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Title: Characterization of fractional cuts of co-solvent enhanced lignocellulosic fractionation lignin isolated by sequential precipitation

Journal Article · · Bioresource Technology
 [1];  [2];  [2];  [2]; ORCiD logo [3];  [2];  [2]; ORCiD logo [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of California, Riverside, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We report that lignin valorization is significantly hindered by the intrinsic heterogeneity of its complex structures and variability of biomass feedstocks. Fractionation of lignin can overcome these challenges by producing functionally distinct lignin cuts that can be further tailored to end products. Herein, lignin was extracted and depolymerized from poplar by the co-solvent enhanced lignocellulosic fractionation method with renewable THF to obtain CELF lignin. Several solvents were screened to separate soluble and insoluble fractions from the parent CELF lignin. The ethanol soluble portion was then fractionated into different molecular weight cuts via sequential precipitation of the lignin by reducing the concentration of THF. The physicochemical structures of different CELF lignin cuts were elucidated by GPC and NMR techniques. In conclusio, these results suggest that CELF lignin cuts with lower molecular weight contain progressively higher phenolic and carboxylic acid OH groups, which can be more suitable as green antioxidants than the parent lignin.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-00OR22725; EE0007006
OSTI ID:
1489560
Journal Information:
Bioresource Technology, Journal Name: Bioresource Technology Journal Issue: C Vol. 272; ISSN 0960-8524
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Synthesis, Characterization, and Utilization of a Lignin-Based Adsorbent for Effective Removal of Azo Dye from Aqueous Solution journal February 2020
The Roles of H2O/Tetrahydrofuran System in Lignocellulose Valorization journal February 2020
A simple fractionation method and GPC analysis of organosolv extracts obtained from lignocellulosic materials journal January 2020
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