(401aq) Composite Ionic Liquid and Dense Polymeric Membranes for CO2/N2 and CO2/CH4 Gas Separation at Elevated Pressures
AIChE Annual Meeting
2017 Annual Meeting
Poster Session: Separations Division
Tuesday, October 31, 2017 - 3:15pm to 4:45pm
CO2/N2 separation results obtained from both systems showed that the addition of [C4mim][NTf2], [DIP-C4mim][NTf2], and [N4441][formate] to PSF increased the separation efficiency of CO2. However, CO2/N2 selectivity decreased with the addition of [P4441][formate]. The optimum IL concentrations for CO2/N2 separation are 0.5 wt% [C4mim][NTf2] and [DIP- C4mim][NTf2], 50 wt% for [P4441][formate], and 25 wt% for [N4441][formate].
On the other hand, all of the used ILs showed increased CO2/CH4 selectivity compared to that of pure PSF. The highest CO2/CH4 selectivities were obtained with DPSILMs having low IL concentrations hence the optimum IL concentrations are 2.5 wt% for [C4mim][NTf2] and [DIP- C4mim][NTf2], 5 wt% for [P4441][formate], and 0.5 wt% for [N4441][formate].
Stability measurements on DPSILMs were conducted with regards to IL loss. DPSILMs incorporated [N4441][formate] and [P4441][formate] exhibited small loss of IL compared to that reported in literature. Conversely, no loss of [C4mim][NTf2] and [DIP- C4mim][NTf2] was observed. Thus, the synthesized DPSILMs are stable at high pressures for long durations.