Production Process and Optimization of Solid Bioethanol from Empty Fruit Bunches of Palm Oil Using Response Surface Methodology

Fahmi, - and Mofijur, M. and Ong, Hwai Chyuan and Jan, Badrul Mohamed and Kusumo, Fitranto and Sebayang, Abdi Hanra and Husin, Hazlina and Silitonga, Arridina Susan and Mahlia, Teuku Meurah Indra and Rahman, S.M. Ashrafur (2019) Production Process and Optimization of Solid Bioethanol from Empty Fruit Bunches of Palm Oil Using Response Surface Methodology. Processes, 7 (10). p. 715. ISSN 2227-9717, DOI

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This study aimed to observe the potential of solid bioethanol as an alternative fuel with high caloric value. The solid bioethanol was produced from liquid bioethanol, which was obtained from the synthesis of oil palm empty fruit bunches (PEFBs) through the delignification process by using organosolv pretreatment and enzymatic hydrolysis. Enzymatic hydrolysis was conducted using enzyme (60 FPUg-1 of cellulose) at a variety of temperatures (35 °C, 70 °C, and 90 °C) and reaction times (2, 6, 12, 18, and 24 h) in order to obtain a high sugar yield. The highest sugars were yielded at the temperature of 90 °C for 48 h (152.51 mg/L). Furthermore, fermentation was conducted using Saccharomyces cerevisiae. The bioethanol yield after fermentation was 62.29 mg/L. Bioethanol was extracted by distillation process to obtain solid bioethanol. The solid bioethanol was produced by using stearic acid as the additive. In order to get high-quality solid bioethanol, the calorific value was optimized using the response surface methodology (RSM) model. This model provided the factor variables of bioethanol concentration (vol %), stearic acid (g), and bioethanol (mL) with a minus result error. The highest calorific value was obtained with 7 g stearic acid and 5 mL bioethanol (43.17 MJ/kg). Burning time was tested to observe the quality of the solid bioethanol. The highest calorific value resulted in the longest burning time. The solid bioethanol has a potential as solid fuel due to the significantly higher calorific value compared to the liquid bioethanol. © 2019 by the authors.

Item Type: Article
Funders: University of Malaya, Malaysia for supporting this research through RU faculty grant (GPF021A-2019) and partnership grant (RK002-2019), School of Information, Systems and Modelling, University of Technology Sydney, Australia, Direktorat Jenderal Penguatan Riset dan Pengembangan Kementerian Riset, Teknologi dan Pendidikan Tinggi Republik Indonesia (Grant No. 147/SP2H/LT/DRPM/2019), Politeknik Negeri Medan, Medan, Indonesia
Uncontrolled Keywords: bioethanol production; organosolv pretreatment; enzyme hydrolysis; solid bioethanol; response surface methodology; calorific value
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 17 Feb 2020 01:01
Last Modified: 17 Feb 2020 01:01

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