438 results about "Hydrogen transfer" patented technology

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.

Processes are disclosed that achieve a high conversion of lignin to aromatic hydrocarbons, and that may be carried out without the addition of a base. Depolymerization and deoxygenation, the desired lignin convention steps to yield aromatic hydrocarbons, are carried by contacting a mixture of lignin and a solvent (e.g., a lignin slurry) with hydrogen in the presence of a catalyst. A preferred solvent is a hydrogen transfer solvent such as a single-ring or fused-ring aromatic compound that beneficially facilitates depolymerization and hinders coke formation. These advantages result in favorable overall process economics for obtaining fuel components and/or chemicals from renewable sources.

A method of converting at least one first alkane to a mixture of at least one low molecular weight alkane (optionally also including additional lower and/or higher molecular weight alkanes) and at least one high molecular weight alkane, comprises: reacting a first alkane in the presence of dual catalyst system comprising a first catalyst (i.e., a hydrogen transfer catalyst) and a second catalyst (i.e., a metathesis catalyst) to produce a mixture of low and high molecular weight alkanes.

An improved opiate synthesis scheme is provided. An improvement to the oxidation of oripavine and oripavine derivatives comprises the in-situ formation of the peroxacids required to oxidize the oripavine and oripavine derivatives to form an intermediate. An improvement to the reduction of the intermediate to form oxycodone and oxycodone derivatives comprises reduction utilizing a hydrogen transfer reagent. These improvements allow the production of oxycodone and oxycodone derivatives without isolation of the intermediate, providing a one-pot synthesis method.

The invention relates to a method for preparing gamma-valerolactone with high selectivity under the mild condition. The method comprises the following steps of: under the conditions of optimal room temperature and inert gas, with secondary alcohol as a hydrogen source and active Raney nickel as a catalyst, carrying out hydrogen transfer reaction on a levulinic acid ester compound to obtain the gamma-valerolactone. The invention particularly relates to a method of preparing gamma-valerolactone by a lignocellulose derivative with high selectivity under the mild condition, which comprises the following steps of: carrying out alcoholysis reaction on the lignocellulose derivative such as fructose, 5-hydroxymethylfurfural or furfuryl alcohol by a solid acid catalyst in the presence of an alcohol solvent at certain temperature, filtering solid acid, collecting liquid, and obtaining levulinic acid esters through reduced pressure distillation; and with the secondary alcohol as the hydrogen source, catalyzing the obtained esters by Raney Ni as a non-noble metal catalyst at the room temperature to obtain the gamma-valerolactone with high yield.

The invention belongs to the field of petrochemical industry, and relates to a method for preparing propene by catalytic cracking, which is characterized by comprising the following steps: firstly synthesizing molecular sieve ZSM-5 crystal nuclei, and preparing a silicon source, seed crystals, templating agent and deionized water into a colloidal liquid; preparing an aluminum source, inorganic acid or alkali and deionized water into a solution; while stirring, adding the solution into the colloidal liquid to prepare a uniform gel; carrying out hydrothermal crystallization on the gel, and stopping crystallization before the crystallization induction period finishes; and preparing the molecular sieve ZSM-5 crystal nuclei into a catalytic cracking catalyst which is used for preparing propylene and isobutylene by cracking olefins. The molecular sieve ZSM-5 crystal nuclei catalyst only has a weak acid center; the crystal grains are very tiny and do not need any modification treatment, and hydrogen transfer aromatization and other side reactions can be obviously inhibited without any negative pressure or diluent gas condition, thereby enhancing the selectivity of the target product, simplifying the catalytic cracking technique and lowering the catalyst cost.

The present invention relates to a hydrogen storage composition prepared in accordance with a method comprising: (a) combining (i) a metalliferous material selected from the group consisting of: (A) metal or a metalloid, or an alloy thereof, or a compound thereof, or an homogeneous or an inhomogeneous combination of at least two of a metal or a metalloid, or an alloy thereof, or a compound thereof, or (B) a hydride of any of: a metal or a metalloid, or alloy thereof, or a compound thereof, or an homogeneous or an inhomogeneous combination of a metal or a metalloid, or an alloy thereof, or a compound thereof, with ii) a liquid consisting essentially of any of: water, at least one alcohol, or a mixture of water and at least one alcohol, to form a first intermediate; and (b) milling the first intermediate for form an hydrogen transfer facilitator; (c) combining the hydrogen transfer facilitator with a second metalliferous material selected from the group consisting of: (A) a metal or a metalloid, or an alloy thereof, or a compound thereof, or an homogeneous or inhomogeneous combination of at least two of a metal or a metalloid, or an alloy thereof, or a compound thereof, or (B) a hydride of any of: a metal or a metalloid, or an alloy thereof, or a compound thereof, or an homogeneous or inhomogeneous combination of at least two of a metal or a metalloid, or an alloy thereof, or a compound thereof, such combining effecting sufficient contact between the hydrogen transfer facilitator and the second metalliferous material so that the hydrogen transfer facilitator is configured to effect absorption or desorption of hydrogen by the second metalliferous material.

The invention provides a catalytic conversion method for increasing propylene yield. The method is characterized in that high-quality catalytic cracking raw oil is contacted with a thermal regenerated catalyst having lower mean activity and activities distributed relatively uniformly in a first reaction zone of a reactor to carry out cracking reaction, the generated oil gas and a carbon-containing catalyst carry out selective hydrogen transfer reaction and isomerisation reaction in a certain reaction environment in a second reaction zone, the reaction products and a spent catalyst are separated, the reaction products are further separated into liquefied gas, light gasoline fractions, heavy gasoline fractions, diesel and other products by a fractionating system, the separated spent catalyst is recycled after being stripped and regenerated, and the C4 fraction and/or the light gasoline fractions are injected into the reactor for further reaction. By the method, the propylene yield can be increased and product distribution can be simultaneously improved.

A process is disclosed for taking a cut from an FCC reactor product and reacting it in a separate reactor to upgrade the product quality Cracking or reformulating reactions in the separate reactor give reductions in olefins and reformulating hydrogen-transfer reactions convert undesirable olefins to isoparaffins and aromatics without reducing octane value Catalyst particles from the FCC reactor may be cycled to the separate reactor This process has also been found to substantially diminish concentrations of nitrogen and sulfur compounds fed to the separate reactor.

A method of converting at least one first alkane to a mixture of at least one low molecular weight alkane (optionally also including additional lower and/or higher molecular weight alkanes) and at least one high molecular weight alkane, comprising: reacting a first alkane in the presence of dual catalyst system comprising a first catalyst (i.e., a hydrogen transfer catalyst and preferably an iridium pincer complex catalyst) and a second catalyst (i.e., a metathesis catalyst) to produce a mixture of low and high molecular weight alkanes.

The invention belongs to the chemical industry technical field and concretely provides a method of preparing for aromatic amine, alcohol or alkane by multi-phase catalytic hydrogenation transfer. The invention considers aromatic nitryl compound, aldehyde ketone and alkene compound as a substrate, hydrogenous polyatomic molecule as a hydrogen donor and loading type nano-gold as catalyst for reflux and stirring for the multi-phase catalytic hydrogenation transfer reaction under 80 DEG C to 200 DEG C and 0.4 to 0.6MPa to prepare for the aromatic amine, alcohol or alkane. The reaction condition of the method of the invention is gentle; the environment is friendly; the applied catalyst has high reaction activity and good selectivity.

Disclosed is an improved method for preparing the isoflavonoid compound (+/−)-equol, the method comprising reducing an organic diester of the isoflavone daidzein under hydrogen-transfer conditions using palladium hydroxide catalyst.

The invention discloses a nitrogen-doped ultra-thin carbon nanosheet loaded monoatomic catalyst and a preparation method and application thereof. The monoatomic catalyst uses the nitrogen-doped ultrathin carbon nanosheet as a carrier, the metal loading is adjustable, the preparation method is simple and feasible and the reproducibility is good, and the preparation method is suitable for various metals (such as Co, Fe, Ni, Cu, Mn and the like). According to the technical scheme, the method comprises the following steps of: (1) adsorbing a complex formed by a metal salt and a ligand on g-C3N4;(2) spreading a layer of dopamine polymer outside the obtained complex; (3) carrying out high-temperature treatment on the coated material in an inert atmosphere to obtain the metal monoatomic catalystloaded on the nitrogen-doped ultrathin carbon nanosheet. The cobalt monatomic catalyst shows excellent activity and selectivity in nitrobenzene hydrogen transfer reaction, and the TOF value of the catalyst under similar reaction conditions is 20 times of the best result reported by the literature, so that the cobalt monatomic catalyst has great application prospect.

The invention discloses a method for preparing furfuryl alcohol by utilizing hydrogen transfer reaction to catalyze furfuraldehyde. The method comprises the following steps: by taking low alcohol as a solvent and a hydrogen source, and taking a zirconium compound as a catalyst, preparing furfuryl alcohol by catalyzing the furfuraldehyde transfer and hydrogenation reaction under the condition of ordinary pressure nitrogen atmosphere in low alcohol, wherein the reaction temperature is at 140-180 DEG C and the reaction time is 0.5-3.5h. The method provided by the invention has the advantages of simple process, mild reaction condition, low energy consumption of production, low production difficulty, high operation safety, environment protection, safety, low cost, percent conversion of furfuraldehyde as high as 100%, furfuraldehyde yield as high as 98% or above and benefit in popularization.

The invention provides a method for preparing furfuryl alcohol by utilizing a hydrogen transfer reaction to catalyze furfural. The method comprises the following steps that under the catalysis of a heterogeneous catalyst, namely magnetic hydroxyapatite, the furfural and alcoholic compounds with hydrogen donors are subjected to the hydrogen transfer reaction, wherein the ratio of the magnetic hydroxyapatite to the alcoholic compounds to the furfural is 20-120 g to 8-20 L to 1 mol. A reaction container is filled with nitrogen (N2) of which pressure is 1-20 bar at room temperature, the reaction temperature is 100 DEG C-200 DEG C, and a reduced product, namely the furfuryl alcohol, is obtained after 1-12 h. The method for preparing the furfuryl alcohol by utilizing the hydrogen transfer reaction to catalyze the furfural is simple in process, convenient to operate and safe and environmentally friendly. The catalyst is a non-precious metal catalyst and cheap and easy to obtain, has magnetism and is easy to separate, and can be reused repeatedly. The activity does not decrease. The industrial cost of preparing the furfuryl alcohol can be lowered to a large extent, ethyl levulinate can be catalyzed to react and gamma-valerolactone is generated, and other compounds containing C=O bonds can be also reduced.

The invention discloses a hydrophobic monomer for synthesizing a temperature sensitive polymer oil-displacing agent and a preparation method thereof, which belong to the technical field of the design of oilfield chemical agents. In order to solve the problems of bad temperature resistance, salt resistance and anti-shear ability of a part of hydrolyzed polyacrylamide serving as an oil-displacing agent and solve the problems of complex synthesis method, dissolution difficulty and high cost of modified temperature-resistant and salt-resistant polymer oil-displacing agents, the invention provides a method for synthesizing a temperature sensitive polymer oil-displacing agent with a thermo-thickening function by copolymerizing poly N-alkyl acrylamide, acrylamide and a temperature-resistant, salt-resistant and hydrophobic monomer. According to the design, n-butylbenzene is used as a raw material, and the hydrophobic monomer p-n-butylbenzene ethylene is synthesized through three chemical reactions of Friedel-Crafts acylation, negative hydrogen transfer reduction and dehydration of alcohol to alkene. The reaction conditions are mild, the purification method is simple, the product is pure, and the requirements of temperature resistance and salt resistance of the hydrophobic monomer for forming the temperature sensitive polymer oil-displacing agent can be met.

A container for use in hydrogen transfer includes structural tubular members and perforations for fluid communication with a central passage covered with a film that is selectively permeable to hydrogen, but not to other gases. The tubular member walls comprise a sturdy material to fix the hydride powder, preventing it from shifting within the container. The hydrogen flow, when being absorbed or desorbed by the metal hydride, will pass through the film both as it is absorbed in the hydride material and also after it is desorbed to pass into the central passage. Simultaneously, the tubular member material, acting as a flexible cover or support for the film, retains contaminant gases within the conduit passage, but permits hydrogen to flow therethrough. Alternatively, a flexible conduit may be interspersed within selected ones of the longitudinal structural members, and hydride material may be packed within the springs, which provide for expansion protection.

The invention relates to a novel nitrogen heterocycle ligand/phosphine ligand transition metal complex, and preparation and application thereof in asymmetric catalytic hydrogenation and hydrogen transfer. The complex has the following structural formula: [MLnL' XY], wherein the transition metal M is Ru, Rh, Ir, Pd, Pt, Co, Ni or Os. The complex also contains a nitrogen heterocycle ligand, two monophosphine ligands or one diphosphine ligand, and the like. The transition metal compound, dinitrogen or mononitrogen ligand and diphosphine or monophosphine ligand react at 0-120 DEG C in an organic solvent for 0.5-20 hours to obtain the complex. The complex is used for asymmetric catalytic transfer hydrogenation or asymmetric hydrogenation reaction, and especially for asymmetric catalytic hydrogenation reaction of ketones, esters, hypnones and derivatives thereof, diphenyl ketones and derivatives thereof, beta-N,N-dimethylamino-alpha hypnones and derivatives thereof and other ketone compounds of which the alpha site is a large steric hindrance alkyl group.

It has been discovered that the polymerization of vinyl aromatic compounds, such as styrene, may be inhibited by the addition of a composition that contains an alkyl-dihydroxyarene, a hydrogen transfer agent, and a stable nitroxide. In another, preferred embodiment of the invention, these three components are blended in an organic amine.

The invention discloses a method for preparation of long-chain alkane from unsaturated fatty acid at zero hydrogen consumption. The method includes: 1) adding unsaturated fatty acid and a non-noble metal catalyst in a mass ratio of 4:1-20:1 into a high temperature and high pressure reaction kettle; 2) conducting heating to 300-390DEG C to carrying out reaction for 1-8h; 3) cooling the reaction product, dissolving the product in an organic solvent, and performing filtering to obtain a liquid product and a solid catalyst; and 4) subjecting the catalyst to cleaning and regeneration for reuse. The catalyst is a double-active non-noble metal loaded catalyst, is prepared by co-precipitation method or impregnation method, and is regenerated by reduction calcination in hydrogen. According to the invention, solvent is unnecessary in the reaction process, the energy consumption is low, and the emission is little. The non-noble metal catalyst can effectively catalyze in-situ hydrogen transfer and non-hydrogen decarboxylation reaction, the catalyst is low in cost and is easy to recover, and the process is simple and green, and has zero hydrogen consumption.

The invention relates to a method for preparing styrene with high selectivity through methylbenzene and synthesis gas. The method comprises the following steps of leading raw gas containing the methylbenzene and the synthesis gas into a reactor, enabling the raw gas to be in contact with a dual-function catalyst after hydrogen reduction, and performing a side chain alkylation reaction to prepare the styrene, wherein the dual-function catalyst comprises an alkaline molecular sieve and a metallic oxide. According to the method disclosed by the invention, the synthesis gas is used for replacing methanol for performing the side chain alkylation reaction of the methylbenzene, so that not only can the cost of raw materials be reduced, a dehydrogenation step in a conventional styrene preparation process is omitted, the energy consumption is reduced, but also a hydrogen transfer reaction of the styrene and the methanol in the side chain alkylation reaction of the methylbenzene and the methanol is avoided, the styrene/ethylbenzene ratio of products is increased, and the method has the characteristics that the methylbenzene conversion rate is high and the selectivity of the styrene in the products is high.