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Process Variable Optimization of Kenaf Two-Stage Fractionation Based on Dilute Hydrochloric Acid Followed by Ethanol Organosolv for Component Separation

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Abstract

Ethanol organosolv (EO) fractionation is a promising technology for producing high-purity lignin from kenaf, a lignocellulosic biomass. However, EO fractionation could not be used for the hemicellulose fraction because of the removal of hemicellulose into black liquor, which is a major drawback. Dilute hydrochloric acid (DHA) fractionation prior to EO fractionation has been proposed as a strategy to overcome this problem. In this study, the hemicellulose fraction of kenaf was maximally fractioned using 0.5% (w/w) HCl at 145 °C for 60 min. Subsequently, the non-washed and dried fibers, the cellulose-lignin fraction, were also fractionated to extract lignin using 60% (v/v) ethanol at 180 °C for 60 min through an optimization process. In each fractionation process, hemicellulose and lignin were removed at 86.11 and 68.86 % from untreated kenaf, respectively. Thus, DHA and EO fractionations are effective procedures to separate the lignin (94.73% purity) and hemicellulosic hydrolysate (19.65 g/L sugar) fractions in addition to cellulose-rich solid (glucan content 80.05%).

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Funding

This work was financially supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (No. 20173030091900).

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Authors and Affiliations

  1. Department of Biomolecular and Chemical Engineering and Interagency Convergence Energy on New Biomass Industry, Hankyong National University, 327, Jungang-ro, Anseong, Gyeonggi-do, 17579, Korea

    Seong Ju Kim

  2. Department of Chemical Engineering and Research Center of Chemical Technology, Hankyong National University, 327, Jungang-ro, Anseong, Gyeonggi-do, 17579, Korea

    Byung Hwan Um

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Kim, S.J., Um, B.H. Process Variable Optimization of Kenaf Two-Stage Fractionation Based on Dilute Hydrochloric Acid Followed by Ethanol Organosolv for Component Separation. Bioenerg. Res. 13, 249–259 (2020). https://doi.org/10.1007/s12155-019-10057-y

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