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 center dot 6H(2)O). 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 center dot 6H(2)O/1 wt% CuCl2/30 vol% water (115 degrees C, 1.5 h) and ChCl:CaCl2 center dot 6H(2)O/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 (similar to 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.

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

Procentese, Alessandra;
2023-01-01

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 center dot 6H(2)O). 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 center dot 6H(2)O/1 wt% CuCl2/30 vol% water (115 degrees C, 1.5 h) and ChCl:CaCl2 center dot 6H(2)O/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 (similar to 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.
2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4867835
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