TY - JOUR
T1 - Thermophysical properties and CO2 absorption of ammonium-based protic ionic liquids containing acetate and butyrate anions
AU - Yunus, Normawati M.
AU - Halim, Nur Hamizah
AU - Wilfred, Cecilia Devi
AU - Murugesan, Thanabalan
AU - Lim, Jun Wei
AU - Show, Pau Loke
N1 - Funding Information:
Acknowledgments: Financial assistance and support from Universiti Teknologi PETRONAS and Center of Research in Ionic Liquids (CORIL), UTP are greatly acknowledged.
Funding Information:
Funding: This research was funded by the Ministry of Higher Education (MOHE), Government of Malaysia, under the Fundamental Research Grant Scheme, [FRGS No: FRGS/1/2016/STG01/UTP/03/1] entitled The impact of cations and anions structures of ionic liquids on the CO2 absorption from natural gas and also YUTP grant (cost centre 015LC0-054).
Publisher Copyright:
© 2019 by the authors.
PY - 2019/11/1
Y1 - 2019/11/1
N2 - Ionic liquids, which are classified as new solvents, have been identified to be potential solvents in the application of CO2 capture. In this work, six ammonium-based protic ionic liquids, containing ethanolammonium [EtOHA], tributylammonium [TBA], bis(2-ethylhexyl)ammonium [BEHA] cations, and acetate [AC] and butyrate [BA] anions, were synthesized and characterized. The thermophysical properties of the ammonium-based protic ionic liquids were measured. Density, ρ, and dynamic viscosity, η, were determined at temperatures between 293.15 K and 363.15 K. The density and viscosity values were correlated using empirical correlations and the thermal coefficient expansion, αp, and molecular volume, Vm, were estimated using density values. The thermal stability of the ammonium-based protic ionic liquids was investigated using thermogravimetric analyzer (TGA) at a heating rate of 10 °C·min-1 The CO2 absorption of the ammonium-based ionic liquids were measured up to 20 bar at 298.15 K. From the experimental results, [BEHA][BA] had the highest affinity towards CO2 with the mol fraction of CO2 absorbed approaching 0.5 at 20 bar. Generally, ionic liquids with butyrate anions have better CO2 absorption than that of acetate anions while [BEHA] ionic liquids have higher affinity towards CO2 followed by [TBA] and [EtOHA] ionic liquids.
AB - Ionic liquids, which are classified as new solvents, have been identified to be potential solvents in the application of CO2 capture. In this work, six ammonium-based protic ionic liquids, containing ethanolammonium [EtOHA], tributylammonium [TBA], bis(2-ethylhexyl)ammonium [BEHA] cations, and acetate [AC] and butyrate [BA] anions, were synthesized and characterized. The thermophysical properties of the ammonium-based protic ionic liquids were measured. Density, ρ, and dynamic viscosity, η, were determined at temperatures between 293.15 K and 363.15 K. The density and viscosity values were correlated using empirical correlations and the thermal coefficient expansion, αp, and molecular volume, Vm, were estimated using density values. The thermal stability of the ammonium-based protic ionic liquids was investigated using thermogravimetric analyzer (TGA) at a heating rate of 10 °C·min-1 The CO2 absorption of the ammonium-based ionic liquids were measured up to 20 bar at 298.15 K. From the experimental results, [BEHA][BA] had the highest affinity towards CO2 with the mol fraction of CO2 absorbed approaching 0.5 at 20 bar. Generally, ionic liquids with butyrate anions have better CO2 absorption than that of acetate anions while [BEHA] ionic liquids have higher affinity towards CO2 followed by [TBA] and [EtOHA] ionic liquids.
KW - Ammonium-based protic ionic liquids
KW - CO absorption
KW - Density
KW - Thermal expansion coefficient
KW - Thermal stability
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=85075547563&partnerID=8YFLogxK
U2 - 10.3390/pr7110820
DO - 10.3390/pr7110820
M3 - Article
AN - SCOPUS:85075547563
SN - 2227-9717
VL - 7
JO - Processes
JF - Processes
IS - 11
M1 - 820
ER -