US Patent Issued to Evonik Operations on June 30 for "Method for the preparation of 1,2-propanediol and dipropylene glycol" (German Inventors)

ALEXANDRIA, Va., July 16 -- United States Patent no. 12,668,560, issued on June 30, was assigned to Evonik Operations GmbH (Essen, Germany).

"Method for the preparation of 1,2-propanediol and dipropylene glycol" was invented by Holger Wiederhold (Darmstadt, Germany) and David Bolz (Frankfurt, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for preparing 1,2-propanediol and dipropylene glycol involves continuously 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, to obtain 1,2-propanediol and ...