12 results about "Aromatic ketones" patented technology

The present application relates to a kind of preparation method of substituted alkylbenzene.The method includes: substituted aromatic ketone flows through catalyst bed and is reacted, the catalyst bed includes: hydrogenation catalytic bed and intramolecular dehydration catalytic bed of alternative arrangement, and the first section and the last section of the catalyst bed are hydrogenation catalytic bed;The reaction is carried out in the presence of non-alcohol solvent.The present application is in the presence of non-alcohol solvent, using substituted aromatic ketone is synthesized in the catalyst bed with hydrogenation catalytic bed and intramolecular dehydration catalytic bed of alternative arrangement, and the first section and the last section of the catalyst bed are hydrogenation catalytic bed, substituted alkylbenzene, with the advantages of high reactant conversion, high selectivity of product substituted aromatic ketone, simple post-processing.

The invention belongs to the technical field of organic synthetic chemistry, and discloses a preparation method of an aromatic ketone compound, which comprises the following steps: by taking an unsaturated carbonyl compound obtained by condensing aryl acetaldehyde / acid and aldehyde / ketone molecules as a precursor, carrying out a reaction on the unsaturated carbonyl compound in the presence of a free radical precursor and molecular oxygen under the conditions of illumination and / or heating to obtain the aromatic ketone compound. And carrying out free radical mediated decarbonylation functionalization reaction in an organic solvent to obtain the aromatic ketone compound. The functional group contained in the free radical precursor is introduced to the alpha position of the ketone compound. By improving reaction participants and a reaction mechanism, the aromatic ketone compounds with various structures can be efficiently and highly selectively constructed in one step, the functionalization of the alpha position of the aromatic ketone compounds is synchronously realized, and the preparation method which is simple and convenient to operate, high in atom economy, green and environment-friendly is provided for the aromatic ketone compounds; the obtained compound is especially applicable to the fields of drug synthesis and synthesis of other materials.

This invention relates to the field of high-performance thermoplastic composite materials, and in particular to a method for preparing polyaryletherketone resin. The method includes the following steps: under a non-oxidizing atmosphere, a dihydroxy aromatic monomer containing a bisphenol structure, a dihalogenated aromatic monomer containing a nitrile group, and a dihalogenated aromatic ketone monomer containing a difluorine substituted group are reacted in a polar solvent system with a boiling point above 150°C in the presence of an alkali metal carbonate to form the corresponding phenolate; an aromatic hydrocarbon dehydrating agent is added to the system for azeotropic dehydration to remove water generated during the reaction and promote the formation of the phenolate; a nucleophilic substitution polycondensation reaction is carried out at a higher temperature; during the polycondensation reaction, a capping agent is added to regulate the end-chain structure and molecular weight distribution, wherein the capping agent is 2,4′-difluorobenzophenone; after the reaction is completed, the reaction product is separated and purified to obtain the polyaryletherketone resin.

This invention discloses a nickel oxide-doped manganese dioxide catalyst, its preparation method, and its application. The catalyst is prepared by in-situ growth of nickel oxide-doped manganese dioxide on a carbon felt substrate using a solvothermal method. In the application, the catalyst electrode is used as the anode, and an aromatic compound is dissolved in an acidic solution as the anolyte. A counter electrode is used in the cathode chamber, and an acidic solution is used as the cathode reaction solution. After the reaction, an aromatic aldehyde or aromatic ketone can be obtained through a post-treatment process. The catalyst of this invention has a high surface area and porous structure, which increases the specific surface area of ​​the electrode, providing a large number of reaction sites and active sites for the oxidation of the substrate. In addition, the doping of nickel oxide provides more active sites for manganese dioxide, promoting the formation of intermediates and also promoting the desorption of the aromatic aldehyde product, preventing the formation of aromatic acids due to over-oxidation. Furthermore, the nanorod-like three-dimensional structure of the catalyst is beneficial for mass transfer.

A method for producing an aromatic ketone represented by formula (1), said method comprising a reaction step in which a compound represented by formula (2) is reacted in the presence of a sulfonic acid to obtain the aromatic ketone, wherein the sulfonic acid includes at least one sulfonic acid selected from the group consisting of C1-3 alkyl sulfonic acids and C1-3 fluoroalkyl sulfonic acids. (In formulas (1) and (2), R1 and R2 each independently represent a C1-6 hydrocarbon group.)

This invention belongs to the field of acidizing technology in oil and gas field development, and discloses a Mannich base quaternary ammonium salt corrosion inhibitor for ultra-high temperature well acidizing and its preparation method. The corrosion inhibitor is composed of 35%~55% by mass of a novel Mannich base quaternary ammonium salt, 30%~60% by mass of an organic solvent, and 5%~15% by mass of a corrosion inhibitor synergist. The novel Mannich base quaternary ammonium salt has a specific molecular structure and is synthesized by reacting modified aromatic aldehydes, aromatic ketones, and organic secondary amines. Its molecular skeleton incorporates rigid groups and long-chain hydrophobic groups, which can form a dense adsorption film on the metal surface and significantly improve thermal stability. The corrosion inhibitor of this invention exhibits excellent corrosion inhibition performance in an ultra-high temperature acidic environment of 200℃, solving the problems of easy decomposition and non-dense adsorption film of existing corrosion inhibitors at high temperatures.

The invention discloses a method for synthesizing Schiff base 2-aniline by using calcium carbide as a mediator, which is characterized in that aromatic ketone is used as an initial raw material and is synthesized through two-step reaction: firstly, the aromatic ketone reacts with p-methyl benzenesulfonyl hydrazide to synthesize aromatic ketone p-methyl benzenesulfonyl hydrazone, and the aromatic ketone p-methyl benzenesulfonyl hydrazone reacts with p-methyl benzenesulfonyl hydrazone to synthesize Schiff base 2-aniline; and secondly, reacting the aromatic ketone p-toluenesulfonyl hydrazone with p-phenylenediamine, sodium tert-butoxide, calcium carbide and maleic anhydride to synthesize the Schiff base 2-aniline. According to the new method for synthesizing the 2-((1-arylethyl) amino) aniline Schiff base by taking calcium carbide (calcium carbide) as a key mediating agent, the purposes of low cost, high yield, simplicity and convenience in operation and good functional group tolerance are achieved.

The application discloses a method for producing ethylene cracking raw material by hydrocracking. The method is a one-stage series hydrocracking process, which comprises the following steps: a hydrocracking reactor is fed with a hydrocracking feedstock in an upward feeding mode, a material P is introduced into the hydrocracking reactor between a hydrocracking catalyst bed and a post-hydrorefining catalyst bed, the product obtained from the hydrocracking reactor is first subjected to air cooling, the material P in the product is taken out of the reaction system by water phase through the method of water injection in the air cooling device, the oil phase after air cooling is separated and fractionated to obtain light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil fraction, and the tail oil fraction is used as the raw material for producing ethylene by steam cracking; the material P is one or more of C23-C35 phenols, aromatic alcohols, aromatic aldehydes, aromatic ketones and aromatic esters. The method can improve the quality of the tail oil product under the condition of producing the tail oil in the hydrocracking device, so as to prolong the operation cycle of the ethylene cracking furnace.

The application discloses a hydrocracking method for improving color stability of special oil. The method is a one-stage series hydrocracking process, wherein a hydrocracking catalyst bed and a post hydrofining catalyst bed are arranged in sequence along the liquid phase material flow direction in a hydrocracking reactor, and the method comprises the following steps: a wax oil raw material is sequentially introduced into a hydrofining reactor and a hydrocracking reactor, and the obtained product is separated and fractionated to obtain an industrial white oil fraction; wherein, a material P is introduced between the hydrocracking catalyst bed and the post hydrofining catalyst bed, the material P is one or more of C17-C22 phenols, aromatic alcohols, aromatic aldehydes, aromatic ketones and aromatic esters; an air cooling device is arranged before fractionation of the obtained product, wherein the air cooling device is water injected so that the material P in the product is taken out of the reaction system by the water phase. The method can improve the color stability of the special oil under the condition that the hydrocracking device is mainly used for producing the special oil.

The application discloses a method for selective oxidation of aromatic compounds to aromatic ketones. Oxygen is used as an oxidant to achieve selective synthesis of aromatic compounds to corresponding ketones in a heterogeneous catalytic system. The catalytic process utilizes the synergistic catalysis of two catalysts on the reaction, and realizes rapid oxidation of aromatic compounds without the need of alkaline additives. The product distribution obtained by the method is simple and easy to separate, reduces environmental pollution, and is a green production process, which has important practical application value for promoting sustainable development.

The application provides an application of a strain of Tolypocladium inflatum ZJPH2105 in preparing a chiral aromatic alcohol through asymmetric reduction of an aromatic ketone. The product obtained through catalysis of the strain of Tolypocladium inflatum ZJPH2105 has an e.e. value of greater than 99.9%, the strain is green and safe, easy to cultivate, and rich in source, and the conversion process does not need to add expensive coenzyme, and has the characteristics of low cost, green and environment-friendly conversion process and the like. The application uses the strain of Tolypocladium inflatum ZJPH2105 as a biological catalyst to reduce 4'-bromo-2,2,2-trifluoroacetophenone, when the substrate concentration is 10 mM, the yield of the target product (S)-1-(4-bromophenyl)-2,2,2-trifluoroethanol can reach 98.2%, and the e.e. value is greater than 99.9%.

Disclosed in the present invention is a method for synthesizing an unsaturated ketone or aromatic ketone compound. The method comprises: at a certain temperature, by using an unsaturated hydrocarbon or aromatic hydrocarbon as a starting material and a N-hydroxyimide compound as a catalyst, adding an organic solvent to dissolve same, then introducing oxygen or air into the reaction solution under light irradiation to carry out an oxidation reaction, and performing workup and separation to obtain the unsaturated ketone or aromatic ketone. The method of the present invention uses air, oxygen-enriched gas or oxygen as a harmless oxidant and light as an energy source to promote the reaction, and therefore has the advantages that the reaction process is green and efficient and low-cost, the usage amount of the catalyst is small, and most of the catalyst is recyclable. In addition, the method of the present invention does not require the participation of reagents such as heavy metals, photocatalysts and hypervalent iodine oxidants and thus has high atomic economy.