316results about "Cation exchangers" patented technology

The present disclosure discloses an integrated rapid treatment system for nuclear medical radioactive wastewater and an application method thereof. This system includes a wastewater collection unit; a pretreatment unit; a deep purification unit; a solid decay unit; a buffer unit; an online monitoring unit; and a control unit, wherein the online monitoring unit includes a radioactivity level detection module for detecting total α and total β radioactivity concentrations of inlet and outlet water of a medium in each unit, and a real-time monitoring module for treatment process parameters. The present disclosure discloses an integrated rapid treatment system for nuclear medical radioactive wastewater and an application method thereof, which can efficiently and quickly purify multi-nuclide organic low-level wastewater produced by a nuclear medical process, and realize rapid online monitoring and automatic control at the same time.

The invention discloses a monovalent selective cation exchange membrane, a preparation method thereof and an electrodialysis device, and relates to the technical field of ion exchange membranes. The preparation method of the monovalent selective cation exchange membrane comprises the following steps: soaking a cation exchange membrane loaded with a photoinitiator in a co-deposition modification solution containing dopamine, polyethyleneimine and chitosan, carrying out a co-deposition reaction under radiation initiation of ultraviolet light, taking out the cation exchange membrane after the reaction is finished to obtain a co-deposition modified membrane, and then carrying out heat treatment to obtain the monovalent selective cation exchange membrane. The monovalent selective cation exchange membrane is obtained. The ultraviolet light initiator and chitosan with certain adhesion are introduced in the co-deposition process, so that the co-deposition speed of dopamine and polyethyleneimine on the surface of the film is promoted, meanwhile, a base film and a co-deposition modified layer can be connected, the stability of the modified film is improved, the pore size screening effect is improved, and the service life of the film is prolonged. And moreover, ion exchange sites of the modified membrane are not occupied, monovalent and multivalent cations are effectively separated, and meanwhile, good ion flux is achieved.

A process and apparatus for lithium ion extraction. The process includes passing a lithium-containing brine through a lithium-adsorbent, then passing a desorption media through the lithium-adsorbent at a temperature above 40℃ to produce a lithium-enriched eluent. The lithium concentration of the eluent is further increased by passing it through a nanofiltration membrane and a reverse osmosis membrane. Preferably, the eluent is passed through these membranes more than once at a temperature above 40℃. The process is energy-efficient, because it is conducted entirely at temperatures above 40℃. Accordingly, there is no need to decrease the temperature of the lithium-enriched eluent before passing it through the nanofiltration membrane and the reverse osmosis membrane. Moreover, there is no need to increase the temperature of the nanofiltration reverse osmosis permeate before passing it through the lithium-adsorbent as a desorption media, nor is there a need to increase the temperature of the enriched lithium stream before lithium precipitation.

The invention relates to methods for synthesizing an engineered adsorbent suitable for the selective extraction of lithium from brine solutions. The invention describes the advantages of introducing mixed metal oxides into the crystal lattice of anatase titania precursor. The invention offers significant advantages, including high adsorption capacity of the ion sieve, enhanced chemical stability of the sorbent, and higher lithium selectivity.

The invention belongs to the field of cation exchange membranes, and discloses a monovalent selective cation exchange membrane with crown ether encapsulated in the membrane and a preparation method of the monovalent selective cation exchange membrane. Firstly, a sulfonated chloromethylated polymer is synthesized, a solvent is evaporated to form a membrane, and a chemical reaction of chloromethyl and amido contained in the membrane endows a growth site of a covalent organic framework. And then constructing a covalent organic framework in a membrane channel by an in-situ growth method, and packaging the crown ether nano material in the membrane. A regular porous channel of the covalent organic framework and a sulfonic acid group in the base membrane have a synergistic effect, so that good ion flux of monovalent ions is ensured. Meanwhile, the crown ether structure has a special recognition complexing effect on alkali metal ions and has different affinity to different metal ions, so that the monovalent cation selective separation is achieved, and the prepared monovalent selective cation exchange membrane is suitable for an electrodialysis process.

Provided herein are ion-selective separation membranes including a polymer matrix and a metal compound dispersed within the polymer matrix. The metal compound includes HaLibXcOa, where a is from 1 to 1.5, b is from 0 to 0.1, c is from 1 to 2, d is from 4 to 4.5, and X includes manganese or titanium.

The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products.

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%.

Apparatuses and methods for extracting desired chemical species including, without limitation, lithium, specific lithium species, and / or other chemical compounds from input flows in a modular unit. The input flows may be raw materials in which lithium metal and / or lithium species are dissolved and / or extracted. The apparatuses and methods may include daisy chain flow through separate tanks, a column array, and / or combinations thereof.

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.

The present invention relates to ion exchange functionalized polymer molecules comprising repeating units having a benzimidazole unit as a backbone, a side chain, or at least a portion of both. The ion exchange functionalized polymer molecule further includes an ion exchange group attached to the repeating unit. The ion exchange group may be a tetravalent boron group or a metal fluoride, and the metal fluoride may be a multivalent metal atom.

The invention relates to the technical field of wastewater treatment, in particular to modified cation exchange resin, a preparation method and application of the modified cation exchange resin in shale gas wastewater treatment. The modified cation exchange resin is characterized in that the modified cation exchange resin is obtained by compounding cation exchange resin and sodium alginate and then grafting N, N-dimethylacrylamide, and the surface of the modified cation exchange resin has an amido group; wherein the cation exchange resin is weakly acidic cation exchange resin taking carboxylic acid groups as exchange groups. The modified cation exchange resin provided by the invention simultaneously contains carboxyl, hydroxyl and amido, can simultaneously adsorb organic pollutants and metal ions through various mechanisms (such as ion exchange, hydrogen-bond interaction, chelation, hydrophobic interaction and the like), and remarkably improves the treatment capacity and efficiency of the resin on complex wastewater. In addition, the dispersibility of the modified resin in water is improved due to the hydrophilicity of the modified resin, so that the modified resin shows higher stability and efficiency in the treatment process.

Systems and methods for generating radionuclides, such as radium-224, are disclosed herein. Systems herein may include a first cartridge having a first opening, a second opening, and a chamber therebetween having a first resin having affinity for thorium-228 and bismuth-212; a second cartridge having a first opening, a second opening, and a chamber therebetween having a second resin having affinity for thorium-228, a third cartridge having a first opening, a second opening, and a chamber therebetween comprising a third resin having affinity for thorium-228 and bismuth-212, and a fourth cartridge having a first opening, a second opening, and a chamber therebetween having a fourth resin having affinity for lead-212; wherein a continuous flow path is formed from a top of the first cartridge though the second cartridge, through the third cartridge, and to a bottom of the fourth cartridge during system use.

The present application relates to a kind of methods for separating actinium from irradiated thorium target, belong to medical radioisotope manufacturing technical field, solve the problem that thorium element and lanthanide element impurity content in final actinium product in prior art is higher.The present application discloses a kind of methods for separating actinium from irradiated thorium target, first, irradiated thorium target is dissolved, then using cation exchange resin column, UTEVA or TK200 resin extraction column, DGA resin extraction column, LN resin extraction column four-stage series separation purification process, obtain final actinium product.Actinium is efficiently and selectively recovered, and the thorium element and lanthanide element impurity content in final actinium product is significantly reduced.

The invention discloses a UiO-66-based monovalent cation selective separation membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: mixing a zirconium n-propoxide solution with n-propyl alcohol, glacial acetic acid and DMF (Dimethyl Formamide) to prepare a zirconium cluster solution; performing oxygen plasma etching and acrylic acid grafting pretreatment on the BPPO base film to obtain a BPPO / CA film; finally, the BPPO / CA membrane, a zirconium cluster solution, terephthalic acid and triethylamine are subjected to an original growth reaction in a two-chamber reaction tank, and the UiO-66-based monovalent cation selective separation membrane is prepared. The preparation method provided by the invention is simple and mild in condition, and the prepared membrane has good cation selectivity and is suitable for the fields of industrial-grade TMAH solution purification and the like.

The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products.

The invention discloses a method for removing harmful substances in fish oil, and belongs to the technical field of fish oil refining processes. The method is used for solving the technical problem that in the prior art, refined fish oil subjected to degumming and deacidification treatment still contains a large amount of harmful substances such as 3-chloropropanol ester and glycidyl ester. A method for removing harmful substances in fish oil comprises the following steps: degumming and deacidifying crude fish oil to obtain primarily refined fish oil; mixing the primarily refined fish oil, polymerized cation exchange resin and solid hexa-aminobenzene ring to obtain a mixed solid liquid; standing and adsorbing the mixed solid and liquid, and then carrying out suction filtration to obtain an organic phase, namely refined fish oil. According to the invention, the adsorption capacity of 3-chloropropanol ester is improved by designing the acidic cation exchange resin with high adsorption content; by designing a polyamino hexa-amino benzene ring, the capability of removing glycidyl ester is improved, and harmful substances in the fish oil can be effectively removed through a related refining process disclosed by the invention.

The invention relates to the field of precious metal recovery, and particularly discloses a method for recovering gold from gold ion electrolysis tail liquid. A method for recycling gold from gold ion electrolysis tail liquid comprises the following specific steps that S1, ion exchange adsorption is conducted, specifically, after a mixed bed is cleaned, ion exchange resin is soaked with a sodium hydroxide solution and then loaded into the mixed bed, and then the gold ion electrolysis tail liquid is added for ion exchange adsorption; the ion exchange resin adsorbing the gold tail liquid is dried and carbonized to obtain a gold-containing compound, the gold-containing compound and aqua regia are mixed and dissolved, hydrochloric acid is used for denitration to obtain gold aqua regia, vacuum filtering and washing are conducted, then anhydrous sodium sulfite is used for reduction to obtain reduced gold powder, and the gold powder is obtained after drying; the ion exchange resin raw materials comprise cation exchange resin and carboxymethyl chitosan; through the synergistic effect of all the processes, the adsorption capacity and the adsorption rate of the ion exchange resin can be enhanced, and the gold recovery effect is improved.

A process for the recovery of carbon dioxide (CO2) from a carbon dioxide-containing gas, in particular air and / or exhaust gas, comprises the steps: a) contacting the carbon dioxide-containing gas with an absorbent in the form of a solution of aqueous alkali metal hydroxide solution, in particular sodium hydroxide solution and / or potassium hydroxide solution, so that carbon dioxide is absorbed from the carbon dioxide-containing gas and alkali metal carbonate, in particular sodium carbonate (Na2CO3) and / or potassium carbonate (K2CO3), is formed in the absorbent; b) carrying out an ion exchange step, wherein the alkali carbonate formed in step a) is subjected in dissolved form to a cation exchange process so that the alkali ions of the alkali carbonate are bound to a cation exchanger; c) eluting the alkali ions bound to the cation exchanger in step b) with a solution containing ammonia and / or at least one amine, whereby alkali metal hydroxide solution is recovered, which is preferably used for the renewed absorption of carbon dioxide in step a)

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.

This invention belongs to the field of wet electronic chemicals technology, specifically relating to a method for preparing electronic-grade hydrogen peroxide. The method includes the following steps: adjusting the concentration of raw hydrogen peroxide, and then filtering it sequentially through a reverse osmosis membrane, a modified cation exchange resin, an anion exchange resin, and a mixed ion exchange resin to obtain electronic-grade hydrogen peroxide. The modified cation exchange resin used is modified based on conventional cation exchange resin through pore expansion and grafting, optimizing the spatial matching of pore structure and functional sites. This achieves passivation of metal ions, enhanced adsorption capacity, and improved oxidation resistance, as well as a deep synergistic effect of these three effects. Ultimately, it achieves the dual goals of efficient purification and stable operation of the resin in the hydrogen peroxide system. The resulting electronic-grade hydrogen peroxide can reduce the content of single impurity metal ions to below 5 ppt, meeting the requirements of SEMI G5 standards, and can be directly applied to high-end manufacturing fields such as semiconductor wafer cleaning.

The application relates to the technical field of hydrogen production by water electrolysis, in particular to a composite anion exchange membrane and a preparation method and application thereof. The preparation method of the composite anion exchange membrane comprises the following steps: mixing a polymer, an organic solvent and an aldehyde compound to form a casting solution; forming the casting solution to prepare an aldehyde compound-combined anion exchange membrane; immersing the aldehyde compound-combined anion exchange membrane into an acid solution containing an amino compound to perform an aldehyde amine condensation reaction, and forming the composite anion exchange membrane; and the polymer and the amino compound contain quaternary ammonium groups. The application can simply and quickly synthesize a large-area composite anion exchange membrane doped with a covalent organic framework, and the composite anion exchange membrane has good structural stability and excellent ion conduction performance, and can meet the application requirements of hydrogen production by water electrolysis.

A method of making a material for capturing carbon dioxide from the earth's atmosphere, comprises producing an acid and a base with an electrochemical acid-base generator; dissolving a mineral in the acid to produce a mineral rich solution, separating silica from the mineral rich solution to form a silica depleted solution; adding a first portion of the base to the silica depleted solution to remove impurities by precipitation, adding a second portion of the base until ferrous hydroxide (Fe(OH)2) precipitates, then pausing base addition and removing the ferrous hydroxide precipitate from the solution. Then adding a third portion of the base to the iron-depleted solution to precipitate magnesium hydroxide (Mg(OH)2) and / or calcium hydroxide (Ca(OH)2). Then recovering a salt solution and directing the recovered salt solution to the electrochemical acid-base generator to produce a new acid and a new base. The magnesium hydroxide and / or calcium hydroxide may be used to capture and sequester carbon dioxide from a CO2-containing gas (e.g., air) by forming a carbonate or from the ocean by forming bicarbonate.

The invention relates to the field of wastewater treatment, in particular to a water quality conditioner added with improved humic acid and a preparation method of the water quality conditioner. The water quality conditioner added with the improved humic acid is obtained by compounding the improved humic acid and interface functionalized hematite nanocrystals; the improved humic acid is methacrylic acid grafted phenol modified humic acid; the interface functionalized hematite nanocrystals are selected from one of caffeic acid interface functionalized hematite nanocrystals and benzimidazole interface functionalized hematite nanocrystals. No toxic reducing agent or precious metal is used; caffeic acid and benzimidazole are degradable or low-toxicity small molecules, and the residual quantity is low; the final product is Cr (III) hydroxide or organic complex, can be further precipitated or recycled, and accords with the concept of green water treatment. All reaction preparation conditions are mild, and equipment requirements are low. The raw materials are wide in source, low in cost and suitable for industrial production.

The invention provides a water washing-ion exchange method combined method for purifying powder cation resin, and belongs to the technical field of purification of powder cation resin for condensate polishing. The method comprises the following steps: washing powder cation exchange resin with water; uniformly mixing the washed powder cation exchange resin with the granular strong-base anion exchange resin, carrying out constant-temperature treatment, separating the powder cation exchange resin from the granular strong-base anion exchange resin, and removing moisture in the separated powder cation exchange resin; and determining the powder cation exchange resin dissolved substance. Most soluble ions in the powder cation resin are rapidly removed through water washing, and then trace ions in the powder cation resin are further removed through an ion exchange method. The method has the advantages of simplicity in operation, low cost, no secondary pollution and the like, and the conductivity of the powder cation resin dissolved substance can be greatly reduced after purification.

The present invention relates to a method for recovering manganese from ternary battery waste liquid. The method comprises the following steps: subjecting the ternary battery waste liquid to column chromatography treatment and collecting the eluate; subjecting the eluate to ion exchange treatment through a cation exchange resin and enriching the manganese ions in the eluate; wherein the chromatographic column filler used in the column chromatography treatment is a cross-linked aminosilane-modified silica microsphere. Through the reverse adsorption and elution effect of the aminosilane-modified silica microsphere, the impurity ions are adsorbed by the silica gel column and the manganese ions enter the eluate, thereby realizing the separation of manganese ions from impurity ions, and in conjunction with the subsequent cation exchange process, the manganese ions are adsorbed by the cation exchange resin to realize the enrichment of manganese ions. In addition, the method has a simple and easy-to-control process, is easy to operate, has low equipment investment, low reagent cost, mild reaction conditions, is green and environmentally friendly, has controllable quality and is easy to industrialize, has good environmental and economic effects, and has broad application prospects.

The present invention relates to new stationary phases carrying boron clusters. Target molecules can interact with this stationary phase depending on the type and substituents of the cluster. The stationary phases are suitable for SPE and chromatographic separations.

Sorbent cartridges having a flow control insert to improve the functional capacity of a sorbent cartridge is provided. Flow control inserts can include a plurality of flow channels filled with sorbent material through which fluid to be regenerated can travel in the sorbent cartridge.