US Patent Issued to Evonik Oxeno on March 3 for "Method for ring hydrogenation of dialkyl terephthalates with low by-product formation" (German Inventors)

ALEXANDRIA, Va., March 3 -- United States Patent no. 12,565,469, issued on March 3, was assigned to Evonik Oxeno GmbH & Co. KG (Marl, Germany).

"Method for ring hydrogenation of dialkyl terephthalates with low by-product formation" was invented by Horst-Werner Zanthoff (Muelheim a.d. Ruhr, Germany), Julia Bauer (Haltern am See, Germany), Michael Grass (Haltern am See, Germany) and Thomas Schneider (Schermbeck, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A process for ring hydrogenation of dialkyl terephthalates having C3- to C16-alkyl groups can be performed in a hydrogenation unit composed of two reaction units in series. In the process, a suitable process parameter in relation to the first react...