6 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.

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 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 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 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.