152results about "Anion exchangers" patented technology

The present invention relates to the field of cationic polymers, and in particular, to highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers and preparation methods and applications. The preparation method for the highly alkali-stable poly(arylene alkylene piperidinium) cationic polymers includes the following steps: performing catalytic polycondensation on 1-R6-piperidine-3-carboxaldehyde or a salt or hydrate thereof and an aromatic compound to obtain a polymer having a piperidine moiety; and then further subjecting the polymer to a quaternization reaction to obtain the poly(arylene alkylene piperidinium) cationic polymer. The anion exchange membranes prepared from the piperidinium-based cationic polymers have ultra-high alkaline stability and excellent mechanical properties and ionic conductivities, and can be applied to the fields of electrochemical energy conversion such as fuel cells, hydrogen production by water electrolysis, electrochemical reduction of carbon dioxide, flow batteries, and fields of separation such as electrodialysis and water treatment.

This invention provides an ion exchange apparatus that can achieve excellent utilization efficiency of ion exchange resins in the purification of organic compound salt solutions using ion exchange resins. [Solution] An ion exchange apparatus for purifying an organic compound salt solution, comprising a plurality of ion exchange resin layers arranged along the flow direction of the organic compound salt solution, wherein each of the plurality of ion exchange resin layers is formed of either a cation exchange resin or an anion exchange resin, the plurality of ion exchange resin layers are separated from each other by spaces not filled with ion exchange resin, 1 to 11 such spaces are provided, and the total height of the ion exchange resin layers / the flow channel area of ​​the ion exchange resin layers is 0.2 to 2.5 cm². -1 A device that is.

Methods, systems and devices for removing iodide from an aqueous solution including submerging an iodophilic electrode in an aqueous solution containing iodide, applying a current to the electrode, and electrochemically oxidizing the iodide to iodine within the electrode. The electrode may include an iodophilic material and an electrically conductive material. It may also include a binder. The iodophilic material may be a starch, chitosan, carboxycellulose, cationic polymer, or an anion exchange membrane material, for example. After oxidizing the iodide to iodine within the electrode, the electrode may be submerged in a second solution and a current may be applied to reduce the iodine and release it from the electrode in the form of iodide into the second solution.

An azulene-based branched poly aryl-piperidine anion exchange membrane and a preparation method thereof are provided. The exchange membrane includes an azulene-based branched poly aryl-piperidine polymer with a following structure:The preparation method includes: preparing an azulene-based branched poly aryl-piperidine precursor; preparing a cationic azulene-based branched poly aryl-piperidine; preparing the azulene-based branched poly aryl-piperidine anion exchange membrane.

The invention relates to an anion exchange membrane containing a composite film of an ionomer and zirconium oxide particles of formula ZrO2, the ionomer being a block polymer of formula (AB)nA, the symbol A representing a polyvinylaromatic block bearing quaternary amine groups, the symbol B representing a hydrogenated block of a poly(1,3-diene) or a copolymer comprising monomer units of a 1,3-diene and a vinylaromatic monomer, n being an integer equal to or greater than 1, the zirconium oxide particle content of the composite film being greater than 40% by mass of the composite film mass, the zirconium oxide particles having a median volume size, D50, greater than 100 nm and less than 1 µm. The membrane exhibits good plasticity.

The present application relates to membrane electrodes, in particular electrolytic cell devices, including novel materials and membrane electrode design and fabrication methods.

Methods, systems and devices for removing iodide from an aqueous solution including submerging an iodophilic electrode in an aqueous solution containing iodide, applying a current to the electrode, and electrochemically oxidizing the iodide to iodine within the electrode. The electrode may include an iodophilic material and an electrically conductive material. It may also include a binder. The iodophilic material may be a starch, chitosan, carboxycellulose, cationic polymer, or an anion exchange membrane material, for example. After oxidizing the iodide to iodine within the electrode, the electrode may be submerged in a second solution and a current may be applied to reduce the iodine and release it from the electrode in the form of iodide into the second solution.

Provided are a composition for forming an anion exchange polymer, the composition including a first monomer represented by Formula A and a crosslinking agent represented by Formula B, an anion exchange membrane including a crosslinked product thereof, and a method of producing an anion exchange membrane. Detailed descriptions of Formulae A and B are provided in the present specification.

To provide a monovalent selective cation exchange membrane, a monovalent selective cation exchange membrane support, a method for producing a monovalent selective cation exchange membrane, a water treatment system using an ion exchange membrane, and a method of facilitating water treatment using an electrochemical separation device.SOLUTION: A monovalent selective ion exchange membrane includes a polymeric microporous substrate, a cross-linked ion-transferring polymeric layer on a surface of the substrate, and a charged functionalizing layer covalently bound to the ion-transferring layer. A method of producing a monovalent selective cation exchange membrane includes: chemically adsorbing a styrene intermediate layer to the cross-linked ion-transferring polymeric layer on a surface of the polymeric microporous substrate; chlorosulfonating the styrene intermediate layer to attach a chlorosulfonyl group layer; aminating the sulfonyl group layer to attach an amine group layer; and functionalizing the amine group layer with a charged compound layer to produce the cation exchange membrane.SELECTED DRAWING: Figure 2

The present invention aims to provide a polymer having excellent alkali resistance and anion conductivity, a method of producing the polymer, an electrolyte material containing the polymer, and an anion exchange membrane containing the polymer. The present invention relates to a phosphazene bond-containing polymer containing a phosphorus atom constituting a phosphazene bond, the phosphorus atom including a phosphorus atom to which a nitrogen-containing group is bonded, and a nitrogen atom constituting the phosphazene bond, the nitrogen atom including a nitrogen atom to which a hydrocarbon group is bonded.

The purpose of the present invention is to provide a production method for producing an ion-conducting membrane with reduced impurities in a short time. A further purpose is to provide a more compact ion-conducting membrane production device which can reduce the amount of treatment solution used. In order to achieve this purpose, this production method has the following configuration. This method, for producing an ion-conducting membrane that contains a polymer having an ionic group, involves multiple liquid treatment steps in which a precursor membrane is brought into contact with an acid treatment solution or an alkali treatment solution, said precursor membrane containing a polymer in a state in which the aforementioned ionic group forms a salt with an impurity ion, wherein the liquid treatment time in the second and subsequent liquid treatment steps of the multiple liquid treatment steps is shorter than the liquid treatment time in the initial liquid treatment step.

This invention provides a method for preparing a green photopolymerizable anion exchange membrane. The method first dissolves a brominated microporous polymer PIM-Br and a photoinitiator in chloromethylstyrene (VBC) to obtain a yellowish-brown solution. The solution is then cast onto a glass plate and photocured under a nitrogen atmosphere using ultraviolet light. After curing, the membrane is directly immersed in a bis-tertiary amine reagent. The green photopolymerizable anion exchange membrane is obtained through nucleophilic substitution reactions between the bromomethyl group in PIM-Br and the chloromethyl group in VBC and the bis-tertiary amine group. Compared with other methods, the anion exchange membrane preparation method provided by this invention utilizes a free radical polymerization reaction initiated by ultraviolet light irradiation, which has advantages such as short curing time, fast polymerization speed, and no reaction temperature limitation. Furthermore, the use of organic solvents is completely avoided during the preparation process. The prepared anion exchange membrane exhibits excellent electrodialysis desalination performance, resulting in significant economic and environmental benefits.

A low cost, sandwich-structured thin film composite (TFC) anion exchange membrane for redox flow batteries, fuel cells, electrolysis, and other electrochemical reaction applications is described. The sandwich-structured TFC anion exchange membrane comprises a microporous substrate membrane, a first hydrophilic ionomeric polymer coating layer on the surface of the microporous substrate layer, a cross-linked protonated polyamine anion exchange polymer coating layer on top of the first hydrophilic ionomeric polymer coating layer, and a second hydrophilic ionomeric polymer protective layer on top of the cross-linked protonated polyamine anion exchange polymer coating layer. Methods of making the TFC anion exchange membrane comprises a microporous substrate membrane and redox flow battery system incorporating the TFC anion exchange membrane comprises a microporous substrate membrane are also described.

The present disclosure relates to an electroadhesive device, a method for manufacturing the same, and an electrostatic clutch comprising the same, and more specifically, to an electroadhesive device capable of being applied to various fields, such as an electrostatic clutch, by freely controlling electrostatic attraction even at low operating voltages through the application of a polyanionic ionomer and a polycationic ionomer in a heterojunction structure, a method for manufacturing the same, and an electrostatic clutch comprising the same.

Provided are a method for producing an anion exchange resin which is capable of producing an electrolyte membrane with excellent mechanical property (strength).A monomer for forming a hydrophobic group is reacted with a monomer for forming a hydrophilic group in the presence of bis(1,5-cyclooctadiene)nickel(0) as a catalyst, 2,2′-bipyridine as a co-ligand, a bromide or an iodide as a co-catalyst, and a reducing agent to produce an anion exchange resin where the hydrophobic group is connected to the hydrophilic group via direct bond, in which a mole number of bis(1,5-cyclooctadiene)nickel(0) is 0.3 to 1.8 times a total mole number of the monomer for forming a hydrophobic group and the monomer for forming a hydrophilic group.

Methods, systems, and devices for PFAS destruction including providing water containing PFAS to a reactor vessel, irradiating the water with UV light under conditions to destroy at least a portion of the PFAS, passing the treated water through a selective membrane to form permeate and membrane reject comprising PFAS, providing the membrane reject back to the reactor vessel, providing additional water containing PFAS to the reactor vessel within the reactor vessel or before being provided to the reactor vessel, and irradiating the membrane reject and the additional water containing PFAS within the reactor vessel with UV light. The steps may be repeated a plurality of times such that PFAS that is not destroyed is recycled through the reactor vessel. Sensitizers may be added and may also be recycled in the membrane reject with the PFAS.

The invention relates to the technical field of anion exchange membranes, in particular to a preparation method of an alkaline anion exchange membrane containing double functional groups for synergistically improving swelling resistance, which comprises the following steps: dissolving 5g of chloromethylated polyethersulfone in 100mL of N, N-dimethylformamide, adding 1.8 mmol of triethylamine and 1.8 mmol of benzimidazole, refluxing for 8 hours at 70 DEG C under the nitrogen protection condition, filtering, washing, and drying to obtain the alkaline anion exchange membrane containing double functional groups for synergistically improving swelling resistance. Stirring is performed once every 2 hours during the period; and cooling the reaction liquid to room temperature, pouring the reaction liquid into 50mL of ethanol for precipitation, filtering, washing with ethanol for 4 times, 20mL each time, and then carrying out vacuum drying at 60 DEG C for 6 hours to obtain the quaternary ammonium salt-benzimidazole modified polyethersulfone polymer. Quaternary ammonium salt serves as a core ion conduction site, and efficient transmission of OH <-> is guaranteed; benzimidazole can form multiple hydrogen bonds with quaternary ammonium salt and a membrane matrix to effectively restrain molecular chain movement of the membrane body and inhibit swelling of the membrane in an aqueous solution or a high-humidity environment, and meanwhile, benzimidazole can be used as an OH-relay station to promote rapid migration of ions in the membrane.

The invention relates to the technical field of polymer synthesis, in particular to polyarylether containing pyridine groups and thioether groups as well as a preparation method and application of the polyarylether. A pyridine-containing bisphenol monomer, a 4, 4 '-dihydroxy diphenyl sulfide monomer and a dihalo monomer X-Ar-X are used as raw materials, alkali, alkali metal or salt of alkaline earth metal is used as a catalyst, and solution polycondensation is carried out in an aprotic polar solvent to prepare the pyridine-containing dihydroxy diphenyl sulfide. The diphenyl sulfide structure in the molecular chain of the obtained polymer endows the molecular chain with flexibility, the regularity of the molecular chain can be improved, crystallization is more facilitated to obtain a partially crystallized polymer, the limitation of pyridyl-containing agglomerated arylether on application is overcome, swelling of water or a solvent and the like on a membrane can be effectively inhibited, and the polymer has good application prospects. Particularly, the adverse effect of poor membrane stability caused by high swelling of the membrane due to water when the membrane serves as an ion exchange membrane to be applied to a flow battery is avoided. And the polyarylether containing the pyridine group and the thioether group can provide potential thioether crosslinking points with accurate and controllable quantity, so that the swelling resistance and the chemical stability of the membrane material are improved.

Methods, systems and devices for PFAS destruction including removing nitrate from water containing PFAS, combining the water with a sensitizer and a sufficient quantity of base to create a treatment solution having a pH of about 10 or more, and irradiating the treatment solution with UV light in a photoreactor to destroy a portion of the PFAS. The nitrate may be removed electrolytically such as by electrolytically reducing nitrate to nitrogen gas and / or ammonia. The nitrate may be removed by filtration through a selective membrane, such as by reverse osmosis, forward osmosis, nanofiltration, and / or ultrafiltration. The system may include electrolytic cell system including a first cell with a cathode contacting the water containing PFAS in the first cell, a second cell including an anode in an electrolytic solution, a power source, and a salt brine and / or membrane separating the first and second cells.

Provided are a composition for forming an anion exchange polymer, the composition including a first monomer represented by Formula A and a crosslinking agent represented by Formula B, an anion exchange membrane including a crosslinked product thereof, and a method of producing an anion exchange membrane.Detailed descriptions of Formulae A and B are provided in the present specification.

A safety element (100) includes a housing (10), and a filler material (18) comprising a superadsorber (20) and / or an ion exchange resin (30) disposed in a first segment (12) of the housing (10) and configured to remove acidic or non-acidic water, the filler material (18) having a volume depending on an interaction with water when exposed to water or not exposed to water.

The embodiment of the invention provides ion exchange resin for condensate polishing and a preparation method and system, and relates to the technical field of water treatment. The ion exchange resin comprises strongly acidic cation exchange resin and / or strongly basic anion exchange resin, the particle size of the strongly acidic cation exchange resin and / or strongly basic anion exchange resin is 500-700 [mu] m, and the particle size uniformity coefficient is lower than 1.1. The embodiment of the invention can increase the reaction specific surface area and reduce the fluid resistance.

The present invention relates to a polyphenyl ionomer (PPI) suitable for preparing a membrane for use in fuel cell or electrolytic cell applications operating under alkaline conditions. The invention also relates to a method for preparing such polyphenyl ionomers and to a method for preparing membranes thereof.

Methods, systems, and apparatus for disrupting PFAS comprising oxidatively pre-treating an aqueous foam fractionation solution comprising PFAS to form a pre-treated solution, and disrupting PFAS by mixing the aqueous foam fractionation solution with a persulfate and an acid or base to raise or lower pH and oxidize the aqueous foam fractionation solution, and then UV photolysis of the pre-treated solution. For example, UV light of 222 nm, 254 nm and / or 185 nm is directed onto the pretreated aqueous foam fractionation solution. Oxidizing the foam fraction may include placing the aqueous foam fractionation solution at elevated temperature and pressure for a time sufficient for thermal oxidation or ozonation of the aqueous foam fractionation solution.

This invention discloses a method for separating fluorosilicic acid and hydrofluoric acid using an anion exchange membrane, comprising the following steps: adding a flocculant to a fluorosilicic acid-hydrofluoric acid mixture, aging it, then adding a desulfurizing agent to carry out a desulfurization reaction to obtain a mixed solution, adding the mixed solution to the feed side of an anion exchange membrane for membrane separation, and obtaining a hydrofluoric acid solution with a mass concentration of 2-30% on the clear water side after separation. This invention uses a flocculant to rapidly settle solids such as sodium fluorosilicate and potassium fluorosilicate in the fluorosilicic acid-hydrofluoric acid mixture, uses a desulfurizing agent to remove sulfuric acid, and then uses an anion exchange membrane to effectively separate fluorosilicic acid and hydrofluoric acid in the fluorosilicic acid-hydrofluoric acid mixed solution. The hydrofluoric acid separated by membrane separation has high purity and high output value, increases the utilization rate of by-product hydrofluoric acid, and reduces costs.

This invention provides a macrocyclic crosslinked anion exchange membrane constructed using host-guest recognition, its preparation method, and its application. First, a large-volume rigid crosslinking agent, CDIC, is synthesized by using a saturated aqueous solution method to include nonpolar molecules via the host-guest molecular recognition of β-cyclodextrin. Second, a membrane-forming material is prepared by first chloromethylating the polymer and then functionalizing it. Finally, CDIC is introduced into the membrane-forming material to promote the formation of microphase separation structures within the membrane, resulting in a macrocyclic crosslinked anion exchange membrane. The anion exchange membrane synthesized by this invention can be applied in the field of electrodialysis water treatment. The preparation process is simple, the raw materials are inexpensive and readily available, and the resulting anion exchange membrane exhibits suitable water absorption and optimal microphase separation structures at a relatively low charged group density, thereby effectively improving the selectivity and ion transport flux of the anion exchange membrane and providing a new preparation strategy for electrodialysis water treatment devices.

An anion exchange membrane, particularly suitable for use in electrolytic cells and fuel cells, includes a polyolefin support and an active copolymer containing monomeric units derived from an acrylic monomer having a long saturated linear alkyl chain. A saturated linear alkyl chain of a monomer unit derived from an acrylic monomer having a sufficient length of the active copolymer interacts with a similar saturated linear chain exposed on the surface of a polyolefin support, resulting in: adhesion of the active copolymer on the support, thereby allowing an anion exchange membrane having high mechanical properties and durability to be obtained; the positive charge of the active copolymer is isolated within the pores of the polyolefin support, promoting the formation of positively charged ion channels, thereby promoting the migration of hydroxide ions and allowing high performance of electrochemical cells to be achieved. The anion exchange membrane according to the invention can be obtained in an economically advantageous manner by a special process comprising promoting polymerization of a monomer mixture in a reactor, activating the copolymer by piperidine tertiary amine and / or pyrrolidine tertiary amine, promoting formation of quaternary ammonium salts and promoting adhesion of the copolymer to a polyolefin support.

The application discloses a kind of glucosamine hydrochloride crude product purification refining process, comprising the following steps: (1) glucosamine hydrochloride crude product is dissolved in water, then add the composite precipitant consisting of sodium chloride and sodium hydroxide, after standing, solid-liquid separation, collected separated liquid phase.(2) after the liquid phase is concentrated, add sodium percarbonate and mix evenly and stand still.After completion, pass in carbon dioxide to convert sodium hydroxide in concentrated solution into sodium carbonate, then continue to add calcium nitrate under stirring condition to make carbonate ion in system complete precipitation, i.e., the liquid to be extracted is obtained.(3) after the liquid to be extracted is cooled, add ethanol for alcohol precipitation, after completion, carry out solid-liquid separation, and the obtained solid product and separated liquid are collected respectively.The solid product is washed with ethanol and dried, and glucosamine hydrochloride finished product is obtained.The above process not only can improve the purity of glucosamine hydrochloride, but also can improve the yield of glucosamine hydrochloride in alcohol precipitation process, thereby reducing waste.

An ion exchange membrane material is composed of a crosslinked polymer network including a first poly(styrene-b-ethylene-r-butylene-b-styrene) triblock copolymer (SEBS), and second SEBS, and a linker crosslinking the first SEBS and the second SEBS. At least one phenyl group from the first SEBS and the second SEBS is functionalized with an alkyl group, and the carbon at the benzylic position of these alkyl groups is saturated with at least two additional alkyl groups. The linker is a diamine bound to the alkyl functional groups. The ion exchange membrane material is made via a substantially simultaneous quaternization and crosslinking reaction between the diamine linker and SEBS functionalized with alkyl halide groups. Increasing concentration of crosslinker produces membranes with reduced water uptake, leading to an expectation of enhanced stability under hydrated conditions and greater durability. Advantageously, this reduction in water uptake came with little change to ion exchange capacity.