194 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.

A selective hydrogenation catalyst that can be obtained by the process comprising at least the following steps:a) the alumina support is brought into contact with at least one organic additive;b) the alumina support is brought into contact with at least one nickel metal salt, the melting point of said metal salt of which is between 20° C. and 150° C.;c) the solid mixture obtained on conclusion of steps a) and b) is heated with stirring;d) the catalyst precursor on conclusion of step c) is dried;e) a step of heat treatment of the dried catalyst precursor obtained on conclusion of step d) is carried out.

The invention relates to the technical field of catalysts, and discloses a bifunctional catalyst, a preparation method thereof and a method for preparing CO through CO2 hydrogenation catalysis. The catalyst comprises a carrier, a metal component and a metal auxiliary agent, the metal component and the metal auxiliary agent are loaded on the carrier, the carrier is calcium oxide, the metal component is nickel oxide, and the metal auxiliary agent is selected from one or more of manganese oxide, zirconium oxide and cerium oxide. The invention provides a bifunctional adsorbent-catalyst which can selectively adsorb CO2 and catalyze CO2 into CO, and realizes integration of adsorption decarburization and catalytic regeneration. The bifunctional catalyst has a rich pore channel structure, catalytic reaction is facilitated, regulation and control of the structure and performance of the catalyst are achieved by adding different metal auxiliaries, the catalytic activity is more efficient, and meanwhile the stability and durability of the adsorption catalytic activity are guaranteed.

The invention belongs to the technical field of phenol hydrogenation catalysis, and discloses a nitrogen-doped porous carbon sphere loaded palladium-based catalyst as well as a preparation method and application thereof in order to solve the problems that active components of an existing catalyst are difficult to highly disperse, the reaction condition is harsh and the stability is poor. The nitrogen-doped porous carbon spheres derived from the nitrogen-doped polymer are used as carriers to load Pd, and high dispersion of Pd is promoted by N sites on the nitrogen-doped porous carbon spheres, so that the number of active centers is increased, and cyclohexanone can be prepared through phenol hydrogenation under mild conditions; and the interaction between the N site and the Pd metal hinders the loss of the active component, so that the high stability of the catalyst is realized. In addition, N sites on the nitrogen-doped porous carbon spheres can promote vertical adsorption of phenol molecules, so that high-selectivity preparation of cyclohexanone is realized.

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.

The invention belongs to the field of sandalwood 803 preparation, and particularly relates to a preparation method of sandalwood 803. Sandalwood 803 is continuously produced in a fixed bed under the catalytic action of a solid acid catalyst and a hydrogenation catalyst, phenol and camphene are catalyzed by the solid acid catalyst to be subjected to an alkylation reaction, a terpene-phenol mixture in an alkylation reaction product is catalyzed by the hydrogenation catalyst to be subjected to a hydrogenation reaction, and the sandalwood 803 is prepared. The hydrogenation catalyst is a cobalt-based catalyst containing lanthanide oxides. Compared with the prior art, the continuous process for synthesizing the sandalwood 803 has the advantages that the sandalwood 803 can be continuously and uninterruptedly synthesized by selecting and preparing the solid acid catalyst and the hydrogenation catalyst which are high in activity and good in stability, so that the production efficiency of the sandalwood 803 is improved, the production cost is reduced, and large-scale production is facilitated.

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 hydrogenation catalyst contains a hydrogenation catalyst carrier and an active hydrogenation component. The active hydrogenation component includes a Group VIB metal sulfide and a Group VIII metal compound, and the molar proportion of a substance of the Group VIII metal compound that interacts with the Group VIB metal sulfide to the total amount of the Group VIII metal compound is 60-100%. The hydrogenation catalyst has a higher active metal sulfurizing degree and a higher number of type II active centers, and can be applied to the hydrogenation treatment process of oil products such as distillate oils and residual oils.

The present disclosure generally relates to methods of producing syngas. In particular, the present disclosure relates to a process comprising: providing a first feed stream comprising H2 and CO2; contacting the first feed stream with a hydrogenation catalyst to form a first product stream comprising methanol; providing a second feed stream comprising at least a portion of the methanol of the first product stream; the second feed stream is contacted with a methanol decomposition catalyst to form a second product stream comprising syngas.

The invention belongs to the technical field of sugar alcohol catalyst utilization, and relates to a system and method for improving the recycling rate of a hydrogenation catalyst, and the system comprises a raw material metering tank, a hydrogenation reaction kettle, a hot water tank, a settling tank, a washing liquid tank, a dilute alkali tank, a filtering tank, a product tank, a catalyst regeneration tank and a catalyst metering tank, the settling tank is used for settling the cooled sugar alcohol hydrogenation liquid containing the hydrogenation catalyst so as to separate precipitates and supernate, the filtering tank is used for filtering the supernate so as to obtain the sugar alcohol hydrogenation liquid and filtrate, and the product tank is used for storing the filtered sugar alcohol hydrogenation liquid. And the catalyst regeneration tank is used for recovering the hydrogenation catalyst in the settling tank and the filtrate in the filtering tank, and regenerating the recovered hydrogenation catalyst. The catalyst metering tank is used for storing the regenerated hydrogenation catalyst and preparing a hydrogenation catalyst solution. Efficient recovery and regeneration of the hydrogenation catalyst in the maltose hydrogenation process are achieved, and the recovery rate of the hydrogenation catalyst is increased.

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.

The invention discloses preparation and application of a rare earth MOF (Metal Organic Framework)-based hindered Lewis acid-base pair for hydrogenation, and belongs to a preparation technology of a nano catalytic material. According to the preparation method, in the synthesis process of rare earth MOF, a proper amount of transition metal is introduced to serve as a doping agent, rare earth-transition bimetallic MOFs with adjustable defects and morphology are synthesized, and hindered Lewis acid-base pairs serving as active sites can be effectively used for DCPD hydrogenation. Through heteroatom doping and defect engineering technologies, RE-MOF lattice distortion is induced while a second metal active site is introduced, so that the catalytic performance of the material is improved. RE-X-BTC (wherein X represents a doped transition metal, and BTC represents trimesic acid) shows enhanced Lewis acid-base characteristics and hydrogen adsorption and desorption characteristics, and selective hydrogenation of a substrate is realized by precisely regulating and controlling reaction conditions. The implementation of the invention provides a new way for the application of the porous MOF in the field of hydrogenation catalysis.

The present invention relates to a method of producing ε-caprolactam, the method including the following steps (A) and (B): (A) a step of reacting 5-cyanovaleramide with hydrogen in an aqueous solvent in a presence of a hydrogenation catalyst to obtain a 5-cyanovaleramide hydrogenation reaction mixture; (B) a step of heating the 5-cyanovaleramide hydrogenation reaction mixture at a temperature of 180° C. or higher and 300° C. or lower in an aqueous solvent to obtain ε-caprolactam.

A method for producing 1,3-butanediol, the method comprising: a step for bringing a raw material liquid containing acetaldehyde into contact with a solid base catalyst and a hydrogenation catalyst to obtain a reaction liquid containing 1,3-butanediol, wherein the solid base catalyst includes at least one among metal elements having an atomic number of 12-20, and the hydrogenation catalyst includes Ni.

The present invention provides a [Ru(OAc)2(ligand)] catalyst of formula I, where R 1 is C 1~6 alkyl, and R 3 is hydrogen or C 1~6 alkyl, and R 4 is hydrogen or C 1~6 The [Ru(OAc)2(ligand)] catalyst is a versatile hydrogenation catalyst. TIFF2025525346000011.tif57128

A process for producing C10-C18 dialkyl cycloalkanes comprising : (i) subjecting a furfural compound, a furfuryl alcohol compound or a mixture of a furfural compound and a furfuryl alcohol compound to a reductive rearrangement reaction in the presence of water, hydrogen and hydrogenation catalyst comprising a supported transition metal to produce a reaction product comprising an active methylene-group containing cyclic ketone selected from cyclopentanone, substituted cyclopentanone, cyclohexanone or substituted cyclohexanone, and mixtures thereof; (ii) reacting the active methylene-group containing cyclic ketone obtained in step (i) with a furfural compound in an aldol condensation reaction in the presence of a catalyst to produce a reaction product comprising unsaturated C10-C18 oxygen-containing cyclic organic dimer and / or trimer compounds; (iii) subjecting the unsaturated C10-C18 oxygen-containing cyclic organic dimer and / or trimer compounds produced in step (ii) to a hydrogenation reaction in the presence of hydrogen and a hydrogenation catalyst in order to produce saturated C10-C18 oxygen-containing cyclic organic dimer and / or trimer compounds; and (iv) subjecting the saturated C10-C18 oxygen-containing cyclic organic dimer and / or trimer compounds produced in step (iii) to a hydrodeoxygenation step in the presence of hydrogen and a hydrodeoxygenation catalyst to produce a hydrocarbon product comprising C10-C18 dialkyl cycloalkanes, wherein the active methylene-group containing cyclic ketone is recovered from the reaction product produced in step (i) by subjecting the reaction product of step (i) to an azeotropic distillation step (ia) to produce a distillate stream comprising a major portion of the active methylene-group containing cyclic ketone and a bottom stream comprising a major portion of water and a minor portion of the active methylene-group containing cyclic ketone, wherein said distillate stream is used as feed in step (ii).

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.

In a first aspect, the present invention relates to a hydrogenation process for converting a compound comprising reacting the compound in a liquid medium with hydrogen in a reaction vessel included in a reaction apparatus in the presence of a heterogeneous hydrogenation catalyst, the method comprises: (i) transferring at least a portion of the thermal energy generated in the reaction vessel to a heat transfer medium, preferably a heat transfer medium stream HTMS1, in a heat exchanger HE, obtaining a heat transfer medium stream HTMS2, the HTMS2 having an increased thermal energy content compared to HTMS1; and (ii) increasing the pressure of the heat transfer medium stream HTMS2 having the pressure p2, thereby obtaining a heat transfer medium stream HTMS3 having an increased pressure p3 compared to HTMS2. A second aspect of the invention relates to a reaction system for hydrogenation.

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.

The catalyst system includes a heterogeneous procatalyst and a hydrogenation procatalyst. The heterogeneous procatalyst includes a titanium species, an aluminum species, and a magnesium chloride component. The hydrogenation procatalyst has the formula Cp2TiX2, In formula Cp2TiX2, each Cp is a cyclopentadienyl substituted with at least one R1, wherein R1 is (C1-C10)alkyl; and each X is independently a halogen atom.

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.

The invention relates to the field of drug synthesis, and provides a brivaracetam intermediate preparation method, which comprises: carrying out catalytic hydrogenation on a raw material (R)-2-oxo-4-(propyl-1-alkenyl) pyrrolidine-3-carboxylate to obtain an intermediate product (R)-2-oxo-4-propyl pyrrolidine-3-carboxylate, and carrying out decarboxylation to obtain a product (R)-4-propyl pyrrolidine-2-ketone; the catalytic hydrogenation catalyst is obtained by impregnating active carbon with a palladium salt solution twice, the palladium concentration is higher and the impregnation time is shorter in comparison with the post-impregnation and the pre-impregnation, and the impregnation liquid of the post-impregnation also contains a fumaric acid-acrylic acid-vinyl chloride copolymer; the pressure of catalytic hydrogenation is divided into two stages, the pressure of the first stage is 0.1-0.3 Mpa, and the pressure of the second stage is 0.6-1 Mpa. According to the present invention, with the catalytic hydrogenation catalyst, the yield of the (R)-2-oxo-4-propyl pyrrolidine-3-carboxylic ester is increased, and the preparation of the brivaracetam intermediate (R)-4-propyl pyrrolidine-2-ketone is easily achieved.