US Patent Issued to VALMET on Oct. 27 for "Method and system for lignin production" (Swedish Inventors)

ALEXANDRIA, Va., Oct. 27 -- United States Patent no. 12,774,557, issued on Oct. 27, was assigned to VALMET AB (Sundsvall, Sweden).

"Method and system for lignin production" was invented by Henrik Wallmo (Alingsas, Sweden) and Anders Littorin (Hisings-Karra, Sweden).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to separation of lignin from an aqueous slurry containing lignocellulosic biomass material, such as black liquor, comprising the steps of providing an aqueous slurry having an initial pH level to a first precipitation phase, where the first precipitation phase is performed during a first time duration including adding a first acidifier. Thereby, a decrease in the pH value of the a...