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

被引:30
|
作者
Bazhenov, Stepan [1 ]
Malakhov, Alexander [1 ]
Bakhtin, Danila [1 ]
Khotimskiy, Valery [1 ]
Bondarenko, Galina [1 ]
Volkov, Vladimir [1 ]
Ramdin, Mahinder [2 ]
Vlugt, Thijs J. H. [2 ]
Volkov, Alexey [1 ]
机构
[1] AV Topchiev Inst Petrochem Synth RAS, Leninsky Prospect 29, Moscow 119991, Russia
[2] Delft Univ Technol, Proc & Energy Dept, Leeghwaterstr 39, NL-2628 CB Delft, Netherlands
关键词
Membrane contactor; Room-temperature ionic liquid; PTMSP; Carbon dioxide; Stripping; CARBON-DIOXIDE CAPTURE; OF-THE-ART; ABSORPTION PROCESS; REGENERATION; SOLUBILITY; MONOETHANOLAMINE; POLYMER; PERMEABILITY; SELECTIVITY; PERMEATION;
D O I
10.1016/j.ijggc.2018.03.001
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 (Delta p=40 bar, T=50 degrees C, 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 (Delta p=10 bar) and temperature (Delta T=20 degrees C) swing was proved by using dense PTMSP membrane and [Emim] [BF4]. The overall mass transfer coefficient value was equal to (1.6-3.8) x10(-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%.
引用
收藏
页码:293 / 302
页数:10
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