Covestro Deutschland Ag

Bayer Materialscience Ag

Timm Schmidt

Tim Loddenkemper

Frank Gerhartz

Walther Müller

Andre Rittermeier

Michael Venz

Thomas Burbach

A process for regenerating a catalyst containing ruthenium or ruthenium compounds, which includes, optionally at elevated temperature, subjecting the catalyst to a hydrogen halide treatment, particularly a gas stream comprising hydrogen chloride, under non-oxidative conditions and, optionally at reduced temperature, to at least a two-stage oxidative post-treatment. The catalyst may have been poisoned by sulfur compounds. After the removal of sulfur, the catalyst is subjected to an oxidative post-treatment.

Method for regenerating a toxified catalyst containing ruthenium or ruthenium compounds

Processes comprising: providing a catalyst comprising a catalytic component selected from the group consisting of ruthenium, ruthenium compounds, and combinations thereof, wherein the catalyst is sulfur-poisoned with one or more sulfur compounds; and treating the catalyst with a gas stream comprising a hydrogen halide under nonoxidative conditions such that the catalyst is regenerated.

Processes for regenerating sulfur-poisoned, ruthenium and/or ruthenium compound-containing catalysts

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Neuss, Germany

Timm Schmidt