1962results about "Catalytic reactions" patented technology

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.

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 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.

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.

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.

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 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.

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 catalysis, in particular to a green preparation process for synthesizing 4 '-chloro-2-aminobiphenyl through a membrane method.A palladium-based catalytic membrane is prepared through an impregnation method, by means of the multi-pore-channel advantage of a ceramic membrane, active components can be well distributed on the surface and in the membrane, contact of a reaction substrate and active sites is promoted, and the catalytic activity of 4'-chloro-2-aminobiphenyl is improved. The reaction effect is enhanced, the reaction efficiency is improved, the preparation process is simple, the preparation environment is mild, and large-scale production can be realized; meanwhile, the 4 '-chloro-2-aminobiphenyl is prepared by adopting a method for carrying out Suzuki-Miyaura coupling reaction by adopting the catalytic membrane, tedious steps in the traditional industry are omitted, compared with a traditional heterogeneous catalyst, the trouble of recovery is avoided, the cost is saved, the harm to the environment is greatly reduced, and compared with the prior art, the 4'-chloro-2-aminobiphenyl has a wide application prospect.

Disclosed herein are a catalyst for polyester depolymerization or cyclic ester synthesis, a preparation method therefor and a use thereof. The catalyst is a long-chain catalyst having a main chain carbon atom number greater than or equal to 8, and containing a terminal ion group and a terminal hydroxyl structure; the catalyst may be used to catalyze polyester hydrolysis, alcoholysis or cyclic depolymerization, so as to recover corresponding monomers or monomers and oligomers, or used to catalyze hydroxy acid or hydroxy acid esters to synthesize cyclic ester monomers or cyclic ester monomers and cyclic oligomers by means of polycondensation and cyclization reactions. The catalyst may reduce the viscosity of a reaction system, and may greatly improve the utilization rate of a catalytic active center, reduce the consumption of the catalyst and improve overall catalytic efficiency, achieving high-efficiency, high-yield and selective depolymerization of polyester homopolymers, copolymers, blends or compounds.

The invention relates to an olefin hydroformylation homogeneous catalysis continuous reaction process and system. The process comprises the following steps: mixing raw materials olefin, synthesis gas and a metal catalyst, and then carrying out hydroformylation reaction; removing a light component containing the product aldehyde from the hydroformylation reaction liquid to obtain a heavy component containing the metal catalyst; uniformly mixing the heavy component with a first extraction agent, and performing phase splitting to obtain a first heavy component phase and a first extraction agent phase; a metal catalyst and a second extraction agent are separated from the first extraction agent phase, the metal catalyst is circularly used for the hydroformylation reaction, and the second extraction agent is used as the first extraction agent mixed with the heavy components. Based on the characteristics of solubility difference and specific gravity difference between the metal catalyst and other substances in the heavy components under specific conditions, the heavy components in a reaction system are reacted at a lower temperature on the premise of not additionally adding a reagent which can influence the activity of the catalyst, and the activity of the catalyst can be well maintained within a longer reaction time.

A method of carbon dioxide fixation includes contacting a covalent organic framework material with a co-catalyst and an epoxide in the presence of carbon dioxide to form a cyclic carbonate. The covalent organic framework material includes reacted units of a 2,4,6-trimethyl-1,3,5-triazine, reacted units of a 4,4′-biphenyldicarbaldehyde, and palladium nanoparticles. The reacted units of the 2,4,6-trimethyl-1,3,5-triazine and the reacted units of the 4,4′-biphenyldicarbaldehyde form a COF-701, where the palladium nanoparticles are on an outer surface of the COF-701. The co-catalyst is n-tetrabutylammonium bromide.

The invention belongs to the technical field of asymmetric catalysis, and discloses a chiral phosphine nitrogen-nitrogen tridentate ligand based on a ferrocene skeleton as well as a preparation method and application of the chiral phosphine nitrogen-nitrogen tridentate ligand. The structural formula of the ligand is shown as (I) or an enantiomer (II) of the ligand. The preparation method comprises the steps of acylation reaction, oxazoline ring construction, aldehyde group introduction, reductive amination and the like, and application in asymmetric hydrogenation reaction, such as asymmetric hydrogenation of aryl ketone. The ligand has a plurality of chiral factors, simultaneously has a potential hydrogen bond donor, forms secondary interaction with a substrate in an asymmetric catalytic reaction, can further stabilize a reaction transition state, is an efficient novel chiral P, N, N-ligand, has the advantages of high reaction activity, good stereoselectivity, wide substrate range and the like, and has a wide application prospect. # imgabs0 #

The invention relates to the technical field of chemistry, in particular to a synthesis process of 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride, which comprises the following steps: by taking 4-fluoro-3, 5-dimethylbromobenzene as a raw material and hydrazine hydrate as a hydrazine source, matching with alkali such as potassium hydroxide, sodium hydroxide or potassium phosphate and the like, reacting at the temperature of 60-80 DEG C to obtain the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride. The preparation method comprises the following steps: by taking copper or nickel source catalysts such as cuprous bromide, cuprous iodide, nickel salicylate and the like, N, N-bis (2, 6-dimethylphenyl) oxamide as a ligand, hexadecyl trimethyl ammonium bromide as a stabilizer and a dioxane-water mixed system as a solvent, reacting at 80-110 DEG C under the protection of nitrogen, separating a reaction mixed solution after the reaction is finished, and separating the reaction liquid to obtain the target product. And purifying to obtain a finished product of the 4-fluoro-3, 5-dimethyl phenylhydrazine hydrochloride. Therefore, the problems that the synthesis of the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride is poor in safety, low in production efficiency, poor in environmental friendliness, small in substrate application range and the like are solved.

The invention relates to the technical field of surfactants, and particularly discloses a preparation method and application of a sulfosuccinate type surfactant, and the preparation method specifically comprises the following steps: (1) esterification reaction: under the protection of inert gas, adding fatty alcohol and carboxylic acid anhydride, introducing gas for 10-20 minutes, adding a difunctional acidic site catalyst, heating to 95-105 DEG C, and reacting for 2-3 hours to obtain an esterification product; and (2) sulfonation reaction: cooling the esterification product to 70-80 DEG C, dropwise adding 20-40wt% of sulfonating agent aqueous solution, preserving heat for 1-2 hours after dropwise adding, and then performing post-treatment to obtain the sulfosuccinate type surfactant. In the preparation process, one-pot preparation is realized by regulating and controlling process conditions and developing a catalyst to efficiently catalyze esterification and sulfonation, intermediate products do not need to be separated between esterification and sulfonation, material loss caused by transfer and separation is avoided, the adopted catalyst can be used for inhibiting premature oxidation of a sulfur source in the sulfonation process, and the sulfonation efficiency is improved. The generation of byproducts is reduced, and the yield is improved.

The invention belongs to the field of fine chemical engineering, and discloses a method for synthesizing 2, 3-dimethyl-2-isopropyl butyronitrile, which comprises the following steps of: adding an organic amine solvent into a high-pressure reaction kettle, adding sodium amide, sodium iodide and a phase transfer catalyst into the reaction kettle under the protection of nitrogen and in a stirring state, stirring for a certain period of time, and reacting for 2-3 hours to obtain 2, 3-dimethyl-2-isopropyl butyronitrile. Dropwise adding a mixed solution of propionitrile and 2-bromopropane into the reactor, controlling the dropwise adding speed and the reaction temperature, continuously reacting for a period of time after the dropwise adding is finished to obtain a reactant solution, cooling the reactant solution, adding water, standing for layering, collecting an organic phase, distilling the organic phase at normal pressure to recover a solvent, and rectifying at reduced pressure to obtain 2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3-pentanediol. According to the method, the sodium iodide, the phase transfer catalyst and the organic amine have a synergistic effect, so that the reaction time is shortened, and the yield of the product is improved.

Disclosed are perfluorinated SABRE catalysts comprising a d-block element and a perfluorinated ligand, wherein the perfluorinated ligand is of Formula (I): [Lm-(NHC)—(Y—Z)q] or a salt thereof. Also disclosed is a method of preparing a hyperpolarized substrate comprising a ½ spin nucleus or nuclei using the perfluorinated SABRE catalysts, and isolating the resulting hyperpolarized substrate for administration to an animal. Further disclosed is a method of imaging a tissue of an animal suspected of having a disease or condition.

The invention relates to application of an amide ligand and a copper catalyst in preparation of an amino indazole piperidine compound. The indazole piperidine compound is prepared by reacting a halogen-substituted indazole piperidine compound with an ammonia reagent, the reaction is carried out under the action of an amide ligand and a catalyst, the amide ligand is # imgabs0, the structural formula of the amide ligand is # imgabs1 # or L-hydroxyproline, and the catalyst is a cuprous compound.

The invention discloses a preparation method of L-5 methyltetrahydrofolic acid based on an MOFs catalyst, and high-selectivity hydrogenation and methylation of folic acid are realized under mild conditions by designing MOFs material loaded noble metal nanoparticles with a chiral confinement effect. The method does not need an optical resolution step, and the ee value of the product is gt; and the catalyst can be recycled, so that the method is suitable for industrial production.

The invention relates to a copper-based catalyst for catalyzing acetylene hydrochlorination and a preparation method and application thereof, the copper-based catalyst comprises a carrier, a phosphine-containing ligand and a copper-containing stable metal precursor; the molar ratio of the stable-state metal precursor to the phosphine-containing ligand is (2: 1)-(16: 1), and the mass of copper in the copper-containing stable-state metal precursor is 5-10% of the mass of the copper-based catalyst. For a copper-based catalyst containing ligand dimethyl phosphine oxide, when reaction gas contains a certain amount of water vapor, the activity and selectivity of the catalyst are still maintained at a relatively high level; when the reaction gas contains a certain amount of hydrogen, the influence on the activity and selectivity of the catalyst is small, which indicates that the catalyst has excellent hydrophobicity and reduction resistance in the acetylene hydrochlorination reaction, thereby not only enhancing the generation efficiency of the vinyl chloride monomer, but also prolonging the service life of the catalyst and lowering the production cost.

The invention relates to the technical field of organic catalysis, in particular to a method for preparing glycolaldehyde by catalyzing formaldehyde hydroformylation. The method comprises the following steps: introducing CO and H2 into a mixed solution of paraformaldehyde, a rhodium compound, a ligand and a solvent, and reacting to prepare glycolaldehyde, the ligands comprise a ligand 1 and a ligand 2; the ligand 1 is selected from one or more of compounds as shown in the following L1-L8: # imgabs0 #; the structural formula of the ligand 1 is as shown in the specification, the structural formula of the ligand 2 is as shown in the specification, namely # imgabs1 # or # imgabs2 #, R1 is H, (CH2) ACH3, O-(CH2) ACH3, X or CX3, the value range of A is 0-3, and X is a halogen atom. According to the method disclosed by the invention, different ligands are subjected to dominant combination and cooperate with the rhodium-based catalyst, so that glycolaldehyde is obtained with high conversion rate and high selectivity under relatively mild conditions.

The present application belongs to the technical field of the synthesis of chiral boron compounds, and in particular relates to an MOF-Cu(II) / CMC composite material, and a preparation method therefor and the use thereof. The preparation method for an MOF-Cu(II) / CMC composite material of the present application comprises: dropwise adding an aqueous solution of sodium carboxymethyl cellulose to an aqueous solution of a bivalent copper salt, performing solid-liquid separation, mixing obtained composite microspheres with an organic solution of trimesic acid, heating the resulting mixture, and subjecting same to solid-liquid separation, so as to obtain an MOF-Cu(II) / CMC composite material. The MOF-Cu(II) / CMC composite material is used in an asymmetric chiral boron addition reaction. The reaction is performed at room temperature, involves mild conditions, is applicable to a wide range of substrates and has a high yield and enantioselectivity. Moreover, the method can achieve the synthesis of a chiral organic boride in a solvent having simple components, providing an efficient new method for the preparation of drug molecules and active intermediates, and also broadening the range of substrates used for the preparation of chiral organic borides.

The invention provides a composite catalyst material and a preparation method and application thereof, and relates to the technical field of water environment treatment. The preparation method comprises the following steps: (1) adding an alkaline aqueous solution into microplastics, and then adding an accelerator for a hydrolysis reaction to obtain a first reaction solution; (2) adding acid into the first reaction solution to adjust pH to be acidic, and then adding ferric chloride for a solvothermal reaction to obtain a second reaction solution; and (3) carrying out post-treatment on the second reaction solution to obtain the composite catalyst material. The invention solves the technical problem of low resource utilization rate of microplastic degradation in the prior art.

The invention discloses application of a sulfonamide ionic liquid catalyst system in preparation of cyclic carbonate, sulfonamide ionic liquid comprises cations and anions, and the cations are one or more of tetra-alkyl ammonium ions, tetra-alkyl phosphonium ions and trimethyl hydroxyethyl ammonium ions; the anion is one or more of sulfonamide ions or substituted sulfonamide ions; the sulfonamide ionic liquid is used as a catalyst and is used for catalyzing CO2 to react with an epoxy compound to prepare cyclic carbonate; the catalyst is easy to prepare and high in catalytic activity, under normal pressure, the dosage of the catalyst is 1-3 mol%, the reaction time is 1-48 hours, the reaction temperature is 25-100 DEG C, and a substituted epoxy compound can be converted into corresponding cyclic carbonate with high conversion rate and high selectivity. After the catalyst system is recycled for five times, the catalytic effect is not obviously reduced. Meanwhile, the catalyst system has good universality to substrates, and conversion of various epoxy compounds can be efficiently achieved.

The invention discloses a method for recovering monohydroxyethyl terephthalate from a polyester textile, which comprises the following steps: carrying out multi-stage decolorizing treatment on the polyester textile to be recovered by using ethylene glycol as a decolorizing agent to obtain the decolorized polyester textile; mixing a depolymerization catalyst, a sodium phosphate buffer solution and the decolored polyester textile, and carrying out a depolymerization reaction to obtain a depolymerization solution; adding ethyl acetate into the depolymerization liquid for extraction, rotary evaporation concentration and sublimation treatment to obtain monohydroxyethyl terephthalate. According to the method for recycling the monohydroxyethyl terephthalate from the polyester textile, the decolorization rate of the polyester textile can reach 90% or above, the purity of the recycled monohydroxyethyl terephthalate is larger than 98%, and the whiteness of the recycled monohydroxyethyl terephthalate is larger than 97%. The method for recycling the monohydroxyethyl terephthalate from the polyester textile, provided by the invention, is an efficient, economical and green new method for recycling the polyester, and the recycling of the polyester textile is realized.

The invention belongs to the technical field of fine chemical engineering, and discloses a synthesis method of a malonate compound, which comprises the following steps: under the action of a heterogeneous catalyst, carrying out hydrolysis-esterification reaction on cyanoacetic acid and alcohol, and after the reaction is finished, carrying out post-treatment to obtain the malonate compound, the heterogeneous catalyst comprises a carrier and an active component; the active component comprises ionic liquid and active metal; the carrier is an ordered mesoporous material; the active metal is alkaline earth metal. According to the method, malonate products can be obtained, the problems of low yield, serious equipment corrosion and large amount of three wastes are solved, efficient synthesis of malonate compounds is realized, meanwhile, the production efficiency is improved, and the environmental pollution is greatly reduced.