US Patent Issued to YARA INTERNATIONAL ASA on Feb. 10 for "Process for the removal of heavy metals from a phosphoric acid containing composition using an ionic polymeric surfactant and use of said surfactant in the precipitation of heavy metals in a phosphoric acid containing composition" (Norwegian, Polish Inventors)

ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,545,584, issued on Feb. 10, was assigned to YARA INTERNATIONAL ASA (Oslo, Norway).

"Process for the removal of heavy metals from a phosphoric acid containing composition using an ionic polymeric surfactant and use of said surfactant in the precipitation of heavy metals in a phosphoric acid containing composition" was invented by Patrycja Kita (Poznan, Poland), Tanja Vojnovic (Skien, Norway) and Katrine Lie Boyesen (Skien, Norway).

According to the abstract* released by the U.S. Patent & Trademark Office: "Improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an organothiophosphorous heavy metal precipi...