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Title: Fast Fractionation of Technical Lignins by Organic Cosolvents

Abstract

A simple and fast fractionation method was developed to obtain carbohydrate-free lignin with well-defined characteristics, such as narrowly distributed molecular weights and a tunable chemical structure for specific applications. In this study, an industrial softwood kraft lignin and a hardwood CELF lignin (coproduct lignin obtained from cosolvent enhanced lignocellulosic fractionation pretreatment) were dissolved in acetone–methanol and tetrahydrofuran–methanol cosolvents, respectively. Hexane was applied as the antisolvent for sequential precipitation of both lignin preparations. A thorough characterization including various NMR techniques (31P, quantitative 13C, and 2D-HSQC), GPC, DSC and TGA was conducted to correlate the molecular weight of obtained lignin fractions with their structural features including distributions of aliphatic and phenolic hydroxyl groups and relative abundance of interunit linkages. It was found that approximately 10% of the softwood kraft lignin was lignin carbohydrate complexes, and the latter one could be removed efficiently by decreasing polarity of the cosolvent.

Authors:
 [1];  [2];  [3];  [3]; ORCiD logo [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of California, Riverside, CA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1474537
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
ACS Sustainable Chemistry & Engineering
Additional Journal Information:
Journal Volume: 6; Journal Issue: 5; Journal ID: ISSN 2168-0485
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Wang, Yun-Yan, Li, Mi, Wyman, Charles E., Cai, Charles M., and Ragauskas, Arthur J. Fast Fractionation of Technical Lignins by Organic Cosolvents. United States: N. p., 2018. Web. doi:10.1021/acssuschemeng.7b04546.
Wang, Yun-Yan, Li, Mi, Wyman, Charles E., Cai, Charles M., & Ragauskas, Arthur J. Fast Fractionation of Technical Lignins by Organic Cosolvents. United States. https://doi.org/10.1021/acssuschemeng.7b04546
Wang, Yun-Yan, Li, Mi, Wyman, Charles E., Cai, Charles M., and Ragauskas, Arthur J. Sun . "Fast Fractionation of Technical Lignins by Organic Cosolvents". United States. https://doi.org/10.1021/acssuschemeng.7b04546. https://www.osti.gov/servlets/purl/1474537.
@article{osti_1474537,
title = {Fast Fractionation of Technical Lignins by Organic Cosolvents},
author = {Wang, Yun-Yan and Li, Mi and Wyman, Charles E. and Cai, Charles M. and Ragauskas, Arthur J.},
abstractNote = {A simple and fast fractionation method was developed to obtain carbohydrate-free lignin with well-defined characteristics, such as narrowly distributed molecular weights and a tunable chemical structure for specific applications. In this study, an industrial softwood kraft lignin and a hardwood CELF lignin (coproduct lignin obtained from cosolvent enhanced lignocellulosic fractionation pretreatment) were dissolved in acetone–methanol and tetrahydrofuran–methanol cosolvents, respectively. Hexane was applied as the antisolvent for sequential precipitation of both lignin preparations. A thorough characterization including various NMR techniques (31P, quantitative 13C, and 2D-HSQC), GPC, DSC and TGA was conducted to correlate the molecular weight of obtained lignin fractions with their structural features including distributions of aliphatic and phenolic hydroxyl groups and relative abundance of interunit linkages. It was found that approximately 10% of the softwood kraft lignin was lignin carbohydrate complexes, and the latter one could be removed efficiently by decreasing polarity of the cosolvent.},
doi = {10.1021/acssuschemeng.7b04546},
journal = {ACS Sustainable Chemistry & Engineering},
number = 5,
volume = 6,
place = {United States},
year = {Sun Mar 18 00:00:00 EDT 2018},
month = {Sun Mar 18 00:00:00 EDT 2018}
}

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