Enhanced propylene/propane separation by thermal annealing of an intrinsically microporous Hydroxyl-functionalized polyimide membrane
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Type
ArticleKAUST Department
Advanced Membranes and Porous Materials Research CenterChemical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2015-08-06Online Publication Date
2015-08-06Print Publication Date
2015-12Permanent link to this record
http://hdl.handle.net/10754/565818
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Show full item recordAbstract
Effective separation of propylene/propane is vital to the chemical industry where C3H6 is used as feedstock for a variety of important chemicals. The purity requirements are currently met with cryogenic distillation, which is an extremely energy-intensive process. Hybrid arrangements incorporating highly selective membranes (α>20) have been proposed to “debottleneck” the process and potentially improve the economics. Selective and permeable membranes can be obtained by the design of polymers of intrinsic microporosity (PIMs). In this work, a 250 °C annealed polyimide (PIM-6FDA-OH) membrane produced among the highest reported pure-gas C3H6/C3H8 selectivity of 30 for a solution-processable polymer to date. The high selectivity resulted from enhanced diffusivity selectivity due to the formation of inter-chain charge-transfer-complexes. Although there were some inevitable losses in selectivity under 50:50 mixed-gas feed conditions due to competitive sorption, relatively high selectivities were preserved due to enhanced plasticization resistance.Citation
Enhanced propylene/propane separation by thermal annealing of an intrinsically microporous Hydroxyl-functionalized polyimide membrane 2015:JMS151429 Journal of Membrane SciencePublisher
Elsevier BVJournal
Journal of Membrane ScienceAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S0376738815301101ae974a485f413a2113503eed53cd6c53
10.1016/j.memsci.2015.08.015