TY - JOUR
T1 - Volumetric and phase behaviour of mixtures of tetracyanoborate-based ionic liquids with high pressure carbon dioxide
AU - Zakrzewska, Małgorzata E.
AU - Nunes da Ponte, Manuel
N1 - This work was supported by Fundacao para a Ciencia e a Tecnologia-FCT (Portugal) through the project UID/QUI/50006/2013. M.E. Zakrzewska is thankful to FCT for her doctoral fellowship SFRH/BD/749292010.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - The high-pressure solubility of carbon dioxide in ionic liquids based on tetracyanoborate anion, 1-ethyl-3-methylimidazolium tetracyanoborate ([emim][B(CN)4]) and 1-hexyl-3-methylimidazolium tetracyanoborate ([hmim][B(CN)4]), was determined experimentally at the temperature of 313.15 K and pressures up to 19 MPa. Additionally, measurements of volume expansion of a liquid phase, based on a change in total or molar volume of a liquid upon carbon dioxide addition, are reported. The obtained results show that CO2 has a high solubility in tetracyanoborate-based ionic liquids, comparable, or even slightly higher, to the CO2 solubility in fluorinated CO2-philic ionic liquids. Approximately 60% CO2-induced volume expansion of the liquid was observed at the highest pressures, an unprecedented result for ionic liquid+ CO2 systems.
AB - The high-pressure solubility of carbon dioxide in ionic liquids based on tetracyanoborate anion, 1-ethyl-3-methylimidazolium tetracyanoborate ([emim][B(CN)4]) and 1-hexyl-3-methylimidazolium tetracyanoborate ([hmim][B(CN)4]), was determined experimentally at the temperature of 313.15 K and pressures up to 19 MPa. Additionally, measurements of volume expansion of a liquid phase, based on a change in total or molar volume of a liquid upon carbon dioxide addition, are reported. The obtained results show that CO2 has a high solubility in tetracyanoborate-based ionic liquids, comparable, or even slightly higher, to the CO2 solubility in fluorinated CO2-philic ionic liquids. Approximately 60% CO2-induced volume expansion of the liquid was observed at the highest pressures, an unprecedented result for ionic liquid+ CO2 systems.
KW - Carbon dioxide
KW - High-pressure solubility
KW - Ionic liquid
KW - Tetracyanoborate anion
KW - Volume expansion
UR - http://www.scopus.com/inward/record.url?scp=84961199725&partnerID=8YFLogxK
U2 - 10.1016/j.supflu.2016.03.011
DO - 10.1016/j.supflu.2016.03.011
M3 - Article
AN - SCOPUS:84961199725
SN - 0896-8446
VL - 113
SP - 31
EP - 38
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
ER -