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      Separation of saccharides from prehydrolysis liquor of lignocellulose to upgrade dissolving pulp mill into biorefinery platform.

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          Abstract

          In this work, a competitive process consisting of polyelectrolyte flocculation, active carbon absorption, and ion exchange was developed for hemicelluloses-derived saccharides (HDSs) purification from prehydrolysis liquor (PHL) of lignocellulose. Results showed that colloidal lignin counted for 20% of non-saccharide compounds (NSCs) and could be eliminated by flocculation at 500mg/L polyaluminium chloride and 50mg/L anionic polyacrylamide. Active carbon was very effective for decoloration of flocculation-treated PHL, but showed limited absorption selectivity toward NSCs. Lignin, the dominant component of NSCs, is characterized with phenolic hydrogen groups. Phenolic lignin could be easily captured by anion exchange resin with 80% removal. The proposed process showed great industrial potential because of the high value saccharides, but also low molecular phenolic lignin.

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          Author and article information

          Affiliations
          [1 ] College of Papermaking Science and Technology, Tianjin University of Science & Technology, Tianjin 300457, China.
          [2 ] Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
          [3 ] College of Papermaking Science and Technology, Tianjin University of Science & Technology, Tianjin 300457, China. Electronic address: liqun@tust.edu.cn.
          Journal
          Bioresour. Technol.
          Bioresource technology
          Elsevier BV
          1873-2976
          0960-8524
          Aug 2017
          : 237
          S0960-8524(17)30130-X
          10.1016/j.biortech.2017.02.023
          28242203

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