ABSTRACT Membrane comparison and selection for effective gas separation is an important aspect of industrial operations. Numerous gas membrane‐based studies, however, consist of unreported parameters which are critical to the selection process. As a result, membranes are often compared based on very limited performance properties, majorly permeability and selectivity. Thus, using CO 2 separation from H 2 –CO 2 mixture as a case study, this work investigated the impact of three new performance properties on membrane comparison and ranking; these properties are: degradation temperature ( T d ), permeability reduction with pressure (∆ P CO2 /∆Pr), and selectivity reduction with pressure (∆ α CO2/H2 /∆Pr). Consequently, the best membranes for H 2 –CO 2 separation were determined from 16 samples sourced from literature. The multiobjective optimization (MOO) approach which is based on weight allocation to membrane properties for performance indices (PIs) calculation has been employed in the study. The result shows that the newly introduced properties led to entirely new membrane PIs and rankings compared to only permeability and selectivity. Additionally, the high‐valence metal‐induced microporous polymer‐polyvinyl amine/modified‐polysulfone (HMMP‐1‐PVAm/mPSf) membrane exhibited the highest PI based on the selection criteria and is the most suitable out of all the investigated membranes. All in all, this study shows the importance of other critical membrane properties in addition to permeability and selectivity. The inclusion of these properties in literature studies and their use as comparison criteria will allow a better selection of the most effective membranes for industrial operations.
Mujeeb Babatunde Adetayo (Sun,) studied this question.