ALEXANDRIA, Va., April 21 -- United States Patent no. 12,606,507, issued on April 21, was assigned to Evonik Operations GmbH (Essen, Germany).
"Method for the preparation of 1,2-propanediol" was invented by Holger Wiederhold (Darmstadt, Germany), David Bolz (Frankfurt, Germany) and Jurgen Glenneberg (Offenbach, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for preparing 1,2-propanediol involves reacting propene with hydrogen peroxide in the presence of a catalyst mixture, containing a phase transfer catalyst and a heteropolytungstate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase. The method then involves separating the reactio...