Effect of chlorine atoms in choline chloride-monocarboxylic acid for the pretreatment of oil palm fronds and enzymatic hydrolysis

Tnah, Shen Khang and Wu, Ta Yeong and Ting, Dennis Chiong Chung and Chow, Han Ket and Shak, Katrina Pui Yee and Subramonian, Wennie and Procentese, Alessandra and Cheng, Chin Kui and Teoh, Wen Hui and Jahim, Jamaliah Md (2022) Effect of chlorine atoms in choline chloride-monocarboxylic acid for the pretreatment of oil palm fronds and enzymatic hydrolysis. Renewable Energy, 182. pp. 285-295. ISSN 0960-1481, DOI https://doi.org/10.1016/j.renene.2021.09.068.

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Choline chloride (ChCl) and various monocarboxylic acids (monochloroacetic acid, MCA; dichloroacetic acid, DCA; trichloroacetic acid, TCA) with increasing numbers of substituted chlorine atoms were utilized for the pretreatment of oil palm fronds (OPFs). To the best of our knowledge, this study was the first attempt to utilize these three novel solvents in biomass pretreatment. The result of ChCl:TCA was excluded due to instability in conducting the pretreatment. Under the recommended conditions of 120 degrees C and 60 min, similar delignification percentages of 75.96% and 74.89% were obtained for ChCl:MCA and ChCl:DCA, respectively. Enzymatic hydrolysis of the pretreated OPFs was demonstrated after pre-treatment. By using ChCl:DCA, a shorter duration of enzymatic hydrolysis (24 h) enabled glucan con -version of pretreated OPFs up to 89%. Although a longer duration of 72 h was imposed, glucan conversion of only 82% could be obtained by using ChCl:MCA. Thus, a solvent with a higher number of chlorine atoms (ChCl:DCA) could lead to more effective enzymatic hydrolysis. The results were compared to the literature findings, and ChCl:DCA was determined to be one of the most effective solvents for biomass pretreatment under relatively mild conditions. (C) 2021 Elsevier Ltd. All rights reserved.

Item Type: Article
Funders: Ministry of Higher Education, Malaysia under the Fundamental Research Grant Scheme [FRGS/1/2019/WAB01/MUSM/02/1]
Uncontrolled Keywords: Biomass pretreatment; Biomass valorisation; Biorefinery; Deep eutectic solvent; Lignocellulosic biomass; Waste management
Subjects: T Technology > TD Environmental technology. Sanitary engineering
T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 28 Apr 2022 06:14
Last Modified: 28 Apr 2022 06:14
URI: http://eprints.um.edu.my/id/eprint/33736

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