156results about "Preparation by hydrogenation" patented technology

The invention discloses an impregnation liquid for preparing hydrogenated bisphenol A through bisphenol A hydrogenation. The impregnation liquid comprises a Ru complex, a water-soluble nonionic surfactant and water, wherein the molecular size of the Ru complex is greater than 1nm. According to the preparation method disclosed by the invention, by adopting the impregnation liquid containing the Ru complex of which the molecular size is greater than 1nm and the water-soluble nonionic surfactant, more Ru complex of which the molecular size is greater than 1nm can exist in mesoporous channels of an activated carbon carrier in an impregnation process, so that the contact probability of an active phase and a reactant bisphenol A molecule is increased; the purposes of improving the active metal utilization rate and improving the catalyst activity are achieved.

The application provides a preparation method of an octene aldehyde liquid-phase hydrogenation catalyst, and steps of the method comprise the following: (1) preparing a salt solution containing nickel ions, copper ions and aluminum ions, heating to 40-80 DEG C, adding a basic precipitator to react, and aging after the reaction is completed; (2) uniformly mixing the precipitate obtained after aging in step (1) with silica sol to obtain slurry; (3) washing and filtering the slurry, then adding alkali metal carbonate powder and boron nitride solid, uniformly mixing, and then shaping, drying and calcining to obtain the octene aldehyde liquid-phase hydrogenation catalyst. The preparation method is simple, green, environmentally friendly and easy to industrialize, the conversion rate and selectivity of the obtained octene aldehyde liquid-phase hydrogenation catalyst are high, and the catalyst is stable in performance and durable.

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.

The application discloses a preparation method of an octene aldehyde liquid-phase hydrogenation catalyst, and the preparation method comprises the following steps: (1) adding a weak acid into a salt solution containing silver, magnesium and aluminum, uniformly stirring, then adding a glycerol aldehyde, continuously stirring until a colloid is formed, grinding the colloid to obtain a powder, sieving, and roasting to obtain a carrier; and (2) preparing a precursor solution containing nickel and zinc, placing the precursor solution and the carrier in an ultrasonic container to shake, pouring the shaken solution into a well-sealed ball mill tank, ball milling, and then drying and roasting to obtain the catalyst. The catalyst is prepared by adding a silver-containing compound when the carrier is prepared and the ball milling method, so that the selectivity and stability of the catalyst are improved.

The invention discloses a surface ruthenium-nitrogen coordinated Ru nano-particle catalyst, a preparation method and application of the surface ruthenium-nitrogen coordinated Ru nano-particle catalyst in bisphenol A hydrogenation reaction. Ruthenium acetylacetonate and a nitrogen-containing ligand form a porous precursor by adopting a sol-gel method, and then the porous precursor is subjected to inert gas pyrolysis and H2 / NH3 activation treatment. In an XPS (X-ray polystyrene) N1s spectrogram of the prepared Ru nano-particle catalyst, Ru-N coordination nitrogen at 399.0-399.5 eV accounts for 30%-60% of the total nitrogen atom. When the catalyst is applied to bisphenol A hydrogenation reaction, the sulfur content of the raw material is less than 100ppm, and the yield of hydrogenated bisphenol A can reach 94%; the attenuation is less than 5% after 5 cycles, and the sulfur adsorption capacity of the Ru nano-particle catalyst is less than 0.1 wt%. The surface ruthenium-nitrogen coordinated Ru nano-particle catalyst is high in activity, good in selectivity and excellent in sulfur tolerance, can stably play a role in a sulfur-containing environment, is simple and controllable in preparation process, and is beneficial to industrial production.

The invention relates to a process for the manufacturing of biobased 3-methyl-delta-valerolactone (3MdVL) and 3-methyl-1,5-pentanediol (3MPD) via one- pot hydrogenation of anhydromevalonolactone (aMVL) in the presence of a Raney- Nickel catalyst. The hydrogenation occurs without solvent at a temperature from 120ºC-180ºC, preferably at 130ºC-170ºC and a pressure between 15-30 bar, preferably at a pressure between 18 and 22 bar. The hydrogenation time may vary between 3 and 25 hours, preferably between 6 and 24 hours.

A process for producing 1,4-cyclohexanedimethanol by depolymerizing one or more recycled terephthalate-based polyesters or copolyesters via solvolysis with one or more glycols or alcohols and contacting the depolymerization product with an ester hydrogenolysis catalyst and hydrogen to produce a hydrogenolysis product and contacting the hydrogenolysis product with a hydrogenation catalyst and hydrogen to produce 1,4- cyclohexanedimethanol.

The invention discloses a hydrophobic Ru nano-particle catalyst, a preparation method and application of the hydrophobic Ru nano-particle catalyst in bisphenol A hydrogenation reaction. The catalyst is prepared by dissolving a ruthenium salt precursor, mixing the ruthenium salt precursor with a surfactant containing nitrogen, phosphorus or sulfur, and reacting through a reducing agent in an inert atmosphere. The preparation method is simple and efficient, and reduction-modification coupling is realized in one step. Different from a traditional supported Ru catalyst, active sites of the carrier-free hydrophobic Ru nanoparticle catalyst are fully exposed, the particle size distribution uniformity of nanoparticles is excellent, and the dynamic light scattering PDI is smaller than or equal to 0.19. In the bisphenol A hydrogenation reaction, the raw material conversion rate reaches 95% or above, the selectivity of the target product hydrogenated bisphenol A reaches 95% or above, the conversion rate and the selective attenuation rate are both smaller than 5% after 5 cycles, and excellent cycle stability is achieved.

The application provides a preparation of a composite carrier catalyst and application thereof, and comprises the following steps: S1, first ball milling of an active raw material, wherein a binder is added in the first ball milling process to obtain component A, and the catalyst carrier comprises alumina, cerium oxide and lanthanum oxide; a plurality of catalyst carriers are mixed and then subjected to second ball milling, wherein nitric acid solution is added in the second ball milling process to obtain component B, and component A and component B are mixed and subjected to third ball milling to obtain a mixture; S2, the mixture is subjected to kneading and granulation, and the granulated material is calcined to obtain a precursor; and S3, the precursor is subjected to reduction and passivation to obtain the composite carrier catalyst. The application loads the active raw material through a multi-stage ball milling process, and the loading amount of the active component of the obtained catalyst is far higher than that of the impregnation method, and meanwhile, the defects caused by the introduction of impurities due to the use of lye in the coprecipitation method are completely avoided, so that the advantages of high loading amount and high purity are combined, and the obtained catalyst has excellent activity and stability, and the process is green and environmentally friendly.

The application discloses a dimethyl maleate hydrogenation catalyst and a preparation method and application thereof. The catalyst comprises CuO, Al2O3 and Mn oxide; the specific surface area of the catalyst is 40-70 m 2 / g; the catalyst is subjected to H2-N2O titration test, and the dispersion degree of metal Cu is 42-70%. The catalyst is used for hydrogenation of dimethyl maleate to prepare 1,4-butanediol, gamma-butyrolactone and tetrahydrofuran in combination, and has high conversion rate and target product selectivity.

The invention relates to the technical field of synthesis of organic chemical raw materials, in particular to an atomic-scale dispersion Ru catalyst which comprises a carrier and an active metal component, and the active metal component is ruthenium, is loaded on the surface of the carrier in an atomic-scale dispersion ruthenium cluster form and is combined with defects or vacancies on the surface of the carrier; wherein the carrier is a nano-diamond / graphene composite material with a core-shell structure, the composite material takes nano-diamond as a core and takes graphene rich in defects as a shell to form a carbon core and carbon shell hybrid core-shell structure, the nano-diamond / graphene composite material with a unique core-shell structure is preferably adopted as the carrier, and the nano-diamond / graphene composite material with the unique core-shell structure is used as the carrier; the hybrid diamond core provides excellent mechanical and thermal stability, while the hybrid graphene shell layer is rich in edge defects and vacancies that provide ideal, high density anchoring sites for the Ru species.

The invention relates to the technical field of cyclododecanol production, in particular to a method for inhibiting by-product cyclododecane in a cyclododecanol hydrogenation preparation process, which comprises the following steps: mixing one or more of cyclododecanone, epoxy cyclododecane or epoxy cyclododecene as raw materials with a solvent to prepare a raw material solution; the raw material liquid is subjected to a hydrogenation reaction, cyclododecanol is prepared, and the water content in the raw material liquid is 3-15 wt%. By adopting the technical scheme provided by the invention, on the premise of not changing the catalyst and the reaction system, the water content in the raw material liquid is controlled to be 3-15wt%, so that the water content of the reaction system in the reaction process is in a proper range, the generation of a byproduct cyclododecane can be effectively inhibited, and the yield of cyclododecanol is obviously improved; and the yield of the byproduct cyclododecane is reduced, so that the heat load of the tower kettle of the light component removal tower can be reduced by 20-50%.

Alicyclic alcohol represented by the following general formula (1).

The application provides a catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: first, a pore size adjustment treatment is performed on a spherical full-silicon molecular sieve carrier to obtain carriers with different pore size distributions; then, a CVD reaction is performed by using N2 to carry steam of molten Ni salt, Cr salt and Fe salt into a quartz tube filled with the dried carriers; then, the molecular sieve spheres after the reaction are calcined in N2 to obtain Ni-Cr-FeO x @Si-molecular sieve; and then, H2 or CO is used for reduction to obtain a Ni-Cr-Fe@Si-molecular sieve catalyst. The catalysts with different pore sizes are mixed in a specific proportion and then applied to a BYD fixed-bed hydrogenation process for preparing BDO, and the hydrogenation activity and product selectivity are high, the selectivity for BDO can reach > 99%, the amount of butanol generated is < 0.9%, and the amount of TBA generated is < 0.1%.

The invention discloses a method for efficiently and continuously hydrogenating and synthesizing hydrogenated bisphenol A through an ultrasonic-assisted microreactor, and belongs to the technical field of chemical reaction engineering. Aiming at the problems of easy excessive hydrogenation of products and many byproducts caused by slow multiphase mass transfer speed and long reaction time in the hydrogenated bisphenol A synthesis process, the invention adopts an ultrasonic-assisted microreactor technology to further enhance the gas-liquid-solid three-phase mass transfer efficiency, reduce the reaction time and temperature, and improve the yield of hydrogenated bisphenol A. Therefore, high-efficiency hydrogenation is realized under mild conditions, and the product yield and safety are improved. Compared with a common hydrogenation reactor, the method is based on an ultrasonic-assisted microreactor strengthening strategy, the reaction time is shortened to be within 2 minutes, complete conversion of raw materials is achieved, and the product purity is higher than 99%. The method provided by the invention realizes continuous and automatic operation of bisphenol A hydrogenation reaction, has remarkable economical efficiency, green environmental protection property and safety, and is suitable for large-scale industrial production.

The invention relates to a nickel-based hydrogenation catalyst and a preparation method and application thereof, and relates to the technical field of catalyst preparation. The preparation method of the nickel-based hydrogenation catalyst comprises the following steps: mixing an aluminum salt and a precipitant in water, and carrying out a neutralization gelling reaction to obtain a precipitate slurry; mixing the precipitation slurry, organic acid magnesium salt and organic acid lanthanum salt, and carrying out aging reaction to obtain modified aluminum oxide powder; mixing the modified aluminum oxide powder, a peptizing agent and an extrusion aid, performing extrusion molding, and performing drying and roasting to obtain a catalyst carrier; nickel salt and organic acid cerium salt are mixed in water to prepare impregnation liquid, the catalyst carrier is impregnated with the impregnation liquid, and the nickel-based hydrogenation catalyst is obtained through drying and roasting. The nickel-based hydrogenation catalyst has good stability and carbon deposition resistance, has good catalyst activity and selectivity, can be applied to preparation of 2-propyl heptanol, and effectively improves the hydrogenation reaction conversion rate and the target product selectivity.

The invention relates to a method and a system for continuously producing 1, 4-cyclohexanedimethanol, and belongs to the technical field of preparation of 1, 4-cyclohexanedimethanol. The problems of high raw material price, expensive catalyst, low production efficiency, harsh reaction conditions and the like in the existing 1, 4-cyclohexanedimethanol production process are solved. The method comprises the following steps: chloridizing p-xylene to prepare p-xylylene dichloride, hydrolyzing the p-xylylene dichloride to prepare terephthalyl alcohol, and hydrogenating the terephthalyl alcohol to prepare the 1, 4-cyclohexanedimethanol. The method takes p-xylene as a raw material, and is high in production efficiency, good in product quality, green, environment-friendly and low in energy consumption.

The application discloses an electrochemical double hydrogenation three-cell system, which comprises a chemical cell, an anode cell, a cathode cell, an ion exchange film, a palladium film, and a power supply; the palladium film serves as an anode electrode, and a first nano-porous palladium alloy catalyst is coated on one side of the surface of the palladium film; a cathode electrode is arranged in the cathode cell, and the cathode electrode is a second nano-porous palladium alloy catalyst; the system generates adsorbed hydrogen by electro-oxidation of a second organic substrate in the anode cell on the surface of the palladium film through the anode electrode; the adsorbed hydrogen is transferred to the chemical cell through the characteristics of the palladium film body phase hydrogen transfer, and the hydrogenation of the organic substrate is realized on the surface of the first nano-porous palladium alloy catalyst; meanwhile, the cathode electrode generates adsorbed hydrogen by hydrolysis on the surface of the second nano-porous palladium alloy catalyst to realize the hydrogenation of the organic substrate, and finally the electrochemical double hydrogenation of the organic matter is realized; experimental results show that when the three-cell system is applied to organic hydrogenation, the faraday efficiency is as high as 200%, and meanwhile, the system has excellent stability and ultralow energy consumption.

A fragrance composition containing an alicyclic alcohol represented by Formula (1) below as an active ingredient. Provided are a fragrance composition containing, as an active ingredient, an alicyclic alcohol that can impart a smooth, clear and natural muguet scent to the fragrance composition, having a transparent, smooth, clear and natural muguet scent, and also having a clean green floral scent; use of the alicyclic alcohol as a fragrance; and an alicyclic alcohol composition containing the alicyclic alcohol and an isomer thereof.

The invention relates to the technical field of organic synthesis, and discloses a preparation process of high trans o-tert-butyl cyclohexanol, which is characterized in that o-tert-butyl phenol is used as a raw material, palladium on carbon is used as a catalyst, and o-tert-butyl cyclohexanol is prepared through catalytic hydrogenation reaction; the method specifically comprises the steps of raw material input, catalyst addition, reaction condition control, sampling detection and the like, the content of trans-o-tert-butyl cyclohexanol in the product reaches 45% or above by precisely regulating and controlling the reaction temperature, the hydrogen pressure and the reaction time, and the total purity of the product reaches 99.9%. According to the invention, palladium on carbon is used as a core catalyst, the catalytic activity is high, the selectivity is strong, the generation proportion of trans-isomers is effectively improved, the process steps are simple, the operation is controllable, and the method is suitable for industrial large-scale production.

The application relates to a preparation method and application of a Ni / C catalyst, in particular to application of the Ni / C catalyst in hydrogenation of o-cresol into o-methylcyclohexanol, and belongs to the technical field of preparation of catalytic hydrogenation catalysts. The Ni / C catalyst used in the reaction system is obtained through one-step pyrolysis by taking Ni-BTC as a self-sacrificial template. The preparation raw material of the Ni / C catalyst is extensive, the price is low, the whole catalyst preparation process is simple, convenient and controllable, and the Ni / C catalyst is suitable for large-scale preparation. The Ni / C catalyst with high catalytic activity and selectivity is in-situ formed through pyrolysis at a lower temperature, the catalyst stability is very good, no obvious deactivation phenomenon is generated after 7 cycles of reaction, and the catalyst is easy to be separated through magnetic adsorption after the catalytic reaction is completed due to the magnetism of the catalyst, and the catalyst is convenient to recycle.

The present invention refers to a process for preparing an enantiomeric pure Diels-Alder Adduct, in particular a santalol derivative, i.e. (-)-(Z)-β-santalol.

The invention discloses a heat-resistant bio-based degradable polyester material and a preparation method of the heat-resistant bio-based degradable polyester material, and belongs to the field of bio-based high polymer materials. Two brand-new bio-based modified compounds are introduced, wherein one compound is diol with a bicyclic structure prepared by reacting bio-based vanillin with epichlorohydrin and carrying out hydroboration-oxidation, and the other compound is binary acid with an imidazole ring generated by hydrogenating bio-based itaconic acid and condensing the hydrogenated bio-based itaconic acid with ethylenediamine. The preparation method comprises the following steps: melting and mixing 1, 4-butanediol, adipic acid and two modified compounds, adding a catalyst and a nucleating agent, carrying out condensation polymerization under a high-temperature vacuum condition, and drying to obtain the polyester material. According to the material, the heat resistance is synergistically improved through the rigidity of a double-ring structure and the polarity of an imidazole ring, and the material is clear in bio-based source, can be completely biodegraded and is suitable for the fields of high-temperature packaging, degradable meal boxes and the like.

The invention relates to a method for preparing 1, 4-butanediol. The method can include reacting a solution comprising 1, 4-butynediol with hydrogen in the presence of an effective amount of a catalyst. The catalyst may comprise copper.

The invention discloses a catalyst as well as a preparation method and application thereof, and belongs to the technical field of chemical engineering. The method comprises the following steps: obtaining a solution containing a first active substance, wherein the solution comprises a first solution containing a titanium-based complex and / or a second solution containing a copper-based complex; reacting the titanium-based precursor, a complexing agent and water to obtain a first solution containing a titanium-based complex; reacting the copper-based precursor, a compounding agent and water to obtain a second solution containing a copper-based complex; mixing a ZSM molecular sieve, a cerium source, an acidic modifier and a solvent to obtain a third solution; adding a regulating agent into the third solution, and performing primary roasting to obtain a carrier loaded with the regulating agent; and mixing the carrier and the solution containing the first active substance to form a mixture, carrying out molding treatment on the mixture, and carrying out secondary roasting to obtain the catalyst. The catalyst provided by the invention can improve the catalytic activity and selectivity of a cyclized product, is long in service life, can be used repeatedly and is simple to recover, and the selectivity of the catalytic performance of selective hydrogenolysis of a C-O-C bond into linear alcohol reaches 98% or above.

The present invention relates to a process for recycling a solid rubber-based material, a recycling unit for carrying out said process. The present invention further relates to a process a process for manufacturing a solid rubber-based material, preferably a tire, using a product obtainable or obtained by the aforementioned process and a recycling process for preparing a pyrolysis oil from a solid rubber-based material obtained from the aforementioned process.

The invention discloses a preparation method of a high-activity bisphenol A hydrogenation catalyst, which comprises the following steps: weighing transition metal salt in the fourth period of the periodic table of elements, adding a mixed solvent of alcohol and deionized water, and uniformly stirring to prepare a uniformly mixed solution; weighing a ruthenium-containing compound, adding an accelerant, and adding deionized water to prepare a uniform solution; uniformly mixing the solutions, and reacting to obtain a reaction solution; weighing aluminum oxide, and adding the reaction liquid into the aluminum oxide to complete the impregnation process; then carrying out heat treatment to obtain a hydrogenation catalyst precursor; and reducing the hydrogenation catalyst precursor to obtain the reduced high-activity bisphenol A hydrogenation catalyst. According to the preparation method, the metal utilization rate of Ru is increased, and the catalytic activity of the catalyst is facilitated.

This invention discloses a copper-chromium catalyst, its preparation method, and its application. The preparation method of the catalyst includes: (1) mixing polylactic acid with dichloromethane and ethanol to obtain a polymer solution, adding a soluble copper salt to it, stirring, and obtaining a spinning solution; (2) using a coaxial electrospinning nozzle to perform electrospinning with the obtained spinning solution, and collecting the obtained solid; (3) placing the obtained solid in an ethanol solution of trimesic acid to react, washing and drying after the reaction, and collecting the obtained solid; (4) dissolving a soluble chromium salt in ethanol and reacting it with the obtained solid, then washing and drying, and collecting the obtained catalyst precursor; (5) calcining the obtained catalyst precursor to obtain an unformed catalyst, then pressing it into tablets to obtain the copper-chromium catalyst. This catalyst can improve the conversion rate and selectivity of the catalyst in the hydrogenation of dimethyl maleate to prepare 1,4-butanediol and co-production of γ-butyrolactone and tetrahydrofuran.