Biogas requires specific processing in terms of upgradation to remove acid gas contents, making it a profitable fuel with higher energy content. This is conventionally attained through physical or chemical absorption due to the higher selectivity towards CO₂ and H₂S. The conventional processing technology impacts the process with higher energy content for solvent regeneration, solvent loss causing a threat to the environment with its toxicity, and damaging the equipment by corrosion. In this view, ionic liquids (ILs) emerged as potential candidates providing a favorable facet in terms of both processing and ecological aspects. Hence, herein the potential of IL and deep eutectic solvent (DES) in comparison to the conventional solvents and technologies used for biogas upgrading based on process system engineering perspective that showcases techno-economic, energy-economic, and environmental aspects and opportunities that may lead towards establishing sustainable and effective processing of biogas is shown and a comprehensive review on the opportunities, prospects, and challenges to make IL and DES as future solvent for biogas upgrading on the commercial scale is provided.

中文翻译：

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基于过程系统工程视角的离子液体作为沼气提质技术合适溶剂的评价

沼气需要在升级方面进行特定处理以去除酸性气体，使其成为具有更高能量含量的有利可图的燃料。_{由于对 CO 2}和 H ₂的选择性更高，这通常通过物理或化学吸收来实现S. 传统的加工技术对工艺的影响较大，溶剂再生的能量含量较高，溶剂的损失会因其毒性而对环境造成威胁，还会因腐蚀而损坏设备。在这种观点下，离子液体 (ILs) 成为潜在的候选者，在加工和生态方面都提供了有利的方面。因此，在此，IL 和深共熔溶剂 (DES) 与用于沼气升级的传统溶剂和技术相比的潜力，基于工艺系统工程的观点，展示了技术经济、能源经济和环境方面以及可能导致的机会展示了建立可持续和有效沼气处理的方向，并对机遇、前景、