| Title | An energy-efficient process for enhanced production of bioethanol from sorghum biomass: a futuristic approach towards circular economy |
|---|---|
| ID_Doc | 5589 |
| Authors | Srinivasan, S; Venkatachalam, S |
| Title | An energy-efficient process for enhanced production of bioethanol from sorghum biomass: a futuristic approach towards circular economy |
| Year | 2024 |
| Published | |
| Abstract | Microwave-assisted deep eutectic solvent (DES) pretreatment using choline chloride-formic acid (ChCl: FA) is investigated as a rapid method for lignocellulose fractionation in sorghum biomass for bioethanol production. This study focuses on enhancing cellulose retention and its digestibility while effectively removing the majority of lignin and hemicelluloses. Optimal conditions (ChCl: FA ratio of 1:3, 20 min, 250 W) resulted in 98% cellulose retention and 97% purity, respectively. Furthermore, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to investigate the morphological and crystallinity changes in the biomass following pretreatment. The XRD and SEM characterizations demonstrated that the structural alterations and decreased crystallinity of the pretreated sorghum biomass significantly enhanced cellulose digestibility. Compared to conventional method, this process exhibited a fourfold reduction in energy consumption. The synergetic effect of high cellulose purity and yield led to a maximum ethanol yield of 0.57 g/g cellulose at minimal enzyme dosage (10 FPU) and a short fermentation time (27 h). GC-MS analysis confirms the purity of the obtained bioethanol. The proposed method paves the way for substantial economic benefits in biorefinery, supporting the principles of a circular economy by promoting sustainable and efficient resource utilization. |
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