Journal
RSC ADVANCES
Volume 6, Issue 17, Pages 14149-14163Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/C5RA27772H
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Funding
- National Iranian Gas Company (NIGC)
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One of the common polyimides, P84 HT (BTDA-TDI/MDI), was used to synthesize gas separating carbon molecular sieve (CMS) membranes and study their gas transport properties. This study explores the role of key variables such as blend composition and the pyrolysis conditions in synthesizing CMS membranes as well as the operating temperature and pressure on gas transport performance through modeling and optimization methods. An experimental design conducted through the implementation of D-optimal design took into account four main parameters to optimize gas permeability and ideal gas pair selectivity. The highest selectivity can be obtained from precursors carbonized at a higher temperature, but optimal values for both the selectivity and permeability were attained for those CMS membranes pyrolyzed at 760.2 degrees C. The optimum operating conditions for this membrane are 4.5 bar and 25 degrees C. Under these conditions, the selectivities of N-2/CH4, CO2/CH4, O-2/N-2 and N-2/CO2, were 3.65, 155.7, 28.4 and 49.6, respectively.
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