Extraction Behaviors of Lignin and Hemicellulose-Derived Sugars During Organosolv Fractionation of Agricultural Residues Using a Bench-Scale Ball Milling Reactor

Tae Hoon Kim, Hyun Kwak, Tae Hyun Kim and Kyeong Keun Oh
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Tae Hoon Kim: R&D Center, SugarEn Co., Ltd., Yongin 16890, Gyeonggi-do, Korea
Hyun Kwak: R&D Center, SugarEn Co., Ltd., Yongin 16890, Gyeonggi-do, Korea
Tae Hyun Kim: Department of Materials Science and Chemical Engineering, Hanyang University, Ansan 15588, Gyeonggi-do, Korea
Kyeong Keun Oh: R&D Center, SugarEn Co., Ltd., Yongin 16890, Gyeonggi-do, Korea

Energies, 2020, vol. 13, issue 2, 1-15

Abstract: Ethanol organosolv fractionation combined with ball milling was conducted on three major agricultural residues: Rice husk (RH), rice straw (RS), and barley straw (BS). The highest lignin extraction yields of RH, RS, and BS were 55.2%, 53.1%, and 59.4% and the purity of lignin recovered was 99.5% for RH and RS, and 96.8% for BS, with similar chemical characteristics, i.e., low molecular weight distributions (1453–1817 g/mol) and poly dispersity index (1.15–1.28). However, considering the simultaneous production of hemicellulose-derived sugars, distinctive fractionation behaviors were shown for the three agricultural residues. The highest hemicellulose-derived sugar yield was 73.8% when RH was fractionated at 170 °C for 30 min. Meanwhile, very low sugar yields of 31.9% and 35.7% were obtained from RS and BS, respectively. The highest glucan-to-glucose conversion yield from enzymatic hydrolysis of fractionated RH reached 85.2%. Meanwhile, the enzymatic digestibility of the fractionated RS and BS was 60.0% and 70.5%, respectively. Consequently, the fractionation efficiency for RH can be improved with fine refinement. For the case of RS, other fractionation process should be applied to achieve effective fractionation performance.

Keywords: biomass; pretreatment; biofuel; biorefinery; sugar-decomposed (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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