An energy-efficient process for enhanced production of bioethanol from sorghum biomass: a futuristic approach towards circular economy

IF 3.5 4区工程技术 Q3 ENERGY & FUELS Biomass Conversion and Biorefinery Pub Date : 2024-09-04 DOI:10.1007/s13399-024-06083-2

Shobana Srinivasan, Sivakumar Venkatachalam

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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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利用高粱生物质提高生物乙醇生产效率的节能工艺：实现循环经济的未来之路

使用氯化胆碱-甲酸（ChCl：FA）进行微波辅助深共晶溶剂（DES）预处理，是一种快速分馏高粱生物质中木质纤维素以生产生物乙醇的方法。这项研究的重点是提高纤维素的保留率和消化率，同时有效去除大部分木质素和半纤维素。最佳条件（氯化 ChCl：FA 比例为 1:3，20 分钟，250 W）分别使纤维素保留率达到 98%，纯度达到 97%。此外，还采用了 X 射线衍射（XRD）和扫描电子显微镜（SEM）来研究预处理后生物质的形态和结晶度变化。X 射线衍射（XRD）和扫描电子显微镜（SEM）表征表明，预处理后高粱生物质的结构改变和结晶度降低显著提高了纤维素的消化率。与传统方法相比，该工艺的能耗降低了四倍。在高纤维素纯度和产量的协同作用下，以最小的酶用量（10 FPU）和较短的发酵时间（27 小时），乙醇产量最高可达 0.57 克/克纤维素。气相色谱-质谱分析证实了所获生物乙醇的纯度。所提出的方法为生物炼制带来可观的经济效益铺平了道路，通过促进可持续和高效的资源利用，支持了循环经济的原则。

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来源期刊

Biomass Conversion and Biorefinery Energy-Renewable Energy, Sustainability and the Environment

CiteScore

7.00

自引率

15.00%

发文量

1358

期刊介绍： Biomass Conversion and Biorefinery presents articles and information on research, development and applications in thermo-chemical conversion; physico-chemical conversion and bio-chemical conversion, including all necessary steps for the provision and preparation of the biomass as well as all possible downstream processing steps for the environmentally sound and economically viable provision of energy and chemical products.