294results about "Preparation by dehydrogenation" patented technology

The present invention relates to novel Ruthenium catalysts and related borohydride complexes, and the use of such catalysts, inter alia, for (1) hydrogenation of amides (including polyamides) to alcohols and amines; (2) preparing amides from alcohols with amines (including the preparation of polyamides (e.g., polypeptides) by reacting dialcohols and diamines and/or by polymerization of amino alcohols); (3) hydrogenation of esters to alcohols (including hydrogenation of cyclic esters (lactones) or cyclic di-esters (di-lactones) or polyesters); (4) hydrogenation of organic carbonates (including polycarbonates) to alcohols and hydrogenation of carbamates (including polycarbamates) or urea derivatives to alcohols and amines; (5) dehydrogenative coupling of alcohols to esters; (6) hydrogenation of secondary alcohols to ketones; (7) amidation of esters (i.e., synthesis of amides from esters and amines); (8) acylation of alcohols using esters; (9) coupling of alcohols with water to form carboxylic acids; and (10) dehydrogenation of beta-amino alcohols to form pyrazines. The present invention further relates to the novel uses of certain pyridine Ruthenium catalysts.

The invention discloses preparation methods and application of a mercapto MOFs (Metal-Organic Frameworks) photocatalyst UiO-66(SH)2 and a series of noble metal mercapto MOFs photocatalysts M/UiO-66(SH)2 (M=Au, Pd and Pt). The UiO-66(SH)2 is prepared based on a pre-functionalization strategy by using zirconium tetrachloride and 2,5-dimercapto-1,4-terephthalic acid as precursors and combining with a solvent thermal synthesis method. By utilizing the metal affine effect of a mercapto functional group on a ligand skeleton, a noble metal ion is anchored on the UiO-66(SH)2, so that an M/UiO-66(SH)2 composite photocatalytic material is successfully prepared. In a loading process, an inert atmosphere, the addition of a strong reducing agent or a heat treatment process is not needed; highly dispersed Au, Pd and Pt ions can be loaded on a UiO-66(SH)2 material through a simple mixing process only. The UiO-66(SH)2 and the M/UiO-66(SH)2 both show favorable activity in an experiment of photocatalytically selectively oxidizing benzyl alcohol.

Disclosed is a process for the production of higher aldehydes from lower alcohols using a two-stage vapor phase heterogeneous catalyst system. Ethanol feeds afford aldehydes such as butyraldehyde and crotonaldehyde while butanol feeds yield 2-ethylhexanal and 2-ethylhexenal. Higher product selectivities are obtained when the alcohol is first dehydrogenated in the upper catalyst stage followed by aldol condensation of the resulting lower aldehyde to a higher aldehyde.

The invention discloses a method for the preparation of menthone. A palladium-ruthenium catalyst is used for heterogeneous catalysis under mild conditions, and isopulegol is used for the preparation of the menthone. The palladium-ruthenium catalyst can be used for efficiently catalyzing the isopulegol and making the isopulegol convert into menthone under the mild conditions.

The present invention provides a catalytic process for the synthesis of furfuryl alcohol and cyclohexanone simultaneously over a copper based catalyst in vapour phase conditions by hydrogenation of furfural and dehydrogenation of cyclohexanol respectively.

The invention provides a production method and a production system of cyclohexanone. The method comprises the following steps of (1) a partial hydrogenation process of benzene; (2) an extractive distillation process; (3) a cyclohexanone treatment process; (4) a hydration process; (5) a hydrogenation catalyst regeneration process; (6) a hydration catalyst regeneration process; (7) a cyclohexanol dehydrogenation process; and (8) an alcohol ketone refining process. According to the production method and the production system of the cyclohexanone provided by the invention, a traditional production process and a traditional production system for preparing the cyclohexanone through a cyclohexene hydration method are optimized, the conversion rate of the raw material benzene is improved by more than 95 percent from 75 percent compared with a traditional process, the usage amount of new hydrogen during the partial hydrogenation process of the benzene is reduced, the selectivity of extraction agents during the extractive distillation process is improved, the extractant volume is reduced, the number of equipment is reduced, the space occupied by the equipment is reduced, and the like.

The present invention provides methods, reactor systems, and catalysts for increasing the yield of aromatic hydrocarbons produced while converting alkanols to hydrocarbons. The invention includes methods of using catalysts to increase the yield of benzene, toluene, and mixed xylenes in the hydrocarbon product.

The invention relates to the realization of synthesis of organic compounds or abatement of volatile organic compounds (VOCs) in gas-solid fluidised bed photocatalytic reactor with improved illumination efficiency. The photoreactor consists of a two-dimensional fluidized bed catalytic reactor with two walls transparent to ultraviolet radiation, by an illumination system bases on a matrix of LEDs positioned near its external walls, and heated for Joule effect inside the catalytic bed to monitor the reaction temperature. Surprisingly, through the choice of a suitable catalyst and fluidized bed photoreactor operating conditions both total and partial oxidation reactions can be achieved with high activity and selectivity. Even more surprisingly, the value of the illuminated catalyst surface area per unit irradiated volume reaches values in the order of 10⁶ m⁻¹, significantly higher than those of microreactors, amounting to 250,000 m⁻¹ and slurry reactors with values in 8500-170000 m⁻¹.

The photocatalytic system reported in the present invention is shown to have high illumination efficiency due to the use of UV-LEDs, which, ensuring a direction of light irradiation direction orthogonal to the emission point, minimize the dispersion of photons.

The invention belongs to the technical field of organic chemical industry, and particularly relates to a preparation method of vanillin. The preparation method includes: using 3-methoxy-4-hydroxybenzyl alcohol as a raw material and pure water as a solvent; under action of a Pd modified SBA-15 catalyst, enabling dehydrogenation reaction to obtain vanillin. The preparation method has the advantages that cost is low, and the water which is environment-friendly can be utilized as the solvent, so that using of conventional organic solvents like methylbenzene and benzene is avoided; the solvent is easy to separate and recycle.

The present invention provides methods, reactor systems, and catalysts for increasing the yield of aromatic hydrocarbons produced while converting alkanols to hydrocarbons. The invention includes methods of using catalysts to increase the yield of benzene, toluene, and mixed xylenes in the hydrocarbon product.

The invention relates to an isoborneol-dehydrogenated camphor refining method. The method sequentially comprises a dehydrogenation reaction and solvent recovery step, a camphor vaporization subliming step and a camphor sublimation collecting step, wherein the dehydrogenation reaction and solvent recovery step comprises the steps of feeding a mixed solution of the isoborneol and an isoborneol dissolving solvent and a dehydrogenation catalyst into a reactor, heating the reactor so as to realize dehydrogenation reaction, exhausting hydrogen gas produced from the dehydrogenation reaction by using a fractionating column, and recovering the isoborneol dissolving solvent. According to the method, the disadvantage in the existing isoborneol-dehydrogenated camphor refining process that the steps of dehydrogenation reaction, solvent recovery and vaporization subliming are required to be carried out sequentially in different devices is overcome, the integration of a dehydrogenation reactor, a solvent recovery device and a sublimation device can be realized, and thus the steps of dehydrogenation reaction, solvent recovery and vaporization subliming can be carried out in the same reactor; and the method has the advantages of reducing working procedures and greatly reducing manpower and equipment costs.

A method for reducing the concentration of cyclohexenone in a cyclohexenone containing organic mixture is disclosed. The method includes contacting an organic mixture comprising cyclohexenone with an effective amount of at least one of sulfurous acid, a salt of sulfurous acid, an alkali hydroxide, or a mixture of two or more of these compounds.

Objects of the present invention are to provide a novel dehydrogenation reaction catalyst, to provide a method that can produce a ketone, an aldehyde, and a carboxylic acid with high efficiency from an alcohol, and to provide a method for efficiently producing hydrogen from an alcohol, formic acid, or a formate, and they are accomplished by a catalyst containing an organometallic compound of Formula (1).

Cyclododecanone (CDON) is prepared by epoxidizing cyclododecene (CDEN) to epoxycyclododecane (CDAN epoxide), and rearranging the CDAN epoxide to CDON to obtain a mixture comprising said CDON and CDEN, wherein CDEN is separated from the CDON-containing mixture and sent to the epoxidation to CDAN epoxide in step a.

The invention discloses an ordered mesoporous carbon encapsulated carbonized metal catalyst for dehydrogenation of alcohols, and a preparation method of the catalyst, and belongs to the technical fields of industrial catalysis and fine organic chemical engineering. According to the invention, a template agent, tannic acid and a metal source are blended, ball milling and self-assembly are carried out, and then high-temperature carbonization is carried out, so that the ordered mesoporous carbon encapsulated carbonized metal catalyst is prepared. The catalyst is used for preparing aldehydes by adehydrogenation reaction of alcohols without oxidizing agents, excellent catalytic activity and selectivity are obtained, and the catalyst can be simply recycled and reused. The preparation catalyst disclosed by the invention has the advantages that the preparation method of the catalyst is simple and convenient, is easy to operate, is free of solvent, has a high speed and can be used for batch production. More importantly, a unique ordered mesoporous confine structure of the catalyst can effectively accelerate the mass transfer of reaction substrates, and the dissolution and agglomeration ofactive components can also be prevented, so that the catalyst is endowed with excellent catalytic performance.

The invention discloses a photocatalyst for preparation of hydrogen and corresponding aldehyde and ketone by means of alcohol decomposition. The photocatalyst comprises a semiconductor photocatalyst and nickel-based nanoparticles loaded on the surface of the semiconductor photocatalyst, wherein the nickel-based nanoparticles are nanoparticles containing one or more of metal nickel, nickel oxide and nickel chloride. The photocatalyst can decompose alcohol into the hydrogen and corresponding aldehyde and ketone at room temperature and normal pressure by means of sunlight, and the apparent quantum yield of the reaction reaches 40%. In addition, the photocatalyst is free of noble metal, low in cost and easy to recycle, the reaction can be conducted under the solvent-free condition, and the generated hydrogen is high in purity and can be used for proton exchange membrane fuel cells.

The present application discloses novel amino-sulfide metal catalysts for organic chemical syntheses including hydrogenation (reduction) of unsaturated compounds or dehydrogenation of substrates. The range of hydrogenation substrate compounds includes esters, lactones, oils and fats, resulting in alcohols, diols, and triols as reaction products. The catalysts of current application can be used to catalyze a hydrogenation reaction under solvent free conditions. The present catalysts also allow the hydrogenation to proceed without added base, and it can be used in place of the conventional reduction methods employing hydrides of the main-group elements. Furthermore, the catalysts of the present application can catalyze a dehydrogenation reaction under homogenous and/or acceptorless conditions. As such, the catalysts provided herein can be useful in substantially reducing cost and improving the environmental profile of manufacturing processes for a variety of chemicals.

The present invention relates to a method for producing an alcohol and/or a ketone from a corresponding alkene(s) in a gas phase in the presence of water vapor by the use of an oxide catalyst. According to the present invention, there is provided a method for producing an alcohol and/or a ketone by bringing a starting material containing an alkene(s), as a gas phase into contact with an oxide catalyst in the presence of water vapor to carry out the reaction, wherein the oxide catalyst satisfies the following requirements: (a) it comprises an oxide(s) of molybdenum and/or tin, and (b) the amount of carbonaceous substances accumulated on the oxide catalyst is controlled to be within a range of 0.1 to 10% by mass, during the reaction.

The invention belongs to the technical field of chemical production, and provides a production method of methyl cyclohexanone. X-oil in caprolactam production waste liquid is used as raw materials; ina fixed bed reactor, a Cu series catalyst is used; catalytic dehydrogenation reaction is performed under the conditions of certain temperature, liquid hourly space velocity and reaction pressure; methyl cyclohexanone products can be obtained through separation. The methylcyclohexanol conversion rate in the raw material X-oil is high; the methyl cyclohexanone selectivity is high. The production process is simple; the catalyst dehydrogenation temperature is low.

The present invention relates to integrated processes for the production of ethylene-butylene copolymers from at least one renewable natural raw material. More specifically, the present invention relates to processes wherein in the ethylene monomer, used in the polymerization for the production of an ethylene copolymer, and the 1-butylene, as the comonomer, is obtained by the ethanol dehydration reaction, which ethanol is produced by the fermentation of sugars, and the 1-butylene comonomer is obtained according to at least one of the following reactions: (i) dehydration reaction of 1-butanol directly produced by the fermentation of sugars, (ii) dehydration reaction of 1-butanol obtained from ethanol via a chemical route, which ethanol is produced by the fermentation of sugars; and/or (iii) dimerization reaction of ethylene produced by the dehydration of ethanol obtained from the fermentation of sugars, followed by isomerization of the 2-butylene isomers then formed.

The ethylene-butylene copolymer thus produced is completely based on carbon atoms originated from renewable natural raw materials and, upon incineration it produces CO₂ from a non-fossil origin.