266 results about "Transfer hydrogenation" patented technology

The invention discloses a hydrocarbon oil hydrogenation reactor, which comprises a reactor barrel body and a catalyst bed layer. An outlet and an inlet are respectively formed at the upper part and lower part of the reactor. The reactor is characterized in that: at least one mixer is arranged in the reactor; the reactor is provided with a raw material mixture and a hydrogen inlet and also a hydrogen-containing mixture and a gas outlet; and the inlet of the mixer is connected with the inlet of reactor. Due to the adoption of the reactor, pressure difference of the pressure in the mixer and the pressure outside the mixture is reduced, wall thickness of the reactor is thinned, and equipment investment and operating cost are decreased.

The present invention relates to a catalyst for transfer hydrogenation, which is formed of a metal-organic framework having an MOF-808 based X-ray diffraction pattern.

A high crystalline porous MOF-808 based metal-organic framework exhibits excellent performance in the transfer hydrogenation of ethyl levulinate (EL) at high and low temperature.

A catalyst used for making isodecyl alcohol with decene aldehyde gas phase hydrogenation and a preparation method belong to the technical field of catalyst. The catalyst uses coprecipitation to prepare, and mainly comprises copper oxide, zinc oxide, alumina, the content of which is respectively 20%-70%, 28%-70%, and 1%-10%. The active assistant has the content of 0.1%-2.0% (m/m). The catalyst is used for making isodecyl alcohol with decene aldehyde gas phase hydrogenation, with higher decene aldehyde conversion rate (more than or equal to 99.1%) and isodecyl alcohol selectivity (more than or equal to 96.4%).

This application claims the benefit of German priority Application No. 10138140.9, filed on Aug. 9, 2001, and International Application No. PCT/EP02/08748, filed on Aug. 6, 2002. The invention relates to the production of amines by the reaction of aldehydes or ketones with ammonia or primary or secondary amines in the presence of a hydrogen-donor and the presence of homogeneous metal catalysts of the eighth sub-group under mild conditions.

The invention provides a catalyst for one-step hydrogenation of carbon dioxide to prepare aromatic hydrocarbons, and a preparation method and an application thereof. The catalyst comprises, by mass, 10-90% of nano-metal oxide and 10-90% of a ZSM-5 molecular sieve. The catalyst obtained in the invention has the advantages of excellent catalysis performance, good reaction stability and high target product selectivity; and the highest selectivity of C5+ in hydrocarbon products reaches 80% or more, and the highest selectivity of aromatic hydrocarbons reaches 75%.

The invention discloses a method for preparing sugar alcohol from monosaccharide. The method comprises the following steps: mixing the monosaccharide with deionized water, adding the obtained mixture to a reaction kettle, and stirring the mixture under normal pressure and nitrogen atmosphere conditions under the action of a metal catalyst and a hydrogen donor to carry out a transfer hydrogenation reaction in order to obtain corresponding sugar alcohol. The hydrogen donor is used as a hydrogen source to replace hydrogen, the initial reaction pressure decreases to normal pressure from 3.0-12.0MPa, the reaction temperature decreases to 85-95DEG C from 120-150DEG C, the mass yield of the sugar alcohol in the final product under mild reaction conditions can reach 70% or above, and the used hydrogen donor is acidified by formic acid to realize reutilization, so the method is green and environmentally-friendly. The method has the advantages of simple process, mild reaction conditions, low energy consumption in the production process, low production difficulty, high operating safety, high greenness, high safety, low cost, and promotion facilitation.

The invention provides a catalyst to prepare furfural gas 2-methylfuran and the preparation method. Silica is used as the carrier, copper oxide is used as the main active component and alkali metal or alkaline earth metal is used as the promoter. The preparation method of the catalyst adopts impregnation method. the catalyst has the advantages of high product yield, few by-products, little influence on environment, and long service life, etc, and is widely applicable in production of 2-methylfuran.

The invention belongs to the technical field of medicine, and discloses a preparation method of (3S,2'S), (3S,2'R), (3R,2'R) and (3R,2'S) four type chiral monomers of muscarine receptor antagonist racemic medicine glycopyrronium bromide. The method comprises the following steps: resolving racemic alpha-cyclopentylmandelic acid by a chemical resolution method by using L-Tyrosine methyl ester and (R)-alpha-phenylethylamine as resolution reagents to respectively prepare (S)-alpha-cyclopentylmandelic acid and (R)-alpha-cyclopentylmandelic acid; and carrying out esterification reaction to respectively obtain chiral intermediates (S)/(R)-alpha-cyclopentylmethyl mandelate. L/D-malic acid used as the raw material is subjected to four reaction steps, including condensation, carbonyl reduction, catalytic hydrogenation or transfer hydrogenation reduction debenzylation, and reduction alkylation or alkylogen alkylation, in a chiral synthesis mode to obtain another important chiral intermediate (S)/(R)-N-methyl-3-hydroxypyrrolidine. The chiral intermediate is subjected to ester exchange and quaterisation to respectively obtain the four (3S,2'S), (3S,2'R), (3R,2'R) and (3R,2'S) type glycopyrronium bromide chiral monomers. The result indicates that the (3R,2'S)-glycopyrronium bromide has the strongest cholinergic antagonistic action.

The invention relates to intermediates, namely a compound 1 of a formula (1) as shown in the specification and a compound 2 of a formula (2) as shown in the specification, for preparing ceritinib, or a chemically acceptable salt of the compound 2, wherein R represents the benzylic group of saturated or unsaturated aromatic ring methylene or heteroaromatic ring methylene, and X represents a halogen. The invention relates to a method for preparing a compound 4 by use of the new intermediates, namely the compound 1 and the compound 2, wherein the step of reduction from the compound 1 to the compound 2 is performed by use of a hydroboron or a composition thereof and an alcohol solvent; the compound 2 is reduced by use of a catalytic hydrogenation or transfer hydrogenation method to generate the compound 4. The route of preparing the compound 4 by use of the compound 1 and the compound 2 has the advantages that the chemical reduction step is combined with a catalytic hydrogenation, the use of expensive platinum dioxide is avoided and the cost of synthesizing the intermediate 4 of the ceritinib is effectively reduced.

The invention relates to a catalytic hydrogenation method of alkene. Under the conditions of alkene hydrogenation and the existence of hydrogenation catalysts, the alkene is reacted with hydrogen in contact way in a reactor; wherein, the reactor comprises a reacting tower and a reacting vessel, and the reacting tower and the reacting vessel are communicated with each other; the reaction tower is positioned above the reacting vessel; the hydrogen is sent into the reacting vessel from the bottom of the reacting vessel; the alkene is sent into from the middle-upper part of the reacting tower and/or the reacting vessel and contacts hydrogen in a countercurrent way; during the hydrogenation, the production separation is carried out; the light fraction exacted from the reacting tower after hydrogenation and the heavy fraction left on bottom of the reacting vessel after hydrogenation are reclaimed. The method of the invention saves the separation step and separation equipment of the ordinary alkene hydrogenation, thus greatly simplifying technology process. Besides, by directly applying reaction heat to separation of products, the energy consumption is decreased. In addition, the catalysis is carried out by taking the way of suspending and dispersing the hydrogenation catalyst into the reaction compound containing hydrogen and alkene so as to greatly improve catalysis effect and efficiency.

The invention discloses a catalyst for preparing 1, 4-cyclohexanedimethanol by catalyzing dimethyl terephthalate through one-step hydrogenation and a preparation method of the catalyst, belonging to the technical field of catalyst preparation. The catalyst is a supported catalyst active ingredients of which are loaded on carriers Al2O3, wherein the active ingredients include three metals, namely, ruthenium, platinum and tin. The catalyst is prepared by adopting a co-impregnation method. According to the invention, the 1, 4-cyclohexanedimethanol is prepared by performing one-step hydrogenation on dimethyl terephthalate by only using a hydrogenation catalyst and a singe reaction solvent, and higher product yield is obtained; the separation of an intermediate product and the consumption of the solvent are avoided; and the consumption of energy and resources through the traditional process is reduced.

The invention provides a method for preparing 1,6-hexylene glycol through dimethyl adipate gas-phase hydrogenation. The method comprises the following steps: by taking a hierarchical pore SiO2 molecular sieve as a carrier, loading a copper-based catalyst, mixing gasified dimethyl adipate with hydrogen, putting the mixture into a fixed bed reactor for reaction under a certain condition, a 1,6-hexylene glycol-containing liquid phase product is obtained. According to the method provided by the invention, by taking the SiO2 molecular sieve with ordered meso pores and micro pores as the carrier, the dispersity of copper serving as an active component is substantially promoted, and the number of effective active sites of the catalyst is increased; moreover, due to the adoption of an ammonia distillation method, the copper is loaded on the mesoporous silicon oxide molecular sieve, so that high dispersion of the catalyst is realized; furthermore, the ordered meso pores of the hierarchical pore SiO2 molecular sieve is retained, and the catalysis capacity is improved.

The invention discloses a method for preparing 2,5-furandimethanol by transfer hydrogenation of 5-hydroxymethylfurfural. The 5-hydroxymethylfurfural, a catalyst MnO@C-N and a lower alcohol are added into a stainless steel closed reactor for reaction at 150-200 DEG C for 1-30 h, and the materials are stirred at a rate of 300-900 rpm during the reaction. For the first time, the method of the invention uses the MnO@C-N as a catalyst to catalyze aldehyde to alcohol. The catalyst MnO@C-N used by the method uses renewable sucrose and urea as raw materials, and the preparation process is simple and environmentally friendly. The method uses the cheap lower alcohol as a hydrogen source for a reduction reaction, has the advantages of safe reaction process, simple operation and high product selectivity, and has great industrial application value.

The invention belongs to the field of allyl alcohol compounds, and relates to a method for allyl alcohol compounds (II) from alpha,beta-unsaturated aldehyde ketones (I) by transfer hydrogenation, which comprises the following step: by using a metal iridium coordination compound (III) as a catalyst, carrying out transfer hydrogenation reaction on the alpha,beta-unsaturated aldehyde ketones in a formic acid/sodium formate water phase solution. The method provided by the invention is characterized in that the allyl alcohol compounds are prepared by catalyzing the alpha,beta-unsaturated aldehyde ketones in the formic acid/sodium formate water phase. Compared with the reported allyl alcohol compound preparation method, the method provided by the invention uses water as the solvent, and thus, is green, safe, environment-friendly and pollution-free; and meanwhile, the method has the advantages of mild conditions and high product purity, and is simple to operate. The obtained allyl alcohol compounds have very high economic value in the aspects of synthesis of aroma regulators, food flavor additives and drug intermediates, and the like.

The invention relates to a method for synthesizing glycolic acid ester by gas-phase hydrogenation of oxalate, and is used for mainly solving the technical problem of low yield of glycolic acid ester in the prior art. The problem is better solved through adopting the technical scheme that the method comprises the steps: taking oxalate as a raw material, pre-mixing with hydrogen gas containing a dilution gas, then under conditions of the temperature of 120 DEG C-250 DEG C, the pressure of 0.5-5 MPa, the oxalate weight space velocity of 0.1-6 h<-1> and the hydrogen gas-oxalate molar ratio of 10-150, carrying out a contact reaction with a catalyst, and generating an effluent containing glycolic acid ester. The method can be used in industrial production of glycolic acid ester.

The invention relates to optical activity di(heteto)aryl methanol and an asymmetric synthesis method thereof. The method comprises the following steps: taking mono-sulfonyl chiral diamine and a complex of metals ruthenium, rhodium and iridium as catalysts, taking sodium formate or formic acid/triethylamine or isopropanol as a hydrogen source, carrying out an asymmetric transfer hydrogenation reaction of di(heteto)aryl ketone first, thereby obtaining the optical activity di(heteto)aryl methanol. The method is mild in reaction conditions, easy and convenient to operate, readily available in raw materials, wide in substrate application range and high in enantioselectivity and has important application prospects in the aspects of synthesis of antihistamine chiral drugs such as diphenhydramine, methyldiphenhydramine, carbinoxamine and bepotastine.

The invention belongs to the technical field of preparation of catalysts, and concretely relates to a porous carbon aerogel catalyst, and a preparation method and an application thereof. The method comprises the following steps: dissolving cellulose under a high-speed stirring condition, mixing the dissolved cellulose with a transition metal salt solution, and sequentially solidifying, drying, carbonizing and washing the obtained mixed solution to simultaneously achieve the preparation of aerogel and the loading of a transition metal in order to obtain the porous carbon aerogel with highly dispersed catalyst active sites. The catalyst has a good stability and a high catalytic activity, and can efficiently catalyze the transfer hydrogenation reaction of aldehydes, ketones or levulinates andalcoholic organic substances, wherein the conversion rate of aldehydes to alcohols reaches up to 98-100%, and the selectivity of alcohols reaches up to 81-99%. The catalyst is a solid aerogel monolith catalyst, so the catalyst can be well dispersed in a solution without stirring, and is easy to separate and recover. Additionally, the catalyst adopts cellulose as a raw material, so the catalyst has the advantages of low cost, greenness, environmental protection, renewability, simple preparation process, and easiness in industrialization.

An enzymatic citral asymmetric reduction method capable of increasing optical purity of (R)-citronellal is disclosed, namely a method coupling an amino-acid-catalyzed citral cis-trans isomerization reaction and a citral asymmetric hydrogenation reaction catalyzed by a saccharomyces cerevisiae enol reductase OYE1 to increase the optical purity of the (R)-citronellal that is a product of citral hydrogenation. When citral cis-trans isomers are subjected to the asymmetric hydrogenation reaction catalyzed by the saccharomyces cerevisiae enol reductase OYE1 to synthesize the (R)-citronellal, the (R)-citronellal is derived from trans-citral, (S)-citronellal is derived from cis-citral, and the catalysis speed for the trans-citral is higher than that for the cis-citral. Through coupling with the amino-acid-catalyzed citral cis-trans isomerization reaction, a part of the cis-citral is converted into the trans-citral, thus greatly increasing the ee value of the product that is the (R)-citronellal. In a catalytic system having a volume of 10 mL, 100 mg/mL of glycine is added, after 50 mM citral is subjected to a catalytic reaction for 4 h, the ee value of the (R)-citronellal is 65.4%, and is increased by 48.7% when being compared with the ee value of (R)-citronellal when the cis-trans isomerization reaction is not coupled.

The invention relates to an asymmetric synthesis method of an ophthalmologic drug pylistramine besylate. The method concretely comprises the following steps: oxidizing (4-chlorophenyl)(2-pyridyl)methanone to obtain (4-chlorophenyl)(2-pyridyl)ketone-N-oxide; carrying out asymmetric transfer hydrogenation reduction on the (4-chlorophenyl)(2-pyridyl)ketone-N-oxide through using a complex of monosulfonyl chiral diamine and metallic ruthenium, rhodium and iridium as a catalyst and a sodium formate or formic acid and triethylamine mixture or isopropanol as a hydrogen source in order to prepare (S)-(4-chlorophenyl)(2-pyridyl)methanol-N-oxide; reducing the (S)-(4-chlorophenyl)(2-pyridyl)methanol-N-oxide to prepare (S)-(4-chlorophenyl)(2-pyridyl)methanol; and condensing the (S)-(4-chlorophenyl)(2-pyridyl)methanol and ethyl 4-(4-bromopiperidine-1-yl)butyrate to obtain the ophthalmologic drug pylistramine besylate. The total yield is 61.6%.

The present invention provides a method for producing chiral amines, comprising asymmetric transfer hydrogenation of imine compounds in the presence of a hydrogen donor compound and an iridium(III) complex having a chiral prolinamide compound as a ligand. The present invention is useful for production of chiral amines in an efficient manner in terms of their optical and chemical yields.