Relationship between lignocellulosic biomass dissolution and physicochemical properties of ionic liquids composed of 3-methylimidazolium cations and carboxylate anions

Moyer, Preenaa; Smith, Micholas Dean; Abdoulmoumine, Nourredine; Chmely, Stephen C.; Smith, Jeremy C.; Petridis, Loukas; Labbé, Nicole

doi:10.1039/C7CP07195G

Title: Relationship between lignocellulosic biomass dissolution and physicochemical properties of ionic liquids composed of 3-methylimidazolium cations and carboxylate anions

Journal Article · Tue Jan 02 00:00:00 EST 2018 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/C7CP07195G· OSTI ID:1423012

Moyer, Preenaa ^[1]; Smith, Micholas Dean ^[2]; Abdoulmoumine, Nourredine ^[1]; Chmely, Stephen C. ^[3]; Smith, Jeremy C. ^[2]; Petridis, Loukas ^[2]; Labbé, Nicole ^[3]

Univ. of Tennessee, Knoxville, TN (United States). Center for Renewable Carbon. Dept. of Biosystems Engineering and Soil Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Molecular Biophysics; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Biochemistry and Cellular and Molecular Biology
Univ. of Tennessee, Knoxville, TN (United States). Center for Renewable Carbon

The ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([EMIM]Acetate) has been widely used for biomass processing, i.e., to pretreat, activate, or fractionate lignocellulosic biomass to produce soluble sugars and lignin. However, this IL does not achieve high biomass solubility, therefore minimizing the efficiency of biomass processing. In this paper, [EMIM]Acetate and three other ILs composed of different 3-methylimidazolium cations and carboxylate anions ([EMIM]Formate, 1-allyl-3-methylimidazolium ([AMIM]) formate, and [AMIM]Acetate) were analyzed to relate their physicochemical properties to their biomass solubility performance. While all four ILs are able to dissolve hybrid poplar under fairly mild process conditions (80 °C and 100 RPM stirring), [AMIM]Formate and [AMIM]Acetate have particularly increased biomass solubility of 40 and 32%, respectively, relative to [EMIM]Acetate. Molecular dynamics simulations suggest that strong interactions between IL and specific plant biopolymers may contribute to this enhanced solubilization, as the calculated second virial coefficients between ILs and hemicellullose are most favorable for [AMIM]Formate, matching the trend of the experimental solubility measurements. The simulations also reveal that the interactions between the ILs and hemicellulose are an important factor in determining the overall biomass solubility, whereas lignin–IL interactions were not found to vary significantly, consistent with literature. Finally, the combined experimental and simulation studies identify [AMIM]Formate as an efficient biomass solvent and explain its efficacy, suggesting a new approach to rationally select ionic liquid solvents for lignocellulosic deconstruction.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; 151181

OSTI ID:: 1423012

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 20, Issue 4; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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