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    • 3. 发明公开
    • A METHOD FOR RECOVERING LOW MOLECULAR WEIGHT LIGNIN FROM A FILTRATE
    • VERFAHREN ZURRÜCKGEWINNUNGVON LIGNIN MIT GERINGEMMOLEKÜLGEWICHTAUS EINEM FILTRAT
    • EP2888272A1
    • 2015-07-01
    • EP13759800.9
    • 2013-08-22
    • UPM-Kymmene Corporation
    • VALKONEN, SannaESKELINEN, KatiKOITTO, Juha-PekkaLEPPÄNEN, Jenni
    • C07G1/00
    • C07G1/00D21C11/0007
    • The invention relates to a method for recovering low molecular weight lignin from a filtrate, wherein the low molecular weight lignin includes lignin molecules having a molecular weight of 3000 g/mol or lower, wherein the filtrate is obtained from a process where lignin is precipitated from black liquor and the formed precipitate is separated therefrom by filtration resulting in the filtrate including low molecular weight lignin being formed, and wherein the method includes the following steps: a) adjusting the pH of the filtrate to a value of 3-4 for precipitating lignin in the filtrate; b) separating the precipitated lignin from the filtrate; c) reslurrying the separated lignin until the dry solids content of the slurry is 25-40 weight-% and adjusting the pH of the slurry to a value of 2-3; d) washing the slurry; and e) separating the lignin from the slurry.
    • 本发明涉及从滤液中回收低分子量木质素的方法,其中低分子量木质素包括分子量为3000g / mol或更低的木质素分子,其中滤液是从木质素从 通过过滤将形成的沉淀物从其中分离出来,形成含有低分子量木质素的滤液,其中该方法包括以下步骤:a)将沉淀木质素的滤液pH值调整至3-4 在滤液中 b)将沉淀的木质素与滤液分离; c)将分离的木质素再浆化,直到浆料的干固体含量为25-40重量%,并将浆料的pH调节至2-3; d)清洗浆料; 和e)从浆料中分离木质素。