Abstract:
PROBLEM TO BE SOLVED: To provide a method for catalytic gas-phase oxidation of acrolein into acrylic acid, which has no drawbacks of a high-load method of technique level and guarantees a high space time yield of acrylic acid. SOLUTION: In the method for catalytic gas-phase oxidation of acrolein into acrylic acid, the initial mixture of reaction gas, with an acrolein charge of 150 Nl/l h, is fed over a fixed-bed catalyst that is accommodated in two reaction zones A, B arranged in a spatially successive manner, whereby the temperature of reaction zone B is kept at a higher temperature than that of reaction zone A. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for catalytic gas-phase oxidation of propene to acrylic acid. SOLUTION: The reaction gas starting mixture is oxidized, with an increased propene loading, in a first reaction stage, over a first fixed-bed catalyst and then the acrolein-containing product gas mixture of the first reaction stage is oxidized, in a second reaction stage, with an increased acrolein loading, over a second fixed-bed catalyst, the catalyst moldings in both reaction stages having an annular geometry. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for catalytic gas-phase oxidation of propene to acrylic acid.SOLUTION: A reaction gas starting mixture is oxidized, with an increased propene loading, in a first reaction stage, over a first fixed-bed catalyst, and subsequently the acrolein-containing product gas mixture of the first reaction stage is oxidized, in a second reaction stage, with an increased acrolein loading, over a second fixed-bed catalyst, thereby the catalyst moldings in both reaction stages having an annular geometry.
Abstract:
PROBLEM TO BE SOLVED: To provide a new catalytic gas-phase oxidation method of propene to acrylic acid. SOLUTION: There is provided a method for the catalytic gas-phase oxidation of propene to acrylic acid, in which the reaction gas starting mixture is oxidized, with a high propene loading, in a first reaction stage, over a first fixed-bed catalyst which is housed in two successive reaction zones A, B, (the reaction zone B being kept at a higher temperature than the reaction zone A), and the acrolein-containing product gas mixture of the first reaction stage is then oxidized in a second reaction stage, with a high acrolein loading, over a second fixed-bed catalyst which is housed in two successive reaction zones C, D, (the reaction zone D being kept at a higher temperature than the reaction zone C). COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a heterogeneous catalytic gaseous phase oxidation method converting acrolein to acrylic acid, eliminating faults of technical level, and to provide a tube bundle reactor. SOLUTION: There is provided a heterogeneous catalytic gaseous phase oxidation method converting acrolein to acrylic acid, wherein the active materials of the catalyst is a specific multi-element oxidized material produced by a specific heat treatment method, and a bundle reactor comprising a specific number of catalyst tubes, wherein the catalytic tubes are filled with a filler, the catalyst contains as the active materials specific multi-element oxidized materials produced by a specific thermal treatment method, in that case, charge of the catalyst tube relating to partial oxidation converting acrolein to acrylic acid is performed on specific conditions to 12 catalyst tubes sampled at random and, as the standard of the activity of the catalyst tube filler, a temperature to be possessed by a specific salt bath is used. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
Procedimiento para la hidrogenación selectiva de citronelal para dar citronelol, en el cual se conduce una fase líquida, en la que está disuelto el citronelal, y en la que están suspendidas partículas de un catalizador, que sea capaz de proporcionar la hidrogenación preferente de los enlaces dobles de carbono-oxígeno antes que la de los enlaces dobles carbono-carbono, en presencia de un gas que contiene hidrógeno, a través de un dispositivo que inhibe el transporte de las partículas del catalizador, presentando el dispositivo inhibidor del transporte de las partículas del catalizador, orificios o canales, cuyo diámetro hidráulico está comprendido entre 2 y 2.000 veces el diámetro medio de las partículas del catalizador, y la fase líquida comprende, además de amoníaco, una amina primaria, secundaria y/o terciaria así como un diluyente inerte y la concentración en citronelal en la fase líquida está comprendida entre un 50 y un 90% en peso.
Abstract:
The invention relates to a method for producing acrylic acid by the heterogeneously catalysed gas-phase oxidation of propane on a multi-metal oxide mass, said mass containing the elements Mo, V, Te and/or Sb and having a specific X-ray diffractogram.
Abstract:
The invention relates to a method for producing acrylic acid by the heterogeneously catalysed gas-phase oxidation of propane on a multi-metal oxide mass, said mass containing the elements Mo, V, Te and/or Sb and having a specific X-ray diffractogram.