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The best alternative for green propylene production was determined via an analytic hierarchy process considering technical, economic, and environmental aspects simultaneously with different weighted values of each criterion under uncertainty.

As the global trend towards transition to a "hydrogen society" continues to gain momentum, a lot of studies on alternative hydrogen (H 2 ) production methods are on the rise. Among them, methylcyclohexane (MCH) dehydrogenation in a membrane reactor (MR) is reported here as one possible candidate, affording its enhanced H 2 yield and a compact design. In this study, techno-economic analysis and carbon footprint analysis (CFA) of MCH dehydrogenation in an MR are carried out to investigate economic and environmental feasibility providing techno-economic and environmental guidelines for realizing it as mature technology. The economic parameters are determined through process simulation using Aspen Plus®, and the unit H 2 production costs are obtained for a packed-bed reactor (PBR) and an MR in H 2 production capacities of 30, 100, 300, and 700 m 3 h − 1 . The effects of each economic parameter on the unit H 2 production cost are identified through sensitivity analysis (SA) and scenario analysis is performed under various conditions to investigate the effects of technical parameters of the membrane, such as the H 2 production capacity, temperature, and H 2 permeance on the unit H 2 production costs. CFA is also performed to investigate the environmental feasibility of MCH dehydrogenation in an MR by considering CO 2 emissions at each part.

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