258 results about "Crown ether" patented technology

The invention relates to a crown ether covalent organic framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a crown ether monomer and an amino monomer in an o-dichlorobenzene solvent, adding a catalyst acetic acid aqueous solution, and uniformly dispersing to form a reaction solution; the method comprises the following steps: freezing a reaction solution through a liquid nitrogen bath, vacuumizing, filling nitrogen, carrying out a heating reaction, and carrying out post-treatment operations such as washing and drying on a reaction product, so as to obtain the crown ether covalent organic framework material BADT-DB18C6-COF. The crown ether covalent organic framework material is formed by condensation of a crown ether aldehyde monomer and an amino monomer, the crown ether monomer is 4, 4 ', 4' ', 4 '''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde, and the crown ether monomer is 4, 4 ', 4' ', 4'''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde. The amino monomer is 4 ', 5'-bis (4-aminophenyl)-[1, 1 ': 2', 1 ''-terphenyl]-4, 4''-diamine. The crown ether covalent organic framework material BADT-DB18C6-COF prepared by the invention is mainly used as an adsorbent, is used for adsorbing and recovering uranium, thorium and americium ions from a solution, shows good adsorption capacity on radionuclides U-238, Th-232 and Am-243, and is particularly suitable for the field of spent fuel post-treatment in the nuclear industry.

The invention discloses an aerogel fire extinguishing agent for fire fighting, a fire extinguishing device and a releasing method.The aerogel fire extinguishing agent for fire fighting is prepared from, by mass, 8-12 parts of silicon dioxide aerogel powder, 40-45 parts of perfluorohexanone, 1.5-2 parts of zinc molybdate, 0.8-1.2 parts of nano cerium oxide, 2-3 parts of hyperbranched polysiloxane and 0.2-0.3 part of 18-crown-6 ether. Solid-phase silicon dioxide aerogel powder is matched with liquid-phase perfluorohexanone, zinc molybdate, nano cerium oxide, hyperbranched polysiloxane, 18-crown-6 ether and the like are compounded to serve as auxiliaries, efficient fire extinguishing can be conducted on precise electrical elements, residues are few, loss of instruments and equipment is small, and the fire extinguishing agent is suitable for being applied to the electrical field.

The invention discloses a multi-scale synergistically enhanced self-healing solid polymer electrolyte and a preparation method thereof, and belongs to the technical field of electrolyte materials. The preparation method of the electrolyte comprises the following steps: S1, adding the eight-arm star polymer, the carborane lithium salt, the neutral plastic crystal additive, the ionic liquid monomer and the crown ether functionalized boron alkene two-dimensional filler into a mixed solvent to form electrolyte slurry; s2, uniformly coating a base material with the electrolyte slurry to form a wet film, and drying the wet film; s3, transferring the dried membrane to an environment filled with inert gas, and initiating in-situ polymerization of an ionic liquid monomer by using ultraviolet irradiation to form a polyionic liquid nanofiber network; and S4, placing the membrane under a vacuum condition at a constant temperature of 120 DEG C for 5 hours to obtain the solid polymer electrolyte membrane. The solid polymer electrolyte membrane provided by the invention overcomes the problems of low ionic conductivity, low lithium ion transference number, insufficient mechanical properties, poor interface stability, narrow electrochemical window and the like of the existing solid polymer electrolyte.

The invention discloses a crown ether functionalized covalent organic framework material as well as a preparation method and application thereof, and the method comprises the following steps: adding a covalent organic framework material, 4-bromobenzo-15-crown-5, potassium carbonate and potassium iodide into an acetone solution for reaction, washing the obtained crude product, performing Soxhlet extraction with tetrahydrofuran for a certain time, and drying to obtain the crown ether functionalized covalent organic framework material. The crown ether functionalized covalent organic framework material is obtained. Compared with a synthesis method of crown ether functionalized COFs in the prior art, the method has the advantages that the crown ether (4-bromobenzo-15-crown-5) can be grafted to the COFs in one step, the Na < + > adsorption capacity and the adsorbent recycling performance are greatly improved, the synthesis method is simple, and synthesis of the crown ether functionalized COFs is greener, more convenient and more economical.

The invention discloses a crown ether grafted polyarylether sulfone ion separation membrane as well as a preparation method and application thereof, and belongs to the technical field of ion separation membranes, collaborative optimization is realized through crown ether accurate grafting and ultrathin ordered membrane formation: a main chain of polyarylether sulfone is grafted with 4 '-aminobenzo-12-crown-4 to form an inherent channel adapted to Li, and the specific surface area of the main chain is increased; the ultrathin film is prepared by a water surface spreading method, and the ion transmission path is shortened. Finally, in a LiCl / MgCl system, Liion flux has high selectivity, high permeation-high selectivity cooperation is preliminarily realized, the chemical synthesis step can be amplified to a kilogram level, and after a DPAES-g-CE / dichloromethane solution is dropwise added to the water surface, the DPAES-g-CE / dichloromethane solution is rapidly spread to form a film without precise equipment; the raw materials are industrial-grade monomers and have no toxic residues, the membrane can be recycled and reused through dichloromethane, the equipment cost is reduced by about 90%, and industrialization is easy; the main chain of the polyaryl ether sulfone is high in rigidity and resistant to high temperature and chemical corrosion; crown ether grafting avoids molecular chain agglomeration, and the swelling rate is far lower than that of a traditional sulfonated membrane.

Provided in the present invention are a preparation method for a crown ether covalent organic framework material, and the use thereof in iodine adsorption. In the present invention, an 18-crown-6-ether group is introduced into the structure of a covalent organic framework (COF) material for iodine adsorption work. The covalent organic framework material can form a one-dimensional pore channel structure in order, and the 18-crown-6-ether can be selectively complexed with iodine molecules, thereby achieving the purpose of efficient iodine adsorption. The material can perform specific iodine adsorption from high-temperature iodine steam, and the iodine steam adsorption capacity of the COF material is as high as 5.56 g / g. The COF material has a high adsorption capacity, is easy to prepare and simple to operate, has a high adsorption efficiency, and is particularly suitable for adsorbing and separating radioactive iodine in the nuclear industry.

The invention discloses a polydopamine modified metatitanic acid type lithium ion sieve and a preparation method thereof, and belongs to the technical field of lithium ion sieves, the preparation method comprises the following steps: grinding and uniformly mixing lithium acetate dihydrate and titanium dioxide in an organic solvent, and calcining the mixture at 650-800 DEG C for 3-5 hours to prepare a Li2TiO3 precursor; the preparation method comprises the following steps: putting dopamine hydrochloride, aminated crown ether and a Li2TiO3 precursor into a tris (hydroxymethyl) aminomethane solution with the pH value of 8-9, carrying out a constant-temperature oscillation reaction, carrying out suction filtration, and drying at low temperature, so as to obtain the polydopamine modified metatitanic acid type lithium ion sieve. According to the lithium ion sieve, the adsorption effect on lithium ions can be improved, the lithium extraction efficiency is improved, and the problem of low adsorption capacity of a lithium ion sieve in the prior art is solved.

The invention relates to a preparation method of triethylene glycol diacetate, and belongs to the technical field of organic synthesis. The method comprises the following steps: adding triethylene glycol, an acetylation reagent and a multifunctional catalyst into a reaction kettle provided with a stirrer, a thermometer and a reflux condensing tube, and stirring and heating for reaction under the protection of nitrogen; after the reaction is finished, cooling reaction liquid to room temperature, and filtering and recovering the catalyst; performing reduced pressure distillation and silica gel column purification on the filtered reaction liquid to obtain triethylene glycol diacetate; the multifunctional catalyst is prepared from mesoporous silicon dioxide microspheres, 3-mercaptopropyltrimethoxysilane, 4-vinyl benzo-18-crown ether, sodium ethoxide, absolute ethyl alcohol, an ethanol solution of tetrabutyl titanate and chlorosulfonic acid. The preparation method comprises the following steps: preparing the mesoporous silicon dioxide microspheres, 3-mercaptopropyltrimethoxysilane, 4-vinyl benzo-18-crown ether, sodium ethoxide, absolute ethyl alcohol, the ethanol solution of tetrabutyl titanate and chlorosulfonic acid; the triethylene glycol diacetate prepared by the method has high yield and high purity, and can meet industrial production and market requirements.

The invention provides a crown ether functionalized covalent organic framework material and a preparation method and application thereof, the crown ether functionalized covalent organic framework material has a structure as shown in a general formula A. Benzocrown ether functional groups are introduced into the structure of the covalent organic framework material through a bottom-to-top method for adsorption separation of lithium ions; and the lithium adsorption capacity is good.

The invention relates to the field of adsorption materials, and discloses a lithium ion adsorbent and a preparation method and application thereof. The lithium ion adsorbent comprises a polyvinyl chloride molecular chain and a polymer molecular chain A, wherein the polymeric molecular chain A comprises a structural unit I from crown ether containing vinyl and a structural unit II from a vinyl silane modified lithium ion sieve. The vinyl silane modified lithium ion sieve in the lithium ion adsorbent can be connected with a polymer molecular chain through a chemical bond, so that the lithium ion sieve can be uniformly dispersed on a polymer skeleton, and the lithium ion adsorbent has excellent structural stability, high adsorption capacity and high magnesium-lithium selectivity; and the solution loss rate of the lithium ion sieve is obviously reduced.

The invention provides a rubidium and cesium adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: providing a doped and modified Prussian blue analogue, wherein the Prussian blue analogue comprises a Prussian blue matrix material and a transition metal doping element doped in the Prussian blue matrix material; granulating a mixed material containing the doped and modified prussian blue analogue and a granulating agent to obtain a rubidium and cesium adsorbent precursor; a mixed reaction system containing the rubidium and cesium adsorbent precursor and a surface modifier are subjected to a reaction, the surface modifier contains one or more functional structures of an amino group, a sulfonic group, a carboxyl group, a sulfydryl group, an acryloyloxy group, an epoxy group, a crown ether structure and a calixarene structure, and therefore the rubidium and cesium adsorbent is obtained. Through a multi-aspect synergistic strategy of transition metal doping, granulation and surface modification, the prepared rubidium and cesium adsorbent has good stability and high adsorption capacity, and has strong selectivity to Cs < + > / Rb < + >.

The technology of the present disclosure generally relates to the field of power storage devices, and more specifically to a solid electrolyte, an electrode, a solid-state battery, and a method for producing the same. An aspect of the present disclosure relates to a process for producing a solid electrolyte, comprising the steps of: - contacting, in the presence of a catalyst: - a polymer precursor compound comprising polyethylene glycol (PEG) and / or polytetrahydrofuran (PTHF), wherein the polymer precursor compound comprises on average per polymer precursor molecule, -at least 2.0 alkoxysilyl functional groups, with a functionality of at least 2.0, preferably at least 2.5, preferably at least 3.0; and / or -at least 1.0 alkoxysilyl functional groups, with a functionality of at least 3.0; - optionally, an organo-tri-alkoxy silane, an organo-tetra-alkoxy silane, and / or a mixture thereof comprising a metal ion (M+) chelating moiety being a cyanurate, a crown ether, an aza-crown ether, a thia-crown ether, a cryptand, a carbamate, a cyano group, a thiocyanate group, or a metallacrown,, - a metal (M+) salt, preferably does the metal salt comprises Li+, Na+, Mg+, Ca+, Al+, and / or a combination thereof, preferably lithium (Li+); - a solvent, preferably an organic solvent; and, - optionally, an ionically conductive compound; thereby obtaining a solid electrolyte; - optionally, drying the obtained solid electrolyte.

The invention relates to a crown ether-loaded solid bubble lithium adsorbent as well as a preparation method and application thereof, belongs to the technical field of lithium adsorption, and solves the problems of low adsorption rate, low adsorption capacity, poor ion selective adsorbability, complex synthesis process, difficulty in separation and recovery, poor regeneration capacity and water environment pollution during lithium extraction of an existing crown ether material. The method comprises the following steps: activating solid bubbles by adopting an alkaline solution; modifying the activated solid bubbles by using a coupling agent; and reacting a crown ether monomer with a lithium salt in a solvent, adding the modified solid bubbles, a catalyst, a cross-linking agent and an initiator, continuously reacting, carrying out solid-liquid separation, washing, drying and eluting. The method is simple and environment-friendly, the stably immobilized crown ether is introduced to the surface of the solid bubble through chemical grafting, and the lithium adsorption performance of the crown ether is improved; the solid bubbles with low density and high stability can endow the adsorbent with the self-floating characteristic, the regeneration performance of crown ether is remarkably improved, and pollution to the water environment is reduced.

The invention relates to the technical field of nanofiltration membrane preparation, in particular to a crown ether functionalized negatively-charged nanofiltration membrane based on secondary interfacial polymerization and a preparation method and application of the crown ether functionalized negatively-charged nanofiltration membrane based on secondary interfacial polymerization. Then, amine-containing crown ether and the initial polyamide membrane are subjected to a secondary interfacial polymerization reaction, amino groups of the amine-containing crown ether react with acyl chloride groups in the initial polyamide membrane, and then the crown ether is firmly fixed to the surface of the nanofiltration membrane through chemical bonds; the cavity structure of crown ether can specifically recognize lithium ions and provide an exclusive transmission channel for the lithium ions, meanwhile, the interception capacity of magnesium ions is improved, and the lithium-magnesium separation capacity is effectively improved. The method is low in energy consumption, the obtained nanofiltration membrane is large in flux, the separation process is not influenced by the charge effect, and the separation efficiency of lithium and magnesium ions is high. The crown ether functionalized negatively charged nanofiltration membrane is applied to lithium-magnesium separation of salt lake brine and has a good application prospect.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of an olefin monomer of benzocrown ether imidazole polymerized ionic liquid. Comprising the following steps: adding benzo-12-crown-4-ether, iodo-alkyl acid and polyphosphoric acid into a heat preservation kettle, carrying out heating reaction, adding chloro-alkyl acid, carrying out heating reaction, dropwise adding water to hydrolyze residual polyphosphoric acid, extracting an organic phase by chloroform, washing chloro-alkyl acid by using a sodium carbonate aqueous solution, drying, carrying out suction filtration, and transferring into a reaction kettle; adding 1-methylimidazole, carrying out heating reaction, carrying out rotary evaporation to obtain chloroform, adding dioxane, triethylamine and hydroquinone, carrying out heating reaction, and carrying out rotary evaporation to obtain dioxane; the ionic liquid, organic salt and pure water are added into a dissolving kettle, dichloromethane is used for extracting an organic phase, pure water is used for washing chloride ions and iodide ions in the organic phase, dichloromethane is obtained through rotary evaporation, and a product is dried in vacuum. According to the method, the steps of acylation, quaternization and dehydrohalogenation are used, so that the steps are simplified, and the purification treatment process of acylation after quaternization is avoided.

The invention belongs to the technical field of organic silicon synthesis, and particularly relates to low-ring-content silicone oil and a preparation method thereof, and the silicone oil comprises the following components in percentage by mass: 92-97% of DMC, 0.2-0.8% of crown ether, 0.5-2% of a phosphazene alkali silicon alkoxide catalyst, 0.4-2% of a phosphosilyl ester neutralizer and 0.35-3.5% of divinyl tetramethyl disiloxane. The novel phosphazene alkali silicon alkoxide catalyst and the phosphoric acid silicon ester neutralizer are adopted, so that the'back-biting 'cyclization phenomenon is greatly restrained in the polymerization process, and the reaction conversion rate and efficiency are improved; the Fe3O4-beta-cyclodextrin composite material is selected as an adsorbent of a ring body, so that the content of cyclosiloxane is reduced, the magnetic recovery rate is high, the thermal stability is high, and the biological safety is better; the volatile component content of the prepared low-ring-content silicone oil is less than 0.2% (150 DEG C / 3h), the ring content (D3-D10) is less than 200ppm, and the ring content meets the requirements of electronics, food and medical levels.

This application discloses a crown ether modified perfluorosulfonic acid resin, its preparation method, its application, and an ion exchange membrane. The main chain of the crown ether modified perfluorosulfonic acid resin is a perfluorocarbon chain. The crown ether modified perfluorosulfonic acid resin includes repeating unit A, which is shown in formula (1): Formula (1); In formula (1), R0 is a crown ether group, a is a positive integer from 0 to 6, and b is a positive integer from 2 to 5. This application can effectively improve the persistence of the ion exchange membrane's free radical quenching effect, while also improving the oxygen resistance of the ion exchange membrane.

The application discloses a preparation method of perfluoroalkyl aryl sulfide, and a structural formula of the perfluoroalkyl aryl sulfide is shown as formula (I); the method comprises the following steps: firstly, obtaining corresponding aryl sulphenyl chloride by chlorination of thiophenol; under the condition that fluoride and crown ether exist, obtaining perfluoro-1,1-dimethylbutyl negative ion by addition of D-2 ‑ And the aryl sulphenyl chloride added is subjected to a nucleophilic substitution reaction to synthesize a product (1,1,1,3,3,4,4,5,5,5-decafluoro-2-trifluoromethylpent-2-yl)(aryl)sulfide. The application adopts a reaction strategy of efficient coupling of thiophenol and perfluoroalkyl, and can be used for preparing various fluorine-containing benzene sulfide compounds.

The invention provides a 1, 4-diaza-butanetriene compound as well as a synthesis method and application thereof, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: carrying out a first reaction on a compound 1 and a compound 2 in a solvent A, removing the solvent A after the reaction is finished, extracting with benzene or toluene, filtering, mixing with 12-crown ether-4, and stirring to obtain a compound 3; the synthesis method of the compound 3 provided by the invention is high in yield, simple to operate, mild in reaction, simple in required reaction condition control and high in speed. The obtained compound 3 has excellent stability and can be used for key intermediates in various organic reactions, such as preparation of alpha-diimine ligands.

This invention discloses a liquid-liquid extractant for separating chloride ions, its preparation method, and its application, belonging to the field of industrial wastewater treatment and resource utilization technology. This invention introduces a diaza-18-crown-6-ether fragment into the calix[4]pyrrole skeleton via a Click reaction, successfully preparing a diaza-18-crown-6-ether-bridged calix[4]pyrrole acceptor. This acceptor utilizes the strong coordination ability of crown ethers to alkali metal cations and the strong binding ability of calix[4]pyrrole to chloride ions, exhibiting excellent binding ability to alkali metal chlorides, especially showing extremely high selectivity for sodium chloride. Based on this performance, the compound can be used as a liquid-liquid chloride ion extractant in aqueous solutions. This extractant requires no co-extractant during chloride ion extraction, has an extraction efficiency >99%, and the extraction process is simple and rapid. Furthermore, the extractant can be recycled by reverse extraction of alkali metal chlorides in the organic phase using pure water, demonstrating good application value and broad development prospects in the chloride ion treatment of industrial wastewater.

The present invention provides a material comprising (i) a crown ether of formula (I), (ii) a crown ether of formula (II), and / or (iii) a crown ether of formula (III), or a salt thereof, wherein each m is independently an integer from 1 to 8, p is an integer from 1 to 1000, each "(F)" represents an optional bond and / or structure, each X is an optional substituent, and each * independently represent -H, =O, or a bond to the remainder of the substance, provided that at least one * is the bond to the remainder of the material, and the remainder of the material is attached via an sp3-sp3 carbon-carbon bond, methods of making the material, and methods of using the material are provided. [Formula 1] JPEG2025535965000092.jpg69149

The invention discloses an ordered ion channel polyamide nano composite membrane, a preparation method and application, relates to the field of lithium magnesium membrane separation, and aims to solve the problem of poor selectivity in the prior art. The technical scheme is as follows: amino benzo crown ether is covalently grafted on an ultrafiltration base membrane in situ through diazotization-coupling reaction; then, a polyamide compact layer is prepared on the crown ether nano layer subjected to in-situ self-assembly through interfacial polymerization, and the polyamide nano composite membrane with the ordered ion transmission channel is jointly constructed. The residual amino groups on the surface of the in-situ covalent grafted crown ether nano layer can also participate in interfacial polymerization reaction, so that the ordered ion channel crown ether macromolecular layer and the polyamide compact layer are connected through chemical bonds to jointly form the polyamide nano composite membrane with the ordered ion transmission channel. And the method is suitable for extracting lithium from the salt lake brine.

The invention relates to a titanium silicalite molecular sieve and a preparation method and application thereof in organic catalytic reaction, and the preparation method comprises the following steps: (1) mixing a titanium source, a crown ether compound and an optional solvent to obtain a titanium-containing precursor solution; (2) performing hydrolysis treatment on the titanium-containing precursor solution, a silicon source and a template agent in a contact manner to obtain a hydrolysis mixture; and (3) carrying out hydrothermal crystallization treatment, drying treatment and roasting treatment on the hydrolysis mixture. The problem that the content of non-framework titanium of the titanium silicalite molecular sieve is high can be effectively solved, and the catalytic activity of the titanium silicalite molecular sieve in an organic catalytic reaction is improved.

This invention discloses a method for preparing and analyzing trans-4-aminocyclohexylacetic acid. The preparation method is as follows: 4-nitrophenylacetic acid undergoes catalytic hydrogenation in a solvent, followed by filtration. The filtrate is then treated with acid to obtain a 4-aminophenylacetic acid salt solution. The collected catalyst is activated. The 4-aminophenylacetic acid salt solution is mixed with isopropanol, barium hydroxide, tetrabutylammonium bromide, 18-crown ether-6, and dibutyl phthalate. The activated catalyst is then added to initiate a catalytic hydrogenation reaction. After the reaction, the reaction solution is cooled and filtered. The resulting solid is mixed with a preheated dilute sulfuric acid solution and stirred to form a slurry. The mixture is then filtered, and the filtrate is neutralized and filtered again. The collected filtrate is concentrated and crystallized. The crystallized precipitate is washed and dried to obtain trans-4-aminocyclohexylacetic acid. The method provided by this invention has high reaction efficiency, mild conditions, and is suitable for industrial production. It yields high product purity and reliability. Furthermore, the analytical method provided by this invention is accurate and reliable.

The application discloses a cross-linked polyaryl piperidine anion exchange membrane and a preparation method and application thereof, and relates to the technical field of anion exchange membranes. The anion exchange membrane takes polyaryl piperidine as a skeleton, introduces crown ether structure and a cross-linked network, and solves the technical problem that the balance between the hydroxyl ion conductivity and the dimensional stability is difficult in the existing anion exchange membrane. The anion exchange membrane comprises a specific structure of a repeating unit, is prepared through Friedel-Crafts superacid catalytic polymerization, Menshutkin reaction functionalization and Michael addition reaction cross-linking, and has excellent hydroxyl ion conductivity, dimensional stability, chemical stability and mechanical strength. The preparation method is simple in operation, fast in polymerization rate, and high in conversion rate, does not need to strictly control the temperature and oxygen of a reaction environment, is suitable for the field of water electrolysis hydrogen production, especially suitable for an anion exchange membrane water electrolysis system, and has a wide industrial application prospect.

The application provides a high-styrene solution polymerized styrene-butadiene rubber and a preparation method and application thereof, and the preparation method comprises the following steps: mixing styrene, butadiene, an initiator, a structure regulator and a non-polar solvent, and performing a polymerization reaction to obtain solution polymerized styrene-butadiene rubber; wherein the structure regulator comprises at least two of t-butoxy sodium, t-amyl oxy sodium, 2,3-dimethyl-3-pentanol sodium and ethylene glycol disodium, and a crown ether. By using the composite structure regulator, the application can prepare a random high-styrene content solution polymerized styrene-butadiene rubber, and the rubber almost does not contain styrene blocks, and the content of vinyl in the rubber can be adjusted by the addition amount of the structure regulator. Therefore, the solution polymerized styrene-butadiene rubber prepared by the application has good strength and hardness due to the high styrene content, and the random microstructure reduces the glass transition temperature and heat build-up of the raw rubber, and is suitable for the manufacturing of high-performance tires such as new energy vehicle tires.

The invention discloses a hierarchical pore UiO-66 supported crown ether composite material, a preparation method thereof and application of the hierarchical pore UiO-66 supported crown ether composite material in adsorption and extraction of 6Li < + > from complex systems such as salt lake brine. The preparation method comprises the following steps: preparing terephthalic acid, 2-aminoterephthalic acid and a zirconium source through a solvothermal method to obtain a mixed ligand UiO-66, and then pyrolyzing the mixed ligand UiO-66 in an air atmosphere to obtain the hierarchical pore UiO-66; the hierarchical pore UiO-66 and a crown ether solution are mixed and stirred to react for a period of time, then solid-liquid separation is carried out, solids are collected, and the hierarchical pore UiO-66 loaded crown ether composite material is obtained after cleaning and drying. The hierarchical pore UiO-66 loaded crown ether composite material has the advantages of high specific surface area, high dispersion of crown ether adsorption sites, high crown ether loading capacity, high selectivity of 6Li < + > metal ions and the like, and can realize one-step enrichment of 6Li < + > metal ions in complex systems such as salt lake brine.

Treatment fluids and methods for dissolving titanium-iron oxides and iron oxides in a wellbore. A treatment fluid includes an activator selected from the group consisting of chlorophyll, pheophytin, hydroxylammonium chloride, dopamine, crown ethers, cryptands, ethanoloamine, trihydroxamate-containing siderophores, salts thereof, and any combination thereof, an acid and / or acid-generating agent, and an aqueous base fluid. The treatment fluid contacts a titanium-iron oxide and / or iron oxide to dissolve the titanium-iron oxide and / or iron oxide.

The application belongs to the technical field of flame retardant materials, and particularly relates to a low-ion-precipitation type halogen-free flame retardant for electronic products and a preparation method thereof. The method uses a phosphorus-nitrogen type halogen-free flame retardant as raw material, first generates active sites on the surface of the flame retardant powder through low-temperature plasma irradiation, then generates a silane coupling agent containing a crown ether group in situ in anhydrous ethanol by pre-reaction of the silane coupling agent and a hydroxymethyl crown ether, adds deionized water to start hydrolysis and polycondensation, forms a crown ether functionalized polysiloxane crosslinking layer in situ on the surface of the particles, and finally drives the free sodium and potassium ions in the particles to diffuse outward and be selectively complexed, captured and fixed by the crown ether layer under the condition of ultrasonic-assisted warm water immersion washing. The application solves the problem of the deterioration of the electrical properties of a polymer insulating material in a humid heat environment caused by residual ion impurities of the flame retardant.

The application discloses a method for synthesizing battery-grade high-purity lithium sulfide by a liquid-phase method. The specific steps are as follows: lithium salt is dissolved in solvent X to form a lithium salt solution, anhydrous M2S and crown ether are dissolved in solvent X to form an M2S solution, the lithium salt solution is added into a reaction kettle, argon is filled to replace, the M2S solution is added into the reaction kettle, stirring is conducted, then anti-solvent Y is added into the reaction kettle, stirring is conducted to obtain a suspension system, solid crude lithium sulfide is discharged from the lower end of the reaction kettle, organic solvents are recovered by rectification to recover solvent X, anti-solvent Y and crown ether respectively, the crude lithium sulfide is vacuum dried, is placed into a rotary furnace, inert gas is introduced, and calcination is conducted to remove organic carbon and sulfur, so that battery-grade high-purity lithium sulfide products are obtained, and the crown ether is recycled and used. The crown ether is introduced to form a complex with alkali metal ions, the concentration of sulfur ions in the organic solvent is improved, the reaction rate of lithium sulfide is promoted, the formation of LiMS by-products is effectively avoided, and the yield and purity of Li2S are improved.