Thermodynamic efficiency of membrane separation of dilute gas: Estimation for CO2 direct air capture application

IF 4.9 Q1 ENGINEERING, CHEMICAL
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Abstract

Gas separation technology is crucial for addressing environmental issues like CO2 capture to mitigate climate change. While membrane separation is often cited for its efficiency, accurate estimations are scarce. We present estimations based on classical thermodynamics for very lean CO2 composition (400 ppm), revealing rich details in simple systems and deriving guiding principles. Our main conclusion emphasizes the critical necessity of a high membrane separation ratio, and we discuss candidates for achieving this goal.

Abstract Image

稀释气体膜分离的热力学效率:二氧化碳直接空气捕获应用估算
气体分离技术对于解决二氧化碳捕集等环境问题以缓解气候变化至关重要。虽然膜分离的效率经常被提及,但准确的估算却很少。我们以经典热力学为基础,对非常贫乏的二氧化碳成分(400 ppm)进行了估算,揭示了简单系统中的丰富细节,并得出了指导原则。我们的主要结论强调了高膜分离率的关键必要性,并讨论了实现这一目标的候选方案。
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