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Pretreatment and sugar recovery of oil palm fronds using choline chloride:calcium chloride hexahydrate integrated with metal chloride

Eng Kein New, Ta Yeong Wu, Shen Khang Tnah, Alessandra Procentese and Chin Kui Cheng

Energy, 2023, vol. 277, issue C

Abstract: In this study, metal chlorides with different valences, namely potassium chloride (KCl), copper (ii) chloride (CuCl2) and iron (iii) chloride (FeCl3), were used as co-catalysts in a Type II deep eutectic solvent (DES) system, namely, choline chloride:calcium chloride hexahydrate (ChCl:CaCl2·6H2O). After determining their corresponding recommended pretreatment conditions, specific volumetric water content was integrated into the DES + co-catalyst system to aggrandize the pretreatment for oil palm fronds (OPF). At one atmospheric condition, pretreatment of OPF using ChCl:CaCl2·6H2O/1 wt% CuCl2/30 vol% water (115 °C, 1.5 h) and ChCl:CaCl2·6H2O/1 wt% FeCl3/20 vol% water (125 °C, 1.5 h) could produce xylose recovery up to 15.78 g/L (76.42%) and 15.02 g/L (72.74%), respectively. Additionally, both transition metal salt co-catalysts expedited the solvent systems with high lignin (≥50%), xylan (≥85%) and arabinan (∼100%) removal from the OPF. Therefore, applying the studied Type II DES containing co-catalyst while integrated with additional water content had enabled an effective OPF pretreatment for dissolving the ligno-hemicellulose components and expanded a bright horizon for biorefinery processes. A utilization of DES + co-catalyst system could lead to the reduction of energy intensity as compared to the conventional DES system.

Keywords: Biomass valorization; Biorefinery; Deep eutectic solvent; Delignification; Green solvent; Lignocellulosic biomass; Waste management; Wood technology (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:277:y:2023:i:c:s0360544223008800

DOI: 10.1016/j.energy.2023.127486

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