448results about "Anion exchangers" patented technology

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.

The invention relates to the technical field of cationic polymers, in particular to a high-alkali-resistance polyarylene alkylene piperidine cationic polymer as well as a preparation method and application thereof. The preparation method of the high alkali resistance poly (arylene alkylene piperidine) cationic polymer comprises the following steps: carrying out catalytic polycondensation on 1-R6-3-piperidine formaldehyde or salt or hydrate thereof and an aromatic compound to obtain a polymer with a piperidine structure; and further performing ionization reaction to obtain the polyarylene alkylene piperidine cationic polymer. The anion exchange membrane prepared based on the piperidine cationic polymer has ultrahigh alkali resistance and excellent mechanical properties and ionic conductivity, and can be used in the electrochemical energy conversion fields of fuel cells, water electrolysis hydrogen production, carbon dioxide electroreduction, flow batteries and the like, and the separation fields of electrodialysis, water treatment and the like.

The invention discloses a preparation method of an acid-resistant polyquaternary ammonium membrane based on a Porxitch interfacial polymerization reaction. The preparation method comprises the following steps: dissolving an amine monomer in a water-phase solvent to form a water-phase solution; dissolving a bromomethyl monomer in an organic phase solvent to form an organic phase solution; after the base membrane is soaked in the water phase solution for a period of time, the water phase solution is removed, and the water phase solution remaining on the surface of the base membrane is removed; coating the organic phase solution on the surface of a base membrane, and carrying out interfacial polymerization reaction for 1-15 minutes at the high temperature of 50-90 DEG C, so as to prepare a polyquaternary ammonium membrane on the base membrane; and washing the surface of the polyquaternary ammonium membrane with an organic solvent to remove residual reactants, and then carrying out heat treatment in a drying oven to obtain the acid-resistant polyquaternary ammonium membrane.

The invention discloses a method for recovering mixed acid waste liquid containing hydrofluoric acid, which comprises the following steps: reacting raw materials with sodium salt or potassium salt, and filtering to obtain filtrate; the raw material is mixed acid waste liquid containing hydrofluoric acid; feeding the filtrate into a diffusion dialysis device for treatment, wherein the diffusion dialysis device comprises a homogeneous anion exchange membrane; the recovery liquid obtained through treatment of the diffusion dialysis device is fed into a membrane separation device, the membrane material of the membrane separation device is an acid-resistant metal ion removal membrane, and the recovered mixed acid is obtained on the permeation side of the membrane separation device. According to the method, impurities and metal ions in the low-concentration waste acid solution can be effectively removed, the product reaches the electronic-grade recycling standard, the resource recycling rate is increased, the technological process is simple, energy consumption is low, and the method is suitable for industrial application and popularization.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

Methods, systems and devices for PFAS destruction including oxidatively pretreating an aqueous foam fractionate solution including PFAS to form a pretreated solution by mixing the aqueous foam fractionate solution with a persulfate and an acid or a base to increase or decrease the pH and oxidizing the aqueous foam fractionate solution and then subjecting the pretreated solution to UV photolysis, such as by directing UV light onto the pretreated aqueous foam fractionate solution at 222 nm, 254 nm and / or 185 nm. Oxidizing the foam fraction may include subjecting the aqueous foam fractionate solution to an increased temperature and pressure for a period of time sufficient for thermal oxidation or subjecting the aqueous foam fractionate solution to ozone oxidation.

The invention relates to the technical field of cationic polymers, in particular to a high-alkali-resistance polyarylene alkylene piperidine cationic polymer with a branched structure as well as a preparation method and application of the high-alkali-resistance polyarylene alkylene piperidine cationic polymer with the branched structure, and the high-alkali-resistance polyarylene alkylene piperidine cationic polymer comprises one or more of a central unit, a linear unit L1 and a linear unit L2, the central unit comprises one or more of an MA unit, a piperidine cation unit m-DMP and a CA unit, the linear unit L1 comprises the piperidine cation unit m-DMP and a BA unit, and the linear unit L2 comprises a BA unit and a CA unit. By adopting the steps, the interaction force between polymer molecular chains is enhanced and the polymer molecular weight is increased through a branching strategy, so that the water absorption swelling of the prepared anion exchange membrane is inhibited, and the anion exchange membrane shows outstanding conductivity and mechanical properties; meanwhile, piperidine cations are linked to a polymer skeleton with a branched structure through a flexible spacer, so that the prepared anion exchange membrane has outstanding alkali resistance.

Methods, systems and devices for photo-electrolyitic PFAS destruction including a photoreactor vessel configured to receive an aqueous solution including PFAS, a UV light source configured to direct UV light onto the aqueous solution in the photoreactor vessel, a cathode within the photoreactor vessel configured to contact the aqueous solution, an anode in an electrolyte solution, an electrical power supply configured to provide a voltage difference between the anode and cathode, and a membrane or ionic bridge between the anode and cathode. The cathode may be a mesh and may have a high surface area construction with an electrochemically active surface area that is greater than the geometric surface area.

The present invention relates to a product comprising: - water, and - crystallites, at least some, preferably substantially all of said crystallites consisting of lithiated bayerite, the average size of the lithiated bayerite crystallites being greater than or equal to 10 nm and less than or equal to 25 nm, and said product having a cumulative content of aluminium hydroxide and boehmite of less than or equal to 10%, said product comprising at least the elements Li, Cl, Al, O and H, the elements Li, Cl and Al being present in said dry product in the following contents, determined by inductively coupled plasma mass spectrometry, in percentages by weight: - 2% < Li < 5%, - 10% < Cl < 26%, - 15% < Al < 30%.

The invention relates to the technical field of membrane separation, and discloses a double-side-chain anion exchange membrane as well as a preparation method and application thereof. The anion exchange membrane comprises a plurality of polyphenyl ether molecular chains, the polyphenyl ether molecular chain has a structure as shown in a formula I; # imgabs0 # Q1, Q2, Q3 and Q4 are each independently a group represented by formula II, a group represented by formula III, Br or H; at least two of Q1, Q2, Q3 and Q4 are a group as shown in a formula II and a group as shown in a formula III; at least two polyphenyl ether molecular chains of # imgabs 1 # are connected through a structure Ar from a cross-linking agent; according to the double-side-chain anion exchange membrane, two long-chain hydrophobic alkyl side chains are introduced into a polyphenyl ether molecular chain, so that the content of an active ion exchange matrix in the anion exchange membrane is remarkably increased, and the performance of the anion exchange membrane is improved.

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.

According to the high-strength resin and the preparation method thereof, firstly, styrene-divinylbenzene copolymerization reaction or divinylbenzene polymerization reaction which is carried out under common normal pressure is promoted to be carried out under high pressure of 0.3-0.6 MPa, so that the polymerization reaction temperature can be increased; therefore, the reaction activity of polystyrene and styrene free radicals or divinylbenzene free radicals is improved, the average molecular weight of a polystyrene main chain or a polydivinylbenzene main chain in the polymer is further improved, and the molecular weight distribution dispersity is reduced; secondly, a free radical initiator is not added, and the structural defect caused by tiny bubbles generated by decomposition of the initiator is also eliminated; thirdly, nitrogen is charged for deoxidation before polymerization reaction, free radical terminator oxygen is removed, free radical inactivation caused by dissolved oxygen is avoided, and chain growth and termination of a main molecular chain are avoided. The styrene resin beads with high polymerization degree are prepared, and the mechanical strength of the synthesized anion-cation exchange resin and adsorption resin is greatly improved.

The invention discloses a human albumin binding peptide 1E3 and application of the human albumin binding peptide 1E3 in promoting purification of human albumin, and belongs to the technical field of polypeptides. The human albumin binding peptide comprises an amino acid sequence as shown in SEQ ID NO. 1; and / or an amino acid sequence of a fusion protein with the same function, which is obtained by connecting tag protein to the N terminal and / or C terminal of the amino acid sequence as shown in SEQ ID NO.1. The human albumin binding peptide has extremely high affinity with human albumin and can be used for separating and purifying a human albumin solution, and the purity of the purified human albumin far exceeds the pharmacopoeia standard and can reach 99.99% or above. The method is good in safety and stable in process, and has a wide application prospect in the aspect of separation and purification of the human albumin.

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.

The invention relates to a preparation method of an anion exchange membrane for cross-chain transportation. The anion exchange membrane has the advantages of small resistance, high ion transmission rate and good desalting performance. Specifically, a crown ether structure is introduced, so that a direct and efficient ion transmission path is provided; the introduction of crown ether not only improves the chemical stability of the anion exchange membrane, so that the membrane can stably work in a wider chemical environment, but also enhances the ion selectivity; the crown ether structure is chemically modified, so that the properties of an ion channel can be further regulated and optimized, such as changing the size and shape of the channel or the characteristics of a functional group, so as to adapt to specific ion screening requirements. In addition, the anion exchange membrane also achieves a remarkable effect on optimization of transmittance and resistance. Due to the characteristics, the membrane material can show higher efficiency and reliability in various industrial applications.

The invention relates to the technical field of anion exchange membranes, in particular to a dual-ion-channel synergistic enhanced conduction anion exchange membrane for alkaline water electrolysis hydrogen production and a preparation method of the dual-ion-channel synergistic enhanced conduction anion exchange membrane for alkaline water electrolysis hydrogen production, and the dual-ion-channel synergistic enhanced conduction anion exchange membrane for alkaline water electrolysis hydrogen production is prepared by blending and crosslinking quaternized polyether-ether-ketone and carboxylated polyether sulfone, the carboxylated polyethersulfone provides a cation channel to form a double-ion synergistic conduction structure; the preparation process of the anion exchange membrane comprises the steps of quaternized polyether-ether-ketone synthesis, carboxylated polyether sulfone synthesis, membrane casting solution preparation, tape casting drying, crosslinking treatment and alkali liquor ion exchange. By constructing a double-ion channel structure, the synergistic conduction of anions and cations is realized, and the total ion conduction efficiency of the membrane is remarkably improved. The two polymer components form a continuously interlaced channel network, so that the defect that the conduction path of the traditional single ion channel membrane is isolated is avoided.

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.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

The invention discloses anion exchange resin. Raw materials comprise a synthetic monomer, an initiator and a cross-linking agent, wherein the synthetic monomer comprises methacryloyloxyethyl trimethyl ammonium chloride and acrylamide according to the weight ratio of 7: 3; the initiator comprises potassium persulfate and acrylamide in a weight ratio of 1: 20; the cross-linking agent comprises N, N-methylene bisacrylamide and acrylamide according to the weight ratio of 1: 20. Methacryloyloxyethyl trimethyl ammonium chloride is introduced into a polyacrylamide resin polymerization system, so that the water-absorbent resin has a quaternary ammonium salt-N (CH3) < 3 + > functional group, and dichromate ions in an aqueous solution can be removed.

The invention relates to the technical field of anion exchange, in particular to styrene anion resin for hydrometallurgy and a preparation method of the styrene anion resin. The preparation method of the anion resin comprises the following steps: polymerizing divinylbenzene serving as a cross-linking agent with styrene, then carrying out polymerization reaction with a pore-foaming agent, an initiator, a dispersing agent and the like to obtain styrene white balls, carrying out chlorination and amination, and then reacting with isocyanate pyridine for functionalization to obtain the styrene anion resin with functional groups. The adsorption capacity and the thermal stability of the anion resin on heavy metal ions are improved. Compared with the prior art, the anion resin prepared by the invention has strong adsorption capacity on heavy metal ions and good thermal stability.

The invention relates to dechlorination ion exchange resin and a preparation method thereof, and belongs to the technical field of ion exchange resin. The ion exchange resin capable of being used for dechlorination is prepared, the stability of the ion exchange resin in the dechlorination process is maintained through the added modified lignin, and groups with good affinity to chloride ions are introduced through concentrated sulfuric acid and amination treatment; finally, the dechlorination efficiency of the ion exchange resin is further improved through plasma treatment.

The invention discloses a pore filling type anion exchange membrane, a preparation method thereof and a water electrolysis hydrogen production device, and belongs to the technical field of ion exchange membranes. The pore filling type anion exchange membrane is prepared from a pretreated polyethylene porous diaphragm and biphenyl piperidone-styrene as shown in a formula 1 in pores of the polyethylene porous diaphragm through a thermal crosslinking reaction, n is larger than or equal to 1 and smaller than or equal to 1000, and x / (n-x) is larger than or equal to 0.1 and smaller than or equal to 1; the polyethylene porous diaphragm is pretreated by soaking in an alcohol solvent. The pore filling type anion exchange membrane is stable and compact, and has good stability and air tightness, relatively high conductivity and alkali resistance and excellent water electrolysis performance.

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.

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.

To provide layered double hydroxide crystals that realize higher ion exchange capacity than conventional ones.SOLUTION: Layered double hydroxide crystals are provided in which a plurality of plate-like crystals is composed of a structure which is represented by a formula (1) below and in which host and guest layers are alternately stacked. The layered double hydroxide crystals are composed of a plurality of crystal grains having a stacked structure in which the plate-like crystals are stacked. The grain sizes in the width direction of the plurality of crystal grains are all in a range of 0.1 μm to 20.0 μm. [Ni2+1-xCo3+x(OH)2] [(CO32-)X / 2] (1) (where 0.2<x≤0.33).SELECTED DRAWING: Figure 1

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.

To provide an anionic treatment agent that removes the disadvantages of an anionic treatment agent using a layered double hydroxide as a raw material and improves the anion exchange ability, and is suitable for inventory management.SOLUTION: An anionic treatment agent A is a product produced by mixing a layered double hydroxide 1 having anion exchange ability and a feldspar clay 2 that maintains its shape even in water by drying, and subjecting the mixture to the steps of rolling and granulating, drying, and classifying. The layered double hydroxide 1 includes a chlorine type, a carbonate type, or the like depending on the anion species contained in the layer, and when an anionic treatment of an ionic fluorine, nitrogen, or phosphorus compound is intended, it is desirable to use a chlorine type layered double hydroxide having excellent anion exchange selectivity as a raw material. The feldspar clay 2 is obtained by grinding feldspar, which is a type of a tridimensional techtosilicate containing an aluminosilicate such as an alkali metal or an alkaline earth metal as a main component, to form a powder having a size of 5 μm or less.SELECTED DRAWING: Figure 1

Anion exchange polymers having high OH" conductivity, chemical stability, and mechanical stability have been developed for use in AEMs. The anion exchange polymers have stable hydrophobic polymer backbones, stable hydrophilic quaternary ammonium cationic groups, and hydrophilic phenolic hydroxyl groups on the polymer side chains. The polymers have polymer backbones free of ether bonds, hydrophilic polymer side chains, and piperidinium ion-conducting functionality, which enables efficient and stable operation in water or CO2 electrolysis, redox flow battery, and fuel cell applications. The polymer comprises a plurality of repeating units of formula (I) Anion exchange membranes and membrane electrode assemblies incorporating the anion exchange polymers are also described.

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.