METHOD FOR LIGNIN PRODUCTION
    144.
    发明公开

    公开(公告)号:EP3693508A1

    公开(公告)日:2020-08-12

    申请号:EP19397504.2

    申请日:2019-02-08

    IPC分类号: D21C11/00 D21C11/04

    摘要: The invention is directed to a method for producing a purified lignin salt from alkaline spent liquor from the chemical cooking of lignocellulosic raw materials. The method comprises the steps of decreasing the spent liquor pH to form a lignin precipitate suspension; filtering the lignin precipitate to form a lignin filter cake and a filtrate; mixing the lignin filter cake into a dilution liquid to form an alkalilignin agglomerate colloid; subjecting the alkalilignin agglomerate colloid to large-pore membrane filtration; and recovering a purified lignin salt concentrate.