369 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 relates to the technical field of preparation of surfactants, in particular to a PPO / PEO block Gemini ductile surfactant suitable for high-temperature and high-salt oil reservoirs and a preparation method of the PPO / PEO block Gemini ductile surfactant. The preparation method comprises the following steps: by taking fatty alcohol as an initial raw material, carrying out gradual addition on the fatty alcohol, propylene oxide (PO) and ethylene oxide (EO) through a potassium hydroxide / 18-crown ether-6 catalytic system to prepare an APOnEOm intermediate; the preparation method comprises the following steps: carrying out esterification with a polyethylene glycol bismaleate connecting group, and finally sulfonating with sodium hydrogen sulfite to obtain polyethylene glycol bismaleate diester sodium sulfonate (T-APOnEOm-S). By regulating and controlling the PPO / PEO block ratio, the product has excellent temperature resistance and salt resistance, is suitable for high-temperature and high-salt oil reservoirs, has strong emulsifying capacity, can reduce the oil-water interfacial tension to 10 <-3 > mN / m level, and remarkably improves the oil recovery rate. The preparation process is mild in condition and adjustable in product performance, and has important application value in the field of tertiary oil recovery.

The invention discloses a preparation method of a crown ether functionalized anti-pollution nanofiltration membrane, which comprises the following steps: soaking a membrane of a commercial nanofiltration membrane in pure water, and coating the surface with a double-end epoxy compound ethanol solution; uniformly coating the surface of the membrane with an aza 12-crown-4 methanol solution; and drying the membrane in an atmosphere of 40-90 DEG C to obtain the crown ether functionalized anti-pollution nanofiltration membrane. The nano-filtration membrane is realized by chemically grafting aza 12-crown-4 on the membrane surface of a commercial nano-filtration membrane by utilizing a double-end epoxy compound; compared with a traditional nanofiltration membrane, the crown ether functionalized nanofiltration membrane provided by the invention has the advantages that the electronegativity of the surface is reduced, and the surface is similar to an aquatic plant molecular brush structure, so that the deposition of pollutants on the surface of the membrane can be effectively improved, and the anti-pollution performance of the membrane is enhanced; meanwhile, due to the complexing effect of 12-crown-4 molecules on lithium ions, the lithium ions can be effectively captured, concentration polarization of the lithium ions on the surface of the diaphragm is improved, and then the magnesium-lithium separation efficiency of the diaphragm is improved.

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 method for preparing dimethyl carbonate through reaction of CO and methyl nitrite, belongs to the technical field of preparation of dimethyl carbonate, and aims to solve the problem that in the prior art, in the process of preparing dimethyl carbonate through catalysis of reaction of CO and methyl nitrite, the reaction time is short. The preparation method specifically comprises the following steps: in an inert gas atmosphere, mixing and stirring isocyanatopropyltriethoxysilane and N, N-dimethylformamide, raising the temperature of a reaction system to 50-60 DEG C, carrying out a reaction for 1-2 hours, and carrying out a reaction for 1-2 hours, so as to obtain a reaction solution; and 3-aminopropionic acid is added into the reaction system. According to the method, silicon-aluminum coating, potassium modification and 18-crown-6-ether modification are sequentially performed after a halogen-free palladium-copper catalytic system is prepared, so that the conversion rate of impurities and the chromatic value of a product are reduced, the conversion rate of methyl nitrite is effectively increased, and the service life of the catalyst is effectively prolonged.

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.

The present invention discloses a method for preparing enol by selective hydrogenation of alkynol. By adding an acidic substance to adjust the pH value of the reaction system and adding crown ether to inhibit the two main side reactions of self-coupling and over-hydrogenation of terminal alkyne, the purpose of improving low selectivity is achieved. The product has a pure odor and mild reaction conditions.

The invention discloses a crown ether modified nanofiltration membrane for selective separation of lithium and magnesium and a preparation method of the crown ether modified nanofiltration membrane, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: by taking a porous ultrafiltration membrane as a substrate and 2-aminomethyl-18-crown-6 ether and polyamine as water-phase monomers, carrying out interfacial polymerization reaction on the water-phase monomers and trimesoyl chloride on the surface of the porous ultrafiltration membrane to form a polyamide layer; wherein 2-aminomethyl-18-crown-6 ether is introduced into the polyamide separation layer in the form of a covalent bond through a reaction with trimesoyl chloride. The prepared nanofiltration membrane can effectively intercept Mg < 2 + > and provide an exclusive transport channel for Li < + >, so that the Li < + > smoothly crosses the membrane, and the lithium-magnesium separation effect is achieved. The method is simple in preparation process operation, low in energy consumption and easy to amplify, can be used for salt lake lithium extraction, and has a wide industrial application prospect.

The invention discloses a phase transfer catalyst of metal ion complexing crown ether for efficiently preparing aquacide dichloride and application of the phase transfer catalyst. The catalyst is prepared by taking crown ethers as 18-crown-6 and dicyclohexyl-18-crown-6 ether and complex ions as lewis acid active components such as potassium ions, lithium ions, cobalt ions, copper ions and the like through a direct chemical method. The catalyst synergistically catalyzes a nucleophilic substitution reaction of a pyridine derivative and alkyl halide in an aprotic polar solvent such as acetonitrile or nitrobenzene, and synthesis of diquat dichloride can be realized under the conditions of 60-140 DEG C, normal pressure and no oxygen. The mass ratio of the pyridine derivative to the catalyst to the solvent in a reaction system is 1: (0.001-0.05): (5-8), and real-time monitoring and regulation are performed through an online infrared spectrum, a liquid chromatograph and a gas chromatograph-mass spectrometer. The purity of the product is more than 99% after the product is subjected to filtration, recrystallization with an ethanol-water mixed solvent and vacuum drying. The catalyst provided by the invention has the characteristics of high activity, strong stability and recoverability, obviously improves the atom economy of the reaction, simplifies the production process, reduces the energy consumption and pollution, and is suitable for large-scale industrial production.

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 the field of ion separation, and particularly discloses a crown ether-based monovalent / divalent selective cation exchange membrane preparation method, which comprises: carrying out super acid catalysis copolymerization on dibenzo crown ether and a pre-sulfonated monomer to obtain a precursor, and carrying out graft modification on a main chain by using a side chain on the basis to obtain the crown ether-based monovalent / divalent selective cation exchange membrane. The separation performance of monovalent / divalent cations is optimized, and the side chain type cation exchange membrane is prepared. The ion exchange membrane provided by the invention can be used for screening various monovalent / divalent ion systems, the number of # imgabs 0 can reach 370, the number of # imgabs 1 can reach 207, and the number of # imgabs 2 can reach 11125.

The invention discloses a low-dimensional organic-alkali metal-copper (I) halide supramolecular scintillator based on crown ether assisted self-assembly, a synthesis method thereof and application of the low-dimensional organic-alkali metal-copper (I) halide supramolecular scintillator in single crystal X-ray imaging. A series of supramolecular scintillators are successfully synthesized by adopting a supramolecular coordination strategy of crown ether (L) and alkali metal ions (M) and a saturated solution volatilization method. By optimizing the crown ether coordination mode, controllable preparation of large-size single crystals is achieved, the optical and X-ray imaging performance of the large-size single crystals is improved, a new thought is provided for research and development of novel high-performance X-ray scintillators, and the application potential of the supramolecular scintillators in the field of high-resolution single crystal X-ray imaging is expanded.

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 relates to the field of polyacrylamide, in particular to functional polyacrylamide and a preparation method thereof.The functional polyacrylamide is prepared by copolymerization of an acrylamide monomer, an acryloylamino crown ether derivative, a nonionic monomer, an anionic monomer and / or a cationic monomer, an acrylamide structure and a crown ether structure are combined together to synthesize a crown ether monomer with a polymerizable acrylamide group, and the monomer is introduced into a polyacrylamide molecular chain to form a copolymerization product, so that during sewage treatment, heavy metal ions in water are effectively removed while suspended particles are aggregated as a flocculating agent, and the water quality is improved. The heavy metal content after treatment is reduced, and the water treatment agent with multiple effects is formed.

The invention discloses a crown ether cation selective separation membrane and a preparation method thereof. The preparation method comprises the following steps: carrying out super acid catalysis on dibenzo-18-crown-6, terphenyl and isatin in dichloromethane to synthesize a precursor; carrying out affinity substitution reaction on the precursor and a flexible side chain with an ion exchange group through a pre-modification method to obtain a functional precursor; dissolving the functionalized precursor in an organic solvent to form a film casting solution, coating on a glass plate, and heating to volatilize the solvent so as to form a film through curing; and taking down the membrane from the glass plate, acidifying in an acidic aqueous solution, washing with deionized water, and extracting with deionized water to obtain the crown ether cation selective separation membrane. The crown ether cation selective separation membrane has the advantages of relatively high mechanical strength, physical and chemical stability and the like. Meanwhile, the crown ether cation selective separation membrane shows performance superior to that of a commercial membrane in the field of monovalent cation separation, and has wide application prospects in the fields of TMAH purification, salt lake lithium extraction, seawater salt extraction and the like.

The invention belongs to the technical field of high-molecular polymer synthesis, and particularly relates to a high-performance special polyether material with a directionally-modified terminal group and a preparation method of the high-performance special polyether material. The preparation method comprises the following steps: sequentially grafting 4-bromobenzoate to methylene of crown ether and aminating bromine atoms to prepare an intermediate, and reacting amino of the intermediate with isocyanate-terminated polyether to form a urea bond, so that a terminal group of a polyether structure is chemically modified, and a special polyether material is endowed with separation performance; when the composite membrane is applied to a nanofiltration separation membrane, the water permeability can be remarkably improved, and magnesium ions and lithium ions can be efficiently and selectively separated. According to the invention, a terminal group of a polyether structure is chemically modified through a specific reaction, and the application potential of a special polyether material in emerging fields such as high-performance separation membranes is expanded.

The invention relates to an alkylated crown ether synthesis method which comprises the following steps: dissolving a benzo crown ether substrate in a solvent, adding a carbon supported Rh catalyst, and uniformly stirring; under a stirring condition, introducing hydrogen, and carrying out a hydrogenation reaction; and filtering, recovering the carbon supported Rh catalyst, and evaporating to remove the solvent to obtain the alkylated crown ether. Compared with the prior art, hydrogenation of the benzocrown ether substrate is carried out based on the carbon-supported Rh catalyst, and the method has the advantages of low reaction temperature, moderate pressure and rapid reaction, and is suitable for a large-scale production process. Meanwhile, the carbon carrier can be conveniently removed through incineration, chemical recovery of active metal is facilitated, and reduction of the synthesis cost is facilitated.

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 provides a solid additive and a preparation method thereof, positive electrode slurry, a positive plate and a lithium ion battery. The preparation method of the solid additive comprises the following steps: carrying out polymerization reaction on raw materials comprising an organic compound and a functional compound to obtain the solid additive, wherein the organic compound is a pyrene compound and / or an organic framework compound; the pyrene compound is a 1, 3, 6, 8-tetra (4 '-formylbenzene) pyrene ligand and / or 4, 4', 4 '', 4 ''-(pyrene-1, 3, 6, 8-tetrayl) tetraphenylamine; the organic framework compound is a covalent organic framework material COFs and / or a metal organic framework material MOFs; the functional compound is a crown ether compound and / or a Bispidine compound. The solid additive obtained by the preparation method can selectively capture manganese ions, so that the manganese ions are prevented from being dissolved out from a positive electrode, and the cycle stability and the cycle life of the positive electrode are improved.

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.