14 results about "O-Xylene" patented technology

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 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.

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 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 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 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.

The application discloses a preparation method of 2,2'-di(trifluoromethyl)-4,4',5,5'-biphenyl dianhydride, which comprises the following steps: ① iodization reaction of o-xylene to obtain 1,2-diiodo-4,5-xylene; ② coupling reaction of the product of step ① to obtain 2,2'-diiodo-4,4',5,5'-tetramethyl biphenyl; ③ trifluoromethylation of the product of step ② to obtain 2,2'-di(trifluoromethyl)-4,4',5,5'-tetramethyl biphenyl; ④ oxidation of the product of step ③ with an oxidant to obtain 2,2'-di(trifluoromethyl)-4,4',5,5'-biphenyl tetraacid; and ⑤ dehydration and cyclization of the product of step ④ to obtain 2,2'-di(trifluoromethyl)-4,4',5,5'-biphenyl dianhydride. The synthetic route provided by the application has the advantages of mild reaction condition, simple treatment, high efficiency and low cost.

The invention belongs to the technical field of analysis and detection, and particularly relates to an HPLC (High Performance Liquid Chromatography) quantitative detection method for o-methylbenzyl chloride and impurities thereof. The method comprises the following steps: preparing a blank solution, a test solution and a reference solution, respectively injecting the blank solution, the test solution and the reference solution into a liquid chromatograph, recording chromatograms, and calculating according to a peak area normalization method to obtain the content of o-methylbenzyl chloride in the test solution. The content of o-xylylene dichloride and / or o-xylene in the test solution is calculated according to the peak area by an external standard method, and the content of other impurities in the test solution is calculated according to a main component self-contrast method. The separation degree of the main peak and each impurity peak is good, and the precision, the accuracy, the stability, the durability and the reproducibility are all excellent. And a detection technology is provided for quality control of o-methylbenzyl chloride.

This invention provides a method for the oxidation of o-xylene to phthalide, comprising reacting o-xylene with an oxidant in the presence of a catalyst, wherein the catalyst comprises at least two transition metal ions and carbon nanotubes. The method for the oxidation of o-xylene to phthalide provided by this invention utilizes a composite catalyst of at least two transition metal ions and carbon nanotubes, effectively improving the selectivity of phthalide.

The invention relates to the field of engineering plastics, in particular to a low-precipitation high-toughness glass fiber reinforced PBT (polybutylene terephthalate) composite material and a preparation method thereof. The PBT composite material comprises the following components in percentage by mass: 80.00 to 85.00 percent of polybutylene terephthalate resin; 12.00% to 18.00% of reinforcing fibers; 1.00% to 3.00% of a precipitation-resistant silicon-based modifier; 0.10% to 0.20% of an antioxidant; 0.10% to 0.20% of a lubricant; wherein the precipitation-resistant silicon-based modifier is prepared by pretreating diatomite with a silicon hydroxyl activating treatment agent and then carrying out surface grafting reaction on the pretreated diatomite and an epoxy-based interface compatilizer; the precipitation amount of the composite material after being refluxed in o-xylene for 24 hours is lower than 0.65%, and the notch impact strength is not lower than 4.35 KJ / m < 2 >. The diatomite is subjected to surface grafting modification, so that the precipitation amount of the PBT composite material is lower than 0.65%, the impact strength is still kept to be higher than 4.50 KJ / m < 2 >, and the refrigerant resistance and the toughness are synergistically improved.

The application belongs to the technical field of high polymer materials, and particularly relates to a synthesis process of 2,3,6,7-naphthalene tetracarboxylic dianhydride. The steps are as follows: alpha,alpha,alpha',alpha',4,5-hexabromo-o-xylene is reacted with 2-(triphenylphosphoranyl) butanedioic acid dialkyl ester in an organic solvent in the presence of an acid-binding agent to obtain 6,7-dibromo-2,3-naphthalene dicarboxylate; the 6,7-dibromo-2,3-naphthalene dicarboxylate is reacted with a cyanation reagent to obtain 6,7-dicyano-2,3-naphthalene dicarboxylate; the 6,7-dicyano-2,3-naphthalene dicarboxylate is hydrolyzed in an alkaline aqueous solution, and after the reaction is completed, acidification is performed to obtain 2,3,6,7-naphthalene tetracarboxylic acid; and the 2,3,6,7-naphthalene tetracarboxylic acid is dehydrated in an acid anhydride environment to obtain 2,3,6,7-naphthalene tetracarboxylate dianhydride. The application has the advantages that raw and auxiliary materials are easy to obtain and low in cost, is suitable for mass industrial production, the synthesis process avoids harsh environments such as high temperature and high pressure, the conversion rate is high, the product quality is stable, and high-purity products can be obtained.

The invention relates to the field of chemical equipment, in particular to a device and method for preparing phthalic anhydride from mixed raw materials of o-xylene and naphthalene, and the device comprises an air compressor, an o-xylene storage tank, a naphthalene storage unit, an oxidation reactor and a crude product storage tank, the naphthalene storage unit comprises a naphthalene storage tank and a support arranged on the periphery of the naphthalene storage tank, a ton bag can be placed between the naphthalene storage tank and the support, a first lifting rope and a second lifting rope are installed on the ton bag, the first lifting rope is led out from the four top corners of the upper surface of the ton bag, and the second lifting rope is led out from the two top corners of the lower surface of the ton bag. A first crane and a second crane are arranged on the support, an opening is formed in the top of the naphthalene storage tank, a feeding unit is installed on the opening and comprises a feeding hopper, a cutting device is arranged on one side wall in the feeding hopper, and the cutting device can cut the side wall, making contact with the cutting device, of a ton bag. The naphthalene storage unit provided by the invention provides a convenient scheme for unloading flaky naphthalene packaged by ton bags. The preparation method provided by the invention is high in raw material conversion rate and good in selectivity.

The present application relates to the technical field of liquid phase adsorption separation, and discloses a method for separating and purifying target components from raw materials and application thereof, and a method for separating and purifying p-xylene and / or o-xylene from a C8 aromatic hydrocarbon mixture, which comprises: injecting raw materials F, a weak desorbent D1 and a strong desorbent D2 into a liquid phase simulated moving bed respectively, performing adsorption separation, and taking out extract E containing target components and raffinate R; the liquid phase simulated moving bed comprises n adsorbent layers, and the weak desorbent D1 is injected into the liquid phase simulated moving bed from any layer between the injection point of the strong desorbent D2 and the raffinate R taking-out point along the circulating material flow direction in the simulated moving bed; wherein, the relative selectivity coefficient of the strong desorbent D2 is greater than 1 and the relative selectivity coefficient of the weak desorbent D1 is less than 1 with respect to the target components. The method can improve the separation efficiency of separating and purifying target components from raw materials.

The application of gamma-valerolactone and / or o-xylene in luring Myzus persicae, Frankliniella intonsa and Coccinella septempunctata belongs to the technical field of pest luring. The application of gamma-valerolactone and / or o-xylene in luring Myzus persicae, Frankliniella intonsa and Coccinella septempunctata is proposed for the first time, and based on the new application, the application of gamma-valerolactone and / or o-xylene in preparing a pest luring agent, a kind of pest luring agent with active ingredients including gamma-valerolactone and / or o-xylene and a kind of device for luring pests are further provided. Gamma-valerolactone and / or o-xylene can effectively lure Myzus persicae, Frankliniella intonsa and Coccinella septempunctata, and the response rate of various pests to gamma-valerolactone and / or o-xylene is above 90%.