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This work aims to extend previous studies about performance of gas separation through the carbon molecular sieve membrane (CMSMs) in different conditions by employing statistical analysis and modeling to find the optimal pyrolysis and operating conditions. General D-optimal design is applied to optimize gas permeability and selectivity by implementing five main parameters consisting of “precursor materials”, “blend composition”, “final pyrolysis temperature”, “vacuum pressure” and “operating pressure”. Results from statistical analysis showed that each of these five variables plays a significant role in performance of carbon membranes. Also findings showed that pyrolysis temperature was the dominant factor among the others; whereas operating pressure was almost a neutral one. The optimal condition is the blend composition of 75% Matrimid, pyrolysis temperature at 745.1 °C and vacuum pressure of 1.0E−07 Torr. Under these conditions, the model estimated a CO2/CH4 selectivity of 133.7. These developed models can be employed as a useful technique for gas transport optimization. [ABSTRACT FROM AUTHOR]

This study aims to propose the importance of employing statistical analysis and modeling for investigation on the design and optimization of CMS membranes for gas separation. The factorial methodology is used to optimize permeability and selectivity through implementing the general factorial design considering the three main parameters such as choice of precursor materials, blend composition and the final pyrolysis temperature. Findings by statistical analysis showed that the linear and quadric terms of these three variables had significant effects. The optimal conditions are the Matrimid, blend composition 70%, and pyrolysis temperature at 800°C. Under these conditions, the model estimated a CO2/CH4, H2/CO2, and O2/N2 selectivity of 120.2, 8.39, and 8.06, respectively. Employed statistical technique and developed models can be used as a useful tool for design and optimization of appropriate gas separation membranes with effective performance for various industrial applications. POLYM. ENG. SCI., 54:147-157, 2014. © 2013 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

The original version of this article contains an error in author affiliation. [ABSTRACT FROM AUTHOR]

Highlights: [•] Dianhydride moiety type in polyimide chemical structure plays important role. [•] Higher pyrolysis T enhances membrane selectivity but lowers permeability. [•] Applying higher vacuum degree offer membranes with increased selectivity. [ABSTRACT FROM AUTHOR]