Basf Aktiengesellschaft

Herbert Vogel

Otto Machhammer

Andreas Tenten

Wilhelm Ruppel

Hans-Peter Neumann

Werner Hefner

Herbert Exner

Rolf Hartmuth Fischer

Franz Merger

Ulrich Hammon

Martin Fischer

Matthias Schwarzmann

Richard Krabetz

Gerd Duembgen

Fritz Thiessen

Karl-Heinz Boehning

Klaus Herzog

Stefan Boeck

Klaus Ebel

Hans-Josef Sterzel

Gerhard Nestler

Wolfgang Harder

Toni Dockner

Eugen Gehrer

Detlef Kratz

Holger Herbst

Hans Martan

Helmut Lermer

Carsten Groening

Gerd Bohner

Bernhard Knuth

Brudermuller

Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by distillation.

Purification of crude (meth) acrylic acid

In a process for the continuous heterogeneously catalyzed gas-phase partial oxidation of an organic compound in an oxidation reactor, whose feed gas mixture comprises, apart from the organic compound to be partially oxidized and molecular oxygen as oxidant, at least one diluent gas which is essentially inert under the conditions of the heterogeneously catalyzed gas-phase partial oxidation, where the essentially inert diluent gas consists partly of combustible gases, after passage through the oxidation reactor, the combustible constituents of the inert diluent gas present in the product gas stream leaving the oxidation reactor are not recirculated to the heterogeneously catalyzed gas-phase partial oxidation, but are put to further use for the purposes of another chemical reaction.

Continuous heterogeneously catalyzed gas-phase partial oxidation of an

Process for regenerating a silver catalyst deactivated by coking during the gas phase epoxidation of 1,3-butadiene by reacting the coked catalyst with a gas mixture containing at least 5% by volume of water vapor and up to 95% by volume of oxygen at temperatures of from 100 to 500 .degree. C.

Regeneration of catalyst used in the preparation of 3,4-epoxy-1-butene

In a process for preparing acrolein, acrylic acid or a mixture thereof from propane, propane is partially dehydrogenated to propylene in a first stage, the product gas mixture resulting therefrom is, after separating off hydrogen and water vapor, used as feed to an oxidation reactor, the propylene formed in the dehydrogenation is partially oxidized in the oxidation reactor using molecular oxygen in the presence of non-dehydrogenated propane as inert diluent gas to give acrolein, acrylic acid or a mixture thereof and the propane present in the product gas mixture of the partial oxidation is subsequently recirculated to the dehydrogenation stage A.

Preparation of acrolein, acrylic acid or a mixture thereof from propane

In a process for the continuous heterogeneously catalyzed gas-phase oxidation of propylene to acrolein, acrylic acid or a mixture thereof in an oxidation reactor whose feed gas mixture comprises, apart from propylene and molecular oxygen as oxidant, only at least one diluent gas which is essentially inert under the conditions of the heterogeneously catalyzed gas-phase oxidation and where, in continuous operation, at least a part of the essentially inert diluent gases present in the product gas mixture is separated off therefrom and is reused as a constituent of the feed gas mixture to the oxidation reactor, the essentially inert diluent gas mixture comprises more than 85% by volume of at least one saturated hydrocarbon having from 1 to 5 carbon atoms.

Continuous heterogeneously catalyzed gas-phase oxidation of propylene to

Preparation of 3,4-epoxy-1-butene

A process for the preparation of lactates by fermentation of mixtures containing sugars, conversion of the lactic acid obtained during fermentation to its salts, followed by esterification, in which

Preparation of lactates

A process for preparing dihydroxyacetone by condensation, catalyzed by a thiazolium ylide, of formaldehyde, wherein the reaction is carried out in a system composed of an aqueous phase and at least one organic liquid phase.

Preparation of dihydroxyacetone

Methacrolein is removed from a gaseous mixture by absorption by means of an aqueous solution which contains from 60 to 90% by weight of methacrylic acid.

Removal of methacrolein from a gaseous mixture

Compositions of the formula Mo.sub.12 P.sub.a V.sub.b X.sup.1 c X.sup.2

Compositions of the formula MO.sub.12 P.sub.a V.sub.b X.sup.1.sub.c

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Ludwigshafen, Germany

Herbert Vogel