How Alkyl Chain Length of Alcohols Affects Lignin Fractionation and Ionic Liquid Recycle During Lignocellulose Pretreatment

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Date

2015-09-01

Author

SATHITSUKSANOH, Noppadon
Sawant, Manali
TRUONG , Quoc
Tan, Jared
Canlas, Christian G.
Sun, Ning
Zhang, Wei
Renneckar, Scott
Prasomsri, Teerawit
Shi, Jian
Persil Çetinkol, Özgül
Singh, Seema
Simmons, Blake A.
George, Anthe

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Alcohols of increasing alkyl chain length were investigated as precipitants in an ionic liquid (IL) pretreatment system. Switchgrass samples pretreated by 1-ethyl-3-methylimidazolium acetate were characterized after the use of different alkyl chain lengths of alcohols as antisolvents. The resulting IL-pretreated switchgrass (PSG) samples were characterized by enzymatic hydrolysis, cross polarization/magic angle spinning (CP/MAS) C-13 nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), and 2D NMR spectroscopy. Glucan digestibilities of PSG samples were similar to 80 % after 72 h at 5 mg protein g(-1) glucan regardless of the antisolvent used. The use of 1-octanol as an antisolvent, with 10 % water to allow for use of wet biomass, enabled a partial lignin fractionation and multiphase separation for the IL recycle without compromising the chemical structure of the carbohydrates and lignin from the PSG. Lignin fragments were observed in the IL after pretreatment by gel permeation chromatography (GPC). After separation, both the IL and the octanol antisolvent were reused for switchgrass pretreatment and precipitation for an additional 3 cycles. The PSG samples derived from recycled IL were rapidly hydrolyzed, and a high glucan digestibility of 80 % was obtained even at a low enzyme loading of 5 mg protein g(-1) glucan. 2D NMR analysis of residual solids of PSG post-enzymatic hydrolysis revealed that lignin in these residual solids was depolymerized. This strategy enables an ease in separation of pretreated lignocellulosic solids, reduced water use, and recycle of both IL and the antisolvent.

Subject Keywords

Biofuels, Pretreatment, Ionic liquids, Lignin, Ionic liquid recycle

URI

https://hdl.handle.net/11511/42136

Journal

BIOENERGY RESEARCH

DOI

https://doi.org/10.1007/s12155-015-9643-9

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Department of Chemistry, Article

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Citation Formats

N. SATHITSUKSANOH et al., “How Alkyl Chain Length of Alcohols Affects Lignin Fractionation and Ionic Liquid Recycle During Lignocellulose Pretreatment,” BIOENERGY RESEARCH, pp. 973–981, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42136.