METOD FÖR RENING AV LIGNIN

Patentradars sammanfattning

Stora Enso's invention addresses the challenge of removing metals (Na, K, Ca, Mg, Al, Fe, Mn) from kraft lignin intended for high-purity applications such as carbon fibers, carbon powders, and energy storage devices. The core method immerses solid lignin particles in an acidic aqueous solution (pH<6, preferably using organic acids such as formic or oxalic acid) at 40–100°C for 1–4 hours, followed by filtration and optional washing, without dissolving the lignin. The resulting purified lignin achieves a total metal content below 200 ppm (preferably <100 ppm) from starting materials containing 500–5000 ppm metals, representing a reduction of at least 60–80%. The process is designed to be compatible with existing LignoBoost infrastructure for large-scale manufacturing.

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