181results about "Cation exchangers" patented technology

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 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.

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 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.

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 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.

Systems and methods for generating radionuclides, such as radium-224. 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 and bismuth-212, 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, a fourth cartridge having a first opening, a second opening, and a chamber therebetween having a third 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.

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.

The utility model discloses equipment for preparing hypochlorous acid based on an ion exchange method, which relates to the technical field of hypochlorous acid preparation equipment and comprises a water inlet part, and the liquid inlet end of the water inlet part is connected with an external water supply pipeline; the liquid inlet end of the liquid injection part is connected with the water inlet part; the liquid inlet end of the ion exchange part is connected with the liquid injection part, and the liquid outlet end of the ion exchange part is connected with the hypochlorous acid using terminal through an external liquid conveying pipeline; the pipe diameter of the use terminal is greater than or equal to that of the liquid injection part; the controller is electrically connected with electrical elements in the water inlet part and the liquid injection part; according to the device, high-concentration hypochlorous acid can be prepared, the liquid outlet amount is large, and the weakly acidic cation exchange inner core has a good pH buffering function, so that the potential safety hazard of chlorine overflow does not exist.

The invention relates to a method for preparing a material capable of extracting lithium, comprising the following steps: (a) preparing a geopolymer mixture by mixing (i) an activating solution comprising at least lithium hydroxide and (ii) an aluminosilicate source; (b) curing the geopolymer mixture prepared in step a), thereby obtaining a geopolymer matrix material; and (c) washing the geopolymeric matrix material obtained in step b) so as to remove at least a portion of the lithium cations (Li +) contained in the geopolymeric matrix material and obtain a material capable of extracting lithium The invention also relates to the material thus obtained and to the use thereof.

A proton exchange polymer comprises a polynorbornene copolymer with hydrophobic and hydrophilic blocks that can be phosphonated to produce phosphonic acid functional groups for proton exchange. Also, the polymer may be crosslinked to form quaternary ammonium groups on the side chains. The polynorbornene copolymer may be acid doped to ionically bond phosphonic acids to the quaternary ammonium groups that may for ion pairs for proton exchange. The proton exchange polymer has high temperature stability with the phosphonic acid functional group and can be mechanically durable with cross linking. Proton exchange membranes may utilize the proton exchange membrane in fuel cell and electrolyzer applications.

The utility model provides a device and a system for producing an optical fiber preform based on industrial grade D4. The device for producing the optical fiber preform based on the industrial grade D4 comprises a coarse treatment device, a fine treatment device, a low-boiling-point impurity treatment device and a high-boiling-point treatment device which are communicated in sequence, an anion-cation exchange resin membrane and a molecular sieve are arranged in the fine treatment device to remove metal ions and anion impurities in the D4 liquid, the low-boiling-point impurity treatment device is used for separating low-boiling-point impurities in the D4 liquid, the high-boiling-point treatment device is used for separating high-boiling-point impurities in the D4 liquid, and a gas outlet of the high-boiling-point treatment device is communicated with the combustor. According to the device provided by the utility model, the existing commercially available industrial grade D4 is utilized, the adverse effect of gel on deposition production equipment in the D4 gasification process is relieved, the tolerance requirement of the deposition equipment on the purity of the raw material D4 is increased, and the production cost of the optical fiber preform can be reduced.

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.

Sulfonated poly(phenylene ether) has repeating units of phenylene ether and has a sulfonation degree of 20 to 50% and a molar ratio of sulfonyl chloride (-SO2Cl) to sulfonic acid (-SO3H) of 0.06 or less. Sulfonated poly(phenylene ether) can be used, for example, in membranes for separation based on gas and ion exchange. A method for producing sulfonated poly(phenylene ether) is 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.

The present invention discloses a chitosan-based double cationic anion exchange membrane and a preparation method thereof, which comprises first preparing a Cl ‑ or Br ‑ Cationic guanidine salts with negative ions + Ionic liquid ions, chitosan and initiator are then added thereto, and polyguanidine ionic liquid is obtained by heating and polymerization. The polyguanidine ionic liquid is then coated on a glass plate by a coating method and immediately placed in an anti-solvent to obtain a polyguanidine ionic liquid membrane. The membrane is then immersed in Cu 2+ or Zn 2+ The membrane is immersed in a saturated alkaline solution, then washed with ultrapure water for multiple times, and dried to form a membrane to prepare the chitosan-based double cationic anion exchange membrane. The present invention optimizes the anion exchange membrane, and the anion exchange membrane prepared thereby has better OH ‑ Conductivity and alkaline stability.

The application provides a strong cationic nanofiber membrane and a preparation method thereof, and belongs to the field of protein separation and purification. EVOH is mixed with CAB, a nanofiber with a rough surface and a nano-protrusion structure is prepared by using a melting method, and a nanofiber suspension is obtained by dispersion; then, 3-hydroxypropanesulfonic acid, an alkali agent and glutaraldehyde are added to the nanofiber suspension obtained in step S1 to simultaneously perform cross-linking and grafting modification, and a modified nanofiber suspension is obtained by stirring reaction; finally, the modified nanofiber suspension is uniformly coated on a non-woven fabric substrate, washed after first drying, and secondly dried to obtain a strong cationic nanofiber membrane. The application is favorable for improving the grafting rate of sulfonic acid groups on the nanofiber membrane, obtaining a strong cationic nanofiber membrane, and further improving the adsorption separation efficiency and adsorption capacity of proteins.

The proton exchange membrane comprises a porous framework and boron-based acidic groups bound to the porous framework. The porous framework may be formed of an amorphous or crystalline inorganic material and / or a synthetic or natural polymer. The boron-based acidic groups may be boric acid derivatives, such as cyclic boric acid derivatives, borospiranic acid, or borospiranic acid derivatives. The boron-based acidic groups may be the reaction product of boric acid or a boric acid derivative with a polyhydroxy compound.

The present invention provides a reinforced ion conducting membrane comprising: (a) a reinforcement layer comprising a porous polymer structure; and (b) a polymer ion conducting membrane material impregnated within the porous polymer structure; wherein the porous polymer structure comprises a polymer backbone based on a nitrogen-containing heterocyclic ring, and the polymer ion-conducting membrane material has a transition temperature T [alpha] in the range of from 60 DEG C to 80 DEG C and including end values.