112 results about "O-Xylene" patented technology

The invention discloses an o-methylbenzyl chloride production process which comprises the following steps: S1, a chlorination section: pumping o-xylene into an evaporation kettle, heating, vaporizing the o-xylene in the kettle, enabling the vaporized o-xylene to enter a chlorination tower, introducing chlorine gas into the chlorination tower, and carrying out a chlorination reaction on the chlorine gas and rising o-xylene gas under the catalysis of visible light, the generated o-methylbenzyl chloride and o-dichlorobenzyl are in a liquid state and flow back into the evaporation kettle, the material crude benzyl in the kettle is transferred into a rectifying kettle, and hydrogen chloride gas generated by the reaction enters a hydrogen chloride absorption section. The supporting table, the feeding conveying belt, the discharging conveying belt and the rotatable transfer plate in the product tank conveying mechanism are matched with one another to form an efficient conveying system, after being placed on the feeding conveying belt, a finished product tank to be filled can be rapidly conveyed to the positions of the supporting table and the transfer plate, and through rotation of the transfer plate, the finished product tank to be filled can be rapidly conveyed to the supporting table and the transfer plate. And the finished product tanks can be accurately transferred to all stations, so that the conveying efficiency is greatly improved, and the manual carrying time and labor intensity are reduced.

Provided are a phenolic resin having a specific structure that is used to obtain an epoxy resin having excellent handlingability at low viscosity, the epoxy resin capable of forming a cured product having low water absorption properties and high bending properties (bending strength, bending elastic modulus, bending strain, etc.), a curable resin composition containing the epoxy resin, a cured product obtained from the curable resin composition, a fiber-reinforced composite material, and a fiber-reinforced resin molded article. The phenolic resin is a reaction product of a catechol compound, a phenol compound, and an o-xylylene skeleton-containing compound, and has a catechol skeleton derived from the catechol compound, a phenol skeleton derived from the phenol compound, and an o-xylylene skeleton derived from the o-xylylene skeleton-containing compound.

The invention discloses a lactobacillus brevis SMF L6 strain for improving the characteristic flavor of fermented fish and application thereof, and belongs to the technical field of aquatic product processing. According to the method disclosed by the invention, low-temperature fermentation is carried out by utilizing a sake lactobacillus wide cloth SMF L6 direct vat set fermentation inoculant to regulate and control the flavor; the method can effectively promote the production of flavor substances such as n-hexyl alcohol, eudesmol, 2-ethylhexyl alcohol, 4-platycladi alcohol, linalool, 4-terpene alcohol, alpha-terpilenol, piperonone, beta-myrcene, alpha-terpinene, D-limonene, beta-phellandrene, gamma-terpinene and the like in the fermented fish. The content of pungent smell and fishy smell substances such as acetic acid, p-xylene, o-xylene, trimethylamine, methyl mercaptan and carbon disulfide is reduced.

The utility model discloses a phthalic anhydride preparation device with a preheater, which comprises an o-xylene storage tank, an o-xylene heater, a mixer, an oxidation reactor, a first phthalic anhydride catcher, a second phthalic anhydride catcher, a tail gas tower and a phthalic anhydride rectifying tower which are sequentially connected through a pipeline, a liquid adding pump is arranged between the o-xylene storage tank and the o-xylene heater; the phthalic anhydride preparation device with the preheater further comprises an air compressor and an air heater which are sequentially connected through a pipeline, the air heater is connected with the mixer through a pipeline, and the air preheater is further arranged between the air compressor and the air heater and comprises a body. A heating pipe fitting is arranged in the body, the heating pipe fitting comprises a heating pipe and spiral fins arranged around the heating pipe, by-product low-pressure steam of the oxidation reactor can be reasonably utilized by additionally arranging the air preheater, and the use amount of high-pressure steam is saved.

The invention relates to an isoindole thioimine compound, preparation thereof and application of the isoindole thioimine compound as a sigma-2 receptor inhibitor. Catechol and isobutene are subjected to a series of reactions under certain conditions to obtain a solid product; carrying out a series of reactions on o-xylene and chlorosulfonic acid under certain conditions to obtain an oily product; and reacting the solid product with the oily product under a certain condition to obtain the isoindole thioimine compound. Compared with the prior art, when the isoindole thioimine compound prepared by the invention is combined with a sigma-2 receptor and allosteric regulates a sigma-2 receptor compound, the combination of adjacent A beta oligomers and a receptor on synapse is unstable, so that the A beta oligomers are removed from the synapse, the activity of the sigma-2 receptor can be effectively inhibited, and the activity of the sigma-2 receptor can be inhibited. The compound can be further used for preparing new medicines for treating tumors and neurodegenerative diseases.

The application discloses a synthesis method of 2,3,3',4'-biphenyl tetracarboxylic dianhydride, characterized in that 2,3-dimethylaniline is used as a starting raw material, 2,3-dimethylaniline diazonium salt is prepared through a diazotization reaction, then 2,3,3',4'-tetramethyl biphenyl is prepared through a coupling reaction of the 2,3-dimethylaniline diazonium salt and o-xylene under the catalysis of cuprous chloride, and finally 2,3,3',4'-biphenyl tetracarboxylic dianhydride is prepared through an oxidation reaction and dehydration to form anhydride. The coupling reaction in the synthesis method has good selectivity, 3,3,4',4'-tetramethyl biphenyl which is difficult to separate is not generated, high-purity a-BPDA can be finally obtained, and the coupling reaction in the synthesis method only needs to use low-cost cuprous chloride as a catalyst, so that the production cost is greatly reduced compared to a high-cost catalytic system in the prior art, and the synthesis method is more suitable for industrial mass production.

The application provides a catalyst and a preparation method and application thereof, and the catalyst comprises a carrier and an active metal component loaded thereon; the carrier comprises ZSM-5 zeolite and a binder, and the molar ratio of SiO2 / Al2O3 in the ZSM-5 zeolite is 15-50; the amount of strong acid centers on the outer surface of the catalyst is less than or equal to 10 mu mol / g; and the ratio of the saturated adsorption amount of p-xylene to the saturated adsorption amount of o-xylene of the catalyst is 3-20 under the condition of 400 DEG C. The catalyst provided by the application can catalyze the generation of benzene from toluene dealkylation under a medium-temperature condition, and the selectivity of benzene is good and the yield is high.

The invention relates to the technical field of phthalic anhydride, and discloses a method for preparing phthalic anhydride, an ex-situ activation method and application. The method comprises the following steps: activating a catalyst in an oxygen-containing atmosphere under the condition that the pressure is greater than or equal to 0.2 bar, and then contacting feed gas containing o-xylene and / or naphthalene and air with the activated catalyst. By adopting the method provided by the invention to activate the catalyst, o-xylene and / or naphthalene in the feed gas can be rapidly increased to the highest concentration from the initial concentration, the load extraction period of the catalyst is obviously reduced by about 30-40 days, the operation cost of enterprises is reduced, and the cost of manufacturers is saved.

The invention discloses a microwave crystallization preparation method of a transition metal nitride ultrathin nanosheet, which comprises the following steps: (1) dissolving a transition metal salt and Li3N in an o-xylene solution, then adding an ethylenediamine solution, fully stirring, heating the solution, and carrying out microwave crystallization to obtain a precursor solution; and carrying out centrifugal collection, washing and vacuum drying to obtain the amorphous transition metal nitride nanosheet. The transition metal salt is WCl < 6 >, VCl < 3 > or MoCl < 5 >; and (2) in a nitrogen atmosphere, the amorphous transition metal nitride nanosheet is subjected to rapid microwave heating, and the highly crystallized transition metal nitride nanosheet is obtained. The preparation process of the TMN nanosheet with the surface-enhanced Raman effect, provided by the invention, has very strong controllability, the thickness of the prepared nanosheet is about 1-2nm, the phenomenon of sintering or aggregation is avoided, and the TMN nanosheet with the surface-enhanced Raman effect has an outstanding surface-enhanced Raman spectrum effect.

The invention discloses a covalent organic framework material for directly capturing carbon dioxide in air and coupling solar photo-thermal rapid desorption and a preparation method of the covalent organic framework material, and belongs to the field of materials. According to the material, piperazine with secondary amine sites and dialdehyde derivatives are used as raw materials, dioxane and mesitylene, m-xylene and mesitylene or o-xylene and mesitylene are used as solvents, and solvothermal reaction is performed; and after the reaction is finished, sequentially carrying out suction filtration and washing by using DMF and THF, carrying out Soxhlet extraction for 24 hours, and then carrying out vacuum drying to obtain the covalent organic framework. The aldehyde and the secondary amine are condensed according to the proportion of 1: 2, and the secondary amine site of the raw material piperazine is converted into the tertiary amine site in the covalent organic framework through aminal reaction. Tertiary amine nitrogen atoms can specifically recognize carbon dioxide in air and perform chemical adsorption, and firm covalent bonds can ensure the stability of a covalent organic framework, so that efficient air carbon dioxide capture is realized. In addition, ionic bonds formed by the covalent organic framework and carbon dioxide are also beneficial to coupling solar photo-thermal low-energy-consumption desorption.

The invention discloses a preparation method of high-molecular-weight polyvinyl ether, and relates to the technical field of organic synthesis. Comprising the following steps: 1, adding vinyl ethyl ether into o-xylene, and adding alcohol and a catalyst to initiate polymerization; and 2, carrying out low-temperature polymerization, after the reaction is finished, adding deionized water, carrying out liquid separation and distillation, and adding o-xylene to adjust the solid content so as to form a solution, thereby obtaining the high-molecular-weight polyvinyl ether. Vinyl ethyl ether is dissolved in o-xylene, a catalyst is added at the temperature of 30-40 DEG C to initiate a polymerization reaction, polymerization continues at the temperature of-10-10 DEG C, and light yellow transparent viscous liquid, namely the high-molecular-weight polyvinyl ethyl ether, is obtained. The method is carried out in the solvent, the solvent does not need to be removed and recycled, the reaction route operation is simple, and the polymer molecular weight is controllable. The method has the advantages of no by-product and high yield.

The invention provides an organic solar cell device prepared through electric field assisted solution shear coating and a preparation method, and belongs to the technical field of organic photovoltaic device preparation. An organic solar active layer based on a non-fullerene receptor is selected, and a halogen-free solvent o-xylene is adopted; in the active layer film deposition process, an external pulse polarization electric field is applied to control molecular arrangement and microcrystal morphology, so that the photoelectric conversion efficiency of an organic photovoltaic device without extra thermal annealing is improved. The preparation process of the organic solar cell is simplified, the method has wide commercial application prospects, and a detailed solution is provided for commercialization of the organic solar cell.

This invention discloses an ultra-low friction lubricating material system with self-catalytic effect and its preparation method, belonging to the field of lubricant technology. The ultra-low friction lubricating material system is composed of a base oil, an organometallic catalyst, and organic additives. The organometallic catalyst is at least one selected from ferrocene, cobalt carbonate, cobalt oxalate, copper acetate, and nickel oxalate. The organic additives are at least one selected from o-xylene, ethylene glycol, dodecanol, oleic acid, and tetraethyl orthosilicate. During friction, the organometallic catalyst releases metal ions, which, under the action of frictional heat and contact pressure, catalyze the base oil components to form a carbonaceous lubricating film in situ on the surface of the friction pair. The organic additives provide an additional carbon source during friction, working together with the organometallic catalyst to reduce the break-in time for the friction pair to reach a stable state. This lubricating material system not only significantly reduces the coefficient of friction and wear rate but also significantly shortens the break-in time.

The application discloses a network soil thermal desorption catalyst, a preparation method and application thereof, and belongs to the field of environmental protection. The catalyst takes an iron net as a carrier and takes manganese-cobalt composite metal sulfide as an active component. The mass content of the active component is 3-6% based on the mass of the carrier. The scheme is characterized in that the iron net is subjected to oxidation pretreatment, so that an iron trioxide oxidation layer is formed on the surface; then the iron net is immersed in an active component solution to perform electrochemical deposition loading; finally, the finished catalyst is formed through special atmosphere calcination. The catalyst is environment-friendly, can efficiently induce the thermal desorption of organic pollutants in soil, and can realize 100% removal of o-xylene at 120 DEG C. Meanwhile, the catalyst is convenient to recycle, has higher economic benefits and wide market application prospect.

The application discloses a synthesis method of o-phthalaldehyde. O-xylene, a halogenated reagent and an organic solvent are mixed, and under ultraviolet light irradiation, a bromination product with different bromination degrees is generated by reaction; water is added into the reaction liquid, and the reaction is continuously carried out; after the reaction is completed, the organic solvent and water are removed by evaporation, and a crude ɑ, ɑ, ɑ', ɑ'-tetra-brominated o-xylene product is obtained; the crude product is recrystallized to obtain ɑ, ɑ, ɑ', ɑ'-tetra-brominated o-xylene product; and the ɑ, ɑ, ɑ', ɑ'-tetra-brominated o-xylene is hydrolyzed to obtain o-phthalaldehyde. The synthesis method optimizes the bromination and hydrolysis process, and by adding appropriate water in the o-xylene bromination process, the yield of the final product o-phthalaldehyde is improved.

The invention relates to the technical field of aniline substance synthesis, in particular to a preparation method of 3, 4-dimethyl-2, 6-dinitro-N-(2-amyl) aniline, which comprises the following steps: step 1, adding 2-pentanone, alkylol amine and a catalyst into a reaction kettle, fully mixing, introducing hydrogen, controlling the reaction temperature to be 70-90 DEG C and the reaction pressure to be 0.80-2.5 MPa, reacting for 2-4 hours, separating and purifying to obtain 2, 4-dimethyl-2, 6-dinitro-N-(2-amyl) aniline; the 2-aminopentane is obtained; and 2, adding o-xylene and Lewis acid into the batching kettle according to a ratio, uniformly stirring, pumping into the mixing reaction chamber of the microchannel reactor, continuously introducing chlorine into the microchannel reactor, and carrying out a reaction: the preparation method of 3, 4-dimethyl-2, 6-dinitro-N-(2-amyl) aniline provided by the invention is simple, and has the advantages of high yield, high yield and high yield. The preparation raw materials are simple and easy to obtain, few pollutants are generated in the preparation process, the reaction yield is high, the reaction conditions are mild, and the method is suitable for popularization and application.

The application discloses a kind of fast screening method of solvent residual quantity in food contact packaging material, sample is sent into gas chromatograph by headspace sampler and separates out the gas to be measured, and the gas to be measured is detected using hydrogen flame ion detector, and the chromatogram of sample is obtained;Add mixed standard intermediate liquid of known content in blank matrix to obtain the standard reference sample of the limited concentration to be measured, and the peak area of methyl acetate, benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene is measured respectively;By comparing the sum of the peak area of all detected substances in sample chromatogram with the chromatographic peak area of methyl acetate in standard reference sample, judge whether the total amount of residual solvent meets the limit requirement, and by comparing the peak area of benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene in sample with the peak area of corresponding substance in standard reference sample, judge whether each benzene solvent meets the limit requirement.

The invention provides an organic photovoltaic device active layer of a non-halogenated solvent as well as a preparation method and application of the organic photovoltaic device active layer. The preparation method of the active layer of the organic photovoltaic device comprises the following steps: dissolving a first raw material system comprising a donor material, a first acceptor material and a liquid additive in an o-xylene solvent, and stirring to obtain a first mixed solution; or dissolving a second raw material system comprising the donor material, the first acceptor material, the second acceptor material and the solid additive in the o-xylene solvent, and stirring to obtain a second mixed solution; and spin-coating the first mixed solution or the second mixed solution on a substrate, and annealing to form the active layer of the organic photovoltaic device. The active layer of the organic photovoltaic device prepared by the preparation method does not contain a halogenated solvent, the threat of the toxicity and volatility of the halogenated solvent to the health of operators is avoided, and the pollution to the environment is reduced, so that the preparation method has the advantages of high safety and high environmental friendliness.

The invention discloses a method for preparing 9, 9-bis (3, 4-dicarboxyphenyl) fluorene dianhydride, which specifically comprises the following steps: S1, adding 9-fluorenone and o-xylene into a reaction kettle; S2, adding sulfuric acid and stirring; s3, cleaning is conducted; s4, preparing an intermediate 1; s5, stirring the raw materials until the raw materials are dissolved and clarified, cooling to room temperature without solid precipitation, and transferring to a continuous flow section; s6, carrying out continuous flow reaction treatment; and S7, adding acetic anhydride, filtering, and drying to obtain the 9, 9-bis (3, 4-dicarboxyphenyl) fluorene dianhydride. The invention relates to the technical field of catalyst preparation. According to the method for preparing 9, 9-bis (3, 4-dicarboxyphenyl) fluorene dianhydride, a continuous flow SK mixer is adopted to more fully realize gas-liquid mixing, so that the reaction rate is increased, the area of a continuous flow reaction unit is small, the risk in the industrialization process is reduced, continuous production is realized, and the problems of high safety risk, low productivity and the like of an intermittent reaction kettle are solved.

The invention belongs to the field of organic chemical industry, and relates to a preparation method of 3, 3 ', 4, 4'-tetramethyl diphenyl alkane. Adding aldehyde into a reactor filled with o-xylene and organic sulfonic acid, reacting for 20-90 minutes under normal pressure to obtain a crude product, cooling after the reaction is completed, washing the crude product with water for three times, separating water and oil phases, and distilling and purifying under reduced pressure or normal pressure to obtain a 3, 3 ', 4, 4'-tetramethyl diphenyl alkane product. Compared with the prior art, the method has the advantages that the use of a large amount of concentrated sulfuric acid is avoided, the reaction time is greatly shortened through the catalytic action of organic sulfonic acid, the selectivity of 3, 3 ', 4, 4'-tetramethyl diphenylalkane is improved, and the synthesis efficiency of 3, 3 ', 4, 4'-tetramethyl diphenylalkane is improved.

The invention relates to the technical field of catalytic oxidation, in particular to a preparation method of a CoZr-NF monolithic catalyst for catalytic oxidation of o-xylene. A powdery catalyst is used for carrying out catalytic oxidation on o-xylene, and the catalyst is low in catalytic efficiency, easy to block a reactor and not easy to recover. In order to solve the technical problems, the invention provides the preparation method of the CoZr-NF monolithic catalyst for catalytic oxidation of o-xylene, cobalt oxide and zirconium oxide are successfully doped in foamed nickel through an ultrasonic atomization decomposition method, a monolithic catalytic oxidant is obtained, and the monolithic catalytic oxidant has good catalytic activity and stability and can be used for catalytic oxidation of o-xylene. The conversion rate of o-xylene can be at least 90% within the reaction temperature range of 210 DEG C or below, and the method has good application prospects.

The invention provides a shape memory cyanate ester composite material as well as a preparation method and application thereof, and relates to a shape memory material. The invention provides a preparation method of a shape memory cyanate ester composite material, which comprises the following steps: thermally mixing cyanate ester, a monomer with a flexible molecular chain segment and an organic solvent, and curing to obtain the shape memory cyanate ester composite material, the organic solvent is prepared from one or more of N, N-dimethylacetamide, acetonitrile, propionitrile, methylbenzene, dimethyl sulfoxide, pyridine, p-xylene, o-xylene, m-xylene, ethyl acetate and N-methyl pyrrolidone; the ratio of the mass of the cyanate ester to the volume of the organic solvent is 1g: (0.1-0.8) mL. The organic solvent is adopted for toughening, the toughness and durability of the shape memory cyanate ester composite material can be remarkably improved on the basis of ensuring the shape memory characteristic, and the toughening method is simple and wide in application range.

The invention discloses a centrifugal blowing control system and a control method for preparing phthalic anhydride by oxidizing o-xylene. The centrifugal blowing control system comprises a microcontroller, an oxidation fan arranged on one side of an air inlet of the oxidation reactor, a mass flow meter arranged on one side of a material inlet of the oxidation reactor, a reaction product monitor arranged on one side of a material outlet of the oxidation reactor, and a temperature sensor arranged in the oxidation reactor; the control method comprises the steps that oxidation reaction parameters are detected in real time, and a dynamic interlocking model between the current air outlet volumes of the oxidation fans is established based on the feeding amount and the reaction product concentration; and recalculating the required current air outlet volume according to the dynamic interlocking model, and adjusting the rotation frequency of the oxidation fan according to the current air outlet volume. According to the method, multi-parameter cooperative regulation and control are achieved, accurate air volume adaptation is achieved, manual valve adjustment is reduced, the workload is reduced, meanwhile, the process matching performance is improved, the energy consumption of the system can be effectively reduced, the production cost is reduced, and the phthalic anhydride yield is increased.

The invention relates to the technical field of foaming compositions, and particularly discloses a low-thermal-conductivity foaming composition for a low-density quick release system and a preparation method of the low-thermal-conductivity foaming composition. The invention relates to a low-thermal-conductivity foaming composition for a low-density quick-release system. The low-thermal-conductivity foaming composition is prepared from the following raw materials in parts by weight: 13-14 parts of cyclopentane, 130-140 parts of polymethylene polyphenyl isocyanate, 50-60 parts of polycarbonate diol, 25-30 parts of o-xylene ammonium ether, 1.6-1.8 parts of deionized water, 3-4 parts of an emulsifier and 7-10 parts of modified composite fibers. The low-thermal-conductivity foaming composition for the low-density and quick-release system has the advantages of high foam closed cell rate and low thermal conductivity coefficient.

The application discloses a kind of twin ZSM-5 molecular sieve and synthesis method thereof, belong to inorganic chemistry technical field.The twin ZSM-5 molecular sieve is covered by the (010) crystal surface of one coffin-shaped ZSM-5 to the (100) crystal surface of another coffin-shaped ZSM-5, so that the molecular sieve surface has higher straight channel exposure ratio.Preparation process includes: (i) water, sodium hydroxide, aluminum source, template agent, silicon source are mixed and stirred to obtain synthesis gel A;(ii) three kinds of molecular sieves MCM-35, MOR, MCM-22 are added to alkaline environment according to the ratio of 1:2:4, and alkaline heat treatment is carried out to obtain mixture B containing "mfi, mor, mel" three kinds of structural units;(iii) A, B are mixed according to the water content of 1:1, and ZSM-5 molecular sieve product is obtained by hydrothermal crystallization.For the "primary aromatic hydrocarbon mixture" obtained after benzene, toluene, p-xylene are separated from the aromatic hydrocarbon mixture obtained by petroleum and non-petroleum route, twin ZSM-5 molecular sieve shows enhanced selectivity to o-xylene and m-xylene due to higher "straight channel exposure ratio" on the surface.

The invention belongs to the technical field of organic mixture separation, and particularly discloses a production process for cutting and purifying DCPD (dicyclopentadiene) by cracking a C9 raw material. A cracking C9 raw material is fed into a light component removal cutting tower (QL), light components such as ethylbenzene, m-xylene, o-xylene and styrene with the boiling point lower than 160 DEG C are separated out from the tower top, a mixture containing a target product and distilled out from a tower kettle is fed into a heavy component removal cutting tower (QH), components with the boiling point higher than 180 DEG C are separated out from the tower kettle, and a DCPD-rich product with high purity and yield is obtained from the tower top. Based on systematic research on boiling point difference of cracked C9 components, the invention provides a technical scheme of combining step-by-step rectification and cutting with directional separation, and aims to realize efficient enrichment of DCPD with low energy consumption and short process and provide a new path for high-valued utilization of cracked C9 raw materials.

The invention discloses a method for preparing aromatic carboxylic acid through solvent-free gas-liquid micro-interface catalytic oxidation. According to the method, o-xylene and halide thereof are used as raw materials, cobalt, manganese and bromine are used as composite catalysts, nano graphene, phthalic anhydride and derivatives thereof are used as additives, atomic oxygen is used as an oxidizing agent, and chlorophthalic anhydride is prepared through catalytic oxidation under normal pressure. The method has the advantages that by adding the nano graphene, diffusion and dispersion of a gas oxidizing agent are accelerated, a gas-liquid micro-interface system is strengthened, a normal-pressure liquid-phase oxidation reaction is achieved, and the problem that a traditional high-pressure oxidation reaction is low in safety coefficient is solved. The process product is easy to separate, the catalyst is easy to recover, and the method is suitable for industrial processes.

The invention provides a large-area photovoltaic device PTAA hole transport layer and a preparation method thereof, and a perovskite cell, and the preparation method comprises the steps: dissolving PTAA in a green solvent of o-xylene and / or anisole, and forming a precursor solution with the concentration of 0.75-3 mg / mL; depositing on the surface of a substrate through a solution method process; then vacuum auxiliary deposition is carried out, and standing is carried out for 10-90 s under the vacuum degree of 10-100 Pa so as to precisely regulate and control solvent volatilization; and finally, annealing for 5-30 minutes at the temperature of 100-130 DEG C to obtain the PTAA hole transport layer. Through the synergistic effect of the green solvent system and the vacuum-assisted deposition process, the uniformity and compactness of the PTAA film layer on the large-area substrate are remarkably improved, and the defects of strips, water stains and the like are effectively eliminated; when the material is applied to a perovskite battery, upper perovskite can be induced to form a high-quality thin film, interface defects are reduced, and non-radiative recombination is inhibited.

Disclosed are methods and systems for quantitation of benzene, toluene, ethyl benzene, o-xylene, m-xylene, and p-xylene in aromatics recovery complexes. High-performance liquid chromatography using a carbon stationary phase and a gradient mobile phase is performed. The carbon stationary phase can be a porous graphitic carbon stationary phase. The mobile phase includes an organic acid in water and an alcohol. The organic acid can include formic acid, and the alcohol can include methanol. The methods and systems achieve a resolution between xylene isomer peaks of greater than 2.0 when sampling industrial process streams in aromatic recovery complexes.

A feed mixture comprising one or more xylene isomers and C9+ aromatic hydrocarbons may be separated in a first distillation column to obtain a first overhead stream comprising m-xylene and / or p-xylene and a first bottoms stream comprising o-xylene and C9+ aromatic hydrocarbons. The first bottoms stream may be optionally isomerized through liquid-phase isomerization and fed to a second distillation column to obtain a second overhead stream comprising at least o-xylene and a second bottoms stream comprising C9+ aromatic hydrocarbons. The second overhead stream may be optionally isomerized through liquid-phase isomerization. Liquid-phase isomerization may occur upon at least one of the first bottoms stream, the second overhead stream, an optional side stream obtained from the first or second distillation columns, or within the first or second distillation columns, such that the second overhead stream or an isomerized second overhead stream is rich in p-xylene.