ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,521,700, issued on Jan. 13, was assigned to CLARIANT INTERNATIONAL LTD (Muttenz, Switzerland).
"Chromium-free water- and acid-stable catalyst for hydrogenation reactions" was invented by Christoph Doerfelt (Munich), Manuel Pfanzelt (Sauerlach, Germany), Goetz Burgfels (Bad Aibling, Germany), Frank Grossmann (Munich) and Maurice Frederic Pilz (Munich).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an improved chromium-free Cu-Al catalyst for the hydrogenation of carbonyl groups in organic compounds, characterized in that the catalyst contains a proportion of zirconium in an amount of 0.5% to 30.0% by weight. The present in...