109 results about "Hydrogenation catalysis" patented technology

The invention belongs to the technical field of lubricating oil processing, and particularly relates to lubricating oil hydrofining equipment which comprises a high-pressure tank, a high-pressure pump, an oil inlet pipe and a hydrogen inlet pipe. The output end of the oil inlet pipe and the output end of the hydrogen inlet pipe are both located on the lower portion of a hydrogenation cavity of the high-pressure tank, the spiral plate is installed in the middle of the hydrogenation cavity of the high-pressure tank, a hydrogenation catalyst is arranged on the surface of the spiral plate, and the permeable membrane separation barrel is installed on the upper portion of the hydrogenation cavity of the high-pressure tank; a permeable membrane for hydrogen and waste gas to enter is arranged on the outer wall of the permeable membrane separation barrel, the input end of the exhaust pipe extends into the permeable membrane separation barrel, the output end of the exhaust pipe is connected with the sucking pump, the input end of the oil outlet pipe extends into the upper part of the hydrogenation chamber of the high-pressure tank, and the output end of the oil outlet pipe is provided with a pressure limiting valve; hydrogenation mixing, hydrogenation refining and oil-gas separation are carried out in a high-temperature and high-pressure tank body, the integration level is high, the energy consumption is low, and the refining efficiency is high.

The invention discloses a preparation method and application of a carbon dioxide hydrogenation catalyst, and belongs to the field of hydrogenation catalysis. The vanadium slag is used as a raw material, a leaching solution containing silicon, chromium and vanadium is obtained through sodium salt roasting, an aluminum source is added to remove the silicon element, meanwhile, an ordered mesoporous carbon material is added, and silicon and aluminum elements are converted into an ordered mesoporous composite oxide which is used as a hydrogenation catalyst carrier; an indium salt, a cerium salt and a nickel salt are dissolved in ethanol and mixed with the carrier for isopyknic impregnation to obtain the hydrogenation catalyst; and carrying out chromium and vanadium separation on the silicon-removed leaching solution to obtain chromium sesquioxide and the all-vanadium redox flow battery electrolyte. The catalyst has a regular pore structure, ordered mesopores provide a confinement effect, dispersion and anchoring of active components are facilitated, and the activity of the catalyst is remarkably improved.

The invention relates to the technical field of biology, in particular to a carbonyl reductase mutant, a gene, an engineering bacterium and application. The amino acid sequence of the carbonyl reductase mutant is shown as SEQ ID NO: 1, the catalytic efficiency of asymmetric reductive hydrogenation of prochiral ketone compounds is improved, the stereoselectivity of chiral hydroxyl compounds formed through catalysis is improved, and the synthesis efficiency of (S)-1-(5-fluoro-2-iodophenyl) ethanol is improved.

A carbon dioxide (CO2) hydrogenation catalyst and a method of its preparation. The CO2 hydrogenation catalyst includes an alkali-metal enriched bauxite residue including calcium carbonate (CaCO3), iron(III) oxide (Fe2O3), iron(III) oxyhydroxide (FeO(OH)), aluminum hydroxide (Al(OH)3), sodalite, muscovite, and Na5Al2CSi3O15. The CO2 hydrogenation catalyst further includes 1 weight percent (wt. %) to 10 wt. % potassium based on a total weight of the CO2 hydrogenation catalyst by inductively coupled plasma optical emission spectroscopy (ICP-OES). The CO2 hydrogenation catalyst is used in a method of hydrogenating carbon dioxide to produce olefins.

This invention discloses a mesophase pitch-polyacrylonitrile blend, its preparation method, and its applications, belonging to the field of carbon fiber preparation technology. The preparation method includes: treating coal-based pitch at high temperature, followed by solvent extraction, solvent removal, and hydrogenation catalysis to obtain mesophase pitch; heating the mesophase pitch to 200-230°C under an inert atmosphere, then adding polyacrylonitrile microspheres and melt-blending to obtain the mesophase pitch-polyacrylonitrile blend. This method can obtain a stable single-phase system of mesophase pitch and polyacrylonitrile microspheres, forming a homogeneous blend. The comprehensive performance of pitch-based fibers and pitch-based carbon fibers further prepared using this blend is significantly improved. The tensile strength of the pitch-based carbon fibers is above 4500 MPa, and the elongation at break is above 1.2%, effectively solving the defects of low strength and brittleness in traditional pitch-based carbon fibers.

A method for producing 2,5-dimethylfuran according to one embodiment of the present invention includes a step for reacting a furan compound having a specific structure with hydrogen in a non-aqueous solvent in the presence of a hydrogenation catalyst. In this method for producing 2,5-dimethylfuran, the hydrogenation catalyst includes at least one type selected from among a first component group and at least one type selected from among a second component group. The first component group includes chromium, molybdenum, manganese, rhenium, ruthenium, rhodium, iridium, nickel, palladium, platinum, copper, zinc, and the like. The second component group includes aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, carbon, and the like.

The specification describes a process for the upgrading of ketones, comprising the step of reacting a ketone and hydrogen together in the presence of a catalyst system comprising either a condensation catalyst and a separate hydrogenation catalyst, or a condensation catalyst on which a transition metal is supported. The condensation catalyst is a mixed oxide material comprising aluminium, calcium and optionally magnesium, and has a Ca:(Mg+Al) weight ratio of 0.25 ≤ Ca:(Mg+Al) ≤ 2.5 and a Mg:Al weight ratio of 0 ≤ Mg:Al ≤ 3.0. The process is particularly suitable for the upgrading C3, C4 or C5 ketones such as acetone or butanone.

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.

A process of carrying hydrogen on a hydrogen carrier is disclosed. The process comprises hydrogenating a hydrocarbon feed stream in a hydrogenation reactor in the presence of hydrogen and a hydrogenation catalyst to produce a hydrogenated stream for carrying hydrogen. The hydrogenated stream is contacted with a dehydrogenation catalyst to produce a dehydrogenated stream. The dehydrogenated stream is fractionated in a fractionation column to produce a fractionation column overhead stream comprising C7− hydrocarbons and a fractionation column bottoms stream. The hydrocarbon feed stream comprising about 1 to about 10 wt % C12 to C16 hydrocarbons can be taken from the fractionation column bottoms stream. A hydrocarbon composition comprising about 1 to about 10 wt % C12 to C16 hydrocarbons and at least about 80 wt % toluene is also disclosed.

A silicone elastomer composition contains the following components: (a) hydroxyl-functional polyorganosiloxane gum; (b) pendant alkenyl-functional polyorganosiloxane gum; (c) silylhydride-functional crosslinker containing an average of at least 2 SiH groups per molecule; (d) hydrosilylation catalyst; (e) hydrosilylation inhibitor; (f) solvent; (g) optionally, terminal alkenyl-functional polyorganosiloxane gum that is free of pendant alkenyl groups; and (h) optionally, tetraalkoxysilane; where: (i) the silicone elastomer composition is free of MQ resin; (ii) the weight ratio of components (a) / (b) is in a range of 0.1 to 10; (iii) the mole ratio of (SiH) / (C＝C) is in a range of one to 20; and (iv) the weight percent of alkenyl groups relative to total weight of components (a), (b) and (g) is in a range of 0.035 to 1.00.

A process for preparing a clustered epoxy silicone with the following steps: (a) conduct a hydrosilylation reaction between the following reactants in the presence of a platinum-based hydrosilylation catalyst to form a SiH-functional siloxane intermediate: (i) an alkenyl functional siloxane with 2 or more silicon-bound alkenyl groups per molecule; and (ii) a cyclic SiH-functional siloxane with 4 or more SiH groups per molecule; (b) add thiuram disulfide at a concentration at least twice that of platinum from step (a); (c) strip unreacted SiH-functional siloxane at a temperature at or below 120 °C to obtain a stripped reaction product of SiH-functional siloxane intermediate and inhibited platinum; (d) optionally, combining the stripped reaction product with a non-platinum hydrosilylation catalyst and an alkenyl-functional epoxide; and (e) heat to 80-120 °C to facilitate a hydrosilylation reaction between the SiH-functional siloxane intermediate and the alkenyl-functional epoxide to produce a clustered epoxy silicone.

The present application relates to the field of new materials, in particular to a hydrogenation catalyst composition, a hydrogenated bio-based itaconate rubber, and a preparation method and application thereof.The hydrogenation catalyst composition provided by the present application comprises a hydrogenation catalyst and a ligand; the mass amount of the ligand is 1-20 times that of the hydrogenation catalyst.The present application first uses a homogeneous noble metal complex catalyst composition to perform solution hydrogenation on bio-based itaconate rubber, and has the advantages of less catalyst consumption, high hydrogenation activity and high hydrogenation degree.The polymer after hydrogenation is a novel polymer material, the hydrogenation degree can reach more than 90%, has excellent heat resistance, aging resistance, and excellent processability and physical and mechanical properties, and has a wide application prospect.In the test of the present application, the bio-based itaconate rubber is hydrogenated in an organic solvent by using the hydrogenation catalyst composition of the present application, and the hydrogenation degree reaches 97.2% at the highest.

The present invention relates to the technical field of chemical synthesis, and provides a method for synthesizing 5-chloro-2-(2-chloroethoxy)benzenesulfonamide. The method comprises: performing an amination reaction on 5-chloro-2-(2-chloroethoxy)benzenesulfonyl chloride and aqueous ammonia to obtain 5-chloro-2-(2-chloroethoxy)benzenesulfonamide. The above technical solution solves the problems of incomplete amination, unstable product quality, and subsequent deactivation of a hydrogenation catalyst in the production process of 5-chloro-2-(2-chloroethoxy)benzenesulfonamide in the related art, while also solving the problems of low product yield and high production and processing costs.

The invention relates to the technical field of biology, in particular to a remegapam intermediate precursor ketoreductase mutant, engineering bacteria and application. According to the remegapam intermediate precursor ketoreductase mutant, the engineering bacteria and the application of the remegapam intermediate precursor ketoreductase mutant, the amino acid sequences of the remegapam intermediate precursor ketoreductase mutant are shown as SEQ ID NO: 1-SEQ ID NO: 5, and the stereoselectivity of asymmetric reduction hydrogenation catalysis on remegapam intermediate precursor ketoreductase is improved; the R-type remegapam intermediate with high chiral purity is obtained, and the synthesis efficiency of the remegapam intermediate is improved.

A system including an absorption column configured to receive an acetylene-rich gas stream flowing upwards and a cooled acetylene-lean solvent stream flowing downwards to generate an acetylene-lean gas effluent and an acetylene-rich solvent effluent, one or more heat exchangers for receiving the acetylene-rich solvent effluent, the one or more heat exchangers being configured to transfer heat to the acetylene-rich solvent effluent to generate a heated acetylene-rich solvent stream, and one or more hydrogenation reactors each having one or more catalyst beds, wherein at least a first one of the one or more hydrogenation reactors is configured to convert at least a portion of acetylene in the heated acetylene-rich solvent stream to ethylene in the presence of a first hydrogenation catalyst and hydrogen under first hydrogenation reaction conditions to generate a first hydrogenation effluent including ethylene and a first acetylene-lean solvent effluent.

This invention discloses a technical field of lubricating oil processing, particularly relating to a lubricating oil hydrorefining equipment, comprising a high-pressure tank, a high-pressure pump, an oil inlet pipe, and a hydrogen inlet pipe; it also includes a spiral plate, a permeate membrane separator, an exhaust pipe, a vacuum pump, and an oil outlet pipe. The output ends of the oil inlet pipe and the hydrogen inlet pipe are both located in the lower part of the hydrogenation chamber of the high-pressure tank. The spiral plate is installed in the middle of the hydrogenation chamber of the high-pressure tank, and a hydrogenation catalyst is disposed on the surface of the spiral plate. The permeate membrane separator is installed in the upper part of the hydrogenation chamber of the high-pressure tank, and a permeate membrane for hydrogen and waste gas to enter is disposed on the outer wall of the permeate membrane separator. The input end of the exhaust pipe extends into the interior of the permeate membrane separator, and the output end of the exhaust pipe is connected to the vacuum pump. The input end of the oil outlet pipe extends into the upper part of the hydrogenation chamber of the high-pressure tank, and a pressure limiting valve is disposed at the output end of the oil outlet pipe. Hydrogenation mixing, hydrogenation refining, and oil-gas separation are carried out in a high-temperature and high-pressure tank, with high integration, low energy consumption, and high refining efficiency.

The invention discloses a preparation method and application of a Ni / CeO2 / C catalyst with hindered Lewis acid-base pairs (FLPs), the mass fraction of Ce is 5%-13.5% on the basis that the mass of the catalyst is 100%, and the preparation method comprises the following steps: 1) respectively preparing a solution A containing cerium nitrate and nickel nitrate and a solution B containing terephthalic acid; (2) mixing and stirring the solution A and the solution B, and then transferring the solution A and the solution B into a high-pressure reaction kettle with a polytetrafluoroethylene lining for heating reaction; and 3) calcining the obtained solid at a high temperature in an N2 atmosphere, and finally performing high-temperature reduction treatment in a hydrogen / argon mixed atmosphere. The catalyst is low in preparation cost and mild in preparation condition. The Ni / CeO2 / C catalyst with FLPs provided by the invention has better performance on hydrogenation catalysis of alpha, beta-unsaturated aldehyde, and realizes conversion of unsaturated aldehyde into an intermediate product with higher value.

A process for the preparation of N-methylmorpholine comprising continuously feeding morpholine, a formaldehyde solution and hydrogen to at least one reactor containing a heterogeneous hydrogenation catalyst comprising cobalt and copper, and subjecting the morpholine and formaldehyde to reductive amination to obtain N-methylmorpholine wherein the fed formaldehyde solution is a formaldehyde methanol solution.

The invention relates to a process for L-Iditol by hydrogenating L-Sorbose. Further, the invention also relates to a use of a transition metal complex as hydrogenation catalyst for L-Sorbose. The invention relates to a process for the preparation of L-Iditol comprising at least one reaction step, in which a composition comprising L-Sorbose and hydrogen is reacted in the presence of a transition metal catalyst complex in a homogeneous solution, wherein the transition metal catalyst complex comprises at least one chiral ligand containing at least one phosphorus atom, which is capable of coordinating to the transition metal, and wherein the transition metal is selected from metals of groups 8, 9 and 10 of the periodic table of the elements according to IUPAC. The invention further relates to a use of a transition metal complex as defined above and below as hydrogenation catalyst for compositions comprising L-Iditol or mixtures thereof.

The present invention relates to a method of producing adipic acid, including a step (hydrogenation step) of reacting 3-hydroxyadipic acid-3,6-lactone with hydrogen in an aqueous solvent in a presence of a hydrogenation catalyst. The hydrogenation catalyst preferably includes one kind or two or more kinds of transition metal elements selected from the group consisting of palladium, platinum, ruthenium, rhodium, rhenium, nickel, cobalt, iron, iridium, osmium, copper, and chromium.

The present invention relates to a method for recovering and reusing a selective homogeneous hydrogenation catalyst. The present invention relates to a method for recovering a selective homogeneous hydrogenation catalyst from a second reaction resolution in which a synthesis of cyclododecene is completed after synthesizing the cyclododecene by selective hydrogenation of a first reaction solution containing cyclododecatriene, triphenylphosphine, formaldehyde, and ruthenium chloride, and the method includes: preparing the selective homogeneous hydrogenation catalyst from the triphenylphosphine, the formaldehyde, and the ruthenium chloride during the selective hydrogenation of the first reaction solution, and synthesizing the cyclododecene; mixing a solvent containing cyclododecanone with the first reaction solution; and recovering the selective homogeneous hydrogenation catalyst through evaporation separation from the second reaction solution in which the synthesis of the cyclododecene is completed.

A system including an absorption column configured to receive an acetylene-rich gas stream flowing upwards and a cooled acetylene-lean solvent stream flowing downwards to generate an acetylene-lean gas effluent and an acetylene-rich solvent effluent, one or more heat exchangers for receiving the acetylene-rich solvent effluent, the one or more heat exchangers being configured to transfer heat to the acetylene-rich solvent effluent to generate a heated acetylene- rich solvent stream, and one or more hydrogenation reactors each having one or more catalyst beds, wherein at least a first one of the one or more hydrogenation reactors is configured to convert at least a portion of acetylene in the heated acetylene-rich solvent stream to ethylene in the presence of a first hydrogenation catalyst and hydrogen under first hydrogenation reaction conditions to generate a first hydrogenation effluent including ethylene and a first acetylene-lean solvent effluent.

A process of hydrogenating a hydrocarbon stream is disclosed. The process comprises passing a dehydrogenated feed stream to a hydrogenation reactor. A hydrogen stream is passed to the hydrogenation reactor. In the hydrogenation reactor, the dehydrogenated feed stream is hydrogenated in the presence of hydrogen and a hydrogenation catalyst to produce a hydrogenated effluent stream comprising methylcyclohexane. The hydrogenated effluent stream is cooled by indirect heat exchange with an organic heat exchange fluid stream to provide a vaporized organic heat exchange fluid stream. The vaporized organic heat exchange fluid stream is expanded to provide electrical power. A product stream is separated from a cooled hydrogenated effluent stream.

A method for upgrading heavy oil by using a coke production byproduct comprises the steps of: producing a mixed solution by mixing a coke production byproduct and heavy oil; and hydrogenating the mixed solution under a hydrogenation catalyst, wherein the present disclosure is economical and effective by being able to reduce the amount of coke formation and significantly reduce the partial pressure of added hydrogen by using the coke production byproduct as a hydrogen donor.

The invention relates to the technical field of hydrogenation catalysis, and discloses a hydrofining catalyst as well as a preparation method and application thereof. The hydrofining catalyst contains a composite carrier, an active metal oxide and a non-metal auxiliary agent, and the content of the composite carrier is 54-98 wt%, the content of the active metal oxide is 1-40 wt%, and the content of the non-metal auxiliary agent is 0.5-6 wt% based on the total weight of the hydrofining catalyst, the composite carrier contains aluminum oxide and / or silicon oxide, cerium oxide and a metal additive; the active metal oxide is at least one of molybdenum oxide, tungsten oxide, cobalt oxide and nickel oxide; the non-metal additive is phosphorus oxide and / or boron oxide; the metal additive is selected from at least one of zinc oxide, iron oxide, manganese oxide, copper oxide and magnesium oxide. The hydrofining catalyst is high in hydrogenation efficiency and long in service life, and a product obtained after two-stage hydrogenation is ultralow in sulfur and low in bromine value.

The present invention relates to a process of hydrogenating an alkyne selectively to an alkene by hydrogen using a hydrogenation catalyst which is palladium supported on a carrier in the presence of an additive mixture of an organic phosphorus compound (AP) and an organic sulphur compound (AS).

The application discloses a kind of rich vacancy molybdenum disulfide catalyst and preparation method and purposes, and preparation method is as follows:1) according to the proportion of 1-5mg / mL, molybdenum disulfide powder is mixed with deionized water, and molybdenum disulfide water dispersion is obtained;2) molybdenum disulfide water dispersion obtained in step 1) is loaded into the hydrothermal kettle with polytetrafluoroethylene lining, and sealed;Hydrothermal reaction is carried out at 140-190 DEG C for 4-20h;Drop to room temperature, centrifugal, dry, and obtain rich vacancy molybdenum disulfide catalyst.The method of the application is simple, efficient, green and pollution-free, and easy to scale up.The rich vacancy molybdenum disulfide catalyst prepared by the application has rich active sites, and the catalytic activity in the field of substituted nitrobenzene hydrogenation can be significantly improved due to the increase of active site sulfur vacancy, which is used for the hydrogenation catalysis of p-chloronitrobenzene, and the conversion rate of p-chloronitrobenzene is 100%, and the selectivity of p-chloroaniline is 100%.The performance of the catalyst exceeds that of raw material molybdenum disulfide.

A process of hydrogenating an unsaturated hydrocarbon is disclosed. The process comprises passing a hydrocarbon feed stream comprising toluene to a hydrogenation reactor. A hydrogen stream is passed to the hydrogenation reactor. In the hydrogenation reactor, the hydrocarbon feed stream is hydrogenated in the presence of hydrogen and a hydrogenation catalyst to produce a hydrogenated effluent stream comprising methylcyclohexane. The hydrogenated effluent stream is indirectly contacted with a water stream to produce a steam stream. The steam stream is taken from the hydrogenation reactor. In an electrolyzer, hydrogen is separated from the steam stream to produce the hydrogen stream which is passed to the hydrogenation reactor.

The invention discloses a method for efficiently preparing an environment-friendly refrigerant R-1234yf, and relates to the field of preparation of refrigerants. The method comprises the following steps: introducing 1, 2, 3, 3, 3-pentafluoropropylene and hydrogen into a fixed bed reactor, and reacting in the presence of a hydrogenation catalyst at set temperature and pressure to generate pentafluoropropane; performing HF elimination reaction on the pentafluoropropane under high-temperature catalysis to generate an environment-friendly refrigerant R-1234yf; and introducing the R-1234yf into a rectifying tower for rectifying, separating and purifying to obtain the high-purity R-1234yf. The invention provides an efficient, environment-friendly and controllable R-1234yf preparation method, the requirements of the modern refrigeration field on green and environment-friendly refrigerants are met, and the production efficiency and economical efficiency are remarkably improved.

The invention relates to a method for synthesising methanol via catalytic hydrogenation of carbon dioxide, the method comprising at least one step (E1) in which, within a reactor that comprises at least one first reaction chamber (1) provided with at least one first inlet (10) and at least one first outlet (80, 90): - a gas stream containing carbon dioxide CO2 and dihydrogen H2 flows from the first inlet (10) of the first reaction chamber to the first outlet (90) of the first reaction chamber; and - a hydrogenation catalyst (30, 40, 50, 60) is contained in the first reaction chamber, between the first inlet (10) and the first outlet (80, 90), in the form of a fixed bed of catalyst, whereby at least part of the carbon dioxide CO2 and dihydrogen H2 of the gas stream is converted into methanol and water during step (E1), characterised in that, during step (E1): • the pressure is 20 MPa (200 bar) or higher; and • the inlet velocity of the gas stream into the first reaction chamber (1) is at least 0.4 cm / s; and • the first reaction chamber (1) is provided with at least one second outlet (70) through which the water and the methanol, produced in the liquid state, are driven by gravity.