32 results about "Superacid" patented technology

The present invention relates to the field of catalyst technology, and more specifically to a mesoporous bifunctional catalyst, its preparation method, and application, and a method for preparing dicyclohexylbenzene. The mesoporous bifunctional catalyst has an average pore diameter of 5 nanometers or greater and contains at least 100 μmol / g of strong acid centers. The mesoporous bifunctional catalyst comprises: 10-30% by weight of an acidic silica-alumina composite; 50-65% by weight of an MCM-41 molecular sieve; 5-10% by weight of a solid superacid; and 1-15% by weight of a hydrogenation metal component. The mesoporous bifunctional catalyst has high catalytic activity and is used to prepare dicyclohexylbenzene, achieving high dicyclohexylbenzene yields and low reaction energy consumption.

A method for selectively removing sodium or potassium from an alkaline lithium-containing aqueous solution, the method comprising: (i) contacting the alkaline lithium-containing aqueous solution with a hydrophobic solution comprising: (a) an aqueous-insoluble hydrophobic solvent, (b) a protic ionic liquid of the formula X-Y+, wherein X- is a conjugate base of a superacid and Y+ is a protonated cation, and (c) at least one of lipophilic sodium-selective and potassium-selective complexing ligands, wherein the contacting step results in selective complexation with and removal of sodium and / or potassium ions from the lithium-containing aqueous solution into the hydrophobic solution along with simultaneous abstraction of a proton from Y+ to form Y; and (ii) separating the aqueous solution from the hydrophobic solution, wherein, in some embodiments, X- is a bis(sulfonyl)imide and Y+ is a protic ammonium species. The method may further include stripping sodium and potassium ions from the hydrophobic solution and regenerating Y+.

The invention discloses a supported catalyst and application thereof in synthesis of difluoroacetyl fluoride, the supported catalyst comprises a carrier and active components, the active components comprise superacid and an active auxiliary agent; in the supported catalyst, the loading capacity of the superacid is 20 wt%-25 wt%, and the loading capacity of the active auxiliary agent is 5 wt%-10 wt%; the superacid is selected from at least one of fluoboric acid, fluorosulfonic acid, fluoroantimonic acid and carborane acid; the active auxiliary agent is selected from at least one of molybdenum nitrate, technetium nitrate, ruthenium nitrate, rhodium nitrate and chromic nitrate; when the supported catalyst is used for synthesizing difluoroacetyl fluoride, 1, 1, 2, 2-tetrafluoroethyl ethyl ether is used as a raw material, hydrogen fluoride is added under the action of the supported catalyst to inhibit generation of ethylene, and difluoroacetyl fluoride and fluoroethane are generated through cracking under relatively mild conditions; compared with an existing preparation method, the conditions are milder, and the one-way yield is larger than 95%.

The invention relates to a method for catalytically synthesizing a large-size single crystal covalent triazine framework (CTF) by using a mercury-based quantum dot dynamic interface. According to the method, the efficient catalytic synthesis of the aromatic dinitrile monomer is realized through the dynamic action of the mercury-based quantum dots at a superacid liquid-liquid interface. The preparation method comprises the following specific steps: firstly, dispersing aromatic dinitrile monomers and oleic acid coated mercury-based quantum dots in an organic solvent to form a precursor dispersion liquid; then slowly injecting the solution into superacid to form a clear liquid-liquid two-phase interface; under the conditions of proper temperature and rotating speed, inducing the monomers to be orderly assembled and grow through active species released by the mercury-based quantum dots; and finally, cleaning and drying to obtain the large-size CTF single crystal with high crystallinity. According to the method, the soft template effect of the mercury-based quantum dots and a super-acid enhanced reversible error correction mechanism are utilized, so that the nucleation entropy change can be effectively inhibited, and the crystal quality can be improved.

The application discloses a solid superacid catalyst and a preparation method and application thereof, and relates to the technical field of catalysts, and specifically discloses the preparation method of the solid superacid catalyst, which comprises the following steps: dissolving a zirconium source, a titanium source, silica sol, urea and hexadecyl trimethyl ammonium bromide in water to prepare a precursor solution; heating the precursor solution to react, wherein the pH value of the system is increased from acidity to alkalinity during the reaction, and a reaction slurry is obtained; performing hydrothermal aging treatment on the reaction slurry, and then collecting the obtained precipitate; treating the precipitate with a rare earth salt solution to obtain a rare earth modified product; immersing the rare earth modified product in a sulfuric acid solution; and performing calcination on the immersed product to obtain the solid superacid catalyst. The solid superacid catalyst provided by the application has a regular sheet-like morphology and a composite structure of silica-rare earth synergistically anchoring sulfate, can guarantee high catalytic activity, realize strong anchoring of active components and rapid separation of the catalyst, and significantly improves the recycling stability.

A process is provided which includes contacting a haloalkane reactant with a fluorination agent in the liquid phase, in the presence of a catalyst, under conditions which are free of or substantially free of a superacid, to produce a product stream including a haloalkane product, preferably a hydro(chloro)fluorocarbon.

The application discloses a preparation method of hexamidine. The preparation method is as follows: 1,6-(p-cyanophenyl) hexane diether (I) is subjected to alcoholysis reaction with alcohol under the catalysis of a solid superacid, and after the reaction, compound (II) is obtained; the solid superacid is removed through filtration, then ammonia is directly added into the filtrate to generate aminolysis reaction, and hexamidine shown in formula (III) is prepared. The solid superacid is selected to replace traditional acid and alkali, the solid superacid can be recycled for multiple times, the reaction process is simple, green and environment-friendly, the yield is high, and the method is suitable for large-scale industrial production.

The invention provides a silane modified polyether sealant. The sealant is prepared from components including silane modified polyether resin and a coupling agent, the mass ratio of the silane modified polyether resin to the coupling agent is 100: (1-3); the preparation method of the coupling agent comprises the following steps: under the protection of nitrogen, mixing ether, a first catalyst and epoxy silane, reacting at 55-65 DEG C for 2-3 hours, removing alcohol, distilling at 100-110 DEG C and 0.06-0.04 MPa until no bubbles are generated, adding an amino silane coupling agent, reacting at 70-80 DEG C until the viscosity of the system is not obviously increased, cooling and filtering; the first catalyst is organic tin lewis acid, sodium alkoxide, potassium alkoxide, solid superacid or solid alkali. According to the invention, only a small amount of the coupling agent obtained by a specific preparation method is needed, so that the bonding strength and the light transmittance of the sealant can be improved while the elastic recovery rate of the sealant is not reduced and the low VOC release is ensured.

The application discloses an integrated process for preparing bio-jet fuel by converting waste oil through coupling solid acid pre-esterification and hydrodeoxygenation, and belongs to the technical field of bio-jet fuel, wherein the process is characterized in that: first, in-situ removal of esterification water is realized by using a molecular sieve shape-selective adsorption under the action of a bifunctional catalyst composed of WO3 / ZrO2 super acid and 3A molecular sieve, so as to promote the balance conversion; then, the outlet material is directly introduced into a hydrodeoxygenation reactor with NiW / ZrO2-Al2O3 as a water-resistant catalyst without any intermediate separation, so as to realize long-period stable operation. In conclusion, the traditional deacidification section is omitted, the total liquid hydrocarbon yield is more than 94%, and the single-pass life of the catalyst is up to 820 hours, so the process has a great industrial application prospect.

The invention provides a catalyst-free photoreaction method based on pyrrolo [1, 2-a] quinoxaline and a derivative thereof and an azo compound, and a product, and belongs to the technical field of chemistry. The pyrrolo [1, 2-a] quinoxaline and the derivative thereof are used, amination reaction of the azo compound is realized under the condition of visible light induction, formation of C-N bonds can be directly and efficiently induced through blue light (456nm), a new strategy is provided for C-N coupling reaction of the pyrrolo [1, 2-a] quinoxaline and the derivative thereof with the azo compound, the highest yield can reach 95%, and the method is suitable for industrial production. Compared with the existing method for catalyzing the amination reaction by using catalysts such as super acid, noble metal and fluorine-containing solvent, the method disclosed by the invention is safe and mild in reaction condition, green and environment-friendly, conforms to the green chemistry concept, and is beneficial to reducing the energy consumption and the environmental influence.

The invention relates to a chemically amplified positive photosensitive composition, a photosensitive dry film and a method for producing the same, a patterned resist film, a substrate with a casting mold, and a method for producing a plated molded article. The present invention addresses the problem of providing a chemically amplified positive photosensitive composition which is capable of forming a patterned resist film having a rectangular cross-sectional shape, has good stability over time after exposure, and is capable of suppressing development residues. The solution of the present invention is a chemically amplified positive photosensitive composition containing an acid generator (A) that generates an acid by irradiation with active light or radiation, a resin (B) whose solubility in a base is increased by the action of the acid, a sulfur-containing compound (E), and an acid diffusion control agent (F), the acid generator (A) contains an acid generator (A1) capable of generating a superacid having a van der Waals volume of no more than and a pKa of-6.5 or less and-10 or more.

The invention provides a 260 DEG C superhigh temperature resistant modified fatty acid oil-based drilling fluid wetting agent as well as a preparation method and application thereof, and belongs to the field of oilfield chemistry in the petroleum industry. The preparation method of the wetting agent comprises the following steps: mixing ricinoleic acid and a base material fatty acid, carrying out dehydration treatment, adding a solid superacid catalyst I, and adding polyol for reaction; after the reaction is finished, filtering to obtain modified fatty acid; carrying out dehydration treatment on the obtained modified fatty acid, adding a solid superacid catalyst II, adding a grafting reagent containing an epoxy group, and carrying out ring-opening grafting reaction; then adding a polyhydroxy compound, and carrying out esterification cross-linking reaction; adding a high-temperature stabilizing aid into the obtained reaction liquid, and carrying out curing treatment; and cooling the obtained filtrate, adding an oil-phase dispersion medium, and uniformly stirring to obtain the oil-phase dispersion medium. The wetting agent provided by the invention can reduce the oil-solid interfacial tension and improve the wettability of the oil-based drilling fluid to drilling cuttings, well wall rocks and weighting materials.

The invention belongs to the technical field of organic synthesis and catalytic chemistry, and particularly relates to a synthesis method of triethylene glycol divinyl ether. The invention provides a compound of neutral ionic liquid and strong acid, and the compound is used as a catalyst for ethynylation reaction of alcohol and acetylene. Specifically, a compound of 1-butyl-3-methylimidazole bis (trifluoromethane sulfonimide) salt and trifluoromethanesulfonic acid is used for catalyzing the reaction of triethylene glycol and acetylene to prepare the triethylene glycol divinyl ether. The catalyst has super-strong acidity and good stability to water and air, is immiscible with a product, and creates an efficient and safe catalytic environment; the side reaction is effectively inhibited, the product purity is good, and the yield can reach 90% or above; and the catalyst and the product are automatically layered, separation and recovery are simple and convenient, the recovery rate is high, the catalyst can be repeatedly used for multiple times without obvious reduction of activity, and cyclic utilization of the catalyst is realized.

The application belongs to the technical field of industrial catalysis, and particularly relates to a solid superacid catalyst and a preparation method and application thereof. The preparation method provided by the application comprises the following steps: twice adjusting the pH of a solution by using ammonia water to obtain a metal salt precursor, and acidifying the metal salt precursor to obtain the solid superacid catalyst. It can be seen that the raw material for preparing the catalyst is cheap and easy to obtain, and the preparation process is simple and green. The catalyst with a core-shell structure has excellent catalytic performance, and the conversion rate of reactants is still higher than 98% after the catalyst is repeatedly used for 5 times, so that the catalyst can be repeatedly used for many times and has the advantages of small energy consumption. When the catalyst is used for synthesizing bisphenol compounds, the conversion rate of reactants reaches 99.91%, and the product selectivity reaches 99.86%, so that the catalyst has a wide application prospect.

The application discloses an aromatic hydrocarbon refining agent and a preparation method and application thereof. The refining agent comprises a composite metal oxide and a solid super strong acid, the metal comprises divalent metal A and trivalent metal B, wherein the atomic molar ratio of A / (A+B) is 0.45-0.81; the preparation method of the refining agent comprises the following steps: a solution containing metal A and metal B is reacted with a mixed solution of sodium hydroxide and sodium carbonate, the obtained mixture is further reacted and calcined to obtain a composite metal layered oxide I, the composite metal layered oxide I is sequentially treated by a strong base and an acid to obtain a composite metal oxide II; then the solid super strong acid is loaded to obtain an aromatic hydrocarbon refining agent intermediate; finally, ammonium exchange and calcination are carried out to obtain the aromatic hydrocarbon refining agent. The prepared refining agent can solve the problem of poor dispersion of the super strong acid, improve the reaction activity of the super strong acid, and greatly prolong the service life of the refining agent.

The invention discloses a preparation method of a compound solid superacid dimethyl ether catalyst. The method comprises the following steps: 1, preparing tungsten oxide-zirconium oxide solid superacid; and 2, preparing the titanium oxide solid superacid. And 3, mixing and kneading the two solid superacid, the gamma alumina carrier and the binder according to corresponding mass, adding rare earth element dysprosium by an equivalent-volume impregnation method, drying and roasting to obtain the required compound solid superacid dimethyl ether catalyst. The dimethyl ether catalyst prepared by the invention has the characteristics of high conversion rate and good selectivity, and especially has better anti-interference capability on water, alcohol, ester, organic acid and acetone.

The invention belongs to the technical field of preparation of alkenyl succinic anhydride, and particularly relates to a preparation method of high-purity alkenyl succinic anhydride. Mixing 1-octadecene and 1-hexadecene with the sulfuric acid modified zirconium-based MOF catalyst and the antioxidant, and carrying out microwave-assisted isomerization; the preparation method comprises the following steps: dispersing a maleic anhydride cyclohexane solution through a PDMS film, and adding a tungstate supported silicon dioxide-cellulose nanofibril composite catalyst to carry out an addition reaction; and oxidizing the reaction liquid with ozone, and performing membrane distillation and refining through a PTFE hydrophobic membrane. According to the method, the isomerization efficiency is improved through an ordered mesoporous structure and a super acidic site of a sulfuric acid modified zirconium-based MOF catalyst, the reaction temperature is reduced through microwave assistance, mass transfer is improved through PDMS membrane dispersion, maleic anhydride homopolymerization is inhibited through a composite catalyst, and low-temperature efficient refining is achieved through ozone-membrane distillation. Compared with the prior art, the method has the advantages of high olefin conversion rate, high ASA addition selectivity and purity and low energy consumption, and solves the problems of incomplete isomerization, thermal runaway and insufficient purity in the prior art.

The invention belongs to the technical field of catalysts, and particularly relates to a preparation method of double-carrier solid superacid, and the double-carrier solid superacid is SO4 < 2-> / TiO2-ZrO2; the preparation method specifically comprises the following steps: S1, weighing butyl titanate, dissolving butyl titanate in an ethanol solvent, and adding a glacial acetic acid solution under stirring at room temperature; s2, weighing zirconium n-propoxide, adding the zirconium n-propoxide into the solution obtained in the step S1, adjusting the pH value, and stirring until the reaction mixture is gelatinized under a constant-temperature condition; s3, soaking the gel in the step S2 in absolute ethyl alcohol, washing the gel, and drying and grinding the gel to obtain gel powder; soaking the gel powder, carrying out suction filtration, drying a filter cake, and grinding to obtain solid powder; and S4, dipping the solid powder obtained in the step S3 in an H2SO4 solution, carrying out suction filtration, drying a filter cake, grinding, crushing, and roasting at a high temperature to obtain the solid superacid SO4 < 2-> / TiO2-ZrO2.

The present invention relates to the field of hydrogen energy, and more particularly to an anion-conducting polyelectrolyte comprising an amide group, a preparation method and application thereof. The method includes: polymerizing aromatic hydrocarbons and ketone comprising amide group by superacid catalysis, forming a membrane by a casting method, performing the membrane prepared under alkaline conditions to obtain theanion-conducting polyelectrolytes comprising amide group. Theanion-conducting polyelectrolytes obtained have good solubility and excellent stability. It is a kind of high molecular polymer with excellent alkali stability with an amide structure on the backbone. After alkaline treatment, the polymer not only has high hydroxide conductivity, good mechanical properties, and thermal stability but also has excellent alkali stability and excellent performance of water electrolysis.

The invention relates to the field of anion exchange membranes, in particular to a high-stability and high-flexibility anion exchange membrane and a preparation method thereof.The preparation method comprises the steps that S1, alpha, omega-diphenylalkane, tribenzylamine and 4-imidazole formaldehyde are dissolved in an organic solvent, and a branched polymer is prepared through a one-pot polycondensation reaction and purification treatment under the catalysis of superacid; s2, carrying out quaternization treatment on the purified branched polymer to obtain a quaternized polymer; s3, dissolving the quaternized polymer in a film-forming solvent, and casting to form a film; and S4, carrying out ion replacement on the obtained membrane to obtain the hydroxyl type anion exchange membrane. The defects of poor stability, insufficient flexibility and the like of the anion exchange membrane are overcome, unstable factors are eliminated from the source from technologies of molecular level design, comprehensive branched structure construction, flexible chain segment introduction, Cardo structure deletion and the like, and the anion exchange membrane with rigidity and softness is prepared.

The application discloses a preparation method of vanillin, and steps include: (1) mixing guaiacol, formyl chloride, carbonate and / or bicarbonate and an organic solvent to generate a nucleophilic substitution reaction, and obtaining a reaction solution containing 2-methoxy-1-formic acid benzyl ester; (2) filtering the reaction solution of step (1), and then adding solid superacid to the reaction solution, so that the 2-methoxy-1-formic acid benzyl ester generates a Fries rearrangement reaction under catalysis of the solid superacid to generate vanillin. The method is simple and efficient, has high atom utilization rate, less waste, and the solid superacid can be used as a Fries rearrangement reaction catalyst to improve the selectivity and conversion rate of the reaction, the catalyst is easy to separate and recycle, the catalyst has long service life, the production cost can be effectively reduced, and the production efficiency is improved.

The application relates to the field of catalysts, and discloses a composite solid acid catalyst as well as a preparation method and application thereof. The composite solid acid catalyst contains a silicon-aluminum molecular sieve, a first metal active component, sulfate ions and a second metal active component; the first metal active component is selected from at least one of non-noble metal elements in groups IVB, VB, VIB, VIIB and VIII; the second metal active component is selected from at least one of noble metal elements; wherein the proportion of the amount of super strong acid with H0<-12 in the total amount of H0<-3 in the catalyst is more than 20%. The composite solid acid catalyst is suitable for treating complex hydrocarbon raw materials, is applied to reactions such as aromatic hydrocarbon isomerization, dismutation and alkyl transfer, dealkylation or hydrocracking, and has the advantages of high reaction activity and high product selectivity.

The invention belongs to the technical field of inorganic chemical industry and material chemistry, and particularly relates to a method for preparing high-purity anhydrous chromium trichloride based on direct dehydration of solid acid. The method comprises the following steps: uniformly mixing pretreated chromium trichloride hexahydrate and solid superacid in proportion in an inert atmosphere; placing the mixture in a tubular reactor, and carrying out temperature programming stepped dehydration in a flowing dry inert gas or vacuum environment; and after the reaction is finished, cooling to room temperature in inert gas flow, extracting and separating by using an organic solvent or screening and separating, and drying in vacuum to obtain the anhydrous chromium trichloride. According to the method, the solid acid is directly used as the main dehydrating agent and the catalyst, the chromium trichloride hexahydrate is efficiently converted into the high-purity anhydrous chromium trichloride through the one-step method, the technological process is simple, the conditions are mild and safe, and the product is high in purity and environmentally friendly.

The invention belongs to the field of pharmaceutical and chemical engineering, relates to a green preparation method of an anti-influenza virus derivative key intermediate dibenzoselenoheptanone compound, and belongs to the field of pharmaceutical and chemical engineering. According to the preparation method, N, N-dimethylformamide and oxalyl chloride are utilized to perform in-situ activation on carboxylic acid to obtain an acyl chloride intermediate, then an intramolecular Friedel-Crafts acylation reaction is performed under promotion of cheap lewis acid anhydrous AlCl3 or FeCl3 and superacid TMSOTf, the dibenzoselenoheptanone compound is efficiently prepared, and particularly, the invention relates to preparation of 7, 8-difluorodibenzo [b, e] selenoheptyl-11 (6H)-ketone. According to the synthesis method disclosed by the invention, the use of polyphosphoric acid in an existing synthesis route is avoided, and the reaction is completed in a mild temperature range of 0-25 DEG C by introducing superacid, so that the problem that the dibenzoselenoheptanone compound is unstable at a high temperature and is difficult to prepare is effectively solved; and meanwhile, the harsh requirement of repeated heating and cooling in the original process is avoided, the reaction time is remarkably shortened, the energy consumption is reduced, the comprehensive production cost is effectively reduced while the process safety is improved, and the method is more in line with the production concept of green chemical industry.

The invention provides an isomerization catalyst as well as a preparation method and application thereof. The method comprises the following steps: kneading ZrO2-SO4 < 2->, phosphorus molybdenum tungsten heteropoly acid and pseudo-boehmite to obtain a mixture; kneading the mixture and the nitric acid aqueous solution to obtain clinker; carrying out extrusion molding, drying and roasting on the clinker to obtain a superacid carrier; putting the superacid carrier and the metal compound solution into a reaction kettle, pressurizing, relieving pressure, drying and roasting to obtain the isomerization catalyst, wherein the metal compound solution comprises a metal compound and water, and the metal compound comprises one or more of metal halide, metal sulfate, metal nitrate, metal acetate and metal oxalate. The high-pressure impregnation method is introduced to optimize the distribution of acidic sites of the superacid carrier, so that efficient, stable and environment-friendly preparation of the catalyst is realized.

The present invention relates to the technical field of catalysts, and relates to a superacid carrier and a preparation method therefor, and an isomerization catalyst and a preparation method therefor. On the basis of the total dry weight of the superacid carrier, the superacid carrier comprises the following components in percentage by weight: 45%-88% of a main component, 5%-20% of a first additive component, 1%-10% of a second additive component, 1%-10% of a third additive component, and 5%-15% of a fourth additive component. The main component is ZrO2-SO4 2-; the first additive component is AlPO4; the second additive component is SAPO-34 molecular sieve; the third additive component is phosphotungstomolybdic acid; and the fourth additive component is pseudoboehmite. The superacid carrier provided by the present invention has high stability, strong acidity, and large specific surface area, thereby improving the activity and selectivity of the catalyst, and increasing the yield of isomerization products.

The present invention provides a process for the coordinated treatment and resource utilization of industrial solid waste and CO2 in tail gas, belonging to the field of environmental protection technology. The present invention uses the residual carbon in the gasification slag as a catalyst, and realizes the gasification slag chemical method to extract aluminum and silicon under the action of the polyacid aqua regia effect and electrochemical action. The present invention adopts a heap retting neutralization method to convert the super acid and the aluminum and iron oxides in the ash into soluble salts, and sequentially replaces the iron hydroxide, aluminum hydroxide and polyacid ammonium from the salt solution through the ammonia replacement method, thereby overcoming the safety risks of the strong oxidizing property of the polyacid; utilizes the common ion effect to promote the rapid crystallization of the aluminum salt solution in the form of aluminum chloride; generates sodium silicate by the heap retting neutralization reaction of the slag and sodium hydroxide, and then introduces carbon dioxide to obtain silicic acid and sodium carbonate, and the sodium carbonate solution reacts with calcium hydroxide to obtain sodium hydroxide. Sodium hydroxide, polyacid, ammonia and activated carbon are recycled for the treatment of fly ash and coal gangue, realizing the comprehensive utilization of polyacid solid waste.

The application discloses a preparation of an activated carbon supported solid superacid catalyst and application of the catalyst in C-O bond hydrogenolysis of aryl ethers. 2‑ The metal ruthenium, ZrO2 and S2O8 2‑ are loaded on the carrier by an impregnation method to obtain a high-activity solid superacid Ru-SO / xZr-AC (x=5, 10, 15 or 20) catalyst; the metal ruthenium is uniformly distributed on the carrier, the average size of the metal particles in the Ru-SO / 10Zr-AC catalyst is significantly reduced to 1.68 nm compared with that in the Ru / AC; compared with other Ru-based catalysts, the Ru-SO / 10Zr-AC solid superacid catalyst has the highest activity in C-O bond hydrogenolysis of diphenyl ether and exhibits the highest catalytic performance, and can control the high-efficiency conversion of diphenyl ether into monocyclic products under the optimal reaction conditions (180 DEG C, 1 MPa H2, 2 h and n-hexane). The high-activity solid superacid Ru-SO / xZr-AC catalyst provided by the application can efficiently catalyze the C-O bond hydrogenolysis of diphenyl ether and other aryl ethers while inhibiting the hydrogenation of aromatic rings, greatly saves the cost, is safer and has a good application prospect.

The application discloses a method for synthesizing ethylene glycol diacetate by using a solid superacid catalyst. 2‑ The application discloses a method for synthesizing ethylene glycol diacetate by using a solid superacid catalyst of SO4 2‑ / TiO2-SiO2 type. The catalyst is prepared by co-precipitation of a titanium source and a silicon source, impregnation with dilute sulfuric acid and calcination, and has high specific surface area and rich strong acid sites. The catalyst can be used to catalyze esterification of ethylene glycol and acetic anhydride (or acetic acid) at 140-150 DEG C to efficiently generate ethylene glycol diacetate, the yield of which can be more than 90%, and the by-product is very little. The catalyst can be easily separated from the reaction system and has good recycling performance. The application has the advantages of high catalytic activity, good selectivity, no corrosion, recyclable catalyst and the like, and can be used for industrial production of ethylene glycol diacetate.

The present invention discloses a polycarbazolyl nitrogen-containing derivative, an anion exchange membrane, and a preparation method and application thereof, relating to the technical field of polymer compounds. The polycarbazolyl anion exchange membrane provided by the present invention is a matrix, showing high stability, and 3-methyl-3,6-diazolyl[5,5]-6-ammonium bromide has a diquaternary ammonium cation structure, which can be grafted onto the polycarbazolyl matrix to significantly improve the conductivity of the membrane. The present invention adopts a superacid-catalyzed polymerization method to prepare a high ion exchange capacity anion exchange membrane with a microphase separation structure. The prepared anion exchange membrane has the characteristics of high ion exchange capacity, good alkali resistance and stability, and the method is simple and easy to industrialize. This anion exchange membrane has important application value in industries related to the field of hydrogen energy, such as alkaline fuel cells, water electrolysis hydrogen production, liquid flow batteries, and electrochemical ammonia synthesis.