Transformational Nano-confined Ionic Liquid Membrane for Greater than or Equal to 97 Percent Carbon Dioxide Capture from Natural Gas Combined Cycle Flue Gas
- Gas Technology Institute, Des Plaines, IL (United States)
- State Univ. of New York at Buffalo, NY (United States)
A transformational process based on nano-confined ionic liquid (NCIL) membranes was developed for capturing ≥97% CO2 from natural gas combined cycle (NCCC) flue gas. The NCIL membranes were prepared by loading amino acid ionic liquid into a framework composed of single-walled carbon nanotube mesh filled with graphene oxide quantum dots. The membranes exhibited CO2 permeance as high as 2,000 GPU with a CO2/N2 selectivity of 2,300 for a typical NGCC flue gas composition. When H2O vapor sweep was applied in the permeate side, 96.6% CO2 dry-basis purity and 97.6% CO2 capture rate were achieved for a simulated NGCC flue gas with single stage. In the process design, a highly H2O-selective membrane would be needed to recover majority of the H2O vapor, and the recovered H2O vapor could be recycled to the permeate side of the NCIL membrane. Sulfonated poly(ether ether ketone) membranes were successfully developed for this purpose. These membranes exhibited H2O permeance great than 11,000 GPU and H2O/CO2 selectivity greater than 1,000 at 70ºC for a feed mixture consisting of 14.5 vol% H2O and balanced CO2. A standalone membrane model using MATLAB platform was developed for process simulation. The model was validated with experimental data. Techno-economic analysis based on the testing data collected during the current program suggests this transformational membrane process can achieve 97% CO2 capture efficiency with a cost of $47.8/tonne of CO2, which is a 21% reduction versus DOE’s reference case B31B.97.
- Research Organization:
- Gas Technology Institute, Des Plaines, IL (United States); State Univ. of New York at Buffalo, NY (United States)
- Sponsoring Organization:
- National Energy Technology Laboratory (NETL)
- DOE Contract Number:
- FE0032215
- OSTI ID:
- 2997045
- Report Number(s):
- DOE-GTI--32215-1
- Country of Publication:
- United States
- Language:
- English
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