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Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Roche Vitamins Inc.

Asta Medica, Aktiengesellschaft

Claus Rehren

Karlheinz Drauz

Peter Panster

Thomas Tacke

Monika Berweiler

Herbert Tanner

Horst Bethge

Daniel Ostgard

Roland Moller

Lothar Schneider

Gerhard Sator

G&uuml;nter Stephani

Dietrich Maschmeyer

Frank Hubner

Klaus Stingl

Michael Jansen

Hermanus Gerhardus Jozef Lansink Rotgerink

A process is disclosed for the regeneration of a deactivated wax covered Fischer-Tropsch catalyst, a pumpable suspension of deactivated catalyst being injected into a hot gas stream and the regenerated catalyst then being separated off from the gas stream, optionally further treated by calcination and/or reduction.

Process for the regeneration of a Fischer-Tropsch catalyst

Metal catalysts comprising hollow forms or spheres are made of metal alloy and optionally activated. The metal catalysts can be used for the hydrogenation, dehydrogenation, isomerization reductive alkylation, reductive amination, and/or hydration reaction of organic compounds.

Metal catalysts

The present invention is concerned with a process for the catalytic hydrogenation of organic compounds on a catalyst of amorphous metal alloys and in a solvent, with the hydrogenation being carried out under near-critical or supercritical conditions of the solvent. The amorphous metal alloys can be produced by the shock cooling of alloy melts having eutectic solidification points. By hydrogenation at hydrogen partial pressures between 5 and 400 bar there is obtained outstanding space-time yields with high long-term stability of the catalytic activity.

Catalytic hydrogenation using amorphous metal alloy and a solvent under

The present invention is relative to a method of producing dry thioctic acid in which a raw material in which concentrated thioctic acid is present is treated with liquid or supercritical CO.sub.2, thus yielding thioctic acid with low residual solvent contents in a simple industrial method.

Method of producing dry thioctic acid

There is provided a process for the work-up of this material having the formula ##STR1## because of its poor crystallizability has heretofore been available only with large yield losses. The yield losses are due to the fact that the crystals of this compound are associated with large amounts of residual solvent material which gives rise to complex and expensive drying procedures. In accordance with the present invention the crude LPE is dried by means of fluid or supercritical carbon dioxide which maces it possible to reduce drying times from the previous range of about 124 hours to about 10 hours for the same amount of product and thus produce a dry LPE which has smaller amounts of residual solvent, as well as smaller by-products than that obtained by conventional drying.

Process for the preparation of 1-(N 2-(S)-ethoxycarbonyl)--3

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Aschaffenburg, Germany

Claus Rehren