ALEXANDRIA, Va., May 26 -- United States Patent no. 12,636,591, issued on May 26, was assigned to GEA Wiegand GmbH (Ettlingen, Germany).
"Facility and method for purifying recovered NMP" was invented by Jorg Becker (Karlsruhe, Germany) and Ralf Leibig (Hambrucken, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a facility for purifying recovered NMP from lithium-ion battery production, comprising a first column for separating low-boiling impurities, comprising a supply, in its central part, for the recovered NMP, and which can be heated by means of a first evaporator for supplying thermal energy; and a second column for separating high-boiling impurities, a connection ...