83 results about "Hydrogenation catalysis" patented technology

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 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 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).

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.

The application relates to the field of biotechnology, in particular to a remegpa intermediate precursor ketoreductase mutant, an engineering bacterium and application. The remegpa intermediate precursor ketoreductase mutant, the engineering bacterium and the application of the embodiment of the application, the amino acid sequence of the remegpa intermediate precursor ketoreductase mutant is shown in SEQ ID NO:1-SEQ ID NO:5, the stereoselectivity of the asymmetric reduction hydrogenation catalyzed by the remegpa intermediate precursor ketoreductase mutant is improved, the R-type remegpa intermediate with high chiral purity is obtained, and the synthesis efficiency of the remegpa intermediate is improved.

The application discloses application of a Mo / SiO2-Cu / ZnO / Al2O3 catalyst in preparation of ethanol through DMO hydrogenation catalysis, and Mo / SiO2 in the Mo / SiO2-Cu / ZnO / Al2O3 catalyst first catalyzes hydrogenation conversion of dimethyl oxalate into methyl acetate, and then Cu / ZnO / Al2O3 catalyzes hydrogenation conversion of the methyl acetate into ethanol. The Mo / SiO2-Cu / ZnO / Al2O3 catalyst is a two-stage filling catalytic system, and the filling modes include Mo-CuZnAl two-stage filling, Mo-mix-CuZnAl physical mixing filling and CuZnAl-Mo two-stage filling. The Mo / SiO2 catalyst and the Cu / ZnO / Al2O3 catalyst are simultaneously applied in preparation of ethanol through dimethyl oxalate hydrogenation synergistic catalysis, and the Mo / SiO2 catalyst and the Cu / ZnO / Al2O3 catalyst can exhibit stronger hydrogenation activity, excellent catalytic activity and higher ethanol selectivity.

The invention relates to a novel process for synthesizing ethyl (R)-(-)-4-cyano-3-hydroxybutyrate, which adopts 3-oxygen-glutaric acid monoethyl ester as a raw material and comprises the following steps of: 1, reacting the 3-oxygen-glutaric acid monoethyl ester as a raw material with a chlorination reagent to generate 4-formyl chloride ethyl acetoacetate; 2, enabling the 4-formyl chloride ethyl acetoacetate to react with an amination reagent to generate 4-formyl amino ethyl acetoacetate; 3, the 4-formamido ethyl acetoacetate and a dehydrating agent are subjected to a reaction, and 4-cyano ethyl acetoacetate is generated; and 4, reacting the 4-cyanoacetoacetic acid ethyl ester with hydrogen under the action of a hydrogenation catalyst to generate (R)-(-)-4-cyano-3-hydroxybutyric acid ethyl ester. According to the method, ethyl 3-oxoglutarate is innovatively adopted as a raw material, and the (R)-4-cyano-3-hydroxybutyrate meeting the quality standard is finally obtained through chlorination, amination, dehydration and chiral hydrogenation reaction. Sodium cyanide is not used as a cyaniding reagent, the amount of three wastes is small, reaction conditions are mild, and the method is suitable for industrial production.

The present invention relates to a hydrogenation catalyst, and more particularly to a hydrogenation catalyst that enables high selectivity and conversion in a hydrogenation reaction that converts a carboxylic acid functional group, an aldehyde functional group, or a ketone functional group into an alcohol functional group.

The present application relates to the technical field of bioengineering, in particular to a collagen peptoid and a preparation method and application thereof. The present application provides a method different from conventional solid-phase synthesis of collagen peptoids. The preparation method of the collagen peptoid provided only needs two-step reactions of polymerization (random polycondensation) and hydrogenation catalysis, and the reactions are carried out in a homogeneous solution, so that the preparation method is simple and suitable for large-scale industrialized preparation. Moreover, the structure of the collagen peptoid provided can be flexibly changed according to needs on the basis of different monomer proportions, and the target peptoid can be quickly prepared.

The invention discloses a method for preparing polyoxymethylene dimethyl ether in an anhydrous formaldehyde system, and belongs to the field of new energy synthetic fuel and environment-friendly solvent preparation. Aiming at the problems that a water-containing system in the prior art is low in reaction efficiency, separation of residual formaldehyde and formic acid is interfered, and environmental protection and economy are insufficient, the method comprises the following steps: P1, reacting anhydrous gas formaldehyde and methylal with the purity of more than or equal to 99.0% serving as raw materials in a radial flow fixed bed reactor under the catalysis of macroporous cation exchange resin at the temperature of 50-80 DEG C, the pressure of 0.2-0.6 MPa and the air speed of 0.4-1.0 h <-1 > to generate a product containing DMM2-6; under the hydrogenation catalysis of P2 non-supported NiMoW, hydrogenation is carried out at the temperature of 40-80 DEG C and the pressure of 1.0-4.0 MPa to remove aldehyde acid; the P3 is subjected to normal-pressure-reduced-pressure rectification to obtain DMM2 with the purity being larger than or equal to 98.0% and DMM3-6 with the purity being larger than or equal to 98.5%, and side line materials of the first rectification tower are recycled and reused. The formaldehyde conversion rate is greater than or equal to 92%, the DMM2-6 selectivity is greater than or equal to 98%, the product is free of sulfur-nitrogen aromatic hydrocarbons and waste lye, the energy consumption is low, and the raw material utilization rate is high.