Abstract:
A process for producing a carbonyl compound involves allowing water to undergo phase transition to a supercritical or subcritical state in the presence of an alcohol compound so as to produce/generate water-derived hydrogen and at the same time convert the alcohol compound into a corresponding carbonyl compound. Specifically, the process is carried out by introducing the alcohol in a reaction tube along with water and heating and/or pressurizing the mixture of the alcohol and the water to bring the water into a subcritical or supercritical state. In this manner, water-derived hydrogen is produced and the alcohol is converted to a corresponding carbonyl compound. The process is preferably carried out in an oxygen-free environment.
Abstract:
A reactor comprising a reacting vessel 31 that contains a fluid including high temperature and high pressure water under target reaction temperature and reaction pressure condition and performs a reaction treatment to a reactant by the fluid, a first pipe 25 connected to the reacting vessel 31 to supply the reactant to the reacting vessel 31, and a first partition means 50 for partitioning between first pipe 25 and the reacting vessel 31 so as to prevent a leakage of any one of the fluid, the reactant, and a reaction product from the reacting vessel 31 side to the first pipe 25 side. The first partition means 50 is comprised of for example a valve 51, a shaft 52, a weight 53, a supporting member 54, and a pipe 55, and normally, due to the weight 53, the valve 51 closes an opening of a bottom end of the pipe 55. That is, it isolates the pipe 55 and the inside of the reacting vessel 31. At this time, although the valve 51 does not completely seal up the inside of the reacting vessel 31, it has the ability to prevent a large amount of hot water HW in the reacting vessel 31 from leaking into the pipe 25 due to a convection current thereof.
Abstract:
The present invention relates to a process for carrying out olefin ring-closing metathesis (RCM) wherein compressed carbon dioxide (gaseous, liquid or supercritical) acts as solvent for the liquid or solid reactant and the products obtained therefrom, while additionally one or more ionic liquids are introduced as the 2nd phase in which homogeneous olefin metathesis catalysts are immobilised.
Abstract:
A novel process of producing gas fuel is provided, in which low quality fuel such as coal and various kinds of plastics and resins (polymeric compounds) collected as flame retardant waste are decomposed to gas in supercritical water, so that the resultant gas is effectively utilized as fuel. That is, polymeric compounds and aromatic/condensed-aromatic hydrocarbons are decomposed in supercritical water with ruthenium oxide (IV) as a catalyst. The resultant gas components through the decomposition are collected as gas fuel.
Abstract:
A method of forming a thin-film including a capability to remove contaminants from the formed thin-film and/or a substrate on which the thin-film is formed using alcohol. The method includes allowing a substrate holder to support a substract. A first mixture is produced by mixing a condensation polymer containing an element of metal oxide compound and alcohol. Then second mixture is produced by mixing supercritical fluid or liquid carbon dioxide and the first mixture. A thin film is formed by applying the second mixture on a surface of the substrate. After forming the thin-film, the substrate is cleaned by applying alcohol to upper and lower surfaces, preferably the whole upper and lower surfaces, of the substract. The thin-film is crystallized by heating, and the crystallizing may include applying oxygen in a crystallizing chamber. Soft X-rays may be applied to the substrate, during the forming of the thin-film on the surface of the substrate.
Abstract:
The invention relates to a method of manufacturing a product having a sub-micron primary particle such as metal oxide, metal oxidhydroxide or metal hydroxide product, said method comprising the steps of: introducing a solid reactor filling material in a reactor, introducing a metal-containing precursor in said reactor, introducing a co-solvent into the said reactor, introducing a supercritical solvent in the said reactor. By these steps a contact between the metal-containing precursor and the co-solvent is established, thus resulting in the formation of said product in the proximity of the said solid reactor filling material. The present invention offers the astonishing possibility of producing anatase phase of TiO2 at temperatures as low as between 50° C. and 100° C. and at concurrent pressures of 100-200 bar. The invention also relates to a product such as anatase TiO2 produced by the method and also relates to an apparatus utilising the method.
Abstract:
Fluoropolymer materials containing tetrafluoroethylene monomers, such as PTFE, are significantly swollen by supercritical carbon dioxide at high temperatures and pressures. The swollen fluoropolymer is processable by molding, extrusion, and other techniques. In addition, the fluoropolymer may be sintered at significantly lower temperatures compared to a nonswollen fluoropolymer material. The melting temperature of fluorinated polymers containing tetrafluoroethylene and triflouroethylene monomers which are swollen with supercritical carbon dioxide is significantly reduced, thereby permitting manufacturing operations such as extruding and molding to be performed at lower temperatures and with reduced risk of decomposition.
Abstract:
A process for producing a carbonyl compound involves allowing water to undergo phase transition to a supercritical or subcritical state in the presence of an alcohol compound so as to produce/generate water-derived hydrogen and at the same time convert the alcohol compound into a corresponding carbonyl compound. Specifically, the process is carried out by introducing the alcohol in a reaction tube along with water and heating and/or pressurizing the mixture of the alcohol and the water to bring the water into a subcritical or supercritical state. In this manner, water-derived hydrogen is produced and the alcohol is converted to a corresponding carbonyl compound. The process is preferably carried out in an oxygen-free environment.
Abstract:
A capsule for containing at least one reactant and a supercritical fluid in a substantially air-free environment under high pressure, high temperature processing conditions. The capsule includes a closed end, at least one wall adjoining the closed end and extending from the closed end; and a sealed end adjoining the at least one wall opposite the closed end. The at least one wall, closed end, and sealed end define a chamber therein for containing the reactant and a solvent that becomes a supercritical fluid at high temperatures and high pressures. The capsule is formed from a deformable material and is fluid impermeable and chemically inert with respect to the reactant and the supercritical fluid under processing conditions, which are generally above 5 kbar and 550° C. and, preferably, at pressures between 5 kbar and 80 kbar and temperatures between 550° C. and about 1500° C. The invention also includes methods of filling the capsule with the solvent and sealing the capsule, as well as an apparatus for sealing the capsule.
Abstract:
A palladium-catalysed carbon-carbon bond forming reaction in compressed carbon dioxide is provided wherein at least one of the reagents used in said reaction is bounded to a solid polymer support. In a second aspect, a palladium-catalysed carbon-carbon bond forming reaction in compressed carbon dioxide is provided wherein said reaction is performed in the presence of a tetra-alkylammonium acetate. In a third aspect, a palladium-catalysed carbon-carbon bond forming reaction in compressed carbon dioxide is provided wherein said palladium catalyst does not have any fluorinated phosphine ligands but does have at least one phosphine ligand that has at least one substituent that is selected from tert-alkyl groups, cycloalkyl groups and optionally substituted phenyl groups or 1′-diphenylphosphino-biphenyl. In a fourth aspect, there is provided a palladium-catalysed Suzuki or Heck reaction in compressed carbon dioxide wherein both of the substrates being combined in said reactions are boronic acids.