Reducing the energy requirement is the primary challenge for post-combustion CO₂ capture technologies. Growing interest is being shown in membrane processes as an alternative to the reference technologies (such as gas-liquid absorption in amine absorption). However, these membrane processes remain energy intensive when the recommended CO₂ purity and capture ratio (both typically at 90%) are imposed. In this study, a systematic parametric analysis of the energy requirement of a single stage membrane gas separation module has been performed. Different inlet CO₂ contents and membrane selectivity performances have been compared. In contrast to previous studies, the capture ratio and CO₂ purity constraints have been relaxed below the 90% target in order to possibly identify the most appropriate role and place of membrane processes in a Carbon Capture and Storage (CCS) framework. It is shown that diluted CO₂ feed streams (such as natural gas turbine flue gases) systematically require excessive energy for CO₂ capture. However, single stage membrane units offer interesting possibilities with a very low energy requirement when used as a pre-concentration step for a moderate inlet CO₂ content (15-30%) or as a final step for concentrated streams (50% inlet CO₂ content or more). Finally, guidelines for improved integration strategies of membrane units in different carbon capture scenarios, with a particular emphasis on hybrid processes, are proposed.

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{{Explor lien
   |wiki=    Wicri/Lorraine
   |area=    LrgpV1
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     Pascal:13-0046174
   |texte=   Membrane gas separations and post-combustion carbon dioxide capture: Parametric sensitivity and process integration strategies
}}