14results about How to "High product selectivity" patented technology

The invention discloses a catalyst used for preparing acrylic acid and butyl ester by the dehydration of butyl lactate and a preparation method thereof. The catalyst is a composite catalyst, comprising a main catalyst A and auxiliary catalysts B, C, D and E, wherein, A is calcium sulphate, B is sulphuric acid, C is phosphate, D is alkaline matter and E is promoter. The preparation method comprises the steps as follows: five compositions A, B, C, D and E are sufficiently mixed, baked for 2-10 hours at the temperature of 200-800DEG C and formed for standby. The catalyst has high catalytic activation; under the catalysis of the catalyst, the molar yield reaches 75.1 percent and the molar selectivity of the acrylic acid and butyl ester reaches 71.5 percent. The preparation method has the advantages that the crystal structure of the main catalyst can be improved so as to be beneficial for carrying out the reaction; and the introduction of different auxiliary catalysts and quantities is helpful to improve the conversion ratio of the raw material and the product selectivity and is beneficial for improving the strength of the catalyst.

The invention provides a hydrocyanation reaction method, the hydrocyanation reaction method is carried out in a reaction system containing aromatic amine under the action of a nickel-monodentate phosphite ligand catalyst, the structure of the aromatic amine is # imgabs0 #, and X1-X3 groups and Y1-Y3 groups respectively comprise any one of hydrogen, alkyl, alkoxy, alkylamino, hydroxyl and amino. The nickel-monodentate phosphite ligand catalyst and the aromatic amine with a specific structure are used in the hydrocyanation reaction method, so that the time of the hydrocyanation reaction method can be catalytically shortened, accumulation of ligand hydrolysate can be remarkably reduced or eliminated, and the loss of the catalyst in the reaction is reduced. The hydrocyanation reaction method disclosed by the invention is high in reaction efficiency, stable in catalyst performance, high in raw material conversion rate and product selectivity, and can be used for a preparation process for preparing adiponitrile by a direct hydrocyanation method of large-mass butadiene.

The invention provides a hydrocyanation reaction method, the hydrocyanation reaction method is carried out in a reaction system containing aromatic amine under the action of a nickel-bidentate phosphite ligand catalyst, the structure of the aromatic amine is # imgabs0 #, and X1-X3 groups and Y1-Y3 groups respectively comprise any one of hydrogen, alkyl, alkoxy, alkylamino, hydroxyl and amino. The hydrocyanation reaction method is high in reaction efficiency, accumulation of ligand hydrolysate can be remarkably reduced or eliminated, and the effective content of a catalyst in a reactant is stabilized; in addition, the hydrocyanation reaction method has the advantages of high reaction efficiency, few side reactions, high raw material conversion rate and high product selectivity, and can meet the requirements of a large-scale production process for preparing adiponitrile by using a butadiene direct hydrocyanation method.

The present disclosure relates to a method for preparing methyl methacrylate and methylacrolein from methyl propionate, the method comprising: contacting a first stream comprising methyl propionate and a formaldehyde source with a catalyst and performing an aldol condensation reaction to obtain a second stream comprising methyl methacrylate and methylacrolein; the catalyst comprises a molecular sieve with metal elements, the metal elements comprise skeleton metal elements and non-skeleton metal elements, and the molar ratio of the non-skeleton metal elements to the skeleton metal elements in the molecular sieve is less than 0.1; the skeleton metal element comprises Sn; on the basis of the total mole number of all metal elements in the molecular sieve, the content of framework tin is greater than 90 mol%; the molar ratio of the framework tin to the silicon element in the molecular sieve is (0.001-0.05): 1. According to the method disclosed by the invention, the conversion rate of methyl propionate can be effectively improved, and the selectivity of methyl methacrylate and methylacrolein is improved.

The present application relates to the field of white oil, and specifically to a white oil for mosquito coil liquid and a preparation method thereof. A preparation method for white oil for mosquito coil liquid comprises the following steps: Step 1: adding raw materials to a hydrogenation reactor, and the mixed materials and hydrogen pass through a first catalyst bed and a second catalyst bed to undergo a hydrogenation reaction to obtain a primary product; Step 2: subjecting the primary product to multiple oil-gas separations, and the oil phase obtained by separation is the product; the first catalyst bed and the second catalyst bed are filled with a modified catalyst; the preparation method for the modified catalyst comprises the following steps: Step a: preparing a carrier; Step b: loading a precious metal. The white oil obtained by the preparation method of the present application is specially designed for electric mosquito coil liquid for mothers and infants, improves the quality of the white oil, gives the electric mosquito coil liquid moderate volatility, and effectively enables each component in the mosquito coil liquid to fully exert the mosquito repellent effect.

The invention discloses a preparation method and application of a magnetic composite transition bimetallic oxide catalyst, and belongs to the technical field of transition bimetallic oxide catalysis, the chemical formula is CoxNi (1-x) Fe2O4, and x is 0.05-0.25. A cobalt salt, a nickel salt and an iron salt are used as raw materials, a strong reducing agent is added, and a one-pot hydrothermal crystallization method is adopted. The composite transition bimetal oxide catalyst provided by the invention is simple in preparation method, short in production period and relatively strong in inherent magnetism, and can be accurately separated by virtue of an external magnetic field after being used, so that the recovery and reutilization of the catalyst are realized; the problems that metal active components are easy to lose, and the catalyst is easy to deactivate due to carbon deposition and is difficult to recover in the using process of a metal supported catalyst are thoroughly solved. The gt can be efficiently and selectively cracked when the gt is applied to a relevant model compound of lignite and a catalytic hydrogenation conversion process of Dongming lignite in Inner Mongolia; c to Clt; and a heteroatom gt; c-X bridged bonds (X = O, N, S and the like), so that the purpose of converting the low-metamorphic coal into the aromatic hydrocarbon at high yield is achieved.

The application relates to the technical field of organic synthesis, in particular to a preparation method of C9H 12 O. The method is to use phenol and isopropyl alcohol as reaction raw materials, then heat under a protective atmosphere, and make the mixed reaction liquid pass through the surface of a catalyst to complete the reaction and obtain C9H 12 O. In the process, when the catalyst is a phosphate catalyst, isopropyl phenol is mainly synthesized; when the catalyst is an Al-P-O catalyst, ortho-isopropyl phenol and para-isopropyl phenol are mainly synthesized. The reaction has low preparation cost, is not easy to produce harmful substances, is an environmentally-friendly reaction path, and realizes green environmental protection and low cost of C9H 12 O production.

The invention belongs to the technical field of fine chemical intermediates, and particularly relates to a method for generating 2-methyl-1-butene through isomerization of 2-methyl-2-butene. The method comprises the following steps: (1) 2-methyl-2-butene enters a fixed bed reactor and is subjected to an isomerization reaction under the action of an isomerization catalyst; the pressure of the fixed bed reactor is 0.1-0.5 Mpa, the temperature is 200-250 DEG C, and the mass space velocity is 0.5-2.0 h <-1 >; (2) feeding the reacted material into a rectifying tower, rectifying and separating to obtain 2-methyl-1-butene at the top of the rectifying tower, and returning 2-methyl-2-butene obtained at the bottom of the rectifying tower to the inlet of the fixed bed reactor to continue the reaction; the isomerization catalyst comprises active components and a carrier, wherein the active components comprise NiO and MgO. The catalyst provided by the invention has the advantages of high catalyst activity, low reaction temperature, high reaction selectivity, long catalyst life and the like, and meets market requirements.

The invention discloses a palladium-based graphene catalyst, a preparation method and application of the palladium-based graphene catalyst in production of dimethyl carbonate. The palladium-based graphene catalyst comprises a graphene carrier and loaded palladium nanoparticles, and nano tracks are distributed on the surface of the graphene carrier. The preparation method comprises the following steps: etching a nano track on a graphene sheet through a cyclic voltammetry method, and then depositing palladium nano particles through electrochemistry, so that nano palladium can be uniformly distributed in the track, and the palladium-based graphene catalyst is prepared. The palladium-based graphene catalyst can be used in a method for producing dimethyl carbonate (DMC) by catalyzing a gas-phase carbonylation reaction. According to the method, palladium-based graphene catalysis is used for replacing original PbCl2 catalysis for producing dimethyl carbonate.

The present invention provides a kind of aldehyde hydrogenation Cu-based catalyst and its preparation method and application. The composition of the catalyst is Cu-M / SiO2-Al2O3, the content of active component Cu is 20-40wt%, and the content of auxiliary agent M is 1-5wt%. The catalyst preparation method includes: after the active component is mixed with a dispersant, a supported catalyst is obtained by a co-current coprecipitation method, wherein the introduction of a carrier with a large specific surface area can improve the active group dispersion, and the addition of a metal auxiliary agent can effectively promote the interaction (SMSI) of the metal carrier, which is conducive to suppressing its sintering and agglomeration during the reaction, enhancing catalytic activity, and reducing the loss of metal in liquid phase reaction. The catalyst of the present invention reduces the alcoholysis of silicon by adopting a composite carrier, protects the catalyst skeleton from being destroyed, prolongs the catalyst life, and has good performance in aldehyde hydrogenation reaction.

The invention provides a Y / KCC-1 meso-microporous composite molecular sieve and preparation thereof, a hydrocracking catalyst and preparation and application thereof, the Y / KCC-1 meso-microporous composite molecular sieve has a core-shell structure and comprises a Y molecular sieve and a KCC-1 mesoporous material, the Y molecular sieve is tightly wrapped by the KCC-1 mesoporous material, and the surface appearance of the Y / KCC-1 meso-microporous composite molecular sieve is fibrous. According to the invention, the microporous material Y molecular sieve and the mesoporous material KCC-1 are compounded, and respective advantages of the microporous material and the mesoporous material are fully exerted, so that the composite molecular sieve has excellent diffusion performance, proper acid property and pore structure. The Y / KCC-1 composite hydrocracking catalyst prepared by taking the composite molecular sieve as a carrier is a novel catalyst material, has high catalytic activity and selectivity on hydrocracking reaction of 1-methylnaphthalene, and shows higher conversion rate, yield and product selectivity.

The invention discloses a preparation process of gamma-butyrolactone, and relates to the technical field of chemical synthesis. The preparation process comprises the following steps: S1, adding acetic anhydride and an oxidizing agent into a reaction container, introducing ethylene, and heating for reaction to obtain a reactant; s2, the reactant is filtered, filtrate and filter residues are obtained, and the filtrate contains the target product gamma-butylester; s3, the filter residues are recycled after being subjected to roasting treatment, and the filter residues serve as an oxidizing agent to be put into the step S1 again. The method is simple in process flow, easy to operate and high in product selectivity, can reduce the cost of raw materials, can bring high economic benefits, and has production and application values.

The invention relates to the technical field of cyclopentadiene synthesis, in particular to a method for synthesizing cyclopentadiene from cyclopentanone. The method comprises the following steps: by taking cyclopentanone as a raw material, carrying out hydrodeoxygenation tandem dehydrogenation reaction in a fixed bed continuous reactor under the action of an AwBxCyOz type composite metal oxide catalyst or a C / ZnaAlbOc supported metal catalyst at the reaction temperature of 425-625 DEG C under the hydrogen pressure of 0.001 MPa, the molar ratio of hydrogen to cyclopentanone being (20-400): 1 and the weight hourly space velocity of cyclopentanone being 0.1-10h <-1 >, thereby obtaining cyclopentadiene. The method is simple in process route and environment-friendly, the catalyst is simple and convenient to prepare, and a more novel and efficient process route is provided for synthesizing cyclopentadiene from biomass-based cyclopentanone.

The application discloses an NH2-COFS@ZnS photocatalytic material and a preparation method and application thereof. A multi-amino aromatic ligand and a multi-aldehyde aromatic ligand are combined into an NH2-COFS material through a Schiff base reaction, and the NH2-COFS material is combined with a zinc salt and a sulfur source through a hydrothermal reaction to obtain an NH2-COFS@Zn photocatalytic material. The NH2-COFS@ZnS photocatalytic material has excellent photocatalytic activity, good structural stability and reusability, can be applied to photocatalytic reduction of CO2, and has the advantages of simple preparation method, low cost and meeting industrial production.