Basf Aktiengesellschaft

Klaus Joachim M&uuml;ller-Engel

Otto Machhammer

J&uuml;rgen Schr&ouml;der

Gerhard Nestler

Peter Zehner

Andreas Tenten

Volker Schliephake

Gerhard Wagenblast

Hartmut Hibst

Frank Rosowski

Klaus Harth

Claus Hechler

Harald Keller

Frieder Borgmeier

Bernd Eck

Signe Unverricht

Goetz-Peter Schindler

Heinrich Aichinger

Heiko Arnold

Heinz Friedrich Sutoris

Thomas Jaworek

Theo Proll

In a process for the preparation of acrolein or acrylic acid or a mixture thereof from propane, the propane is subjected, in a first reaction stage, to a partial dehydrogenation under heterogeneous catalysis to give propene, of the components contained in the product gas mixture formed in the first reaction stage other than propene and propane at least a portion of the molecular hydrogen present is then separated off from said mixture and the product gas mixture is then used for the preparation of acrolein and/or acrylic acid by gas-phase catalytic propylene oxidation, molecular nitrogen being present for diluting the reaction gas mixture during the propylene oxidation.

Method for the production of acrolein or acrylic acid or the mixture thereof from propane

In a process for the two-stage catalytic gas-phase oxidation of propene to acrylic acid, the reaction gas starting mixture is passed, in a tube-bundle reactor, with a propene loading of &gE;160 l (S.T.P.) of propene/l&middot;h, first over a fixed catalyst bed present in two successive temperature zones A, B and then over a fixed catalyst bed which is housed either in one further temperature zone C or in two further temperature zones D, E, the temperature of the zone A being kept at a lower temperature than the zone B and the temperature of the zone D at a lower temperature than the zone E.

Method for carrying out the catalytic gas phase oxidation of propene to form acrylic acid

Method for purifying acrylic acid and methacrylic acid

In a process for stabilizing chemical compounds having at least one ethylenically unsaturated bond to undesired free radical polymerization, a nitroxyl radical and a chemical compound containing phosphorus in chemically bonded form are added to the unsaturated compound present as pure substance or as a component of a mixture.

Method for stabilizing chemical compounds containing at least one ethylenically unsaturated bond in order to prevent undesirable radical polymerization

In a process for the preparation of acrylic acid, a product gas mixture obtained by catalytic gas-phase oxidation of a C -precursor of acrylic acid and containing acrylic acid is directly cooled with a quench liquid and then subjected to fractional condensation in a separation column provided with baffles, said product gas mixture ascending into itself and a crude acrylic acid being removed via a side take-off, and the acrylic acid oligomers formed are cleaved and recycled.

Method for producing acrylic acid

Pure acrylic acid is stored and/or transported by a process in which the pure acrylic acid is stored and/or transported as liquid aqueous solution at &lE;15&deg; C.

Method for storing and/or transporting pure acrylic acid

In a process for the preparation of acrolein by gas-phase partial oxidation under heterogeneous catalysis, a reaction gas starting mixture which contains propene and molecular oxygen in a molar C H :O ratio of >1 is reacted in reaction zones connected in series, at elevated temperatures, over solid-state catalysts, further molecular oxygen being added to the reaction gas mixture in the course of the partial oxidation.

Method for producing acrolein by heterogeneous catalytic gas-phase partial oxidation of propene

Growing community of inventors

Stutensee, Germany

Klaus Joachim Müller-Engel

Growing community of inventors

Stutensee, Germany

Klaus Joachim M&uuml;ller-Engel

Klaus Joachim Müller-Engel