US Patent Issued to Changchun Meihe Science and Technology Development on April 29 for "Method for refining bio-based propylene glycol" (Chinese Inventor)

ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,393, issued on April 29, was assigned to Changchun Meihe Science and Technology Development Co. Ltd. (Changchun, China).

"Method for refining bio-based propylene glycol" was invented by Yi Yuan (Changchun, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention provides a process for refining bio-based propylene glycol, wherein impurities having boiling points close to that of propylene glycol are separated. In this process, C5-C20 oleophilic alcohol compounds, C5-C20 alkanes and/or C4-C20 oleophilic ketone compounds are subjected to azeotropism as an azeotropic solvent together with the bio-based propylene glycol to obtain an azeotrope co...