ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,253, issued on Nov. 18, was assigned to Covestro Deutschland AG (Leverkusen, Germany).
"Method for operating a plant for continuous production of an isocyanate" was invented by Dietmar Wastian (Dormagen, Germany), Anke Hielscher (Cologne, Germany), Juergen Spriewald (Cologne, Germany) and Achim Wildermuth (Neuss, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a method for operating a plant for continuous production of an isocyanate by converting a primary amine A with phosgene P whilst maintaining, based on the amino groups of the primary amine, a stoichiometric excess of phosgene in the presence of a solvent...