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Enhancement of enzymatic digestibility of oil palm empty fruit bunch by ionic-liquid pretreatment

Author

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  • Katinonkul, Watcharee
  • Lee, Jin-Suk
  • Ha, Sung Ho
  • Park, Ji-Yeon

Abstract

In this study, 4-methylmorpholine N-oxide (NMMO) and four ionic liquids were compared to determine the most suitable type for use in pretreatment of oil palm empty fruit bunch (EFB) to enhance enzymatic digestibility and obtain maximal fermentable sugar (glucose). Four types of ionic liquids, namely, 1-ethyl-3-methyl imidazolium acetate ([Emim]OAc), 1-butyl-3-methyl imidazolium chloride ([Bmim]Cl), tributyl methyl ammonium methylsulfate (MTBS), and 1-ethyl-3-methyl imidazolium diethylphosphate ([Emim]DEP), were used. The effects of pretreatment temperature and time on the enzymatic digestibility of EFB were examined. Among NMMO and four ionic liquids, NMMO and [Emim]OAc, showing high enzymatic digestibility, were found to be most effective for EFB pretreatment. The enzymatic digestibility of NMMO-pretreated EFB increased as pretreatment temperature and time increased. After [Emim]OAc pretreatment, the crystallinity index of EFB decreased, due to the conversion of crystalline cellulose to amorphous cellulose, and the enzymatic digestibility thereby was increased to 96.6% at 110 °C for 2 h.

Suggested Citation

  • Katinonkul, Watcharee & Lee, Jin-Suk & Ha, Sung Ho & Park, Ji-Yeon, 2012. "Enhancement of enzymatic digestibility of oil palm empty fruit bunch by ionic-liquid pretreatment," Energy, Elsevier, vol. 47(1), pages 11-16.
    • Handle: RePEc:eee:energy:v:47:y:2012:i:1:p:11-16
    DOI: 10.1016/j.energy.2012.06.050
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    Cited by:

    1. Ahmad, Farah B. & Zhang, Zhanying & Doherty, William O.S. & O'Hara, Ian M., 2019. "The outlook of the production of advanced fuels and chemicals from integrated oil palm biomass biorefinery," Renewable and Sustainable Energy Reviews, Elsevier, vol. 109(C), pages 386-411.
    2. Tan, Inn Shi & Lee, Keat Teong, 2014. "Enzymatic hydrolysis and fermentation of seaweed solid wastes for bioethanol production: An optimization study," Energy, Elsevier, vol. 78(C), pages 53-62.
    3. Tye, Ying Ying & Leh, Cheu Peng & Wan Abdullah, Wan Nadiah, 2017. "Total glucose yield as the single response in optimizing pretreatments for Elaeis guineensis fibre enzymatic hydrolysis and its relationship with chemical composition of fibre," Renewable Energy, Elsevier, vol. 114(PB), pages 383-393.
    4. Yoon, S.-Y. & Han, S.-H. & Shin, S.-J., 2014. "The effect of hemicelluloses and lignin on acid hydrolysis of cellulose," Energy, Elsevier, vol. 77(C), pages 19-24.

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