Basf Aktiengesellschaft

Basfaktiengesellschaft

Theo Proll

Otto Machhammer

Bernd Eck

Volker Schliephake

Joachim Thiel

Klaus Br&ouml;llos

Heinrich Hartmann

Alfred Oftring

Klaus Joachim Mueller-Engel

Wolfgang Reuther

Rolf Fikentscher

Toni Dockner

Andreas Tenten

Michael Kroener

Goetz-Peter Schindler

Wolfgang Habermann

Albrecht Dams

Peter Hammes

Willi Schmidt

Werner Bochnitschek

Andreas Hohmann

Klaus Joachim M&uuml;ller-Engel

J&ouml;rg Heilek

Hans-Peter Schildberg

Walter Weisbrodt

Johann Fritzmann

Gerd-Jurgen Engert

Partial oxidation products and/or ammoxidation products of an olefinic hydrocarbon A' are prepared by a process in which said olefinic hydrocarbon is produced during normal operation by partial dehydrogenation and/or oxydehydrogenation of hydrocarbon A and fed in from another source during partial or complete nonoperation of the dehydrogenation and/or oxydehydrogenation.

Method for producing partial oxidation products and/or partial ammoxidation products of at least one olefinic hydrocarbon

A process for the fractional condensation of a gas mixture which, in addition to acrylic acid or methacrylic acid, also contains at least one further condensable component and additionally a high proportion of one or more noncondensable components, wherein the gas mixture is passed through a column having separatory internals and the condensable components are condensed by cooling.

Method for the fractional condensation of a hot gas mixture containing acrylic acid or methacrylic acid and having a high proportion of non-condensable constituents

Method for purifying acrylic acid and methacrylic acid

Method for producing acrylic acid and methacrylic acid

Method for producing acrylic acid

In an industrial process for the heterogeneously catalyzed gas-phase oxidation of propane with molecular oxygen to give acrolein, the feed gas mixture having an initial undiluted molar ratio of the reactants propane:O,of 7:3 is diluted with the reactant propane and, if desired, inert gases in such a way that the feed gas mixture comprises more than 70% by volume of propane and at least 5% by volume of O,.

Industrial process for the heterogeneously catalytic gas-phase oxidation of propane to form acrolein

Acrylic acid or methacrylic acid is purified by

Purification of acrylic acid and methacrylic acid

A process for preparing acrylic acid and/or esters comprises the steps of:

Preparation of acrylic acid and esters

Alkali metal sulfates are electrolyzed to more concentrated solutions of alkali metal hydroxide and sulfuric acid by using a three-compartment electrodialysis cell at temperatures of .gtoreq.70.degree. to .gtoreq.150.degree. C. and current densities of from 0.5 to 15 kA/m.sup.2 using an anion exchange membrane whose polymeric ion exchange matrix comprises a styrene/divinylbenzene copolymer containing very strongly basic quaternary ammonium groups and a hydronium ion blocker, on whose central compartment side is an ion exchange layer or membrane containing tertiary or secondary amino groups.

Electrolysis of alkali metal sulfates

Addition salts of cysteamine with acids are prepared by reacting aziridine with an organic sulfur compound of oxidation state -2 and with a ketone and then subjecting the thiazolidine formed as an intermediate to acid hydrolysis, by a process in which aziridine and the ketone are reacted with ammonium hydrogen sulfide or with a metal hydrogen sulfide with the addition of a moderately strong or strong acid at from -10.degree. to +100.degree. C. and a pH which is greater than or equal to 8.5 is maintained.

Preparation of addition salts of cysteamine with acids

N-Vinylformamide is purified by fractional distillation in the presence of formamide in a column under from 0.5 to 30 mbar by a method in which the distillation is controlled so that N-vinylformamide containing from 0.1 to 15% by weight of formamide is obtained as the distillate. Homopolymers having particularly high molecular weights can be prepared from the N-vinylformamide purified in this manner.

Purification of n-vinylformamide

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Theo Proll