Journal
AICHE JOURNAL
Volume 60, Issue 11, Pages 3848-3858Publisher
WILEY-BLACKWELL
DOI: 10.1002/aic.14565
Keywords
membrane separations; hollow fibers; Ultem/PIM-1 blends; dual-layer; defect free
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Funding
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program (CRP Award) (NUS) [NRF-CRP 5-2009-5, R-279-000-311-281]
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Dual-layer hollow fiber membranes were produced from blends of Ultem and polymer of intrinsic microporosity (PIM-1) with enhanced gas permeance. The effects of spinning parameters (take-up speed and air gap distance) on gas separation performance were investigated based on the pristine Ultem. Selected spinning conditions were further adopted for the blend system, achieving defect-free and almost defect-free hollow fibers. Adding PIM results in a higher fractional free volume, 50% increments in gas permeance were observed for Ultem/PIM-1 (95/5) and more than 100% increments for Ultem/PIM-1 (85/15). Both O-2/N-2 and CO2/CH4 selectivities remained the same for Ultem/PIM-1 (95/5) and above 80% of their respective intrinsic values for Ultem/PIM-1 (85/15). The selective layer thickness ranges from 70 to 120 nm, indicating the successful formation of ultrathin dense layers. Moreover, minimum amounts of the expensive material were consumed, that is, 0.88, 1.7, and 2.3 wt % PIM-1 for Ultem/PIM-1 (95/5), (90/10), and (85/15), respectively. (C) 2014 American Institute of Chemical Engineers
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