CO₂ stripping from ionic liquid at elevated pressures in gas-liquid membrane contactor

CO₂ stripping from ionic liquid at elevated pressures in gas-liquid membrane contactor

Bazhenov, Stepan (Russian Academy of Sciences)
Malakhov, Alexander (Russian Academy of Sciences)
Bakhtin, Danila (Russian Academy of Sciences)
Khotimskiy, Valery (Russian Academy of Sciences)
Bondarenko, Galina (Russian Academy of Sciences)
Volkov, Vladimir (Russian Academy of Sciences)
Ramdin, M. (TU Delft Engineering Thermodynamics)
Vlugt, T.J.H. (TU Delft Engineering Thermodynamics)
Volkov, Alexey (Russian Academy of Sciences)

2018

In this study, the gas-liquid membrane contactor was considered for regeneration of the room-temperature ionic liquids (RTIL) that can be used as physical solvents for carbon dioxide capture process at elevated pressures. Poly[1-(trimethylsilyl)-1-propyne] (PTMSP) was selected as a membrane material due to its high mass transport characteristics and good mechanical properties. Nine different RTILs, such as [Emim][DCA], [Emim][BF₄], [Emim][DEP], [Bmim][BF₄], [Bmim][Tf₂N], [Hmim][TCB], [P66614][DCA], [P66614][Br] and [P66614][Phos], were used to evaluate the solvent-membrane compatibility. The long-term sorption tests (40+ days) revealed that the solvent-membrane interaction is mainly determined by the liquid surface tension regardless of viscosity and molecular size of RTILs. For instance, [Emim][BF₄] and [Emim][DCA], having the surface tension of 60.3 and 54.0 mN/m, demonstrated a very low affinity to the bulk material of PTMSP (sorption as low as 0.02 g/g; no swelling); while for the next ionic liquid [Bmim][BF₄] with surface tension of 44.4 mN/m, the sorption and swelling of PTMSP was 0.79 g/g and 21%, respectively. The long-term RTIL permeation test (Δp = 40 bar, T = 50°С t > 400 h) confirmed that there is no hydrodynamic flow through PTMSP for [Emim][DCA] and [Emim][BF₄]. The concept of CO₂ stripping from RTIL with the membrane contactor by the pressure (Δp = 10 bar) and temperature (ΔT = 20 °С) swing was proved by using dense PTMSP membrane and [Emim][BF₄]. The overall mass transfer coefficient value was equal to (1.6 − 3.8) × 10⁻³ cm/s with respect to liquid flow rate. By using the resistance-in-series model, it was shown that the membrane resistance contribution to the gas transfer was estimated to be approximately 8%.

Carbon dioxide
Membrane contactor
PTMSP
Room-temperature ionic liquid
Stripping

http://resolver.tudelft.nl/uuid:e432f89d-3288-47b4-a250-3f04c276d25d

https://doi.org/10.1016/j.ijggc.2018.03.001

2020-03-19

1750-5836

International Journal of Greenhouse Gas Control, 71, 293-302

Accepted Author Manuscript

Institutional Repository

journal article

© 2018 Stepan Bazhenov, Alexander Malakhov, Danila Bakhtin, Valery Khotimskiy, Galina Bondarenko, Vladimir Volkov, M. Ramdin, T.J.H. Vlugt, Alexey Volkov