2621results about "Catalytic reactions" patented technology

The invention discloses a p-methyl benzyl chloride production process and a production system thereof, p-xylene side chains and chlorine are subjected to a gas phase substitution reaction under micro negative pressure and visible light catalysis to generate crude methyl benzyl chloride and hydrogen chloride, and 99.0% methyl benzyl chloride, a small amount of benzyl dichloride and 31% hydrochloric acid are respectively generated through rectification and absorption; the device consists of four working sections of chlorination, rectification, hydrochloric acid absorption and distillation. According to the method, the defects in the prior art are overcome, on one hand, chlorine is introduced, and an aromatic ring chlorination reaction is carried out under visible light catalysis; on one hand, a supported catalyst filler is arranged at the bottom of a chlorination tower, and a zeolite molecular sieve modified by long-chain alkylsilane and supported by metal salt is used as a catalyst to catalyze chloromethylation reaction, on the other hand, the hydrophobicity of the modified catalyst is obviously enhanced, and meanwhile, the density of acidic sites is not reduced; the contact opportunity of the catalyst and a reaction substrate is greatly increased, and the catalytic efficiency of the catalyst is improved.

Disclosed herein is a catalytic comprising a hexacyano metal compound; wherein the hexacyano metal compound comprises a metal selected from the group consisting of cobalt, iron, copper, manganese, nickel, zinc, and combinations thereof; wherein the hexacyano metal compound comprises coordinatively unsaturated metal (II)—N—C centers for; and wherein the hexacyano metal compound is anchored onto an inorganic substrate. Also disclosed are a system including the catalytic material and a process for treating wastewater using the catalytic material.

Process for making sustainable aviation fuel (SAF) from specific bio-ethylene oligomerization reactions producing a C4-C8 alpha-olefin and a by-product mixture of C10 olefins. This mixed decene stream is upgraded by further oligomerizing with at least one C4-C6 alpha-olefin to provide a C16− olefin stream, which is hydrogenated to C16− paraffins which is used to form a SAF. Employing bio-ethylene to produce the mixed decene stream, which is relatively low-value due in part to its non-selectivity, leverages that non-selectivity into a desirable sustainable aviation fuel product where the low selectivity is preferable. These and other embodiments and aspects are described herein.

The preparation method comprises the following steps: mixing 20-40 parts by mass of substituted hydroxymethyl glycoluril, 45-85 parts by mass of mercaptocarboxylic acid and 0.5-3 parts by mass of an acidic catalyst, stirring and reacting for 1-10 hours at the temperature of 50-150 DEG C under the pressure condition of-0.01 to-0.1 MPa, adding 300-800 parts by mass of an organic solvent for diluting after the reaction is finished, washing and purifying with deionized water, and collecting an organic layer, thereby obtaining the mercaptan curing agent. Concentrating and drying to obtain the mercaptan curing agent. According to the thiol curing agent, the rigid glycoluril group is introduced, so that the rigidity of a cured product structure is improved, and the mechanical property, the adhesive property, the heat resistance and the damp-heat aging resistance of a cured product are improved; four tertiary amine groups in the substituted glycoluril have a certain self-promotion effect on a thiol curing epoxy reaction, and the curing reaction temperature is reduced under the condition that an accelerant is not added; the glycoluril-containing thiol epoxy resin curing agent disclosed by the invention has good application value and development prospect.

A method of fixating carbon dioxide to a substituted cyclic carbonate includes a reaction of an epoxide and carbon dioxide in the presence of a zirconium-containing metal-organic framework to form the substituted cyclic carbonate. The zirconium-containing metal-organic framework is a UiO-66-based metal-organic framework including an aminomethylbenzoic acid. The zirconium-containing metal-organic framework catalyzes the formation of the substituted cyclic carbonate in a range of 40 to 97 percent yield.

The invention discloses an immobilized organic base catalyst and a preparation method and application thereof, the immobilized organic base catalyst comprises functionalized activated carbon, the functionalized activated carbon has a Bronsted base site comprising an organic Bronsted base molecular structure, the organic Bronsted alkali molecular structure is connected to the surface of the functionalized activated carbon through a covalent bond. The immobilized organic base catalyst is a heterogeneous active carbon-based immobilized organic # imgabs0 # base catalyst, and has the advantages of low preparation cost, high reaction activity, good stability and the like.

The invention provides a thioether oxidation catalyst, a preparation method thereof and a preparation method of pyroxasulfone. The preparation method comprises the following steps: S1, preparing a selenium source and a first solvent into a first solution; s2, adding a Lewis acid source into the first solution, and performing first mixing to obtain a second solution; s3, adding an organic alkali ligand source into the second solution, and performing second mixing to obtain a third solution; and S4, carrying out solvothermal reaction on the third solution at 100-150 DEG C to obtain the thioether oxidation catalyst. A selenium source, a Lewis acid source and an organic alkali ligand source are subjected to a combined reaction according to a specific sequence and conditions, and finally the inorganic-organic hybrid selenite catalyst with a special structure is formed under a solvothermal condition. The obtained catalyst is high in active atom utilization rate and strong in reactant molecule adsorbability, is beneficial to deep oxidation of reactants, accelerates oxidation of thioether into sulfone, and improves reaction selectivity and production efficiency.

A method for preparing a benzofuran derivative. Specifically, the present invention relates to a method for preparing a benzofuran derivative represented by formula L The preparation method greatly improves yield and has good application prospects.

The invention provides a separation method of a catalyst for preparing butyraldehyde through propylene carbonylation, and relates to the technical field of chemical synthesis. The separation method comprises the following steps: carrying out flash evaporation separation and low-pressure evaporator evaporation on a material obtained by carrying out a propylene carbonylation reaction on propylene and synthesis gas as raw materials, obtaining a gas-phase material from a collecting tank of a low-pressure evaporator, and outputting a liquid-phase catalyst solution; the gas-phase material is subjected to condensation and gas-liquid separation, crude butyraldehyde is output, and obtained non-condensable gas returns to a liquid distribution chamber of the low-pressure evaporator; wherein the catalyst is acetylacetone triphenyl phosphorus silicification carbonyl rhodium, and the operation temperature of the low-pressure evaporator is 85-95 DEG C. By controlling the circulating air volume and the evaporation temperature, high-temperature deactivation of the catalyst is prevented, the service life of the catalyst is prolonged, and the process cost is reduced; the process flow is simplified, and the method is suitable for large-scale process production.

The invention provides a novel chiral ferrocene bridged binaphthyl skeleton phosphine ligand and application thereof. The ligand has the advantages of low cost, simplicity in synthesis, air stability and the like. The ligands have good catalytic activity and enantioselectivity in the asymmetric hydrogenation reaction of ketone, and have certain industrial application prospects in the synthesis of pharmaceutical molecules.

[Problem] To provide a complex compound useful as a catalyst for a hydrophosphorylation reaction and a process for producing the same.[Means to Solve the Problem] A complex compound of the present invention is a complex compound of a resin fine particle represented by the following general formula (1):wherein, R1 represents a substituted or unsubstituted hydrocarbon group, R2 represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, R3 and R4 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, and based on the total of 100% of the values of n and m, the value of n is within the range of 20 to 100%, the value of m is within the range of 0 to 80%, and * represents bonding with the surface of the resin fine particle and a transition metal.

The invention relates to the technical field of silicon dioxide surface modification, in particular to a silicon dioxide hollow sphere with an MOF composite layer, a manufacturing method and a dielectric loss prediction method. The silicon dioxide hollow sphere comprises a hollow spherical structure formed by silicon dioxide, an amino silane layer grafted on the surface of an inner core layer through a covalent bond, a ZIF-8 crystal layer growing in situ by taking amino as a nucleation site, and thiol groups distributed on the outer surface of an MOF crystal. According to the silicon dioxide hollow sphere with the MOF composite layer, the manufacturing method and the dielectric loss prediction method, the silicon dioxide hollow sphere with the MOF composite layer has good compatibility and stability in an LCP matrix, the dielectric loss is small, and the performance of a high-frequency FPC is effectively improved.

The invention relates to the technical field of organic synthesis, in particular to a method for homogeneous catalytic synthesis of dimethyl carbonate by using a liquid separation method to separate a catalyst, which comprises the following steps: by using 0.3-15% long-chain tertiary amine as a homogeneous catalyst, carrying out homogeneous reaction on cyclic carbonate and methanol in a mass ratio of 1: (1.2-5.5) at 60-80 DEG C for 4-7 hours. And after the homogeneous transesterification reaction is completed, carrying out atmospheric distillation on the reaction mixture, and collecting fractions to obtain the target product dimethyl carbonate. Carrying out liquid separation on the heterogeneous atmospheric distillation residual liquid, and collecting a lower-layer material to obtain a by-product; and the collected material is a catalyst which can be directly recycled subsequently. The dimethyl carbonate synthesis method provided by the invention has the characteristics of high catalytic efficiency, easy catalyst separation, environmental protection, energy saving and the like.

The invention belongs to the field of fine chemical engineering, and particularly relates to an N-heterocyclic carbene complex catalyst and application of the N-heterocyclic carbene complex catalyst in pipelined continuous synthesis of a silane coupling agent. The invention provides an N-heterocyclic carbene complex catalyst, which comprises a ligand and an active component, the ligand is an N-heterocyclic carbene ligand, and the active component is a transition metal; the molar ratio of the N-heterocyclic carbene ligand to the transition metal is 1: 1. The invention also provides a method for pipelined continuous synthesis of the silane coupling agent, which comprises the following steps: carrying out homogeneous hydrosilylation reaction in a pipelined reactor by taking hydrogen-containing silane and unsaturated hydrocarbon as raw materials in the presence of an N-heterocyclic carbene complex catalyst to obtain the silane coupling agent. The spatial configuration and the electronic property of the N-heterocyclic carbene ligand precursor are designed and regulated, so that the N-heterocyclic carbene ligand precursor is matched with transition metal, and the N-heterocyclic carbene ligand precursor can be applied to hydrosilylation reaction.

This invention relates to a method for using a low-content ruthenium-based catalyst modified with nitrogen and oxygen ligands in the hydrochlorination of acetylene. The invention utilizes 2-pyridine carboxylate as a ligand, commercial activated carbon as a support, trace amounts of ruthenium as the main active component, and water as a solvent. An improved synthesis procedure yields a low-content ruthenium-based catalyst with ruthenium ions coordinated by a modifier and commercial activated carbon as a support, significantly improving catalyst performance while reducing ruthenium content. This catalyst exhibits high activity and vinyl chloride selectivity in the fixed-bed hydrochlorination of acetylene to vinyl chloride, and its low cost makes it highly valuable for industrial applications. The ruthenium loading is 0.1%, and the reaction gas space velocity is 170 h⁻¹. ‑1 V (C2H2) / V (HCl) With a ratio of 1:1.05 and a reaction temperature of 180℃, the acetylene conversion rate can reach 84.3%, the vinyl chloride selectivity is greater than 99%, and the activity remains basically unchanged within 10 hours.

The invention relates to the technical field of heterogeneous catalysis and fine chemical engineering, and discloses a rhodium-tungsten para-site MOF-based catalyst as well as preparation and application thereof. The invention relates to a rhodium-tungsten para-site MOF-based catalyst, which is composed of a catalytic active component, a metal additive and a carrier. The rhodium-tungsten para-site MOF-based catalyst provided by the invention takes a metal organic framework material as a carrier, an active component Rh and a metal additive W are stably anchored on the surface of the carrier, and an Rh-WOx para-site is successfully constructed; the rhodium-tungsten para-site MOF-based catalyst provided by the invention shows excellent catalytic activity and excellent cycle stability in olefin hydroformylation reaction, and overcomes the technical bottlenecks that noble metals in a homogeneous catalysis system are easy to lose and energy consumption is high in a product separation process; an efficient and stable catalyst design thought is provided for olefin hydroformylation reaction, and the catalyst has a good industrial application prospect.

The invention discloses a five-membered ring P-chiral phosphine oxide compound containing alkynyl or triazole functional groups, which is characterized in that under the protection of inert gas, a prochiral tertiary phosphine oxide compound containing dialkenyl and phenylacetylene are used as raw materials, in the presence of a transition metal palladium catalyst and a chiral TADDOL phosphoramidite ligand, Domino Heck-Sonogashira cascade reaction is carried out to obtain the P-chiral phosphine oxide compound, and the P-chiral phosphine oxide compound is used as a raw material for preparing the five-membered ring P-chiral phosphine oxide compound containing alkynyl or triazole functional groups. The yield of the obtained product is up to 96%, the enantioselectivity ee value is up to 99%, and the diastereoselectivity dr value is greater than 20: 1. According to the present invention, the asymmetric desymmetry strategy is adopted, the Heck reaction is adopted to start the cascade reaction, the Sonogashira reaction is adopted to terminate the cascade reaction, the P-chiral center and the quaternary carbon chiral center are simultaneously constructed, the reaction conditions are mild, the operation is simple, the substrate universality is good, the diversified compound skeleton is provided, and the chiral ligand is successfully used as the chiral ligand to be used in the palladium-catalyzed asymmetric allyl substitution reaction.

Captured carbon dioxide is converted into ultra-high purity hydrocarbons, particularly methane. A gas stream containing carbon dioxide is fed to a reactor containing both sorbent and catalyst, until the sorbent portions are substantially saturated with carbon dioxide; non-sorbed species are removed from the first reactor via vacuum and / or purge cycles with high-purity gas; hydrogen gas is introduced to the first reactor to a pressure above ambient; reactor temperature is raised to facilitate desorption of carbon dioxide; and the carbon dioxide is catalytically transformed with the hydrogen gas into methane by recirculating the gas through the reactor. Carbon dioxide adsorption and desorption occur within the sorbent portions, while methanation takes place on the catalytic portions assisted by the sorbent at a temperature substantially consistent with the desorption. Downstream upgrading steps may remove or reduce impurities to produce ultra-high purity methane for chemical vapor deposition or other processes.

The invention discloses a method for preparing a chiral furanone ester derivative, which comprises the following steps: adding a metal catalyst into a solvent, sequentially adding a carboxylic acid compound I or a carboxylic acid compound II and a butene lactone compound III, introducing inert gas, stirring, post-treating and purifying to obtain a chiral furanone ester compound IV; the palladium catalysis system is composed of palladium salt and a chiral ligand V, and the chiral ligand has a structure shown in a formula V.

The present invention relates to the technical field of ethylene oligomerization catalysts, and discloses a ligand compound, a selective ethylene oligomerization catalytic composition and application thereof, and a selective ethylene oligomerization reaction method, the ligand compound has a structure represented by a formula (1) # imgabs0 #, Ar and Ar'are independently selected from substituted or unsubstituted aryl or heteroaryl; 1, 2-positions are substituted or unsubstituted cyclic substituents. The ligand compound is applied to a selective ethylene oligomerization catalytic composition, high ethylene trimerization and tetramerization catalytic activity can be obtained, hexene-1 and octylene-1 selectivity is high, the high-molecular polymer content is low, the risk of scaling and blocking of a reaction pipeline in a continuous reaction can be greatly reduced, and the selectivity of ethylene oligomerization is high. Good industrial application prospects and economic values are realized.

Described are new processes for making sustainable jet fuels and components thereof, based upon generating bio-ethylene by dehydration of biomass ethanol or a bio-syngas ethanol, and subsequently employing a tailored selection of oligomerization, cyclization, and hydrogenation reactions to generate each class of compounds which can be used as components in a sustainable aviation fuel. For example bio-ethylene oligomerization can provide olefin oligomers which can be hydrogenated to linear and branched paraffins, these paraffins can be cyclized to form bio-sourced aromatic compounds which subsequently can be hydrogenated to form cycloparaffins or naphthenes. These compounds can be blended to provide sustainable products in the kerosene jet fuel range (C8-C16) or wide-cut jet fuel range (C5-C15 or C4-C16).

The invention provides a modified copper-based metal organic framework material, a preparation method thereof and application of the modified copper-based metal organic framework material in catalyzing cyclohexanone oxidation rearrangement to prepare epsilon-caprolactone, and belongs to the technical field of material preparation and chemical engineering. A crystallization method and a post-synthesis modification method are combined, a halogen atom (Cl, Br or I) is used for replacing a hydrogen atom of a meta-position carbon-hydrogen bond of a benzene ring in a trimesic acid ligand, and the halogen modified copper-based metal organic framework material is prepared and applied to catalysis of a Baeyer-Villiger oxidation rearrangement reaction of cyclohexanone under an oxygen-benzaldehyde system to prepare epsilon-caprolactone. The catalyst is simple in preparation condition, high in catalytic activity, excellent in cycling stability, high in caprolactone selectivity in reaction and high in utilization rate of sacrificial agent benzaldehyde.

The present invention provides a system, a process and a method of storing hydrogen (H2) and releasing it on demand, comprising and making use of N-heterocycles as liquid organic hydrogen carriers (LOHCs).

The invention relates to a pyrazinyl covalent organic framework material as well as a preparation method and application thereof, 2, 5-dimethylpyrazine and aromatic aldehyde monomers are taken as construction elements, and the pyrazinyl covalent organic framework material connected with two olefins is synthesized through a Knoevenagel reaction. The pyrazinyl covalent organic framework material disclosed by the invention has good chemical stability and full-conjugate skeleton characteristics, shows excellent photocatalytic activity and cycling stability in visible light driven thioether oxidation reaction, and has potential application value in the fields of environmental restoration and green chemistry.

The present invention provides a method for preparing an organostannane compound catalyzed by diethylzinc, belonging to the technical field of preparing stannane compounds. The method can solve the problems urgently needed to be solved in the preparation method of such stannane compounds. The method comprises: mixing an acetylene compound, a tin hydrogen compound, and a diethylzinc catalyst under an inert atmosphere; reacting the reaction system at 60 to 70°C for 18 to 24 hours, then exposing the reaction system to air to terminate the reaction, and purifying the organostannane compound by column chromatography, wherein the inert atmosphere is nitrogen. The stannane compound is a vinyl stannane compound or an ethynyl stannane compound, and the acetylene compound is an aliphatic acetylene compound or an aromatic acetylene compound. The present invention solves the problems urgently needed to be solved in the preparation method of such organostannane compounds, such as the high cost of the catalyst used, the environmentally unfriendly nature of the catalyst, and the complex operation process.

The present disclosure relates to a procedure for the synthesis of polymers (homo and copolymers) of the poly (ionic liquid) (PIL) type. The homopolymers are derived from polyvinylimidazolium, polyvinylpyrrolidone or polyvinylpyridine and the copolymers from monomers of vinyl ionic liquids (ILs) are derived from imidazole and N-vinylpyrrolidone. The structural modification of these homopolymers and copolymers occurs by using strong inorganic acids such as sulfuric, chlorosulfonic and bromosulfonic, among others, and halide metallic salts such as AlCl3, FeCl3, CuCl, ZnCl2, and SnCl2. Also, these PILs are employed as catalysts in alkylation reactions between isoparaffins and olefins for producing alkylate gasoline.

Provided are industrial processes for producing an organic acid alky ester from a feedstock containing organic acids and / or saponifiables, comprising: countercurrently contacting a feedstock with an organic alkylating reagent over two or more vessels or stages at temperature between 100° C. and 400° C. and pressure between 0.1 barg and 355 barg while simultaneously removing water and / or glycerin with unreacted alkylating reagent from the final vessel or stage to result in a first reaction method product containing organic acid alkyl esters, followed by a choice of using the alkyl esters as-is, purifying the organic acid alkyl esters from the first reaction product mixture or subjecting the first reaction product mixture to an additional transesterification reaction to convert saponifiables into additional organic acid alkyl esters, then purifying the organic acid alkyl esters from this second reaction method product.

The invention provides a copper-nickel diatom modified indium-based catalyst and a preparation method thereof, and a method for catalyzing coal bed gas oxidation to prepare methanol. The catalyst is a copper-nickel diatom site loaded indium oxide nanotube, a carrier of the catalyst is the indium oxide nanotube, and an active source is a copper-nickel diatom site constructed by a specific photodeposition sequence. According to the method, methane in the coal bed gas can be converted into methanol, compared with the prior art, the methanol yield is higher, effective utilization of clean energy can be achieved, and the method has good application prospects.

The invention relates to the technical field of chemical synthesis, and discloses a method for preparing short-chain diacid by catalytic oxidation of polyethylene with an ionic liquid, which comprises the following steps: mixing the ionic liquid and polyethylene, and mixing for oxidation reaction in the presence of nitric oxide and oxygen to obtain the short-chain diacid. According to the method, the polyethylene is adopted as the raw material for the first time, the ionic liquid is used as the reaction catalyst and the reaction medium, nitric oxide is catalyzed to generate nitrogen dioxide, efficient catalytic oxidation of the polyethylene is achieved, the short-chain diacid product with the carbon number of 4-12 is obtained, the highest yield reaches 90% or above, and the influence on the yield is not large when the polyethylene recycled material is adopted. The method not only solves the problem of polyethylene waste recovery, but also solves the problem of high preparation cost of short-chain diacid, so that the preparation cost is greatly reduced.