62 results about "Pyromellitic acid" patented technology

The invention relates to the technical field of OLED (Organic Light Emitting Diode) manufacturing process etching processes, in particular to a silver etching solution for an OLED manufacturing process as well as a preparation method and application of the silver etching solution. The silver etching liquid comprises nitric acid, phosphoric acid, a buffer agent, a metal ion chelating agent and an ionic liquid inhibitor, the ionic liquid inhibitor comprises 1-butyl-3-methylimidazole phosphate, the metal ion chelating agent is selected from at least one of pyromellitic acid, diethylenetriamine pentaacetic acid and ethylenediamine tetramethylene phosphoric acid, and the buffer agent is selected from at least one of sodium chloride, sodium chloride and sodium chloride. The buffering agent comprises acetic acid, and all the components are prepared according to a specific mass ratio. The etching solution can balance the etching rate of silver and indium tin oxide, avoid silver residues and black spot defects, prolong the service life of the solution, reduce the use of a volatile buffer agent, adapt to the OLED fine manufacturing process, improve the product yield and reduce the production cost, and is suitable for etching of a metal substrate in the OLED manufacturing process.

The invention relates to a fluoro-ligand regulated metal organic framework material and a preparation method and application thereof, the fluoro-ligand regulated metal organic framework material is prepared and synthesized by using zirconium oxychloride as a metal node and trimesic acid / 5-fluoroisophthalic acid as an organic ligand through a reflux method; the unit structural formula of the fluorinated ligand metal organic framework material is [Zr6O4 (OH) 4 (BTC) 2-x (F-BTC) x (AA) y (H2O) z], according to the preparation method, trimesic acid and part of 5-fluoroisophthalic acid are co-coordinated, a C-F bond is introduced to regulate and control the electronic environment around a Zr node through deletion of a connecting site, uniform nucleation of crystals is promoted, the grain size of the obtained material is remarkably reduced, and the dispersity is higher.

The invention discloses a preparation method and application of a dual-channel multifunctional multicolor fluorescent probe, and relates to the technical field of fluorescent sensing detection.The dual-channel multifunctional multicolor fluorescent probe is prepared through the following steps that pyromellitic acid and ZrCl4 solids are dispersed in deionized water, Zr-MOF is prepared through a hydrothermal method, pamoic acid and melamine are dispersed in deionized water, and the Zr-MOF is prepared through a hydrothermal method; the preparation method comprises the following steps: preparing green fluorescent carbon dots (CDs) by using a hydrothermal method, dispersing the CDs and Zr-MOF in deionized water according to a certain proportion, reacting, collecting a brown solid, washing, drying, dispersing the solid in ethanol, adjusting the pH to be alkaline, adding Eu (NO3) 3.6 H2O, reacting, filtering, and drying in vacuum to obtain a target probe. The probe can accurately distinguish Cu < 2 + > ions of tetracycline antibiotics (TCs) through two independent fluorescent channels, not only displays completely independent spectral response, but also has the advantages of self-calibration, high sensitivity, interference resistance, field visual detection and the like. The multifunctional fluorescent probe has important significance for improving detection efficiency, reducing cost and energy consumption, optimizing resource utilization and promoting green low-carbon economy.

The invention relates to the technical field of sodium ion batteries, and discloses a preparation method of a sodium battery additive and application of the sodium battery additive in a sodium battery, and the preparation method comprises the following steps: a) a reaction step: in an isopropanol solvent, enabling pyromellitic acid and sodium hydroxide to react under heating and stirring; after the reaction is finished, filtering a reaction product to obtain a benzene tetracarboxylic acid sodium crude product; b) a purification step: dissolving the benzene tetracarboxylic acid sodium crude product in water, and heating for rotary evaporation until the solution reaches a saturated state; adding methanol into the solution in the saturated state to separate out a solid, and filtering a mixture containing the solid while the mixture is hot; and carrying out vacuum drying on the solid obtained by filtering to obtain the sodium electric additive. According to the invention, the high-purity product is used as the sodium-ion battery additive, and the comprehensive performances of high-temperature circulation, high magnification, low temperature and the like of the battery can be comprehensively and obviously improved through a unique mechanism of synchronously forming a stable protective film on a positive electrode and a negative electrode.

The present application relates to a method for liquid phase oxidation of durene, which comprises: a first stage, in the presence of a catalyst, with acetic acid as a solvent, a liquid phase oxidation reaction of an oxidant source and durene to produce an intermediate mixture, the catalyst containing Co salt, Mn salt, Zr salt and bromide compound; a second stage, adding a mixture of bromide and pure water to the intermediate mixture, and continuing the oxidation reaction with the oxidant source to produce pyromellitic acid; wherein the concentration of oxidant in the oxidant source of the first stage is lower than the concentration of oxidant in the oxidant source of the second stage. By controlling the concentration of oxidant in the oxidant source of the first stage to be lower than the concentration of oxidant in the oxidant source of the second stage in the liquid phase oxidation process of durene, the yield of pyromellitic acid and the purity of crude pyromellitic acid are significantly improved.

The application provides a preparation method of high-purity pyromellitic dianhydride, which is prepared from 2,3-dichloromaleic anhydride as raw material, and sequentially subjected to Diels-Alder cycloaddition reaction, elimination reaction and oxidation reaction to obtain high-purity pyromellitic acid, and then subjected to dehydration treatment to obtain high-purity pyromellitic dianhydride. In the preparation method, pyromellitic acid is used as a dehydration raw material to prepare anhydride, so that intermediate acid by-products are not easy to be generated, and the product purity is improved; the dehydration reaction is promoted by adopting azeotropic distillation and separation coupling, so that the reaction yield is improved; the preparation steps are few, the reaction process is simple, the reaction condition is mild, the raw materials are economically inexpensive and easy to obtain; the catalyst or the aid used in each step does not generate harmful substances, and is green and environment-friendly.

The invention belongs to the technical field of energy materials, and discloses a preparation method of a zinc-based porous organic polymer coating and application of the zinc-based porous organic polymer coating to protection of a zinc negative electrode. Reaction raw materials of the zinc-based porous organic polymer provided by the invention are cheap soluble zinc salt and pyromellitic acid, and the zinc-based porous organic polymer is obtained through a one-step solvothermal reaction. Polyvinylidene fluoride (PVDF) is adopted as a binder, and Zn-POPs is loaded on the surface of the zinc negative electrode in the modes of spin coating, blade coating, spray coating and the like. According to the Zn-POPs protective coating provided by the invention, the concentration distribution of zinc ions on an interface can be dynamically regulated and controlled by an unsaturated coordinate bond, and a dendrite-free zinc negative electrode is realized. Meanwhile, the coating can isolate direct contact between the electrolyte and the negative electrode, so that corrosion of the zinc negative electrode and generation of byproducts are reduced; when the coating is applied to a symmetric battery and a total battery, the battery can show low polarization voltage and stable cycle performance, the advantages of the coating are further highlighted, and subsequent large-scale industrial production can be expected.

The present invention discloses a Ru-M@Al-MCM-41 catalyst and its preparation method and application. The present invention uses microspherical Al-MCM-41 as a carrier, confines the active component Ru and the auxiliary component M in the molecular sieve pores by strong electrostatic adsorption, and then reduces to obtain the Ru-M@Al-MCM-41 catalyst; the catalyst morphology is porous spherical. The Ru-M@Al-MCM-41 catalyst of the present invention has high activity and high stability and has good industrial application prospects. The catalyst of the present invention is used to catalyze the hydrogenation of pyromellitic acid esters to prepare hydrogenated pyromellitic acid esters, and the conversion rate of the substrate pyromellitic acid ester is high, and the selectivity of the target product hydrogenated pyromellitic acid ester is high.

This invention provides a carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst, its preparation method, and its application, belonging to the field of photocatalytic materials technology. First, a carbon nitride precursor and a carboxylating agent are mixed in a solvent to undergo a carboxylation reaction, yielding carboxylated graphitic carbon nitride. Then, the carboxylated graphitic carbon nitride is mixed with a copper salt solution for a preliminary reaction, yielding copper-supported C3N4-C powder. Finally, the copper-supported C3N4-C powder and 1,3,5-pyromellitic acid are dispersed in a solvent for a hydrothermal reaction to obtain the carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst. This invention, through directional assembly and growth, ultimately obtains a composite photocatalyst with tight interfacial bonding, stable structure, and high photogenerated charge separation efficiency.

The invention relates to the technical field of adsorption materials, in particular to a preparation method and application of a zirconium-based metal organic framework composite sodium alginate material, zirconium ions serve as a metal core, two ligands including pyromellitic acid and 2, 5-dihydroxy terephthalic acid are added, double-ligand MOFsUiO-66-(OH) 2 / (COOH) 2 is synthesized, then the double-ligand MOFsUiO-66-(OH) 2 / (COOH) 2 is compounded with sodium alginate (SA), and the zirconium-based metal organic framework composite sodium alginate material is obtained. The porous composite material SA (at) UiO-66-(OH) 2 / (COOH) 2 is obtained. The UiO-66-(OH) 2 / (COOH) 2 and SA are rich in-OH and-COOH, so that the chelating ability of the UiO-66-(OH) 2 / (COOH) 2 and SA on heavy metals is further enhanced, and the adsorption effect of the composite material on Pb < 2 + > is enhanced. The low-price composite material provides reference and thought for adsorption of metal ions in an actual water sample on site.

The purpose of this invention is to synthesize a carbon dot-based nanozyme and its cascade detection application. Using ascorbic acid and 1,3,5-pyromellitic acid as raw materials, ethylenediamine as a nitrogen dopant, and ferric chloride as a metal source, a one-step microwave synthesis method is employed in a microwave reactor (glass material). This method solves the problem of high energy consumption caused by the need for high temperature, high pressure, or long reaction time in existing technologies. Characterization and analysis of its morphology, structure, and properties revealed that the prepared iron-nitrogen co-doped carbon dot-based nanozyme consists of two-dimensional spherical carbon nanoparticles with excellent Fe-N... x The active site exhibits POD-like enzyme activity, with catalytic activity exceeding that of most reported nanozymes. Furthermore, this invention synergistically utilizes its peroxidase-like catalytic activity and photodynamic effect to significantly enhance reactive oxygen species (ROS) generation, achieving highly sensitive detection of organophosphorus pesticides and significantly reducing their detection limits. This synergistic strategy provides a new approach for expanding the application of nanomaterials in chemical analysis and sensing.

The invention provides a preparation method of pyromellitic acid based on a modified catalyst, and belongs to the technical field of pyromellitic acid materials, and the preparation method comprises the following steps: adding a pore-forming agent, an aluminum salt and a template in the process of preparing titanium dioxide by a sol-gel method, carrying out hydrolysis to obtain gel, standing, aging, drying and calcining to form particles; and dipping in a vanadium-tungsten mixed solution to form a precursor solution, loading the precursor solution on an inert carrier, and roasting to obtain the modified catalyst. Filling a gas phase oxidation reaction fixed bed with the modified catalyst, introducing a durene and air mixture, and carrying out catalytic oxidation, hydrolysis, filtration, crystallization, separation and drying to obtain the pyromellitic acid. The prepared catalyst is high in catalytic activity and good in thermal stability and is used for preparing pyromellitic acid, and the obtained product is high in yield and good in purity.

The present application relates to the technical fields of organic chemical synthesis, and discloses a method for synthesizing pyromellitic acid. The method comprises the following steps: (1) under gas-liquid reaction conditions, contacting liquid-phase materials containing durene, a solvent and a catalyst with an oxygen-containing gas in a micro-channel reactor to perform first oxidation, so as to obtain first oxidation materials, wherein the conditions of the first oxidation are such that the conversion rate of the durene reaches more than 99%, and the total molar amount of a monocarboxyl product, a dicarboxyl product and an intermediate product of the oxidation of the monocarboxyl product to the dicarboxyl product in the first oxidation materials is more than 85% of the molar amount of the first oxidation materials; and (2) sending the first oxidation materials into a reaction kettle to perform second oxidation. The method for synthesizing pyromellitic acid provided by the present application has the advantages of high yield, good selectivity, low possibility of blockage of the micro-channel reactor, high oxidation efficiency, safe reaction, economy and environmental protection.

This invention discloses a method for preparing a Zr-MOF-NH2 defluorinating agent and its application in the treatment of fluoride-containing wastewater, specifically relating to the field of deep defluorination technology. The method involves preparing a precursor solution by adding 1,3,5-pyromellitic acid, 5-aminoisophthalic acid, and concentrated hydrochloric acid to a mixed solution of acetic acid and water. ZrOCl2·8H2O is then added and the mixture is heated under reflux. After centrifugation, washing with organic solvents, and vacuum drying, a zirconium-based metal-organic framework defluorinating agent with –NH2 functional groups is obtained. This defluorinating agent exhibits strong affinity and high adsorption capacity for fluoride ions, demonstrates good defluorination performance over a wide pH range, and can reduce the fluoride ion concentration in actual fluoride-containing wastewater to a low level. It also boasts advantages such as simple process, mild conditions, good continuous operation performance, and suitability for engineering applications.

The invention relates to a carbon nanotube loaded tantalum monatomic doped bismuth sulfide catalyst as well as a preparation method and application thereof, and aims to solve the problems that the yield of H2O2 prepared through electro-catalysis of an existing bismuth-based catalyst is relatively low, and the selectivity of H2O2 is relatively low. The preparation method comprises the following steps: 1, dispersing trimesic acid, tantalum pentachloride and bismuth nitrate pentahydrate in methanol, and carrying out solvothermal reaction at 110-140 DEG C to obtain a tantalum-doped bismuth metal organic framework material; 2, grinding and mixing the tantalum-doped bismuth metal organic framework material and dibenzyl disulfide to obtain a mixture; and 3, in an argon atmosphere, heating to 750-950 DEG C, and carrying out heat preservation carbonization treatment. The bismuth sulfide catalyst prepared by the method shows H2O2 selectivity of more than 90% in a wide voltage range of 0-0.65 V, and the H2O2 yield can reach 8.76 mol.g <-1 >. H <-1 > under the industrial-grade current density of 75 mA / cm < 2 >.

The present application relates to the technical field of high polymer materials, and particularly relates to a preparation method of wear-resistant / low-dielectric PTFE composite material based on interface functionalization. Ammonia / hydrogen mixed gas is used to perform low-temperature plasma treatment on PTFE powder; then the activated PTFE powder is dispersed in an aqueous solution containing ammonium perfluorooctanoate and 4-dimethylamino pyridine; then an organic phase of pyromellitic acid dichloride and an aqueous phase of 4,4'-diamino diphenyl ether are synchronously added dropwise to implement in-situ interface polymerization on the surface of PTFE particles to generate a polyamide acid ammonium salt coating layer; finally, through programmed temperature rising, the coating layer is converted into polyimide, and under the action of hot pressing, a composite material with PTFE as a matrix and a three-dimensional network of polyimide nanofibers penetrating through the inside is formed. The interface bonding force between the reinforcing phase and the PTFE matrix is significantly enhanced, so that the composite material simultaneously has excellent wear resistance, low dielectric constant, high mechanical strength and thermal stability.

The application discloses a europium functionalized metal-organic framework double-emission fluorescent probe and a preparation method and application thereof, relates to the field of organic metal frameworks and fluorescent detection, and the preparation method comprises the following steps: mixing ZrCl4, pyromellitic acid, 6-hydroxy-2-naphthoic acid and water, adding acetic acid to obtain a mixture; the mixture is heated to reflux, centrifuged to obtain a residue, washed and dried to obtain UCHNA; the UCHNA is dispersed in an aqueous solution of Eu(NO3)3.6H2O, heated to react, the white precipitate is collected, washed and dried, and the Eu-MOF is obtained. 3+ The application has the beneficial effect that a luminescent ligand 6-hydroxy-2-naphthoic acid is used to modify a UiO-66 type MOF, and Eu 3+ -MOF is synthesized through post-modification and reasonable design, and the Eu-MOF can selectively and rapidly respond to crystal violet (CV) and quinine (QN) through different response modes, and has a low detection limit, which is superior to most reported sensors.

The invention belongs to the technical field of metal surface treatment, and discloses a formation agent and a preparation method and application thereof. The formation agent comprises phosphoric acid, nitric acid, zinc dihydrogen phosphate, nickel salt, manganese salt, zinc salt, composite organic acid and a solvent, the composite organic acid comprises citric acid, tartaric acid and pyromellitic acid; the zinc salt does not comprise zinc dihydrogen phosphate. The formation agent is a low-temperature formation agent, a compact protective film layer can be formed on the metal surface under the low-temperature condition such as 15-35 DEG C, and the protective film layer has good corrosion resistance. When the paint film coating is subjected to electrophoresis on the surface of the protective film layer, the protective film layer and the paint film coating have good bonding strength.

The present invention relates to a preparation method of an acrylic copolymer composite ZrMOF aerogel fertilizer slow-release material, which comprises the following steps: (1) dissolving a zirconium salt and pyromellitic acid in a mixed solvent at room temperature, subsequently adding concentrated HCl, and reacting after ultrasonic dissolution; after the reaction product is cooled to room temperature, centrifugation, washing, and drying overnight to obtain a mesoporous ZrMOF powder; (2) uniformly mixing the mesoporous ZrMOF powder with nitrogen fertilizer and distilled water to obtain a ZrMOF / nitrogen fertilizer mixed solution; (3) adding the ZrMOF / nitrogen fertilizer mixed solution and a polysaccharide natural polymer to a container in sequence and stirring at room temperature; simultaneously adding a water-soluble initiator, an acrylic acid monomer mixed solution, and a cross-linking agent aqueous solution from different bottle openings; after stirring the reaction, the product is washed and freeze-dried to obtain an acrylic copolymer composite ZrMOF aerogel fertilizer slow-release material. The present invention has a simple process, readily available raw materials, low cost, mild preparation conditions, and the obtained material is eco-friendly, safe, and reliable, and can be applied to the agricultural field, especially in arid and semi-arid areas.

The application provides a method for producing pyromellitic anhydride by a pyromellitic acid dehydration process and belongs to the technical field of organic compound synthesis. The method comprises the following steps: (1) dissolving pyromellitic acid in an organic solvent and heating and dehydrating; and (2) cooling and crystallizing and separating to obtain pyromellitic dianhydride. The organic solvent comprises diphenyl ether and hydrogenated terphenyl. The mixture of diphenyl ether and hydrogenated terphenyl is used in the application, the low-temperature operation window is expanded, and better PMDA yield and PMDA purity are obtained compared with the case of using diphenyl ether or hydrogenated terphenyl as the solvent, and the problems of easy formation of a viscous system, narrow temperature operation window and inconvenient operation during low-temperature crystallization in the prior art are solved.

The invention discloses a method for purifying pyromellitic dianhydride, comprising: mixing a mixed gas containing pyromellitic dianhydride and an inert gas, and then passing the mixed gas through a membrane contactor into an aqueous solution for hydrolysis reaction, followed by solid-liquid separation to obtain a pre-crystallization liquid; subjecting the pre-crystallization liquid to ultrasonic treatment, cooling crystallization, and solid-liquid separation to obtain pyromellitic acid crystals; and dehydrating the pyromellitic acid crystals to obtain once-purified pyromellitic dianhydride. The method improves the mass and heat transfer efficiency and the hydrolysis rate of pyromellitic dianhydride by passing the mixed gas through a membrane contactor for bubbling. In addition, by controlling the turbidity of the pre-crystallization liquid after ultrasonic treatment, the crystallization efficiency and crystal purity of pyromellitic acid are improved, and a small and uniform crystal product is obtained, thereby preventing the crystals from adhering to the kettle wall and being difficult to collect, and also preventing the entrainment of impurities, and further improving the dehydration efficiency. The obtained pyromellitic dianhydride has a high purity and yield.

The utility model discloses a crystallization equipment for production of pyromellitic acid belongs to pyromellitic acid production technical field, and its technical scheme main points include equipment body, the top of equipment body is provided with the cover, the inner wall rotationally connected of cover has the stirring shaft, the surface of stirring shaft has the first limit component and is connected with, the inner wall of first limit component is provided with stirring mechanism, the surface of stirring shaft has the second limit component and is connected with, solved the crystallization equipment for production of pyromellitic acid of current pyromellitic acid production when using, the stirring part of crystallization equipment adopts integrated or fixed connection mode more, after long -term operation, the stirring part is easy to wear because of material friction, corrosion, the stirring part after wearing is difficult to disassemble and replace fast, is easy to cause stirring efficiency reduction, causes the uneven crystallization of subsequent pyromellitic acid, influences product quality, and needs long -term shutdown when replacing the part, reduces the production efficiency problem.

A working fluid comprising a lubricant and a refrigerant, the lubricant comprising a tetra-alkyl ester of pyromellitic acid, wherein each of the four alkyl groups of the tetra-alkyl ester of pyromellitic acid contains 1 to 4 carbon atoms.

The invention relates to the technical field of functional materials, and discloses a preparation method of metal-organic framework loaded unoxidized bare copper nano-particles and application of the metal-organic framework loaded unoxidized bare copper nano-particles to removal of active oxygen. The preparation method comprises the following steps: adding copper acetate, pyromellitic acid and tetrazole into a mixed solvent according to a preset molar ratio; transferring the mixture into a reaction container after fully stirring and premixing, putting the reaction container into an oil bath pan for stirring reaction, cooling to room temperature after the reaction is finished, and centrifugally washing for three times to obtain light blue powder; the light blue powder is soaked in a phosphate buffer solution, centrifugal washing is conducted three times after soaking is finished, and nanosheets are obtained through drying; and loading the nanosheet on a crystal face to serve as a working electrode, carrying out electrolytic reaction under a preset working potential condition to obtain an electrolytic reaction product, and scraping off the electrolytic reaction product and washing to remove the adhesive to obtain the metal-organic framework loaded unoxidized bare copper nanoparticles. The nanoparticles prepared by the invention have broad-spectrum scavenging activity and excellent durability.

The invention provides a lithium benzenetetracarboxylic acid-coated high-nickel positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of preparation of positive electrode materials of lithium ion batteries. The high-nickel positive electrode material is obtained by mixing a high-nickel ternary precursor with lithium hydroxide and sintering the mixture in stages in a pure oxygen atmosphere; the preparation method comprises the following steps: adding the high-nickel positive electrode material into a mixed solution of pyromellitic acid and ethylene glycol, stirring for reaction, cooling, filtering, washing with absolute ethyl alcohol, and carrying out vacuum drying to successfully convert residual lithium on the surface into a lithium benzenetetracarboxylic acid coating layer in situ, thereby obtaining the lithium benzenetetracarboxylic acid coated high-nickel positive electrode material. According to the method, residual lithium of the high-nickel positive electrode material can be effectively removed, the formed lithium benzenetetracarboxylic acid coating layer has good ionic conductivity, side reaction of the material and electrolyte can be effectively isolated, and the interface stability is improved; meanwhile, transmission of lithium ions at an interface can be accelerated, polarization is reduced, and therefore the charging and discharging performance of the material is improved.

The utility model relates to the technical field of water scrubbers, in particular to a multi-washing water scrubber which comprises a scrubber body and a washing mechanism, an exhaust port is formed in the top end of the tower body, an air inlet pipe is arranged at the bottom end, a check valve is arranged on the air inlet pipe, and a sealing door body is arranged at the side end of the tower body; the water washing mechanism is arranged in the tower body, the water washing mechanism is composed of the driving assembly and the spraying assembly, the spraying assembly can be driven by the driving assembly to conduct multiple water washing on tail gas generated during pyromellitic acid production, the cleanliness of the tail gas is improved, and pollutant emission is avoided. Through the arrangement of the filtering mechanism, the surface area of tail gas reaction during production of pyromellitic acid is increased, so that the reaction rate is increased, and the decontamination efficiency is enhanced; the spraying assembly is driven to rotate through the driving assembly, multiple washing can be conducted on tail gas generated during pyromellitic acid production, the filtering efficiency is further improved, and tail gas emission pollution is reduced.

The invention particularly relates to a method for efficiently filtering and purifying pyromellitic acid from a liquid dispersion. The method comprises the following steps: concentrating pyromellitic acid mother liquor obtained after hydrolysis under reduced pressure to form an approximately saturated solution; then slowly cooling, standing and floating to remove floating impurities on the upper layer, and then filtering; extracting the filtered mother liquor; cooling the extracted mother liquor, adding PMA microcrystals and betaine, standing, preserving heat and growing crystals; the obtained crystals are efficiently filtered, washed and subjected to vacuum drying, and purified pyromellitic acid crystals are obtained. According to the method, all links are synergistic, impurities in the PMA mother liquor are efficiently removed, pyromellitic acid crystals large in particle size and high in stacking density are obtained through crystallization engineering, and the filtering efficiency, the product purity and the yield of pyromellitic acid are remarkably improved.

The utility model discloses an absorption device for pyromellitic acid production, which belongs to the technical field of pyromellitic acid production, and is characterized by comprising an absorption box, the rear side of the absorption box is fixedly connected with a storage box, the top of the storage box is provided with a pump body, the top of the absorption box is provided with a spraying mechanism, and the spraying mechanism is connected with the pump body. An air inlet mechanism is arranged in the absorption box, and a box cover is arranged at the top of the absorption box; the air inlet mechanism comprises a dispersion box, a plurality of dispersion holes and an air inlet pipe, and solves the problems that the existing part of structures for absorbing pyromellitic dianhydride generated during production of pyromellitic acid need to use various filter elements with special adsorption performance to realize efficient absorption, and the filter elements need to have broad-spectrum adsorbability, so that the production efficiency of pyromellitic dianhydride is influenced. The problems that in the prior art, an existing filter element is generally high in price, consumption of the filter element is large, cost is high, and the inner wall of an absorption structure is inconvenient to clean in the prior art are solved.

A resin composition for sealing an electronic device according to embodiments of the present invention comprises an epoxy-based compound, an inorganic filler, ascorbic acid or a derivative thereof, and a catalyst including bis(tetraalkylphosphonium) pyromellitic acid-based compound.

The invention provides an MOF-based single ion conductor solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolytes. The preparation method provided by the invention comprises the following steps: 1) carrying out heating reaction on ZrCl4 or ZrOCl2 and pyromellitic acid in a weakly acidic aqueous solution, and collecting a precipitation product after the reaction is completed; (2) soaking the precipitation product with a first organic solvent, washing, and drying, so as to obtain Zr-UiO-66-2COOH powder; and (3) carrying out oil bath heating reaction on the Zr-UiO-66-2COOH powder, LiOH and a second organic solvent in protective gas, and filtering after the reaction is completed, so as to obtain the Zr-UiO-66-2COOLi powder. Compared with other solid-state electrolytes, the single-ion conductor solid-state electrolyte provided by the invention has the core advantages that no lithium salt is added, only migration of working ions (Li) is allowed, and the concentration polarization phenomenon can be effectively inhibited, so that the cycling stability of the battery is improved. In addition, the dendritic crystal growth problem can be relieved through uniform ion flow distribution, and the safety is further improved.