Abstract:
PROBLEM TO BE SOLVED: To provide a continuous heterogeneously catalyzed partial dehydrogenation of a hydrocarbon in the gas phase and in the presence of molecular oxygen, in which a part of a product gas is recirculated to a reaction zone, and a reactor for carrying out such a process. SOLUTION: In the process, a reaction gas containing at least one hydrocarbon to be dehydrogenated is supplied to the reaction zone; the reaction gas is passed in the reaction zone through at least one fixed catalyst bed, wherein the reaction gas is subjected to catalytic dehydrogenation to produce molecular hydrogen and at least one partial dehydrogenated hydrocarbon; the reaction gas, before and/or after entering the reaction zone, is added with a gas containing at least one molecular oxygen-containing gas; the molecular oxygen partially oxidizes the molecular hydrogen contained in the reaction gas in the reaction zone to form water steam; a gas product containing the molecular hydrogen, water steam, at least one dehydrogenated hydrocarbon, and at least one hydrocarbon to be dehydrogenated is withdrawn from the reaction zone; at least one hydrocarbon to be dehydrogenated in the gas phase is partially dehydrogenated by a continuous heterogeneous catalyst. In the partial dehydrogenation method using the continuous heterogeneous catalyst, the reaction gas withdrawn from the reaction zone is divided into two parts being the same in composition, one of which is recycled into reaction zone as a circulating gas. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a reaction vessel having high resistance to a thermal cycle (high resistance to long time embrittlement, carburization, metal dusting) and capable of reducing undesired catalysis effects, and to provide a method for a serial partial dehydrogenation of hydrocarbon by a heterogeneous catalyst with using the reaction vessel.SOLUTION: In a catalytic dehydrogenation of a hydrocarbon such as propane to an unsaturated hydrocarbon such as propene, a reaction vessel of which an inner surface of a reaction chamber consists of steel containing Cr: 18 to 30 mass%, Ni: 9 to 37 mass%, Si: 1 to 4 mass% and the like and an outer surface at opposite side of the reaction chamber is made from a composite material metal-plated on a steel containing Cr: 15 to 20 mass%, Ni: 6 to 18 mass%, Si: 0 to 0.8 mass% and the like directly or through layers of copper, nickel or copper and nickel is used. A method of a serial partial dehydrogenation of hydrocarbon by a heterogeneous catalyst with using the reaction vessel is provided.
Abstract:
PROBLEM TO BE SOLVED: To provide a long-term implementation method of a continuously implemented partial heterogeneous catalytic dehydrogenation of a to-be-dehydrogenated hydrocarbon.SOLUTION: A reactive gas mixture flow including a to-be-dehydrogenated hydrocarbon of a starting molar quantity HC is transmitted through a total catalyst bed including a dehydrogenation catalyst at a total sum M, and in a case where the implementation period proliferates, the deactivation of the total catalyst bed is attenuated by decreasing the conversion contribution of the first of three zones of the dehydrogenation catalyst of the total sum M along the fluidizing direction thereof, by increasing the conversion contribution of the last of the three zones of the dehydrogenation catalyst of the total sum M along the fluidizing direction thereof, and by maximizing the conversion contribution of the second of the three zones of the dehydrogenation catalyst of the total sum M along the fluidizing direction thereof.
Abstract:
Provided is a method of production of catalyst support particles, containing zirconium dioxide and optionally silicon oxide, comprising the steps: (i) preparation of a solution containing precursor compounds of zirconium dioxide and optionally of silicon dioxide, (ii)conversion of the solution to an aerosol, (iii)bringing the aerosols into a directly or indirectly heated pyrolysis zone, (iv) carrying out the pyrolysis, (v)separation of the catalyst particles formed from the pyrolysis gas.
Abstract:
The present invention relates to a reactor for the photocatalytic treatment of liquid or gas currents, comprising a pipe which the current to be treated flows through. At least one light source, at least one planar means M1 and at least one planar means M2 are arranged inside said pipe, wherein M1 has at least one photocatalytically active material and M2 reflects the light radiation emitted from the at least one light source. The reflective surface of the at least one means M2 and the inner wall of the pipe together form an angle that is greater than or equal to 0°, such that the light emitted from the light source is reflected from the at least one means M2 onto the photocatalytically active material. The invention further relates to a method for the photocatalytic treatment of liquid or gas currents by irradiation of light in the reactor according to the invention.
Abstract:
The invention relates to a method for producing coated nanoparticles which comprise a core holding at least one first substance and at least one envelope from at least one additional substance that at least partially surrounds the core, in a fluid system. The invention also relates to nanoparticles obtainable by said method, to nanoparticles comprising a non-porous core that holds at least one first substance, and at least one envelope from at least one additional substance that at least partially surrounds the core, the nanoparticles having a narrow particle-size distribution. The invention finally relates to the use of the nanoparticles in photocatalysis and to a device for carrying out the method.
Abstract:
A process for producing propylene oxide comprising reacting propene with hydrogen peroxide in the presence of a catalyst to give a mixture (Gl) comprising propylene oxide, unreacted propene, and oxygen; separating propylene oxide from mixture (Gl) to give a mixture (GII) comprising propene and oxygen; and adding hydrogen to mixture (GII) and reducing the oxygen comprised in mixture (GII) at least partially by reaction with hydrogen in the presence of a catalyst comprising copper in elemental and/or oxidic form on a support, wherein copper is present on the support in an amount of 30 to 80 wt.-% based on the whole catalyst and calculated as CuO.
Abstract:
The present invention relates to a method for purifying a contaminant-laden current by bringing the current to be purified in contact with a heterogeneous photocatalyst and irradiating it with light, wherein it is brought into contact in the presence of at least one compound, which is dissolved in the current and contains at least one metal selected from the group consisting of iron, chromium, nickel, cobalt, manganese, and mixtures thereof, and to the use of a heterogeneous photocatalyst for purifying a contaminant-laden current, wherein at least one compound containing at least one metal selected from the group consisting of iron, chromium, nickel, cobalt, manganese, and mixtures thereof, is present in dissolved form in the current to be purified.