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Title: Cosolvent pretreatment in cellulosic biofuel production: Effect of tetrahydrofuran-water on lignin structure and dynamics

Journal Article · · Green Chemistry
DOI:https://doi.org/10.1039/C5GC01952D· OSTI ID:1327653
 [1];  [1];  [1];  [1];  [2];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of California, Riverside, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The deconstruction of cellulose is an essential step in the production of ethanol from lignocellulosic biomass. However, the presence of lignin hinders this process. Recently, a novel cosolvent based biomass pretreatment method called CELF (Cosolvent Enhanced Lignocellulosic Fractionation) which employs tetrahydrofuran (THF) in a single phase mixture with water, was found to be highly effective at solubilizing and extracting lignin from lignocellulosic biomass and achieving high yields of fermentable sugars. Here, using all-atom molecular-dynamics simulation, we find that THF preferentially solvates lignin, and in doing so, shifts the equilibrium configurational distribution of the biopolymer from a crumpled globule to coil, independent of temperature. Whereas pure water is a bad solvent for lignin, the THF : water cosolvent acts as a "theta" solvent, in which solvent : lignin and lignin : lignin interactions are approximately equivalent in strength. Furthermore, under these conditions, polymers do not aggregate, thus providing a mechanism for the observed lignin solubilization that facilitates unfettered access of celluloytic enzymes to cellulose.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1327653
Journal Information:
Green Chemistry, Vol. 18, Issue 5; ISSN 1463-9262
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 97 works
Citation information provided by
Web of Science

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Cited By (11)

Solvent Liquefaction book March 2019
Performances of Several Solvents on the Cleavage of Inter- and Intramolecular Linkages of Lignin in Corncob Residue journal April 2018
Atomic Force Microscopy and Molecular Dynamics Simulations for Study of Lignin Solution Self‐Assembly Mechanisms in Organic–Aqueous Solvent Mixtures journal February 2020
Bioethanol from Lignocellulosic Biomass book January 2017
Bioethanol from Lignocellulosic Biomass book July 2018
Structures, intermolecular interactions, and chemical hardness of binary water–organic solvents: a molecular dynamics study journal September 2018
A simple fractionation method and GPC analysis of organosolv extracts obtained from lignocellulosic materials journal January 2020
Molecular-level driving forces in lignocellulosic biomass deconstruction for bioenergy journal October 2018
Neutron scattering in the biological sciences: progress and prospects journal December 2018
Performance of three delignifying pretreatments on hardwoods: hydrolysis yields, comprehensive mass balances, and lignin properties journal September 2019
Recent Trends in the Production, Combustion and Modeling of Furan-Based Fuels journal February 2018

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