provided to be in contact with the ion exchange membrane and configured to seal the ion exchange membrane, in which the gaskets include a first gasket positioned at one side of the ion exchange membrane and a second gasket positioned at the other side of the ion exchange membrane, in which the first gasket includes a first main gasket, and first auxiliary gaskets configured to surround the first main gasket and in which a thermal expansion rate of the first main gasket is lower than a thermal expansion rate of the first auxiliary gasket.

A method for recycling catalytic metals comprising: collecting a plurality of spent catalytic metals, wherein the spent catalytic metals contain cathodes of NMC111, NMC622, NMC811, NCA, LCoO2, LiNi0.5Mn1.5O4, LiMnO4, LiNiO2, LiMn2O4, and / or LiMnO2 compositions; subjecting the plurality of spent catalytic metals to a green mixture, wherein the green mixture includes dihydrogen phosphite and water, phosphoric acid and water, sulfuric acid and water, hydrogen chloride and water, or nitric acid and water, at temperatures of between 80 and 120° C. to form a metal leachate solution; and recovering lithium (Li) from the metal leachate solution.

This invention discloses a method for preparing high-purity hydroiodic acid based on an electrodialysis system, belonging to the fields of chemical engineering and new energy technology. The method includes: introducing a first iodide solution into the material chamber of a three-compartment bipolar membrane electrodialysis system; after acid-base preparation, a second iodide solution is obtained; the obtained second iodide solution is then introduced into the desalination and concentration chambers of a two-compartment homogeneous membrane electrodialysis system for electrodialysis concentration, yielding a third and fourth iodide solution; the products from each stage can be reused or sold after processing. This invention avoids the generation of the byproduct iodate, directly generating a high-purity, high-concentration hydroiodic acid solution, eliminating cumbersome and expensive purification steps, and completely achieving product separation. The process is simple, safe, and environmentally friendly. The acid produced by the three-compartment bipolar membrane electrodialysis system becomes a qualified hydroiodic acid product after passing through an MVR evaporation system, and the produced alkali, as a byproduct, can be sold or utilized, turning waste into treasure.

The instant invention relates to compositions comprising a protein, e.g., an antibody, or antigen-binding portion thereof, e.g., an anti-IL-1R1 antibody or antigen binding portion thereof, and methods, e.g., cell culture and protein purification methods, for producing such compositions.

This invention provides a covalent organic framework hybrid matrix membrane, its in-situ growth method, and its application in ion separation. The method includes: dissolving cellulose derivatives, aldehyde monomers of covalent organic frameworks, and amine monomers of covalent organic frameworks in an organic solvent to obtain a first solution, a second solution, and a third solution; mixing acetic acid solution with the first, second, and third solutions to obtain a homogeneous casting solution; and drop-coating the homogeneous casting solution for in-situ growth. This invention constructs a CD@COF hybrid matrix membrane based on a cellulose derivative matrix and a low-loading covalent organic framework filler using an in-situ growth method. The prepared hybrid matrix membrane exhibits good interfacial compatibility between the matrix and the filler. The above-mentioned hybrid matrix membrane preparation process is simple, possesses good mechanical strength and high scalability, and demonstrates high ion flux and excellent ion selectivity for separating monovalent and divalent ions. It has broad application prospects in wastewater resource treatment, lithium extraction from salt lakes, and energy storage.

The application discloses a PSPEEK / COF composite membrane for reverse electrodialysis technology and a preparation method thereof, and belongs to the technical field of renewable energy extraction. First, sulfonated polyether ether ketone material is synthesized by using ether ether ketone and concentrated sulfuric acid, then a porous sulfonated polyether ether ketone casting solution is prepared by adding a solvent and polyethylene glycol 400, then a COF membrane is formed above the PSPEEK casting solution by using an interfacial polymerization method, finally, the PSPEEK / COF composite membrane is obtained by removing the solvent and polyethylene glycol 400. The COF membrane with inherent pore transmission channels is prepared first, and the COF membrane is used for selectively conducting cations. The mechanical stability of the COF membrane is improved by combining the COF membrane with the PSPEEK substrate. The prepared membrane has high salt difference power generation performance and long service life.

An anion exchange membrane and a method for producing the same are disclosed. The anion exchange membrane comprises a porous polymer support; and an electrolyte containing an anion exchange polymer; wherein the electrolyte is located on the surface and in part within the pores of the porous polymer support; and the anion exchange polymer is also a crosslinking product of a composition containing a crosslinkable monomer represented by the following chemical formula 1 and an ionic monomer represented by the following chemical formula 2: JPEG2026516927000016.jpg56170 In chemical formulas 1 and 2, A, R1, R2, R3, R4, X - , Y - p, q, and r are as disclosed in the specification, respectively.

This invention discloses a self-microporous polymer, a self-microporous ion exchange membrane, its preparation method, and its applications, belonging to the field of polymer materials technology. The polymer uses 1,3,5-tris(4-aminophenyl)benzene (TAPB), o-toluidine (DMBP), and dimethylformaldehyde as monomers. Utilizing the rigid, distorted, and non-densely stacked molecular structures of TAPB and DMBP, a polymer material with an inherent sub-nanometer microporous structure and its corresponding homogeneous ion exchange membrane are prepared. The formed self-microporous structure constructs continuous ion transport channels within the membrane, where the sub-nanometer-scale micropores impart a significant size sieving effect, thereby achieving selective separation of monovalent / polyvalent anions. Furthermore, by quaternizing the membrane material, fixed positively charged groups are introduced onto the polymer backbone. These positively charged groups generate significant electrostatic repulsion, enabling selective separation of monovalent / polyvalent cations, particularly suitable for the efficient separation of lithium and magnesium ions.

The present application belongs to the technical field of lithium ion battery recycling, and particularly relates to a method for preparing lithium dihydrogen phosphate from recycled batteries, comprising the following steps: (1) obtaining a lithium-containing solution by acid leaching and purifying waste battery powder; (2) performing an electrodialysis double decomposition reaction on the lithium-containing solution and a sodium dihydrogen phosphate solution to obtain a lithium dihydrogen phosphate solution and a sodium-containing solution. The electrodialysis double decomposition reaction converts the traditional liquid-phase double decomposition reaction into a controllable ion membrane exchange reaction under the driving of an electric field, realizes efficient and clean separation of the target product and impurity ions, avoids the introduction of new impurities, realizes the separation of Li + and SO4 2‑ , and obtains a sodium sulfate by-product, thereby improving the economic efficiency of the process.

Provided is a bipolar electrodialysis apparatus for producing lithium hydroxide, including, in sequence, an anode, a first bipolar membrane, an anion-selective ion exchange membrane, a cation-selective ion exchange membrane, a second bipolar membrane, and a cathode, the apparatus comprising: an acidic solution compartment which is formed between the first bipolar membrane and the anion-selective ion exchange membrane and in which an acidic solution is generated; a basic solution compartment which is formed between the second bipolar membrane and the cation-selective ion exchange membrane and in which a basic solution is generated; and a salt solution compartment which is formed between the anion-selective ion exchange membrane and the cation-selective ion exchange membrane, wherein a lithium salt aqueous solution is introduced into the salt solution compartment, water is introduced into each of the acidic solution compartment and the basic solution compartment, an electrode solution is introduced between the anode and the first bipolar membrane and between the cathode and the second bipolar membrane, and the electrode solution includes a redox compound.

The present invention provides an apparatus and a method for evaluating the performance of an ion exchange membrane in an electrodialysis process, the method comprising the steps of: supplying deionized water corresponding to a basic input flow rate to an acid chamber and a base chamber; measuring the concentration of a solution in each chamber according to the basic input flow rate; estimating a characteristic value of an ion exchange membrane on the basis of the measured concentration of the solution; determining an input flow rate of the deionized water corresponding to a target concentration of the solution by using the estimated characteristic value; supplying the deionized water to each chamber at the determined input flow rate for a predetermined operation time; and evaluating the performance of the ion exchange membrane on the basis of a performance index determined after the predetermined operation time has elapsed.

The present invention relates to a bipolar electrodialysis apparatus for producing lithium hydroxide and sulfuric acid from a lithium sulfate solution. A bipolar electrodialysis apparatus (100) for producing lithium hydroxide and sulfuric acid from lithium sulfate comprises: a positive electrode (20) and a negative electrode (30) that face each other; a first bipolar film (40), an anion-selective dialysis film (60), a cation-selective dialysis film (70), and a second bipolar film (50) that are disposed between the positive electrode (20) and the negative electrode (30); and a porous first nickel foam (80) disposed on the plane of the positive electrode (20) to be in close contact with each other and a porous second nickel foam (90) disposed on the plane of the negative electrode (30) to be in close contact with each other, wherein the nickel foams (80, 90) have a porosity of 50-90%.

The application discloses a kind of based on modified ion exchange membrane electro dialysis water treatment method, comprising the following steps: S1: surface functionalization modification is carried out to cation exchange membrane and anion exchange membrane to form modified exchange membrane;S2: construction electro dialysis, the modified cation exchange membrane and modified anion exchange membrane obtained in S1 are alternately arranged to form fresh water chamber and concentrated water chamber;S3: to be handled water body is imported into electro dialysis, direct current electric field is applied to the two poles of electro dialysis device;S4: based on the directional screening and migration mechanism of modified ion exchange membrane under the action of electric field, the target ion in the water body to be handled is enriched and separated.The application has the advantages compared with prior art: provide a kind of based on modified ion exchange membrane electro dialysis water treatment method, improve ion separation efficiency, reduce the risk of membrane pollution, it is convenient to operate and use.

The disclosed subject matter relates to system and methods for electrochemical extractions of target ions, such as lithium.

An anion exchange membrane and a method of preparing the same are provided. The anion exchange membrane includes a porous polymer support, and an electrolyte containing an anion exchange polymer, wherein the electrolyte is located at least on a portion of the surface and the inside of pores of the porous support, and the anion exchange polymer may be a crosslinked product of a composition including a crosslinkable monomer represented by Formula 1 and an ionic monomer represented by Formula 2.In Formulas 1 and 2, A, R1, R2, R3, R4, X−, Y−, p, q, and r are as disclosed in the specification.

Provided is a method for producing lithium hydroxide, comprising the steps of: introducing a lithium salt solution into a salt solution compartment, and introducing water into an acidic solution compartment and a basic solution compartment; discharging, from the acidic solution compartment, a sulfuric acid solution including sulfuric acid ions separated from the lithium salt solution by an anion-selective ion exchange membrane and hydrogen ions generated by decomposing water through electrodialysis in a first bipolar membrane; discharging, from the basic solution compartment, a lithium hydroxide solution including lithium ions separated from the lithium salt solution by a cation-selective ion exchange membrane and hydroxide ions generated by decomposing water through electrolysis in a second bipolar membrane; and adding an additive to the lithium hydroxide solution discharged from the basic solution compartment to precipitate impurities and remove same.

The application provides a separation and decolorization method for preparing glyoxylic acid electrolyte by oxalic acid electrolysis through an electrodialysis method, and the method comprises the following steps: freezing treatment is performed on the glyoxylic acid electrolyte, so that oxalic acid is crystallized and separated out, and after solid-liquid separation, pretreated electrolyte is obtained; and the pretreated electrolyte is subjected to electrodialysis treatment, so that residual oxalic acid is removed and decolorization is realized, and high-purity glyoxylic acid product is obtained. The separation and decolorization method solves the problems of over-standard chroma of glyoxylic acid product, incomplete separation of oxalic acid and glyoxylic acid, and unstable product quality in the two-step crystallization process of the existing method for preparing glyoxylic acid by oxalic acid electrolysis.

Systems and methods for a catalyzed asymmetric bipolar membrane are described. The catalyzed asymmetric bipolar membrane can maintain a desired current density over a long period of time at a low operating voltage. The catalyzed asymmetric bipolar membrane can be implemented in an electrodialysis cell for various applications such as carbon capture.

Systems and methods for catalyzed asymmetric bipolar membranes are described. Catalyzed asymmetric bipolar membranes can sustain desired current densities under low operational voltage for prolonged time periods. Catalyzed asymmetric bipolar membranes can be implemented in electrodialysis cells for various applications such as carbon capture.

The present application relates to a kind of glycol regeneration and recovery system based on electrodialysis desalination technology, belong to oil and gas exploitation technical field, applied to offshore oil and gas field and future natural gas hydrate exploitation.Its technical points are: including pretreatment unit, electrodialysis unit, double-effect evaporation unit, auxiliary system, vacuum unit, each part is connected by corresponding pipeline, constitute a kind of based on electrodialysis desalination, double-effect evaporation technology offshore natural gas hydrate exploitation glycol regeneration and recovery system, the present application introduces glycol electrodialysis desalination monovalent salt technology, glycol double-effect evaporation dehydration technology, auxiliary system self-circulation salt balance technology, with the advantages of environmental protection, low energy consumption, small volume, flexible arrangement, low operating cost.

The application provides a high-oxidation-resistance perfluorosulfonic acid composite cation exchange membrane and a preparation method and application thereof, and belongs to the technical field of membrane separation materials.The asymmetric double-layer porous support is immersed, a larger ion flux is obtained in a low-density area, and a larger ion conduction efficiency is obtained in a high-density area, so that the perfluorosulfonic acid composite cation exchange membrane has excellent oxidation resistance and ion flux.The application utilizes a pulse electric field to directionally regulate and control sulfonic acid group distribution, so that the oxidation side of the membrane is a sulfonic acid group low-density exposure area, the non-oxidation side is a sulfonic acid group high-density enrichment area, a protection area is formed, and the oxidation resistance and tolerance of the perfluorosulfonic acid composite cation exchange membrane are improved.The immersion solution used in the application comprises a perfluorosulfonic acid resin solution and modified oxidation-resistant nano fillers, and under the action of an electric field in the immersion, double protection of'sulfonic acid group low-density exposure + filler sacrificial layer' is realized, and the performance of the membrane is more stable in a complex electrochemical environment.

The application discloses an ion-conducting gauze screen, which comprises a screen frame and a water inflow hole, a cavity is arranged in the middle of the screen frame for water and ion exchange membrane to contact, a screen is arranged in the cavity to avoid direct contact of two layers of membranes and ensure smooth water flow, and the screen is composed of ion-conducting screen wires. The ion-conducting screen wires are twisted by fine yarns with good hydrophilicity, or the ion-conducting screen wires are twisted by solid core yarns, and micropores are formed on the solid core yarns. Or the ion-conducting screen wires are connected with chemical functional groups which are beneficial to ion conduction on the surface. The ion-conducting screen wires are used to replace common solid core wires on the screen, so that the effective area of ion migration channels is increased, and the blocking effect of ion electromigration of the solid core screen wires of the traditional membrane screen is reduced.

The application discloses an olefin-based tertiary amine monomer for a crosslinked anion exchange membrane and a preparation method and application thereof. The monomer structure is shown in a general formula: (R a)(R b)N-R c, wherein R a and R b are each independently selected from an alkyl group, an aryl group, a heterocyclic group or an alkenyl group, R c is a group containing at least one alkenyl group, and at least two groups of R a, R b and R c each contain at least one alkenyl group. The preparation method comprises the following steps: halogenating a tertiary alcohol amine to obtain a halogenated tertiary amine, and then reacting the halogenated tertiary amine with a Grignard reagent prepared from a halogenated olefin to obtain the target monomer. The monomer contains multiple alkenyl groups and tertiary amine groups in the molecule, can be used as a precursor with polymerizable and ionizable functions, and is used for preparing an anion exchange membrane with a three-dimensional network crosslinked structure. The raw material is easy to obtain, the synthesis route is simple, the product structure is adjustable, the prepared anion exchange membrane has high ionic conductivity, excellent dimensional stability and alkali resistance, and is suitable for alkaline fuel cells, water electrolysis hydrogen production and other electrochemical devices.

The invention belongs to the technical field of functional polymer membrane materials, and discloses a method for improving the mechanical stability of an anion exchange membrane. According to the method, two-way stretched porous polytetrafluoroethylene is used as a supporting and reinforcing framework, interface compounding of polytetrafluoroethylene fibers and anion exchange resin is improved, and from OH <-> ion conduction, water diffusion and interface failure of a composite membrane, quaternization modification is carried out on perfluorinated sulfonic acid resin, so that the composite membrane is obtained. Performing impregnation regulation on the interface of the expanded polytetrafluoroethylene film; performing impregnation by using solvents with different proportions to regulate the shrinkage stress of the polytetrafluoroethylene microporous film; and adding a surfactant into anion exchange resin to enhance the wettability of the solution. The preparation of the perfluoro-structure composite reinforced membrane is realized, the mechanical stability of the anion exchange membrane for water electrolysis in a high-temperature and alkali application environment is effectively improved, and the service life of the anion exchange membrane in an alkaline electrolytic bath is prolonged.

The present invention provides a method in which, by changing the shape of a spacer used in an electrodialysis device, flow uniformity in a feed solution and a product stream which flow on the spacer is improved, thus increasing the production of the product stream, and minimizing the amount of electrical energy required for electrodialysis.

Provided is a redox-mediated electrodialysis multi-channel membrane module system for wastewater treatment and resource recycling. Provided is a redox-mediated bipolar membrane electrodialysis (RBED) process, which combines a bipolar membrane electrodialysis (BPED) process with a redox flow desalination process, the present invention is driven at a low potential via a redox reaction with a low operating potential instead of the water-splitting reaction used in conventional electrodialysis. Consequently, the system exhibits superior energy efficiency. By utilizing this redox-mediated multi-channel membrane module system, high-efficiency desalination and resource recycling are possible for wastewater generated during secondary battery manufacturing and metal recovery processes. Furthermore, the energy consumed for desalination and resource recycling can be recovered, thereby providing high energy efficiency and cost competitiveness.

This application relates to the field of carbon capture and utilization and saline wastewater recycling and treatment technology, specifically disclosing a carbon capture coupled with electrodialysis system for alkali production and sodium bicarbonate co-production in a coal-fired power plant. The main purpose is to achieve synergistic linkage between carbon capture, by-product salt resource utilization, and high-value product co-production, balancing environmental protection and economic benefits. The main technical solution of this application is as follows: the system includes a carbon capture unit, a bipolar membrane electrodialysis unit, and a carbonization co-production unit; the carbon capture unit is used to capture carbon dioxide from the flue gas of a coal-fired power plant and uses the waste heat of the power plant as a heat source for the carbon dioxide desorption process; the bipolar membrane electrodialysis unit is driven by green electricity and is used to electrolyze industrial sodium sulfate solution to generate sodium hydroxide solution and sulfuric acid solution; the carbonization co-production unit is connected to the carbon capture unit and the bipolar membrane electrodialysis unit, and is used to perform a directional carbonization reaction between the carbon dioxide and the sodium hydroxide solution to produce sodium bicarbonate.

The application relates to the technical field of wastewater treatment, in particular to a metal-modified ion exchange membrane and a preparation method and application thereof. The metal-modified ion exchange membrane comprises the following steps: taking an anion exchange membrane as a base film, modifying the surface of the base film after impurity removal through pretreatment by using an amino silane coupling agent to obtain an amino silane coupling agent modified base film, and co-loading Zr 4+ , Al 3+ , Nd 3+ on the amine group active sites of the amino silane coupling agent modified base film through coordination bonds, and then forming a ZrO(OH)2, AlO(OH), Nd(OH)3 composite adsorption layer on the surface of the base film through hydroxylation to obtain the metal-modified ion exchange membrane. The ion exchange membrane is modified through the steps of "pretreatment-coupling agent modification-multimetal co-loading-hydroxylation", the bridging effect of the coupling agent is used to strengthen the binding stability of the metal components and the film base material, the multimetal synergistic effect is used to endow the film with efficient and stable fluorine adsorption performance, and the synergistic defluorination of electromigration and chemical adsorption is realized.