Evonik Operations Gmbh

Thyssenkrupp Uhde Gmbh

Evonik Oxeno Gmbh & Co. Kg

Johan Anton

Michael Grass

Johannes Kraft

Peter Kress

Matthias Pascaly

Marc Brendel

Lena Altmann

Thomas Schneider

Michael Hagemann

Franz Schmidt

Andrea Heinroth

Jürgen Schemel

Stefan Wieland

Heiko Morell

Sören Götz

Grzegorz Ziomek

Thomas Noll

The invention provides a process for regenerating a catalyst used for the hydrogenation of an aromatic species, consisting of several steps. First the system is purged with nitrogen, then air is metered in stepwise, and the addition of nitrogen is subsequently ended until only air is present.

Process for regeneration of hydrogenation catalysts

A process prepares dialkyl 1,4-cyclohexanedicarboxylates by ring hydrogenation of the corresponding dialkyl terephthalate having a CO value of less than 0.3 mg KOH/g. The dialkyl 1,4-cyclohexanedicarboxylates thus produced can be used as plasticizers or as a component of a plasticizer composition for plastics, in particular PVC.

Process for preparing dialkyl 1,4-cyclohexanedicarboxylates

The invention provides a process for regenerating a catalyst used for the ring hydrogenation of an aromatic species, especially an aromatic ester, wherein a gas stream containing a particular amount of oxygen is used for the regeneration.

The present invention relates to a process for preparing a pulverulent, porous crystalline metal silicate, comprising the following steps:

Production of pulverulent, porous crystalline metal silicates by means of flame spray pyrolysis

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Dorsten, Germany

Johan Anton