The ideal separation factor for propylene over propane approached 3.2 through the use of room temperature ionic liquids (ILs) such as 1-methyl-3-octyl imidazolium nitrate (MOIM +NO 3 -, 98%) and 1-butyl-3-methyl imidazolium tetrafluoroborate (BMIM +BF 4 -, 98%), which may be attributable to facilitated olefin transport via specific and reversible interactions between ILs and propylene, but not propane. Specific and reversible interactions were verified experimentally from transient sorption/desorption data and FT-IR spectroscopy and theoretically by quantum mechanical calculations. The mixed gas selectivity for propylene/propane mixtures (50/50vol%) was 2.8 through ILs whereas with PEG 400 (Mw=400), which has nearly the same viscosity, the selectivity was only 1.2. This study demonstrated for the first time facilitated olefin transport through ILs.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Membrane Science|
|State||Published - Dec 15 2012|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) for the WCU (World Class University) program ( R31-2008-000-10092 ), the Korea Center for Artificial Photosynthesis (KCAP) located in Sogang University ( NRF-2009-C1AAA001-2009-0093879 ), and the Center for Next Generation Dye-Sensitized Solar Cells (No. 2011-0001055 ), through the National Research Foundation of Korea funded by the Ministry of Education, Science, and Technology .
- Facilitated transport
- Ionic liquid