41 results about "Durene" patented technology

The invention relates to an oxide catalyst for high-activity and high-selectivity production of a target product pyromellitic dianhydride in the process of producing pyromellitic dianhydride through durene air selective oxidation. A multi-component efficient system is used for construction for preparation. The preparation method comprises the following steps: fully and uniformly mixing a certain amount of a main active component oxide and an auxiliary agent metal hydrochloric acid or an ionic liquid aqueous solution, carrying out a hydrothermal enhancement process to obtain catalyst active precursor slurry, adding a dilution auxiliary agent, and drying and roasting the slurry prepared in the previous step under certain conditions to obtain the efficient metal synergistic oxide catalyst. On the basis of coordinated benefit application of different components in a composite oxide material, the metal synergistic oxide is synthesized through hydrothermal heat assistance, the metal synergistic oxide has excellent catalytic performance in a reaction for producing pyromellitic dianhydride from durene, the yield of a target product is increased, and the metal synergistic oxide is suitable for industrial application.

The present application belongs to the technical field of aromatic hydrocarbon production, and relates to a method and system for producing trimethylbenzene and quarterphenyl by alkylation. Light aromatic hydrocarbons and methanol are used as raw materials, and alkylation is carried out under the catalysis of a modified molecular sieve catalyst and at a temperature of 250-600 DEG C. The material after alkylation is subjected to further alkylation under the catalysis of the modified molecular sieve catalyst and at a temperature of 250-600 DEG C. The modified molecular sieve catalyst is composed of a molecular sieve and a metal oxide supported in the molecular sieve, the molecular sieve is one or more of HY, Hbeta, IM-5, NU87, EU-1 and mordenite, and the metal in the metal oxide is one or more of Mg, Cu, La, Zn and Mo. The present application solves the technical problems of low content of trimethylbenzene and quarterphenyl components and difficult separation of trimethylbenzene and quarterphenyl in the industrial separation method by directly producing trimethylbenzene and quarterphenyl.

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 discloses a molecular sieve catalyst for synthesizing dianhydride from durene by gas phase oxidation, a preparation method of the molecular sieve catalyst and a method for synthesizing dianhydride, the molecular sieve catalyst comprises V, Al, P, O and Ti elements, and contains 0.1wt%-10wt% V2O5, 30wt%-60wt% Al2O3, 30wt%-50wt% P2O5 and 1wt%-20wt% TiO2 in terms of oxides; the structure of the molecular sieve is AFI structure, wherein the Ti element exists in the form of TiO2, and the TiO2 is in the form of anatase. The molecular sieve catalyst comprises V, Al, P, O and Ti elements. The catalyst is suitable for industrial production of dianhydride prepared from durene by gas phase oxidation, and has the characteristics of simple preparation process, high catalytic activity and high dianhydride yield.

The invention belongs to the technical field of organic chemical synthesis, and provides a process for producing pyromellitic dianhydride by liquid-phase oxidation, which comprises the following steps: proportionally adding durene and acetic acid into a batching kettle, matching by using a catalyst, stirring and heating a liquid material to obtain the liquid material, and adding the liquid material into the batching kettle to obtain the pyromellitic dianhydride; when a liquid material is pumped into the micro-channel continuous reactor, the flow of the liquid material pumped into the micro-channel continuous reactor needs to be obtained, pumping peak-valley analysis is carried out according to the flow of the liquid material, a pumping peak time period and a pumping valley time period are screened out, and the change types of the pumping peak time period and the pumping valley time period are identified; according to the method, the oxygen introduction strategy is formulated, the gas introduction adjustment amount is obtained, and the oxygen introduction amount is dynamically adjusted, so that oxygen introduction and liquid material pumping are highly coordinated in the time dimension, and the problems of violent reaction fluctuation or incomplete reaction and the like caused by imbalance of the gas-liquid proportion are solved.

The invention relates to the technical field of pyromellitic dianhydride crystallization, in particular to a high-purity pyromellitic dianhydride continuous crystallization production method which comprises the following steps: introducing durene gas and oxygen-enriched gas into an oxidation reactor at the same time to output pyromellitic dianhydride gas; trapping pyromellitic dianhydride crude product particles; preparing a pyromellitic dianhydride test solution; the comprehensiveness of pyromellitic dianhydride gas trapping is judged; determining a comprehensive adjustment mode according to the comprehensive judgment result, namely adjusting the pressure difference in the oxidation reactor, or determining a crystallization mode of continuous crystallization, namely determining the single feeding amount in the crystallization process, or adjusting the reset frequency of the feeding position change in the crystallization process; and continuously crystallizing the pyromellitic dianhydride solution to separate out a pyromellitic dianhydride crystal finished product. According to the invention, the crystallization efficiency is improved, and the uniformity of crystallized crystals is improved.

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 utility model discloses a reactor pressure stabilizing device for synthesizing durene, which relates to the field of pressure stabilization of an inner cavity of an L fixed fluidized bed and comprises a fixed fluidized bed, a first pressure sensor is mounted on the periphery of the fixed fluidized bed, and the sensing end of the first pressure sensor is inserted into the inner cavity of the fixed fluidized bed. A pressure relief mechanism is installed on the periphery of the fixed fluidized bed and located below the first pressure sensor, a pressure supplementing mechanism is installed at the position, symmetrical to the pressure relief mechanism, of the periphery of the fixed fluidized bed, and a downward pressing mechanism penetrating through an inner cavity of the pressure supplementing mechanism is installed on the periphery of the pressure supplementing mechanism. By arranging the pressure supplementing mechanism and the pressure relief mechanism, the pressure supplementing operation or the pressure relief operation can be performed on the fixed fluidized bed according to the real-time pressure in the fixed fluidized bed, so that the reaction pressure in the fixed fluidized bed is maintained.

The utility model discloses an improved nitrogen supercharging device for synthesizing durene through alkylation of unsym-trimethylbenzene and methanol, which relates to the field of piston type booster pumps and comprises a transverse pipe, a vertical pipe protruding upwards is integrally formed above the outer wall of the transverse pipe, and the inner wall of a top opening of the vertical pipe is in threaded connection with a threaded connector. The threaded connector penetrates to the position above the vertical pipe, a sealing ring is installed at the butt joint position of the vertical pipe and the threaded connector, a hydraulic push cylinder is installed at the top of the threaded connector through a flange piece, a piston plate is installed at the bottom end of a piston rod part of the hydraulic push cylinder, and the hydraulic push cylinder is located in an inner cavity of the vertical pipe. One-way mechanisms are installed at the two ends of the inner wall of the transverse pipe. By arranging the one-way mechanism with the arc-shaped plate, the problem of abrasion caused by reciprocating motion of the ball sealer can be effectively solved, and the problem that the pressurizing effect is reduced further can be solved through the design of the one-way mechanism.

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.

The present invention belongs to the technical field of gasoline additives, and relates to a gasoline octane number additive, a preparation method thereof and an application. By weight, the gasoline octane number additive comprises: 35-55 parts of mixed heavy aromatics, 18-35 parts of p-xylene, and 5-20 parts of 3,5-xylenol. Among them, the mixed heavy aromatics comprise: 20-35 parts of mesitylene, 20-30 parts of pseudocumene, 15-25 parts of durene, 10-20 parts of dicyclopentadiene, and 5-10 parts of naphthalene. The gasoline octane number additive further comprises 1-6 parts of a regulator. The preparation method of the gasoline octane number additive comprises: mixing each component by mass, stirring, and standing to obtain the gasoline octane number additive. The product of the present invention can effectively improve the gasoline octane number, and has the advantages of simple process, good anti-knock performance, unrestricted usage amount, and environmental protection.

The invention discloses a method for preparing durene by utilizing unsym-trimethylbenzene and methanol, which comprises the following steps: mixing unsym-trimethylbenzene, methanol and hydrogen, heating and gasifying, feeding into a fixed bed reactor, and carrying out alkylation reaction through a molecular sieve catalyst with hierarchical pore distribution to prepare durene, after a reaction product flowing out of the alkylation reactor is subjected to gas-liquid separation and oil-water separation, liquid-phase hydrocarbon components enter a rectification separation system, and light hydrocarbon with the carbon number of C6 or below, methylbenzene, xylene, trimethylbenzene, tetramethylbenzene and aromatic hydrocarbon fractions with the carbon number of C11 or above are separated out. The mesoporous channel of the catalyst increases the contact probability of the raw material and the active site of the molecular sieve, promotes the playing of the activity of the catalyst in a fixed bed, reduces the diffusion resistance of the raw material and the product, promotes the rapid diffusion of the product, and reduces the occurrence of side reactions, so that the conversion rate of unsym-trimethylbenzene and the selectivity of durene are improved; therefore, high durene yield can be obtained.

The invention discloses a product separation device for producing pyromellitic dianhydride by durene, and relates to the technical field of chemical synthesis, the product separation device comprises a reaction cylinder, an upper cover and a bottom support, the reaction cylinder is connected with a gas supply assembly, the bottom support is connected with an opening and closing mechanism, a heating crucible is placed in the bottom support, and the heating crucible is connected with the gas supply assembly; a discharging connector is formed in the side wall of the reaction cylinder, a separating mechanism is connected to the discharging connector, and a feeding assembly is arranged on the edge of the reaction cylinder; the bottom support is driven to be opened or closed through the opening and closing mechanism, raw materials are conveyed into the heating crucible in the bottom support through the feeding assembly, air is continuously fed into the reaction cylinder through the air feeding assembly in the reaction process, a product pyromellitic dianhydride is obtained after air oxidation, generated gaseous pyromellitic dianhydride is subjected to desublimation through the separation mechanism, and solid pyromellitic dianhydride is obtained. Through the structure, the pyromellitic dianhydride synthesis and separation efficiency is effectively improved, and the possible leakage problem of gaseous pyromellitic dianhydride in the separation process is avoided.

The present application belongs to the technical field of oil exploration, and relates to a method for identifying late-stage natural gas charging proportion. The method comprises the following steps: calculating a crude oil conversion rate; calculating a calculated value of a gas-oil ratio of a reservoir; establishing a corresponding relationship between the sum of the absolute concentrations of 3-methyl durene and 4-methyl durene and a measured value of the gas-oil ratio of the reservoir; taking the sum of the angle concentrations as a benchmark, adjusting the calculated value of the gas-oil ratio of the reservoir, so that the late-stage natural gas proportion is 0-99%, and obtaining a late-stage natural gas charging proportion identification chart; detecting the sum of the absolute concentrations of 3-methyl durene and 4-methyl durene in the crude oil to be evaluated; and based on the sum of the absolute concentrations and the measured value of the gas-oil ratio of the reservoir, according to the late-stage natural gas charging proportion identification chart, the identification of the late-stage natural gas charging proportion in the oil and gas reservoir to be evaluated is realized. The method is fast, intuitive and easy to operate, and improves the speed and accuracy of the identification of the late-stage natural gas charging proportion.

The application discloses a method for preparing trimethylbenzene and tetramethylbenzene by methylating ethylbenzene-containing octa-aromatic hydrocarbon and methanol. The method comprises the following steps: contacting the ethylbenzene-containing octa-aromatic hydrocarbon and methanol with a methylation catalyst under the condition of hydrogen and / or water to prepare trimethylbenzene and tetramethylbenzene; and the methylation catalyst is a metal-modified surface-silicon-rich ZSM-5 full-crystalline molecular sieve catalyst. The method can strengthen the catalyst's activity of removing ethylbenzene, promote the conversion of ethylbenzene, inhibit the reaction of ethylbenzene and methanol to generate methyl-ethylbenzene byproducts, improve the quality of trimethylbenzene and tetramethylbenzene, improve the quality of C8 aromatic hydrocarbon by effective conversion of ethylbenzene, and reduce the purity and cost requirements of raw materials.

The present invention relates to the technical field of treatment of durenyl waste liquid, and specifically to a device and process for treating durenyl waste liquid, comprising a fixed support stand, an adsorption treatment body, a fixed support base, a reaction tank, a discharge hopper and a cleaning body, wherein the reaction tank is fixedly connected to the interior of the fixed support base, the fixed support stand is evenly fixedly installed on the upper parts of both sides of the fixed support base, the adsorption treatment body is arranged at the upper end of the fixed support stand, the cleaning body is fixedly connected to the upper end of the fixed support base, and the cleaning body is located above the adsorption treatment body, and the discharge hopper is arranged at the outer end of the cleaning body. The present invention can fully pre-treat the durenyl waste liquid through the provided cleaning body, can clean and discharge large particles of impurities and oil in the waste liquid, and can conveniently perform adsorption and sufficient impurity removal treatment on the waste liquid through the provided adsorption treatment body, so that the waste liquid can be conveniently subjected to in-depth reprocessing.

The application relates to a method and system for purifying durene, and belongs to the technical field of durene purification. The method comprises the following steps: performing primary suspension crystallization on durene-rich liquid at a set cooling speed to obtain primary suspension crystallization slurry with a first temperature; performing solid-liquid separation on the primary suspension crystallization slurry to obtain primary suspension crystallization mother liquor and primary suspension crystallization crystals; performing secondary suspension crystallization on the primary suspension crystallization mother liquor at a set cooling speed to obtain secondary suspension crystallization slurry with a second temperature; performing solid-liquid separation on the secondary suspension crystallization slurry to obtain secondary suspension crystallization crystals; and performing layer-type melt crystallization on the mixed crystals of the primary suspension crystallization crystals and the secondary suspension crystallization crystals to obtain durene crystallization products. Under the synergistic action of the two-stage suspension crystallization and the layer-type melt crystallization, the application can realize high yield and high purity of durene, and the method does not have a gasification and condensation process, and has low energy consumption.

The invention relates to the technical field of pyromellitic dianhydride preparation, and discloses a catalyst with durene oxidation function and a preparation method and application thereof.The catalyst comprises a carrier and a coating loaded on the carrier, the coating comprises active components and a heat-resistant fiber material, and the active components comprise V, Cs, Ti, Nb, Sb, optional P and optional Zr. According to the catalyst containing the heat-resistant fiber material, the bonding strength of active components can be improved, the loss rate of the active components of a catalyst coating is reduced, and the situation that the service life of the catalyst is affected due to component loss is reduced.

The invention belongs to the technical field of preparation of organic compounds, and particularly relates to a preparation method of high-concentration flaky durene, which comprises the following specific steps: S1, preparing a modified adsorbent; s2, removing impurities from the raw materials; s3, regenerating the modified adsorbent; s4, dissolving and crystallizing; and S5, separating and drying. According to the method, the modified 13X molecular sieve is adopted, so that the same technical effect of adsorbing and removing polycyclic aromatic hydrocarbon impurities as the existing 13X molecular sieve activated by high-temperature roasting can be realized, and the energy consumption is far lower than that of the existing process for activating the 13X molecular sieve by high-temperature roasting; meanwhile, the crystal purity and yield of the flaky durene prepared on the basis of lower energy consumption can reach the level of an existing process, and the crystal is thinner, so that a subsequent pyromellitic dianhydride preparation process is facilitated.

The invention discloses a durene feeding device and a durene feeding method, and belongs to the technical field of chemical engineering. The feeding method comprises the following steps: (1) hot air enters from the bottom end of the absorption tower, molten durene is pumped from the top end of the absorption tower, and upward hot air in the absorption tower is saturated by downward molten durene; (2) molten durene flowing out of the bottom end of the absorption tower enters a durene storage tank and is circularly pumped into the absorption tower through a feeding pump; (3) before the saturated hot air flowing out of the top end of the absorption tower enters a buffer tank, the saturated hot air enters gas chromatography through a branch to analyze the content of durene in saturated steam; and (4) saturated steam flowing out of the top end of the absorption tower enters a buffer tank and is mixed with another stream of hot air, and formed mixed gas serves as reaction gas of the single-tube reactor. According to the invention, the feeding amount of durene is stable and adjustable in a range of 22-226 g / h, the concentration of durene in the reaction gas can be controlled at 6.7-26.7 g / m < 3 >, and the requirement of evaluating a pyromellitic dianhydride catalyst on a single-tube reactor is met.

The application discloses a production method of pyromellitic acid. The method comprises the following steps: contacting tetramethylbenzene with a catalyst to generate an oxidation reaction in the presence of an oxygen-containing gas to obtain pyromellitic acid; and the catalyst comprises carbon nanomaterial and alkali metal peroxysulfuric acid hydrogen salt. The pyromellitic acid prepared by the method of the application has no transition metal salt residue, the reaction has no corrosion, and the method of the application has the advantages of high pyromellitic acid yield.

The invention relates to the field of catalysts, and discloses a catalyst for synthesizing pyromellitic dianhydride through durene gas-phase oxidation, the catalyst contains a molecular sieve with an AFI structure, a V element and a Ti element, and the XRD diffraction pattern of the catalyst has main diffraction characteristic peaks when 2 theta = 7.4, 12.9, 14.9, 19.8, 21.0, 22.4, 26.0, 27.4, 29.1, 30.1, 34.6, 36.1, 37.8, 39.2, 41.2, 44.1, 54.3, 56.6, 62.7, 64.0, 69.0 and 69.8. The preparation method of the catalyst comprises the steps that a vanadium source, a titanium source and raw materials used for synthesizing the molecular sieve of the AFI structure form a material to be subjected to hydrothermal crystallization, then hydrothermal crystallization and roasting are conducted, and the pH of the material to be subjected to hydrothermal crystallization is 1-4. The catalyst provided by the invention is especially suitable for oxidation synthesis of pyromellitic dianhydride from durene, and has high pyromellitic dianhydride yield. When the catalyst is used for synthesizing pyromellitic dianhydride through durene gas-phase oxidation, the yield of pyromellitic dianhydride can reach 86.2%, and a good technical effect is achieved.

The invention provides an MFI molecular sieve-metal composite material, the material contains a molecular sieve with an MFI structure and active component elements, the active component elements comprise V and Ti, the Ti element is not on a framework of the molecular sieve with the MFI structure, and the preparation method comprises the following steps: forming a material to be subjected to hydrothermal crystallization from a vanadium source, a titanium source and raw materials for synthesizing the molecular sieve with the MFI structure, and then carrying out hydrothermal crystallization and roasting. The composite material provided by the invention adopts the molecular sieve and the titanium dioxide with specific crystal forms, and exerts excellent catalytic performance, especially oxidation performance, such as the performance of preparing pyromellitic dianhydride through durene gas phase oxidation, so that higher pyromellitic dianhydride yield is obtained.

The invention belongs to the technical field of direct preparation of liquid fuel from synthesis gas, and particularly relates to a catalyst and a method for preparing liquid fuel from synthesis gas through direct conversion. The catalyst comprises a component A and a component B, the component A and the component B are compounded together in a mechanical mixing mode, an active component of the component A is a metal oxide, and the component B is an ITQ-13 molecular sieve or a heteroatom modified ITQ-13 molecular sieve. The catalyst is used for preparing liquid fuel by directly converting synthesis gas, and the synthesis gas is used as a reaction raw material and is subjected to a conversion reaction on a fixed bed or a moving bed. The reaction process has very high product yield and selectivity, the selectivity of liquid fuel consisting of C5-C11 can reach 50-70%, the selectivity of aromatic hydrocarbon in C5-C11 is lower than 35%, the selectivity of durene is lower than 2%, the selectivity of byproduct methane is lower than 10%, and the method has a very good application prospect.

The invention provides a composite catalyst and a method for directly preparing durene from synthesis gas. The composite catalyst comprises a metal-based catalyst, a chambering HZSM-5 molecular sieve and an HMCM-22 molecular sieve in a mass ratio of 1: (0.5-3.0): (0.05-0.5), wherein the metal-based catalyst comprises a metal oxide, and metal elements in the metal oxide comprise copper, zinc and zirconium in a molar ratio of 3: (1.0-2.0): (0.1-6.0). The inactivation rate of the catalyst can be effectively slowed down by increasing the proportion of ZrO2 in the copper-based catalyst, the embodied medium catalytic activity is just matched with the treatment capacity of a molecular sieve, and less aliphatic hydrocarbon selectivity and higher durene selectivity are obtained; through design and modification of the composite catalyst, the problems of easy deactivation and activity matching of the catalyst are solved, and high-selectivity production of durene is realized.

The invention provides a catalyst containing a TPZ-3 / MOR eutectic molecular sieve as well as a preparation method and application of the catalyst. The catalyst comprises a binder, a metal active component, a metal additive and a TPZ-3 / MOR eutectic molecular sieve. The preparation method of the catalyst comprises the following steps: mixing and molding the TPZ-3 / MOR eutectic molecular sieve and the binder, then dipping the molded TPZ-3 / MOR eutectic molecular sieve and the binder in a precursor solution of the metal active component, dipping the molded TPZ-3 / MOR eutectic molecular sieve and the binder in a precursor solution of the metal additive, and then performing activation and reduction to obtain the catalyst containing the TPZ-3 / MOR eutectic molecular sieve. The catalyst disclosed by the invention is applied to isomerization synthesis of durene from tetramethylbenzene, so that the reaction efficiency can be greatly improved, the conversion rate of durene and tetramethylbenzene and the selectivity of durene are remarkably improved, and the yield of durene is improved.

This invention relates to the field of mesitylene production technology, specifically a method for producing benzene and mesitylene from xylene. The method comprises the following steps: xylene undergoes an alkyl transfer reaction catalyzed by a catalyst in a reactor; the reaction products are separated to obtain a xylene-mesitylene mixture and toluene; the xylene-mesitylene mixture is then cryogenically crystallized to obtain mesitylene. This method for producing benzene and mesitylene from xylene produces products with stable composition and high selectivity for mesitylene. Under specific catalyst and reaction conditions, benzene and mesitylene can be controllably produced without anhydrous formation. The mesitylene selectivity is between 52% and 64%, and the product composition is stable. This method avoids the problem of acidic water formation caused by using methanol as a raw material, thus improving production efficiency and reducing production costs.

The utility model discloses a separation and purification device for durene, which relates to the technical field of durene production and comprises a purification tank, a support column is arranged at the lower end of the purification tank, a feed port is arranged at the top end of the purification tank, and a purification component and a stirring component are arranged in the purification tank. The purification assembly and the stirring assembly are both fixed on a top plate of the purification tank, a crystal scraping assembly is arranged on the purification assembly, and a discharging assembly is arranged at the lower end of the purification assembly. Through mutual cooperation of the first scraping assembly, the second scraping assembly and the discharging assembly, the problems that an existing durene separation and purification device is difficult in material taking, meanwhile, durene has toxicity, the danger of manual material taking is high, and the practicability of the device is poor are solved.

The invention provides an amorphous silica-alumina solid acid catalyst as well as a preparation method and application thereof, in particular to a method for preparing durene by adopting a sanding method, and relates to the technical field of catalysis and organic synthesis. The preparation method comprises the following steps: mixing an amorphous silicon source, a soft template agent, a growth inhibitor, hexadecyl trimethyl ammonium bromide and water; mixing organic aluminum with an organic solvent; and mixing the two obtained mixed solutions, carrying out hydrothermal crystallization, and carrying out solid-liquid separation, drying and roasting to obtain the amorphous silica-alumina solid acid catalyst. The solid acid catalyst synthesized in situ is rich in L acid, large in specific surface area, stable in active center, rich in mesopores and high in catalytic performance. The invention provides a method for preparing durene by adopting a sanding method. The conversion rate of unsym-trimethylbenzene and the yield of durene are high; by further utilizing the excellent mass transfer and heat transfer capabilities of the microreactor and combining the characteristics of heterogeneous catalysis and easy separation of the solid catalyst, the reaction rate is remarkably increased, the reaction time is shortened, and the reaction yield is increased.

The invention discloses a catalyst for synthesizing durene from 1, 2, 4-trimethylbenzene, and belongs to the technical field of catalyst preparation, the catalyst comprises the following components by mass: 10-90% of a modified molecular sieve and 10-90% of alumina, the modified molecular sieve is an HZSM-5 molecular sieve or HEU-1 molecular sieve modified by non-metallic elements or two components of the non-metallic elements and metal elements; according to the method, the conversion rate of 1, 2, 4-trimethylbenzene and the selectivity of durene are high, the stability is good, the purity of the obtained durene product is high, the demand quantity of methanol in the reaction process is low, and the catalyst can be regenerated and used for multiple times.