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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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      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
      28242203
      S0960-8524(17)30130-X
      10.1016/j.biortech.2017.02.023

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