1112 results about "Hydrogenation reaction" patented technology

The invention relates to a preparation method of phenylmethylamine. The technical scheme adopted by the invention for mainly solving the problems of high catalyst loss, low production efficiency and high intermittent operation labor intensity is as follows: the preparation method of the phenylmethylamine comprises the following steps: mixing the raw material of cyanobenzene with a solvent material or at least one of one part of product materials in a mixing unit, introducing the mixture into a fixed bed hydrogenation reactor to be in contact with hydrogen and a catalyst and carry out multi-phase continuous hydrogenation reaction to obtain a product material containing phenylmethylamine, separating the product material to obtain a phenylmethylamine product, wherein the catalyst is a metal loaded catalyst; and the metal is selected from at least one of Pd, Pt, Cu, Ni, Mo and Fe. The preparation method can be used for preparing phenylmethylamine.

The invention relates to the technical field of reactors, and discloses a uniform gas-liquid distribution suspended bed reactor for heavy oil hydrogenation, which comprises a reactor shell, a gas-liquid distribution disc is horizontally arranged at the lower end of an inner cavity of the reactor shell, a Venturi annular gas-liquid diffuser is arranged on the gas-liquid distribution disc, and a pre-distribution chamber is formed at the bottom of the gas-liquid distribution disc; the Venturi annular gas-liquid diffuser comprises an outer gas guide pipe arranged on the gas-liquid distribution disc in a penetrating mode. According to the Venturi annular gas-liquid diffuser, through the synergistic effect of a liquid-phase flow annular nozzle and a gas-phase flow annular nozzle, a liquid phase sprayed out at a high speed is actively sheared and broken relative to a low-speed gas phase, and uniform small bubble groups can be generated, so that the gas-liquid contact area is greatly increased; the dissolution rate and the mass transfer efficiency of the hydrogen into the heavy oil are remarkably improved, so that the hydrogenation reaction depth and the product quality are directly improved, and meanwhile, the catalyst in a catalyst suspended bed reaction zone is effectively protected.

The invention discloses a hydrofining method for optimizing the chromatic value of a bio-based terephthalic acid product, and belongs to the technical field of terephthalic acid hydrofining. The special refining process suitable for the bio-based CTA is formed by optimizing the whole process of pretreatment, hydrogenation reaction and post-treatment. The process not only solves the problem that the bio-based raw material has many impurities, but also realizes the balance of environmental protection and economy through the green solvent (water), the efficient catalyst (Pd / C) and controllable parameter design, provides a feasible path for the industrial production of bio-based PTA, and promotes the transformation of the polyester industry to sustainable development. The method provided by the invention is high in impurity removal rate, can efficiently purify the bio-based CTA to obtain a product meeting the PTA standard, is mild in reaction condition, realizes low-energy-consumption and high-stability operation under efficient catalysis, is small in process pollution, and reduces the environmental load.

This invention discloses a method for modifying the support medium of a Pd catalyst and its application. The preparation method of the Pd catalyst includes reacting zirconium salt, organic ligands, and acid to obtain a support UiO-66-X; then loading Pd onto the support UiO-66-X and reducing it to obtain the catalyst Pd@UiO-66-X; the organic ligands include 2-nitroterephthalic acid, 2-methoxyterephthalic acid, 2-aminoterephthalic acid, and terephthalic acid, and X is selected from NO2, OMe, NH2, and H. This invention changes the surface electron cloud density of the supported Pd nanoparticles by changing the ligands (-NO2, -H, -OMe, -NH2) of the support UiO-66, resulting in different abilities to activate hydrogen, thereby regulating the dehydrogenation and hydrogenation reactions in the racemicization process of Pd catalysis. The synergistic effect of different ligands with Pd changes the racemicization catalytic activity.

The invention discloses a method for preparing 1, 3-propylene glycol by hydrating and hydrogenating acrolein, which comprises the following steps: carrying out hydration reaction by taking an acrolein aqueous solution as a raw material and taking acylated and aminated modified polystyrene resin as a catalyst; carrying out flash evaporation or gas stripping on the product after the reaction to remove acrolein, condensing and recovering the removed acrolein, and carrying out hydrogenation reaction on the acrolein-removed mixed solution serving as a hydrogenation raw material on a metal catalyst; and after the reaction is finished, performing flash evaporation on the product to remove water and light components, and performing vacuum rectification to obtain a high-purity 1, 3-propylene glycol product. According to the method, the modified resin is used for catalyzing the acrolein hydration reaction, the overall yield of the 1, 3-propylene glycol can be increased, the catalyst modification process is simple, the cost is low, the additional value of the final product is high, and the method is suitable for industrial production.

The invention discloses a hydrogenated cycloolefin copolymer, a hydrogenated cycloolefin resin composition and a preparation method thereof. Under the condition that the monomer composition and molecular weight of the hydrogenated cycloolefin copolymer are certain, the hydrogenated cycloolefin copolymer with more excellent performance can be obtained by controlling the hydrogenation reaction conditions of the hydrogenated cycloolefin copolymer. The hydrogenated cycloolefin resin composition provided by the invention not only has the characteristics of high refractive index, low haze and aging and yellowing resistance, but also obviously improves the separation efficiency of a catalyst, has excellent processability, and has outstanding application prospects in the fields of medical packaging materials, high-end photoelectric materials and the like.

This invention relates to the field of petroleum refining and chemical engineering, and discloses a method for hydrogenating waste tire pyrolysis oil. The method includes the following steps: (1) in the presence of hydrogen, the waste tire pyrolysis oil raw material undergoes a gas-phase desulfurization reaction in a first gas-phase hydrogenation reactor to obtain a gas-phase desulfurization reaction product; (2) the gas-phase desulfurization reaction product is subjected to gas-liquid separation to obtain a gas-phase component and a liquid-phase component; (3) the liquid-phase component is pressurized and mixed with hydrogen, and then subjected to a liquid-phase dearomatics reaction in a second hydrogenation reactor to obtain a liquid-phase dearomatics reaction product; the nitrogen content in the waste tire pyrolysis oil raw material is 3000-10000 μg / g. This method uses waste tire pyrolysis oil from the middle distillate as raw material, achieving deep desulfurization while reducing the removal of nitrogen oxides and monocyclic aromatic hydrocarbon saturation. It also simplifies the overall process flow, reduces the reaction severity, and lowers energy and hydrogen consumption.

The invention relates to the technical field of hydrodesulfurization catalysts, and discloses a molecular sieve hydrodesulfurization catalyst and a preparation method thereof.Active Si-Cl bonds of maleate methyl dichlorosilane react with hydroxyl in an MCM-41 molecular sieve, then hydrolysis is conducted through sodium hydroxide, and therefore a large number of carboxyl groups are grafted in the molecular sieve; carboxyl can form a strong coordination effect with metal ions such as nickel and the like, so that nickel and molybdenum are uniformly adsorbed into a matrix of the molecular sieve, a nickel-molybdenum oxide catalytic active center is uniformly generated in the molecular sieve through high-temperature roasting, catalytic sites are not easy to agglomerate, the dispersity is good, and the catalytic activity is stable. The catalyst can effectively perform hydrogenation reaction on sulfur-containing substances such as thiophenes in straight-run diesel oil, and has higher desulfurization rate. The catalyst has good practical application in the aspects of oil hydrodesulfurization catalysis and the like.

The invention provides a 3-hydroxypropionaldehyde hydrogenation catalyst as well as a preparation method and application thereof. The 3-hydroxypropionaldehyde hydrogenation catalyst comprises a carrier and an active component loaded on the carrier, wherein the active component comprises a nickel element, a first auxiliary agent metal element and a second auxiliary agent metal element; the metal element of the first auxiliary agent is selected from at least one of Cu, Fe, Th, V, Ta, Mn and Ga; the metal element of the second auxiliary agent is selected from at least one of Zr, Ag, Mo, La, Co and Sn; the carrier includes an oxide of titanium and an oxide of cerium. According to the 3-hydroxypropionaldehyde hydrogenation catalyst disclosed by the invention, the non-noble metal nickel element is used as a main active component, so that the preparation cost of the catalyst can be effectively reduced; the nickel metal and the carrier of the specific oxide component form strong interaction, so that the working condition of nickel element loss in the hydrogenation reaction of the 3-hydroxypropionaldehyde can be effectively reduced; in the catalyst, a specific auxiliary metal element can interact with a nickel element and promote the structure optimization of the carrier, so that the catalytic performance of the whole catalyst is further improved.

The invention provides a preparation method of a hydrotalcite-derived cobalt-copper catalyst and application of the hydrotalcite-derived cobalt-copper catalyst in furfural hydrogenation reaction. A series of different layered composite metal oxide precursors are prepared through coprecipitation and ion exchange methods, the layered composite metal oxide precursors are applied to furfural hydrogenation reaction after being pre-reduced, and the reaction with pentanediol and furfuryl alcohol as target products shows excellent catalytic activity. By designing the element composition and structural distribution of the hydrotalcite precursor, the composition, the structure and the physical property of the catalyst are effectively modulated, and the distribution of hydrogenation products is effectively regulated and controlled. The furfural can be completely converted on the Co < 1.5 > Cu < 0.25 > Al < 0.5 > Ox catalyst, and the yield of the product pentanediol reaches 68.8%; the yield of the product furfuryl alcohol reaches 98% on the basis of the Co < 1.5 > Cu < 0.25 > Al < 1.75 > catalyst. Characterization results of the catalyst show that the hydrogenation performance of the catalyst strongly depends on sample element composition, valence states of active species Cu and Co, structural distribution and dispersity of the active species Cu and Co in a precursor and a synergistic effect among different species.

The invention discloses a high-entropy perovskite catalytic material and a preparation method and application thereof, and belongs to the technical field of catalysts.The preparation method comprises the steps that soluble La < 3 + > salt, soluble Co < 2 + > salt, soluble Cu < 2 + > salt, soluble Fe < 3 + > salt, soluble Mn < 2 + > salt and a soluble X ion source (X is Ga, Zn or Zr) serve as raw materials, a complexing agent and water are added to form a mixed solution, a head product is obtained through a solution combustion method, and the high-entropy perovskite catalytic material is obtained through calcination. The chemical formula of the high-entropy perovskite catalytic material is La (CoaCubFecMndXe) O3. The high-entropy perovskite catalytic material provided by the invention has excellent thermal stability, and can still keep good catalytic activity and excellent catalytic stability at high temperature. When the high-entropy perovskite catalytic material prepared by the method is used as a catalyst for CO2 hydrogenation to prepare ethanol, the high-entropy perovskite catalytic material has excellent ethanol selectivity.

The invention discloses a hydrogenation catalyst, a preparation method and application of the hydrogenation catalyst in preparation of 1, 2-pentanediol through furfuryl alcohol hydrogenation, the catalyst comprises a zirconium dioxide carrier (ZrO2) and loaded metal active components; the zirconium dioxide carrier has a monoclinic phase and tetragonal phase blended crystal structure, and based on the total mass of the zirconium dioxide carrier, the content of zirconium dioxide existing in a tetragonal phase form is 20-40%. The catalyst is simple in production process and suitable for large-scale batch production, the obtained catalyst can be used for the hydrogenation reaction of furfuryl alcohol and shows excellent catalytic performance, the reaction process is simple, the reaction condition is mild, the selectivity of 1, 2-pentanediol is high, and subsequent separation becomes simple.

The application relates to a preparation method of PdAg nanosponge and application of the PdAg nanosponge. A certain amount of ethylene glycol is configured into an ethylene glycol aqueous solution, a certain volume of the ethylene glycol aqueous solution is added into a reaction container, then a certain amount of a Pd precursor is quickly added into the ethylene glycol aqueous solution, a certain amount of an Ag precursor is further added, the reaction system is uniformly mixed through ultrasonic, and then the reaction system is statically reacted at 20-60 DEG C for 0.5-3.0 h. After the reaction is completed, the reaction product is centrifuged, the obtained precipitate after centrifugation is washed through ultrapure water, and the PdAg nanosponge is obtained after drying. The application does not need to use a surfactant and a template agent, does not need to additionally add a reducing agent, does not need high temperature, high pressure, stirring and other reaction conditions, and can be statically reacted at 20-60 DEG C, so that the reaction condition is mild and the reaction step is simple. The prepared PdAg nanosponge has a 3D sponge-like structure and is a self-supporting catalyst, the purity is high, and the PdAg nanosponge has excellent catalytic activity and selectivity for selective hydrogenation reaction of furfural.

The present invention provides a catalyst for carbon dioxide reduction with which the conversion of carbon dioxide can be heightened.　The catalyst for carbon dioxide reduction is for reducing carbon dioxide by subjecting the carbon dioxide and hydrogen to a hydrogenation reaction, and includes iron, gallium, and zinc as catalytic metals, the iron being a main component of the catalytic metals.

The present application relates to the technical field of deep processing of petroleum chemical carbon five fraction oil, and particularly relates to a petroleum cracking carbon five fraction oil hydrofining method, wherein a polar competitive adsorbent is added into raw oil before the raw oil enters a main hydrogenation reaction, so that enrichment and deposition of cyclopentadiene (CPD) / dicyclopentadiene (DCPD) and chain double bond components in the catalyst are reduced; meanwhile, a low-acid hole-expanding Ni catalyst is used to reduce the polymerization deposition risk and maintain an effective hydrogenation rate, so that the problems of colloid deposition and pressure drop increase in the front section of the catalyst bed are relieved, and the problem that a Ni-based catalyst in the prior art cannot effectively inhibit the deposition of CPD components for a long time when hydrofining the CPD-containing carbon five fraction oil is solved.

The invention discloses a preparation method of a hydrogen-responsive composite multilayer magnesium-based film surface self-wrinkle pattern. The preparation method comprises the following steps: A, preparing a polymer elastic layer on the surface of a supporting substrate; b, depositing a plurality of layers of metal-based films on the polymer elastic layer by adopting a magnetron sputtering method; and C, exposing the prepared sample in a hydrogen-containing atmosphere, and forming a wrinkle pattern of which the recognizable size is in a range of 10nm-1000mu m on the surface through hydrogenation reaction at normal temperature. According to the method, the surface of the thin film can be deformed by exposing the thin film to the hydrogen-containing atmosphere environment, so that the three-dimensional wrinkle texture can be quickly realized, and the three-dimensional wrinkle morphology can be accurately regulated and controlled by adjusting the element components, sputtering time, sputtering power, working gas flow and hydrogen treatment parameters of the magnesium or magnesium alloy hydrogen-sensitive reaction film layer. The pattern features of the prepared wrinkle pattern can be recognized through characterization means such as an optical microscope, a scanning electron microscope, an atomic force microscope or a diffraction light-variable device.

The application discloses a method and device for producing bright stock, and the obtained bright stock, which comprises the following steps: (1) contacting heavy oil with a hydrogenation catalyst under the presence of hydrogen, and performing hydrogenation reaction under hydrogenation treatment conditions to obtain a hydrogenation product; (2) performing alkylation reaction of aromatics in the hydrogenation product and C10-C20 olefins in olefin oil under the presence of a strong acid catalyst and under alkylation reaction conditions to obtain an alkylation product; and (3) performing distillation separation on the alkylation product to separate and obtain a heavy fraction with a temperature greater than 500 DEG C as the bright stock product. The method provided by the application expands the raw material source of the bright stock, simplifies the process flow, and is convenient for industrial production; and the prepared bright stock product not only has high viscosity and viscosity index, but also has good low-temperature flow performance and high oxidation stability.

The invention relates to a method and a system for preparing trichlorosilane from ferrosilicon, the method comprises the following steps: taking ferrosilicon, silicon tetrachloride and hydrogen as raw materials, fully reacting in a fluidized bed reactor to obtain trichlorosilane and FeSiy alloy, xlt; 40). The system comprises a fluidized bed reactor (200), a cyclone separator (300), a washing tower (400), a gas-liquid separator (500) and a coarse distillation tower (600). Compared with the prior art, the method has the remarkable characteristics that the silazite is used as a silicon source and is low in cost and easy to obtain, the reaction activity of trichlorosilane and FeSiy generated by reaction of the silazite, silicon tetrachloride and hydrogen is high, the utilization rate of silicon elements in the compound is high, no extra catalyst needs to be added in the co-hydrogenation reaction, meanwhile, the byproduct FeSiy alloy is produced, and the production cost is low.

The invention discloses a method for preparing isostearic acid by hydrogenation of a bio-based carrier catalyst, and relates to the technical field of oleochemical engineering and catalyst preparation, and the method comprises the following steps: S1, preparing a bio-based supported catalyst; s2, taking isomerized oleic acid as a raw material, and carrying out catalytic hydrogenation reaction under the action of a catalyst; s3, separating a product obtained after the hydrogenation reaction to obtain isostearic acid; according to the method for preparing isostearic acid by hydrogenation of the bio-based carrier catalyst, oyster shells are selected as a catalyst carrier, and specific pretreatment and high-temperature firing are performed, so that waste biomass resources are converted into a high-specific-surface-area calcium oxide carrier with a natural nanoscale sheet-shaped superposed three-dimensional space structure; high-value utilization of waste resources is achieved, so that the effects that the cost of raw materials of the catalyst is remarkably reduced and the carrier is environmentally friendly are achieved, and the high-activity non-noble metal hydrogenation catalyst is obtained by adopting copper nitrate solution impregnation and combining with a loading mode of subsequent hydrogen reduction.

This invention provides a method for preparing and applying a highly insecticidal diamide compound, relating to the chemical and pesticide fields. The method includes: reacting 2-fluoro-3-nitrobenzoic acid with thionyl chloride (a chlorinating agent) and dimethylformamide (a catalyst) to obtain compound A; condensing compound A with 2-trifluoromethyl-4-heptafluoroisopropyl-6-bromoaniline amide to obtain compound B; reducing compound B to obtain compound C; and, during the reaction under a hydrogen atmosphere, determining the reaction temperature and hydrogen flow rate in each hydrogenation reaction zone based on the concentration of compound B; reacting compound C with paraformaldehyde to obtain compound D; chlorinating 3-chloro-4-fluorobenzoic acid with thionyl chloride (a chlorinating agent) and dimethylformamide (a catalyst) to obtain compound E; and amide condensing compound E with compound D to obtain the novel diamide compound of this invention. The diamide compound of this invention exhibits excellent insecticidal effects when used in pesticide compositions.

The invention discloses an ethylene pyrolysis gasoline and wash oil mixed hydrogenation production system, and relates to the technical field of quality improvement and efficiency improvement of an ethylene process, which is characterized in that wash oil and ethylene pyrolysis gasoline respectively pass through respective pretreatment systems, are pretreated and then are fed into respective first reactors; and the wash oil and ethylene pyrolysis gasoline passing through the first reactor enter a second reactor together for hydrogenation reaction, and then a product in the second reactor is separated. The invention solves the industry development problem of low economic benefit and market competitiveness caused by low resource utilization efficiency of traditional by-products (such as compressor wash oil and pyrolysis gasoline) in the existing ethylene industry and increase of production cost of the device.

The invention provides a steroid hormone double-bond selective hydrogenation catalyst as well as a preparation process and application thereof, and belongs to the technical field of catalysts. The preparation process of the hydrogenation catalyst comprises the following steps: (1) preparing a carrier loaded with an active metal: dispersing the carrier in a cerium-containing metal salt ethanol solution, stirring, and carrying out suction filtration, drying and temperature programming roasting after stirring to prepare the carrier loaded with the active metal; (2) loading a bimetal carrier: dipping the active metal-loaded carrier in the precursor solution, carrying out ultrasonic-assisted dipping, and then dropwise adding an alkali solution to adjust the pH value of the solution so as to obtain a bimetal-loaded carrier solution; and (3) reduction: slowly dropwise adding a reducing agent solution into the solution, and after reduction is completed, separating, washing and carrying out vacuum drying to obtain the catalyst. The preparation process is green and safe, and the prepared catalyst can be used for selective hydrogenation reaction of steroid hormone double bonds and has relatively high selectivity and conversion rate.

The invention discloses a preparation method of a metal organic framework catalyst and application of the metal organic framework catalyst in biomass furfural hydrogenation, and belongs to the technical field of catalytic hydrogenation. The preparation method of the metal organic framework catalyst comprises the following steps: S1, dissolving cobaltous acetate, L-glutamic acid and phosphomolybdic acid in distilled water to obtain a solution marked as a solution A; dissolving 1, 3, 5-benzenetricarboxylic acid (BTC) in ethanol to obtain a solution B, pouring the solution B into the solution A, stirring, and centrifuging to collect a precipitate; and S2, calcining the precipitate in an inert atmosphere to obtain the metal organic framework catalyst. The specific steps of applying the catalyst to the furfural hydrogenation reaction are as follows: adding the prepared catalyst and furfural into deionized water, performing heating and pressurizing reaction through a hydrogenation reaction kettle to obtain a solution, extracting the solution with ethyl acetate, and performing GC quantitative detection on the product after the extraction reaction. The method is mild in reaction condition, has an efficient furfural hydrogenation effect, and can completely convert FFA within 2 hours under the condition that 50 mg of catalyst is added.

This invention discloses a platinum-based catalyst for the hydrogenation reaction, its preparation method, and an electrode. The catalyst uses orthorhombic niobium pentoxide (T-Nb₂O₅) as a support to support the active component platinum. The support is resistant to strong acids and electrochemical corrosion at potentials above 1.0 V (vs RHE). The catalyst exhibits a hydrogenation reaction current density of not less than 200 mA·cm⁻¹ at 0.45 V (vs RHE). ‑2 In preparation, ammonium niobate oxalate hydrate was used as the niobium source, and the mixture was gelled via a sol-gel method. The gel was then heat-treated at 600-700℃ to obtain an orthorhombic niobium pentoxide support. The pH was adjusted to less than 3, and platinum was reduced with sodium borohydride to prepare the catalyst. This catalyst was then used to fabricate a hydrogen depolarization anolyte gas diffusion electrode with a platinum loading of 0.5-1.0 mg·cm³. ‑2 It can operate continuously and stably for no less than 120 hours with a cell voltage in the range of 1.25-1.45V. The catalyst of this invention has high activity and excellent stability, and can be used as a hydrogen depolarization anode in hydrometallurgy, significantly reducing electrolysis energy consumption and making it suitable for industrial applications.

The invention discloses a hydrogenated lecithin synthesis method based on a nickel catalysis continuous flow strategy, relates to the technical field of preparation of hydrogenated lecithin, and aims to solve the problem that the cost of preparing the hydrogenated lecithin is greatly increased due to the fact that the hydrogen pressure is relatively high and recycling of a catalyst is not considered in an existing method. The preparation method is technically characterized by comprising the following steps: (1) performing heat treatment on moso bamboo powder in a protective gas atmosphere to obtain a carbon carrier; dipping the carbon carrier in an alkali solution, and then carrying out a high-temperature activation reaction in a protective gas atmosphere; an activated carbon carrier is obtained; the preparation method comprises the following steps: loading a nickel source, an auxiliary agent and a structure stabilizer into an activated carbon carrier by dipping to obtain a catalyst precursor, and pyrolyzing the catalyst precursor in a protective gas atmosphere to obtain a Ni / C catalyst, and (2) preparation of hydrogenated lecithin: dissolving lecithin in a mixed solution of dichloromethane and methanol, taking a Ni / C catalyst, filling a catalytic pipeline with the Ni / C catalyst, and carrying out a hydrogenation reaction under hydrogen flow to obtain the hydrogenated lecithin.

The invention discloses a Ni-K modified supported catalyst, preparation thereof and application of the Ni-K modified supported catalyst in acetylene semi-hydrogenation reaction. The preparation method of the catalyst comprises the following steps: 1, completely dissolving an active metal salt, a nickel salt and a potassium compound in a solvent to obtain a uniform mixed solution; 2, fully loading the active metal salt, the nickel salt and the potassium compound in the mixed solution onto the carrier through wet impregnation, and then drying and grinding to obtain precursor powder; 3, calcining the precursor powder in an inert or air atmosphere at 300-600 DEG C to obtain a calcined product; and 4, carrying out reduction activation on the calcined product in a reducing atmosphere at 350-450 DEG C to obtain the Ni-K modified supported catalyst. The invention provides the application of the Ni-K modified supported catalyst in acetylene semi-hydrogenation reaction, and the Ni-K modified supported catalyst has high acetylene conversion rate, high ethylene selectivity and good stability.

The invention relates to the technical field of catalysts, in particular to a palladium-based catalyst derived from MOFs as well as a preparation method and application of the palladium-based catalyst. The preparation method comprises the following steps: firstly preparing an MOF material, then preparing a palladium-based MOF precursor, mixing the palladium-based MOF precursor with a nitrogen-containing precursor, heating and roasting in an inert atmosphere, and cooling to room temperature. An external nitrogen-containing precursor is introduced in the high-temperature pyrolysis process and is jointly roasted with a palladium-based MOF precursor, the nitrogen doping amount in the carbon carrier is remarkably increased, and high dispersion and electronic structure optimization of Pd particles are achieved by enhancing the anchoring effect and electronic regulation and control of nitrogen species on the Pd nanoparticles; therefore, high activity, high selectivity and high stability are simultaneously obtained in the selective hydrogenation reaction of 2-methyl-3-butyne-2-alcohol.

A continuous production process of a xylylenediamine compound comprises the following steps: a, mixing an aromatic dinitrile raw material, an organic composite solvent, a catalyst and an auxiliary agent according to a preset proportion to form a reaction raw material, and conveying the reaction raw material to the lower part of a hydrogenation reactor; b, hydrogen is input from the bottom of the hydrogenation reactor in a jet mode, the reaction raw materials and the hydrogen are subjected to a contact reaction, and the hydrogen is further used for providing driving force needed by reaction material airlift; and c, conveying the reaction material to the upper part of the hydrogenation reactor, and carrying out cyclone separation operation and the like. A device for realizing the continuous production process comprises a hydrogenation reactor, a raw material supply unit, a hydrogen circulation supply unit, a product filtering unit, a product buffer tank and the like. The invention relates to the field of organic and fine chemical synthesis, realizes continuous, stable, automatic and simple production of xylylenediamine compounds, and has the technical advantages of simplifying the production process, optimizing the reaction conditions, improving the safety and economy, saving energy, reducing consumption and the like.

The invention provides a catalyst for maleic acid water phase hydrogenation as well as a preparation method and application thereof. The catalyst comprises a carrier, an active metal component and a nitrogen-doped carbon layer, wherein the nitrogen-doped carbon layer is formed by shrinking and carbonizing melamine and formaldehyde in pores of the carrier loaded with the active metal component, and the active metal component is coated with the nitrogen-doped carbon layer; the active metal component is selected from at least one of palladium, ruthenium, gold, rhodium and iridium, and the carrier is a spherical or granular porous material. The catalyst disclosed by the invention comprises the nitrogen-doped carbon layer formed by shrinking melamine and formaldehyde in pores of the carrier loaded with the active metal components and carbonizing, so that the active metal components of specific types can be promoted to be uniformly dispersed in the catalyst structure, and the catalytic performance is improved; meanwhile, by combining the effect of the carrier, the mechanical strength of the catalyst is effectively improved, so that the catalyst can still maintain high activity after being used in an acid environment for a long time, and the maleic acid water-phase hydrogenation reaction can be efficiently catalyzed in a long-life manner.

The invention discloses a method for preparing monophenol compounds from lignin. The method comprises the following steps: mixing a raw material lignin with a solvent, and carrying out a one-step hydrogenation reaction in a hydrogen atmosphere under the action of a nickel-molybdenum-based catalyst to prepare the monophenol compound, the nickel-molybdenum-based catalyst comprises metal nickel and nickel oxide, molybdenum oxide and silicon oxide. The method provided by the invention has the characteristics of low production cost, simple separation, high monophenol compound yield and the like.