The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2022
Filed:
May. 14, 2018
Covestro Deutschland Ag, Leverkusen, DE;
Andre Rittermeier, Bochum, DE;
Michael Venz, Dormagen, DE;
Thomas Burbach, Bedburg, DE;
Timm Schmidt, Neuss, DE;
Tim Loddenkemper, Dormagen, DE;
Frank Gerhartz, Leverkusen, DE;
Walther Müller, Pulheim, DE;
COVESTRO DEUTSCHLAND AG, Leverkusen, DE;
Abstract
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.