223 results about "P-Xylene" patented technology

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The method is for producing para-xylene using, as a main raw material, a mixed gas of carbon dioxide or carbon monoxide or both thereof and hydrogen. The method including: a reaction step of bringing a raw material mixed gas including the mixed gas into contact with a reaction catalyst under high temperature and high pressure to cause a reaction, to thereby obtain a product gas mixture containing para-xylene; a separation step of cooling the product gas mixture obtained in the reaction step to condense a high boiling point component, to thereby separate the product gas mixture into a water phase containing a water-soluble component, an oil phase containing a xylene mixture, and a gas phase containing an unreacted gas; and a circulation step of mixing at least part of the gas phase having been separated in the separation step into the raw material mixed gas.

Processes and facilities for producing a recycled content organic chemical compound directly or indirectly from waste plastic. Processing schemes are described herein for converting waste plastic (or hydrocarbon having recycled content derived from waste plastic) into useful intermediate chemicals and final products. The waste plastic can be liquified before being introduced to downstream processing. In some aspects, recycled content aromatics (r-aromatics) can be processed to provide recycled content paraxylene (r-paraxylene), which can then be used to provide recycled content terephthalic acid (r-TPA) and / or recycled content polyethylene terephthalate (r-PET).

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 application provides a C8 aromatic hydrocarbon isomerization catalyst and a preparation method and application thereof. The catalyst contains an active component and a carrier; wherein, based on the weight of the carrier, the carrier contains 5wt%-25wt% of HZSM-23, 5-30wt% of mordenite, 20-60wt% of macroporous alumina and 10wt%-25wt% of a binder component. The method comprises preparation of the carrier and loading of the active metal, wherein the preparation process of the carrier is as follows: HZSM-23 molecular sieve, mordenite, macroporous alumina and a binder are mixed and formed, and the carrier is prepared after drying and calcination. The catalyst is used for C8 aromatic hydrocarbon isomerization reaction, and has the characteristics of high ethylbenzene conversion rate and high xylene yield when the xylene is at an equilibrium concentration.

The application discloses a bifunctional catalyst for preparing p-xylene from carbon dioxide and hydrogen in one step, a preparation method and application, relates to the technical field of catalysts for preparing p-xylene from carbon dioxide and hydrogen, and opens up a new way for selectively hydrogenating carbon dioxide into high-value p-xylene; the application comprises alkali metal modified FeMn oxides and ZSM-5 capsule zeolites, and is used for converting CO2 into p-xylene through one-step hydrogenation; in the alkali metal modified FeMn oxides, Mn is dispersed on the oxide phase of Fe; the ZSM-5 capsule zeolites are subjected to hydrothermal treatment with a TPAOH solution, and the external passivated Bronsted acid sites of the ZSM-5 capsule zeolites can inhibit the structuralization reaction of dimethylbenzene; the bifunctional catalyst can realize the conversion of carbon dioxide into p-xylene in one step, has high carbon dioxide conversion rate, high space-time yield of p-xylene, and long catalyst service life.

A fluidized bed device for coupling naphtha and methanol to prepare aromatics and co-produce olefins and its application method are provided. By using the device, under the action of a catalyst, naphtha reacts with methanol to generate product gas containing aromatics and light olefins as main components. The method can efficiently and selectively convert linear and branched aliphatic hydrocarbons into aromatics, while also increasing p-xylene production through aromatic methylation reactions, with the p-xylene content in the xylene mixture exceeding 75 wt %. The fluidized bed reactor achieves increased p-xylene production by controlling the progression of cascade reactions (naphtha→benzene / toluene→p-xylene). Additionally, it utilizes the methylation reaction of benzene / toluene with methanol to provide in-situ heat for the coupled naphtha-methanol aromatization process, thereby achieving autothermal balance.

The invention discloses an application of p-xylene in prevention and control of straight-spot fly imagoes, and belongs to the technical field of agricultural planting research. Aiming at the problems that the yield of the chenopodium quinoa willd is seriously lost by the chenopodium quinoa willd and the existing prevention and treatment means only depend on chemical agents, the natural component p-xylene of the chenopodium quinoa willd is utilized to remarkably attract adults of the chenopodium quinoa willd, and the chenopodium quinoa willd attractant can be directly used for attracting the adults of the chenopodium quinoa willd and also can be used for preparing the attractant for the the concentration of p-xylene in the attractant is 0.1 mu g / mu L to 100 mu g / mu L. The application is green and environment-friendly, does not need to depend on chemical agents, provides a new way for green prevention and control of the adult straight-spot fly, broadens the prevention and control means of the chenopodium quinoa willd pests, and has important practical application value and scientific significance.

A method for producing 2,5-dimethylfuran according to one embodiment of the present invention includes a step for reacting a furan compound having a specific structure with hydrogen in a non-aqueous solvent in the presence of a hydrogenation catalyst. In this method for producing 2,5-dimethylfuran, the hydrogenation catalyst includes at least one type selected from among a first component group and at least one type selected from among a second component group. The first component group includes chromium, molybdenum, manganese, rhenium, ruthenium, rhodium, iridium, nickel, palladium, platinum, copper, zinc, and the like. The second component group includes aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, carbon, and the like.

The utility model provides a cooling device which comprises a cooling cylinder, a plurality of first partition plates and second partition plates which are evenly distributed are arranged in the cooling cylinder, the first partition plates and the second partition plates are installed in a matched mode, a plurality of cooling pipes which are evenly distributed are arranged on the first partition plates and the second partition plates, and a plurality of stirring shafts which are evenly distributed are arranged in the cooling cylinder. And stirring paddles fixedly sleeve the middle parts of the outer arc surfaces of the stirring shafts. According to the cooling device disclosed by the utility model, when the dimethylbenzene stock solution is cooled, the dimethylbenzene stock solution can be continuously and quickly cooled by extending the flowing path of the dimethylbenzene stock solution in the cooling cylinder and matching with the stirring paddle.

Disclosed are apparatuses and processes for preparation and conversion comprising / using: a fractionation chain (4-6) that produces a xylene fraction (24); a xylene separation unit (10) that treats the xylene fraction to produce a para-xylene extract (39) and a raffinate (40); an isomerization unit (11) treating the raffinate to produce an isomerization product (42) of xylenes fed to the fractionation chain; the synthesis gas production unit (14; 15) that treats the hydrocarbon feedstock (30) to produce a synthesis gas (34) containing CO and CO2; a methanol synthesis reaction section (50) that treats the synthesis gas (34) to produce methanol (51); a toluene alkylation reaction section (13) treating the toluene-containing fraction (23) with methanol (51) to produce an alkylation effluent (32) containing xylene and fed to the fractionation chain.

This application provides an isolation structure and its manufacturing method. The isolation structure includes a substrate, an isolation trench, a flexible dielectric layer, and a filling layer located within the substrate. The flexible dielectric layer is made of hydroxyl-para-xylene. The filling layer covers the surface of the flexible dielectric layer and fills the isolation trench. This flexible dielectric layer can reduce cracks caused by excessive stress in subsequent thermal processes and can adapt to spatial distortion caused by the expansion of residual gas in the isolation trench through deformation under thermal conditions, reducing damage to the substrate, enhancing the electron coupling ability of the HiK material, improving the yield of devices on the substrate, and reducing dark current in devices and white spots in display images from the source. In addition, this flexible dielectric layer does not contain metal, so it will not cause metal ion contamination to the substrate. It eliminates the need for an additional isolation layer, improving the performance of devices on the substrate while simplifying device structure and processes and reducing manufacturing costs.

This utility model discloses an integrated drying and gas purification machine for slide staining, including a machine body, a protective door hinged to the left side of the front end of the machine body, a placement platform in the middle of the bottom wall of the machine body, an electric heating wire on the upper side of the inner part of the machine body, a cavity in the lower side of the inner part of the machine body, an air inlet with an air inlet pipe in the left side of the upper end of the machine body, and an exhaust port on the right end of the machine body. It also includes a purification mechanism; the purification mechanism includes a filter chamber, a filter element, a sealing door, and a fixing component. The filter chamber is located on the right side of the inner part of the machine body, and the filter element is placed inside the filter chamber. A sealing door is hinged to the upper side of the top wall of the filter chamber. The fixing component is located inside the filter chamber and is used to fix the filter element. This integrated drying and gas purification machine for slide staining optimizes the driving method, improves the stability of the filter element during purification, and ensures the purification effect of xylene.

The present application relates to a kind of paraxylene adsorbent and its preparation method and application, it is related to mixed xylene separation technical field, the active component of the paraxylene adsorbent includes Silicalite-1 molecular sieve;The Silicalite-1 molecular sieve has hydrophobicity, there is no structural defect, contain mesoporous structure at 2.6nm and crystal is the flaky structure of preferential orientation growth along the direction of mass transfer benefit.This application uses this special crystal structure and the Silicalite-1 molecular sieve of morphology as active component, after rolling ball forming, paraxylene adsorbent of spherical shape is made, effectively solve the existing paraxylene adsorbent due to strong water absorption and lead to deactivation, slow adsorption speed and low paraxylene adsorption capacity and other technical problems.

The application discloses a kind of molecular sieve-based microsphere fluidized bed catalyst and its preparation method and application.The catalyst includes transition metal modified molecular sieve, molecular sieve selects at least one in ZSM-5, ZSM-11, ZSM-12, Silicate-I@ZSM-5, Silicate-I@Y, Silicate-I or Silicate-II type molecular sieve, its outer surface Si / Al molar ratio is greater than 250, bulk Si / Al molar ratio is 30~250;Transition metal is selected from at least one in Mn, Cu, Co or Ni.The catalyst of the application is used in the reaction of aromatic selective shape methylation preparation p-xylene, significantly reduces the abrasion of catalyst, improves the conversion rate of toluene and the selectivity of p-xylene.

The utility model discloses a p-xylene crystallization device which at least comprises a raw material input pipeline, the at least one crystallization unit is connected with the raw material input pipeline; the at least one separation unit is connected with the outlet of the crystallization unit; the mother liquor buffer tank is connected with an outlet of the separation unit; an inlet of the mother liquor pump is connected with an outlet of the mother liquor buffer tank; the subcooler is connected with an outlet of the mother liquor pump; the industrial wind input pipeline is connected with the other inlet of the mother liquor pump; and the industrial wind output pipeline is connected with the other outlet of the mother liquor pump. According to the p-xylene crystallization device provided by the utility model, the operation stability of the crystallization device can be improved.

The invention relates to the technical field of butanone-water azeotropic system separation, in particular to a method for separating butanone from a butanone-water azeotropic system. According to the method for separating butanone from the butanone and water azeotropic system, a device is used for separation, and the device comprises an extractive distillation tower, an extraction agent recovery tower and a water-extraction agent separation tower. According to the method, p-xylene is taken as an extraction agent, butanone in a butanone and water azeotropic system is extracted by an extractive distillation tower, and a butanone-p-xylene mixture and a water-p-xylene mixture are obtained. The butanone-p-xylene soluble mixture is rectified and separated into butanone and p-xylene through an extractant recovery tower. And rectifying and separating the water-p-xylene solution mixture into water and p-xylene through a water-extractant separation tower. The extracting agent disclosed by the invention has the advantages of low intersolubility with water and high selectivity to butanone, is low in extracting agent residue and stable in separation effect, and has a good application prospect in separation of a butanone-water azeotropic system.

The invention discloses a start-up optimization method for an aromatic hydrocarbon combination unit, and belongs to the technical field of petrochemical engineering accessories. Comprising the following steps: S1, sequentially connecting a reformate tower, a stripping tower, a redistillation tower, an adsorption feeding tank, an extract tower and a p-xylene tower to extract a PX product; s2, leading out a first reflux pipeline between the stripping tower and the redistillation tower, and connecting the first reflux pipeline to an adsorption feeding tank; s3, in a start-up preheating stage, feeding a material at the bottom of the stripping tower to an adsorption feeding tank through a first reflux pipeline, synchronously heating the redistillation tower and the p-xylene tower at the moment, and heating the redistillation tower, the stripping tower and the extract tower in a peak shifting manner; and S4, after preheating is finished, closing the first reflux pipeline, recovering the material to be treated by the redistillation tower, feeding the material into the adsorption feeding tank, and continuously producing PX according to the flow of S1. Through process optimization, the core problems that the C8 circulation temperature rise is blocked and the thermal joint pressure difference is difficult to establish in the start-up stage are effectively solved, the operation steps are simplified, the risk of manual misoperation is reduced, the start-up period is remarkably shortened, the energy consumption is reduced, and safety and economic benefits are achieved.

The invention relates to a method and a system for continuously producing 1, 4-cyclohexanedimethanol, and belongs to the technical field of preparation of 1, 4-cyclohexanedimethanol. The problems of high raw material price, expensive catalyst, low production efficiency, harsh reaction conditions and the like in the existing 1, 4-cyclohexanedimethanol production process are solved. The method comprises the following steps: chloridizing p-xylene to prepare p-xylylene dichloride, hydrolyzing the p-xylylene dichloride to prepare terephthalyl alcohol, and hydrogenating the terephthalyl alcohol to prepare the 1, 4-cyclohexanedimethanol. The method takes p-xylene as a raw material, and is high in production efficiency, good in product quality, green, environment-friendly and low in energy consumption.

Processes and facilities for producing a recycled content organic chemical compound directly or indirectly from waste plastic. Processing schemes are described herein for converting waste plastic (or hydrocarbon having recycled content derived from waste plastic) into useful intermediate chemicals and final products. In some aspects, recycled content aromatics (r-aromatics) can be processed to provide recycled content paraxy lene (r-paraxylene), which can then be used to provide recycled content terephthalic acid (r-TPA) and / or recycled content polyethylene terephthalate (r-PET). In some aspects, the r-PET can include one or more comonomers to form r-co-PET, which can be used in a variety of end use applications.

The invention discloses a targeted chemical adsorption deposition method for acidic sites on the outer surface of a molecular sieve and application of the targeted chemical adsorption deposition method, and belongs to the field of molecular sieve catalysis. The method comprises the following steps: sequentially carrying out a silicon source adsorption process, a vacuum desorption process and a roasting deposition process on a molecular sieve; the molecular sieve is selected from one of a ZSM-5 molecular sieve, an IM-5 molecular sieve and an MCM-22 molecular sieve. According to the deposition method, effective coverage of acidic sites on the outer surface of the molecular sieve can be achieved with the minimum deposition amount, and influences on other properties of the molecular sieve, especially diffusion of reactants and target products, are avoided. The catalyst modified by the method shows high reactant conversion rate and high p-xylene and low-carbon olefin selectivity in the process of co-production of p-xylene and low-carbon olefin through methanol-toluene coupling reaction.

The invention relates to a protective coating and a preparation method and application thereof.The preparation method of the protective coating comprises the following steps that 1, a disilane coupling agent, a monosilane coupling agent containing carbon-carbon double bonds, ethyl alcohol, water and an optional pH regulator are mixed, the volume ratio of the disilane coupling agent to the monosilane coupling agent containing the carbon-carbon double bonds is (3-10): 1, and the mixture is stirred to be uniform; a composite silane solution is obtained; (2) mixing a monosilane coupling agent containing carbon-carbon double bonds, ethanol, water and an optional pH regulator to obtain a monosilane solution; and (3) dip-coating the base material subjected to alkali treatment with the composite silane solution prepared in the step (1), drying for the first time, dip-coating the base material with the monosilane solution prepared in the step (2), drying for the second time, and depositing a poly-p-xylylene layer to form the protective coating, the binding force between the protective coating and the base material is high, the adhesion effect on the base material is good, and the stability between batches is good.

The present invention relates to the technical field of separation of direct coal liquefaction oil, and provides a method for separating and purifying monocyclic aromatic hydrocarbons from direct coal liquefaction oil. The method comprises: (1) performing fractional distillation and composition analysis on direct coal liquefaction oil to determine a fraction having the highest content of monocyclic aromatic hydrocarbons; (2) removing low-carbon alkanes and cycloalkanes from a selected fraction by means of column chromatography; (3) separating toluene, a monocyclic aromatic hydrocarbon mixture, and high-carbon alkanes by means of an atmospheric and vacuum distillation column; (4) purifying ethylbenzene from the monocyclic aromatic hydrocarbon mixture by means of an extractive distillation column; and (5) purifying p-xylene by means of a solvent recovery column. The separation method provided by the present invention can make full use of the composition characteristics of direct coal liquefaction oil to obtain two or three high-purity monocyclic aromatic hydrocarbon monomers at a time without introducing additional chemical reaction steps, showing significant economic and environmental benefits.

The application discloses a super-flexible friction sensor and a preparation method and application thereof, and belongs to the technical field of flexible electronics. The super-flexible friction sensor comprises a sensing layer; the sensing layer comprises a substrate, a first conductive layer, a photoresist layer, an insulating polymer layer and a second conductive layer which are sequentially stacked; the material of the substrate comprises poly-p-xylylene, and the thickness of the substrate is 0.1-3 microns; and the thickness of the super-flexible friction sensor is 20-40 microns. Compared with a conventional friction sensor, the super-flexible friction sensor has smaller thickness, and is more flexible and sensitive. The application further provides a preparation method and application of the super-flexible friction sensor.

The present disclosure relates to a method for preparing paraphthaloyl chloride, and specifically, to a method for preparing paraphthaloyl chloride, the method comprising: performing a reaction in a plurality of temperature intervals, specifically four or more temperature intervals, according to conversion rates to prepare hexachloroparaxylene; and reacting the prepared hexachloro-p-xylene with terephthalic acid to produce paraphthaloyl chloride.

The invention provides a continuous extractive distillation separation method of a p-xylene-propanol azeotropic mixture, and belongs to the technical field of separation. According to the method disclosed by the invention, any two of dibutyl phthalate, N-methyl pyrrolidone and sulfolane are used as extracting agents. The method comprises the following steps: adding a mixed raw material solution of p-xylene and propanol into an extraction tower, then adding an extraction agent, carrying out extractive distillation, extracting a propanol product from the top of the tower, introducing an extraction tower bottom product containing the extraction agent and p-xylene into a solvent recovery tower, and after distillation, extracting a p-xylene product from the top of the tower and discharging the extraction agent from the bottom of the solvent recovery tower; and introducing the extraction agent into the extraction tower for cyclic utilization. The method provided by the invention realizes the separation of the p-xylene-propanol azeotropic mixture, has high separation efficiency, is easy to regenerate and is environment-friendly, and the mass fraction of p-xylene in the separated propanol can be greater than or equal to 99.9%.

The invention discloses a refining blending tank feeding monitoring system and method, and the system comprises a feeding monitoring system which is connected with a feeding monitoring control module, a feeding data collection module, a feeding data processing module, a feeding simulation parameter module, and a feeding intelligent control blending module. The feeding monitoring control module comprises a paraxylene input module, a petroleum raw material input module, an ethylene input module, an intermediate input module, a caprolactam input module, a propylene input module, a flow data monitoring module, a wireless data transmission module and a monitoring data summarization module. According to the refining blending tank feeding monitoring system and method, monitored flow data is processed, including data receiving, data summarization, data calculation, data analysis and material flow data matching, different materials are input according to the matching proportion, the refining effect is improved through data simulation, and the refining effect is improved. And the situation of material waste is not easy to occur.

The invention relates to a high-efficiency energy-saving p-xylene production device, and relates to the technical field of chemical equipment, a bottom plate mechanism of the high-efficiency energy-saving p-xylene production device comprises an inner concave bottom plate capable of moving up and down in a round tank, crystals adhered to the inner wall of the round tank are scraped off by utilizing the rising inner concave bottom, and most reaction liquid can also be pressed into a distillation tank; the liquid pump has the advantages that the later use time of the liquid pump is shortened, the liquid discharge energy consumption is reduced, crystals on the concave bottom plate can be easily scraped, the crystal cleaning efficiency is improved, meanwhile, the bottom of the concave bottom plate is concave, the scraped crystals gather together at the center of the concave bottom plate through gravity, workers can conveniently take out the crystals, and after all the crystals in the tank are scraped, the crystal cleaning efficiency is improved. And the filtering mechanism is used for filtering the scraped crystals and screening the scraped crystals according to the size, so that linkage scraping and screening among a plurality of mechanisms are realized while all the crystals in the tank can be taken out, the collection effect of the device is improved, and waste of small crystals is also avoided.

The application discloses a 2-phenyl-4-pinacol boron-based-2,1-boronazanaphthalene, a 2-phenyl-4-pyrimidyl-2,1-boronazanaphthalene compound and a preparation method thereof, and belongs to the technical field of organic synthesis chemistry. The method is based on a copper-catalyzed selective dehydrogenation boronation reaction strategy, 2-phenyl-2,1-boronazanaphthalene and pinacol diboron ester are used as raw materials, CuCl is used as a catalyst, 4,5-bis(diphenylphosphino)-9,9-dimethyloxyanthracene is used as a ligand, 2-adamantanone is used as an additive, p-xylene is used as a solvent, and 2-phenyl-4-pinacol boron-based-2,1-boronazanaphthalene is efficiently obtained. The 2-phenyl-4-pinacol boron-based-2,1-boronazanaphthalene compound synthesized by the application can be used as a key intermediate, is efficiently converted through a C-B bond, and is convenient for synthesizing a 2-phenyl-4-pyrimidyl-2,1-boronazanaphthalene compound, thereby providing a new way for functional modification of boronazacyclic compounds.

The present disclosure relates to a process for preparing sulfide solid material particles comprising at least the elements Li, P, S and X, the process comprising the steps of: a) providing a lithium sulfide (Li2S) powder, the Li2S powder has a D50 value ranging from 20 m to 500 m as measured by laser diffraction in para-xylene, a specific surface area equal to or greater than 5 m / g as measured by nitrogen adsorption according to the Brunauo-Emitter-Teller (BET) method, b) reacting the Li2S powder of step a) with at least P2S5 and LiX to obtain sulfide solid material particles containing Li, P, S and X; wherein X is selected from the list consisting of F, Cl, I, Br, CN, NC, OCN, NCO, SCN, NCS, and N3, or a combination thereof. The invention also relates to the particles obtained by said method and to the use thereof for producing an electrode, an electrolyte layer or a separator for an electrode.