1859 results about "Catalytic hydrogenation" patented technology

A multi-stage catalytic hydrogenation and hydroconversion process for heavy hydrocarbon feed materials such as coal, heavy petroleum fractions, and plastic waste materials. In the process, the feedstock is reacted in a first-stage, back-mixed catalytic reactor with a highly dispersed iron-based catalyst having a powder, gel or liquid form. The reactor effluent is pressure-reduced, vapors and light distillate fractions are removed overhead, and the heavier liquid fraction is fed to a second stage back-mixed catalytic reactor. The first and second stage catalytic reactors are operated at 700-850.degree. F. temperature, 1000-3500 psig hydrogen partial pressure and 20-80 lb./hr per ft.sup.3 reactor space velocity. The vapor and light distillates liquid fractions removed from both the first and second stage reactor effluent streams are combined and passed to an in-line, fixed-bed catalytic hydrotreater for heteroatom removal and for producing high quality naphtha and mid-distillate or a full-range distillate product. The remaining separator bottoms liquid fractions are distilled at successive atmospheric and vacuum pressures, low and intermediate-boiling hydrocarbon liquid products are withdrawn, and heavier distillate fractions are recycled and further upgraded to provide additional low-boiling hydrocarbon liquid products. This catalytic multistage hydrogenation process provides improved flexibility for hydroprocessing the various carbonaceous feedstocks and adjusting to desired product structures and for improved economy of operations.

A method for preparation of alcohols by catalytic hydrogenation of carbonyl compounds with hydrogen or hydrogen-containing gases in the presence of a hydrogenation catalyst of Raney type, where the catalyst is used in the form of hollow bodies, Preferred as catalytically active components are nickel, cobalt, copper, iron, platinum, palladium or ruthenium.

The present invention relates to processes for preparing gaseous products, and in particular methane and/other value added gases such as hydrogen, via the catalytic hydromethanation of a carbonaceous feedstock in the presence of steam and syngas, wherein a hydromethanation reactor is combined with a syngas generator in a particular combination.

A steam methane reforming method in which a feed stream is treated in a reactor containing a catalyst that is capable of promoting both hydrogenation and partial oxidation reactions. The reactor is either operated in a catalytic hydrogenation mode to convert olefins into saturated hydrocarbons and/or to chemically reduce sulfur species to hydrogen sulfide or a catalytic oxidative mode utilizing oxygen and steam to prereform the feed and thus, increase the hydrogen content of a synthesis gas produced by a steam methane reformer. The method is applicable to the treatment of feed streams containing at least 15% by volume of hydrocarbons with two or more carbon atoms and/or 3% by volume of olefins, such as a refinery off-gas. In such case, the catalytic oxidative mode is conducted with a steam to carbon ratio of less than 0.5, an oxygen to carbon ratio of less than 0.25 and a reaction temperature of between about 500° C. and about 860° C. to limit the feed to the steam methane reformer to volumetric dry concentrations of less than about 0.5% for the olefins and less than about 10% for alkanes with two or more carbon atoms.

The present invention relates to processes for preparing gaseous products, and in particular methane, via the catalytic hydromethanation of a carbonaceous feedstock in the presence of steam, syngas and an oxygen-rich gas stream.

The invention relates to a process for upgrading hydrocarbonaceous feedstreams by hydroprocessing using bulk bimetallic catalysts. More particularly, the invention relates to a catalytic hydrotreating process for the removal of sulfur and nitrogen from a hydrocarbon feed such as a fuel or a lubricating oil feed. The catalyst is a bulk catalyst containing a Group VIII metal and a Group VIB metal.

The present invention provides an improved process for the hydrogenation of 3-hydroxypropanal to 1,3-propanediol which comprises purifying an aqueous solution of 3-hydroxypropanal by contacting said aqueous solution with a purifying agent prior to hydrogenation.

A selective catalytic hydrogenation process able the control the hydroselectivity includes such steps as fixing the selective hydrocatalyst to the rotator of a super-gravitational rotary-bed reactor, rotating to form a rotating catalyst bed, and making the hydrocarbon material and H2 pass through the rotating catalyst bed in parallel mode or opposite mode. Controlling the rotation speed and radial thickness of rotator can control the hydroselectivity.

A continuous process for upgrading sour crude oil by treating the sour crude oil in a two step process that includes a hydro-demetallization section and a hydro-desulfurization section, both of which are constructed in a permutable fashion so as to optimize the operating conditions and catalyst lifespan to produce a high value crude oil having low sulfur and low organometallic impurities.

A catalyst for hydrogenated synthesis of glycollate with oxalate and a preparation method for the catalyst belong to the glycollate preparation technical field. The catalyst of the present invention uses the copper metal as the main active component, and silver as the promoter, and is manufactured with the method of immersion. A carrier of the catalyst is the modified silica sol. The select content of the copper metal is 5 to 45 percent of the carrier weight, and the optimal content of the copper metal is 10 to 40 percent. The content of silver metal is 0.1 to 15 percent of the carrier weight, and the optimal content of silver metal is 1 to 8.0 percent. The select carrier is the silica sol with a double peak pore distribution structure and the specific surface area of the carrier is 100-300m²/g; and the optimal specific surface area of the carrier is 120-240m²/g. The present invention settles the problem of applying a Cr/Cu catalyst in the oxalate gas-phase catalytic hydrogenation. Proven by experiments, the catalyst is provided with the very high reaction activity and glycollate selectivity in the reaction to synthesize glycollate with oxalate and hydrogen Moreover, the catalyst is provided with the long usable life and the stable reaction performance, and can be easily controlled.

The invention relates to hydrocracking of lignin, and specifically relates to a method for applying a tungsten-based catalyst to catalyze lignin hydrocracking for producing an aromatic compound. The catalyst comprises a main active component of non-zero-valent tungsten, and a second metal component of a small amount of one or more transition metals selected from zero-valent nickel, cobalt, ruthenium, iridium, palladium, platinum, iron, and copper. According to the method, raw materials such as lignin, biomass hydrolysis residue, lignosulfonate, and alkaline lignin are subject to catalytic hydrogenation under a hydrothermal condition with a temperature of 120 to 450 DEG C and a hydrogen pressure of 1 to 20MPa; the raw materials are cracked into C6-C9 phenolic compounds with high selectivity. A maximal phenol yield reaches 55.6%. Compared to existing technologies, according to the invention, renewable natural biomasses are adopted as raw materials, such that the raw materials are cheap, and have wide sources; inorganic acid and alkali are not required, such the production of a large amount of alkaline solution in traditional lignin catalysis is avoided; the tungsten-based catalyst is cheap; the reaction process is green, and has atom economical characteristics.

The present invention generally relates to processes for the chemocatalytic conversion of a carbohydrate source to an adipic acid product. The present invention includes processes for the conversion of a carbohydrate source to an adipic acid product via a furanic substrate, such as 2,5-furandicarboxylic acid or derivatives thereof. The present invention also includes processes for producing an adipic acid product comprising the catalytic hydrogenation of a furanic substrate to produce a tetrahydrofuranic substrate and the catalytic hydrodeoxygenation of at least a portion of the tetrahydrofuranic substrate to an adipic acid product. The present invention also includes products produced from adipic acid product and processes for the production thereof from such adipic acid product.

The invention discloses a making method of aminophenol with substituted group through hydrogenating nitrophenol with substituted group, which adopts Ni-A/X typed loaded catalyst, wherein A is one of Co, Mn, Cu, Cr, Mo, Ca, Zn, Fe and W; the carrier X is one of their composition of zeolite molecular sieve, Al2O3, SiO2, TiO2, MgO, active charcoal or amorphic aluminium silicate; the mass percentage of Ni in the catalyst is 2-45% and the mass percentage of component A is 1-40%.

The invention relates to a method for preparing aromatic hydrocarbon by carrying out catalytic hydrodeoxygenation on lignin. A catalyst used in the method provided by the invention comprises two active components, namely an acid site being one or combination of more than one of transition metal elements niobium, tantalum, zirconium, molybdenum, tungsten and rhenium and a hydrogenation or hydrogen transfer active site being one or more than one of ruthenium, platinum, palladium, iridium, iron, cobalt, nickel and copper. According to the method provided by the invention, a phenol group, a guaiacol group, a syringa phenolic group compound, natural lignin and industrial lignin are taken as raw materials, water is taken as a solvent, high selectivity catalytic hydrodeoxygenation is carried out at the temperature of 180-350 DEG C and hydrogen pressure of 0.1-5MPa or with methyl alcohol, isopropyl alcohol and formic acid as hydrogen sources, so that C6-C9 aromatic hydrocarbon is obtained, the highest mass yield of aromatic hydrocarbon is 10%, and content of aromatic hydrocarbon in product oil can be up to more than 75%. The method provided by the invention has the advantages that reproducible natural biomass can be used as a raw material, and the raw material is cheap and available; the water is taken as the solvent, so that a reaction process is environment-friendly; and content of aromatic hydrocarbon in the product is high, and reaction conditions are mild.

The production process is liquid phase catalytic hydrogenation reaction of nitrobenzene halide, such as o-chloronitrobenzene, p-chloronitrobenzene, 3, 4-dichloronitrobenzene and 3-chloro-4-fluoronitrobenzene, etc. with carbon nanotube carried Pd and Pt as hydrogenation catalyst to produce corresponding haloarylamine. The said production process can inhibit hydrodehalogenation, and has the advantages of high selectivity, high yield and high catalyst stability, etc. and thus high practical value.

The invention discloses a method for preparing alkane by high fatty acid ester, which is characterized in that liquid-phase catalytic hydrogenation deoxidation is carried out on the high fatty acid ester to obtain the alkane. The high fatty acid ester, catalyst and solvent are added into a reactor, then hydrogen is charged into the reactor with reaction pressure at 1-10MPa and temperature at 210-320 DEG C, and the reaction time is 4-7h; the high fatty acid ester is fatty acid methyl ester containing 8-22 carbon atoms or fatty acid ethyl ester containing 8-22 carbon atoms; catalyst uses a multi-wall carbon nanotube as carrier and 2-10% of palladium in percentage by weight as active component ; the solvent is one of n-hexane, n-heptane, n-octane, dodecane, or hexadecane. In the invention, the preparation process is simple, the reaction temperature is low, the usage of solvent is less, the combustion high value of the target product is high, and the catalyst can be recycled.

Disclosed herein is the use of manganese, iron, cobalt, or nickel complexes containing tridentate pyridine di-imine ligands as hydrosilylation catalysts. These complexes are effective for efficiently catalyzing hydrosilylation reactions, as well as offering improved selectivity and yield over existing catalyst systems.

The invention relates to a nano ruthenium-carbon loaded metal hydrogenation catalyst and a preparation method thereof. The catalyst consists of an active carbon carrier and metal ruthenium loaded on the active carbon and subjected to reduction activation treatment. The preparation method for the catalyst comprises the following steps: after the active carbon is subjected to ultrasonic treatment by nitric acid solution with a certain concentration, repeatedly using deionized water to wash the active carbon to be neutral, adding the active carbon into water-soluble precursor solution of the metal ruthenium, stirring and soaking the active carbon, then adjusting the pH value of mixed slurry by using alkaline compound aqueous solution, continuously stirring the solution for certain time, filtering the solution, washing a filter cake by water to be neutral, pulping the filter cake by water, adjusting the pH value of the mixed slurry by using the alkaline compound aqueous solution, adding the liquid-phase reduction ruthenium-carbon catalyst of a chemical reducing agent into the solution, washing the filter cake, transferring the filter cake to an oven and drying the filter cake to obtain the nano ruthenium-carbon loaded metal hydrogenation catalyst. The catalytic activity of the catalyst is good, the selectivity is high, the catalyst is particularly applicable to catalytic hydrogenation reaction of pyridine and derivatives thereof, the preparation method is simple to operate, and the production period is short.

The present invention relates to a palladium-containing alloy single atom catalyst for selective hydrogenation of alkyne. According to the catalyst, an inert oxide SiO2 is adopted as a carrier, Pd and one or two or more than two materials selected from metal elements in group IB or Group VIII excluding Pd are combined to prepare the supported palladium-containing alloy catalyst so as to make the Pd be in the complete or partial single atom distribution state, wherein the Pd accounts for 0.002-1% of the weight of the carrier, and the content of other metal elements accounts for 0.2-8% of the weight of the carrier. The palladium-containing alloy single atom catalyst has characteristics of high catalytic hydrogenation activity, high ethylene selectivity and the like, and has the good reaction catalysis performance in the reaction for preparing ethylene gas to eliminate trace acetylene through petroleum cracking under the condition close to the industrial condition.

The present invention provides a processes, having practical utility, for preparing 2-oxindoles, N-hydroxy-2-oxindoles, or mixtures thereof comprising: catalytically hydrogenating a 2-nitroarylmalonate diester to produce a 2-(N-hydroxyamino)arylmalonate diester, a 2-aminoarylmalonate diester, or mixtures thereof as a first reaction intermediate; cyclizing, by intramolecular aminolysis of one ester group, the first reaction intermediate to produce a N-hydroxy-2-oxindole-3-carboxylate ester, 2-oxindole-3-carboxylate ester, or mixtures thereof as a second reaction intermediate; and hydrolyzing and decarboxylating the remaining ester group of the second reaction intermediate to produce the N-hydroxy-2-oxindole, the 2-oxindole, or mixtures thereof, wherein the cyclization reaction and the hydrolysis and decarboxylation reaction are conducted in situ with the catalytic hydrogenation reaction without isolation of said reaction intermediates.

A process for the catalytic hydrogenation of an organic compound, in particular a labile organic compound, in the presence of a support catalyst with a coating containing ruthenium as active metal and a total of 1.01 to 30 wt. % of active metals. Higher stereoselectivity and a greater catalyst shelf life may be obtained by using a support catalyst of which the oxide, carbide, nitride or siliceous support material has a BET (N2) surface area smaller than 10 m2/g, particularly preferably 0.1 to 5 m2/g, prior to loading with at least one active metal diatomaceous earth with a BET (N2) surface area greater than 2 m2/g is excluded and the ruthenium content thereof makes up at least 50 wt. %, preferably at least 99 wt. % of the active metals. The process and the catalysts are particularly suitable for the hydrogenation of polyfunctional compounds such as hydroxycarbonyl compounds and aromatic amines.

Processes are provided for the storage and release of hydrogen by means of a substantially reversible catalytic hydrogenation of extended pi-conjugated substrates which include large polycyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons with nitrogen heteroatoms, polycyclic aromatic hydrocarbons with oxygen heteroatoms, polycyclic aromatic hydrocarbons with alkyl, alkoxy, nitrile, ketone, ether or polyether substituents, pi-conjugated molecules comprising 5 membered rings, pi-conjugated molecules comprising six and five membered rings with nitrogen or oxygen hetero atoms, and extended pi-conjugated organic polymers. The hydrogen, contained in the at least partially hydrogenated form of the extended pi-conjugated system, can be facilely released for use by a catalytic dehydrogenation of the latter in the presence of a dehydrogenation catalyst which can be effected by lowering the hydrogen gas pressure, generally to pressures greater than 0.1 bar or raising the temperature to less than 250° C. or less, or by a combination of these two process parameters.

The invention discloses a method for synthesizing gamma-valerolactone based on catalytic hydrogenation. According to the method, levulinic acid or levulinate derivatives in a reaction solvent is/are subject to catalytic hydrogenation for 1-10 hours by adding hydrogen gas and keeping the hydrogen gas pressure at 0.5-5.0 MPa under the action of a supported cobalt catalyst and the temperature of 50-240 DEG C, and the reaction liquid is treated to obtain the gamma-valerolactone. The cobalt catalyst prepared according to the method has excellent catalytic activity and selectivity, the conversion rate of levulinic acid or levulinate is 100 percent, the yield of the gamma-valerolactone reaches up to 99 percent above; and the method has a simple operation technology, and is low in cost, safe and environment-friendly.

The invention belongs to the technical fields of a catalyst for preparing ethanol through catalytic hydrogenation of acetic acid and application thereof and aims at providing a catalyst for synthesizing ethanol through efficient catalysis and hydrogenation of acetic acid as well as a preparation method and application thereof. The adopted technical scheme is as follows: the catalyst for preparing ethanol through catalytic hydrogenation of acetic acid comprises an active component and a carrier, wherein the active component consists of a first active component and a second active component; the first active component comprises VIII noble metals such as Pd, Pt, Ru and Rh and metal oxides such as MoO3, WO3, CuO and Re2O7; the second active component comprises one of Zn, Cr, Sn, Co, Ni, Ce and OsO4; and the carrier is one of SiO2, Al2O3 and activated carbon. According to the invention, ethanol is synthesized by hydrogenation of acetic acid; two groups of active metals are used as a co-catalyst for concerted catalysis; the noble metals are reduced or not used in the preparation of the catalyst; and in the hydrogenation reaction of acetic acid, the reaction activity is extremely good and the selectivity is high.

The invention discloses a chiral phosphine ligand or an enantiomer, a racemate or a diastereoisomer thereof and a transition metal catalyst comprising the chiral phosphine ligand, wherein the structure of the chiral phosphine ligand is shown as in formula I in the specification. The invention also discloses an application of the chiral phosphine ligand or the transition metal catalyst and a method for efficiently synthesizing chiral beta-aryl amide by using catalytic hydrogenation. The transition metal catalyst can be used for carrying out asymmetric catalytic hydrogenation reaction, thereby efficiently synthesizing the beta-aryl amide compound with a high optical purity.

The present invention relates to a catalyst for preparing arylamine by utilizing catalytic hydrogenation of nitrobenzene compound and its application method, belonging to the field of catalytic synthesis technology in application chemistry. Said catalyst is formed from carrier and active component, its carrier can be metal oxide; carbon materials of active carbon, carbon nano tube and porous carbon, etc.; micropore molecular sieve with different compositions or silica-base material into which one or several kinds of hetero-atoms are added, also can be organic high-molecular polymer. The active component can be double-component (multicomponent) metal formed from metal silver and gold or silver gold and palladium, platinum and copper, etc. in which the weight percentage of active metal component and carrie.r is 0.5-30%.

A process for preparing aliphatic alcohols that includes cobalt-catalyzed hydroformylation of olefins, treatment of a hydroformylation mixture with oxygen-containing gases in the presence of acidic, aqueous cobalt(II) salt solutions, separation of a mixture into an aqueous phase comprising cobalt salts and an organic phase comprising the aliphatic aldehydes, and hydrogenation of an aldehyde-containing organic phase wherein the organic phase and treatment with an adsorbent to separate off cobalt compounds prior to hydrogenation.

The invention relates to a platinum-based selective hydrogenation catalyst. The catalyst uses active carbon as a carrier; and based on the total mass of the catalyst, in terms of mass content, the content of active component platinum metal is 0.5 to 5 percent, and the grain diameter of the platinum metal is less than 30 nanometers. The invention also relates to a preparation method for the catalyst: after the active carbon is subjected to ultrasonic treatment by nitric acid solution with a certain concentration, the active carbon is repeatedly washed by deionized water to be neutral and then added into PtCl2 aqueous solution with a certain pH value to carry out ultrasonic immersion, the solution is filtered, a filer cake is pulped and then reduced by using a chemical reduction method and filtered and washed until no chloride ion exist, and the filter cake is transferred into an oven to be dried to form a nano Pt/active carbon catalyst. The invention further relates to application of the catalyst. The catalytic hydrogenation activity of the catalyst is good, the selectivity is high, the catalyst can effectively inhibit dechlorination without adding dehalogenation inhibitor, the preparation process is simple to operate, and the platinum metal is easy to recover.

Corn cobs are important biomass resources. For a long time, the corn cobs have low chemical utilization ratio or cannot be utilized sufficiently to cause a great waste of resources. The invention develops a method for preparing ethylene glycol, propylene glycol and glycerine by carrying out catalytic hydrocracking conversion on the corn cobs, wherein the product is an important polyester synthetic chemical raw material. The corn cobs are efficiently converted into low carbon polyol products by the processes of acid-catalyzed hydrolysis, catalytic hydrogenation conversion and cracking. The yield of xylose in the hydrolytic process reaches over 30 percent; the conversion rate in the hydrogenation process reaches over 90 percent; and the selectivity in the hydrogenation process reaches over 90 percent.

The invention relates to a catalyst for preparing divalent alcohol by hydrogenating dibasic acid ester and a preparation method and application thereof, which belong to the technical field of catalytic hydrogenation. The catalyst takes metal copper as a main active component, one or a few of rare earth elements or transitional metal elements as a cocatalyst, and SiO2 as a carrier, wherein the content of the metal copper is 5 to 50 percent of the weight of the catalyst, the content of the cocatalyst is 0.1 to 10 percent of the weight of the catalyst, and the balance of the carrier. The catalyst can be used for the reaction for preparing the divalent alcohol by hydrogenating the dibasic acid ester, such as the preparation of ethylene glycol by using diethyl oxalate; and the catalyst has better activity, selectivity and stability, high time space yield of products, simple flow and easiness for continuous operation.