Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - High-pressure solubilities of carbon dioxide in ionic liquids based on bis(trifluoromethylsulfonyl)imide and chloride
AU - Manic, Marina S.
AU - Queimada, Antonio J.
AU - Macedo, Eugenia A.
AU - Najdanovic, Vesna
PY - 2012/5
Y1 - 2012/5
N2 - In this work, the solubility of carbon dioxide (CO2) in seven different ionic liquids (ILs) was measured using a high-pressure sapphire cell, in the pressure range of 8-22 MPa and at two temperatures, 313.2 K and 323.2 K. In order to discuss the influence of the cation, ILs based on bis(trifluoromethylsulfonyl)imide. [NTf2] were chosen. They were coupled with 1-butyl-3-methylimidazolium, [C(4)mim](+), 1-decyl-3-methylimidazolium, [C(10)mim](+), 1-butyl-methylpyrrolidinium, [Pyrr(4,1)](+), butyltrimethylammonium, [N-4,N-1,N-1,N-1](+), methyltrioctylammonium, [N-1,N-8,N-8,N-8](+) and trihexyltetradecylphosphonium, [P-6,P-6,P-6,P-14](+)cation. The phosphonium based cation was also combined with chloride, [Cl](-), giving an opportunity to discuss the influence of an anion as well. The solubility data obtained in this work were used to evaluate the importance of explicitly including association for describing such systems. For that purpose, we compared the solubility modelling results from two cubic equations of state (Peng-Robinson and Soave-Redlich-Kwong) with those from the Cubic Plus Association Equation of State (CPA EoS) using different association schemes for the ionic liquids. We found that for such systems there is no major advantage in considering ILs as associating components. (c) 2012 Elsevier B.V. All rights reserved.
AB - In this work, the solubility of carbon dioxide (CO2) in seven different ionic liquids (ILs) was measured using a high-pressure sapphire cell, in the pressure range of 8-22 MPa and at two temperatures, 313.2 K and 323.2 K. In order to discuss the influence of the cation, ILs based on bis(trifluoromethylsulfonyl)imide. [NTf2] were chosen. They were coupled with 1-butyl-3-methylimidazolium, [C(4)mim](+), 1-decyl-3-methylimidazolium, [C(10)mim](+), 1-butyl-methylpyrrolidinium, [Pyrr(4,1)](+), butyltrimethylammonium, [N-4,N-1,N-1,N-1](+), methyltrioctylammonium, [N-1,N-8,N-8,N-8](+) and trihexyltetradecylphosphonium, [P-6,P-6,P-6,P-14](+)cation. The phosphonium based cation was also combined with chloride, [Cl](-), giving an opportunity to discuss the influence of an anion as well. The solubility data obtained in this work were used to evaluate the importance of explicitly including association for describing such systems. For that purpose, we compared the solubility modelling results from two cubic equations of state (Peng-Robinson and Soave-Redlich-Kwong) with those from the Cubic Plus Association Equation of State (CPA EoS) using different association schemes for the ionic liquids. We found that for such systems there is no major advantage in considering ILs as associating components. (c) 2012 Elsevier B.V. All rights reserved.
KW - Solubility
KW - IL-CO2
KW - SRK EoS
KW - Supercritical
KW - CPA EoS
KW - SURFACE-TENSION
KW - VAPOR-PRESSURE
KW - PR EoS
KW - CPA EOS
KW - PHASE-BEHAVIOR
KW - High-pressure
KW - MELTING-POINT DEPRESSION
KW - GAS SOLUBILITY
KW - VOLUMETRIC PROPERTIES
KW - 1-BUTYL-3-METHYLIMIDAZOLIUM BIS(TRIFLUOROMETHYLSULFONYL)IMIDE
KW - THERMODYNAMIC PROPERTIES
KW - SUPERCRITICAL FLUIDS
U2 - 10.1016/j.supflu.2012.02.016
DO - 10.1016/j.supflu.2012.02.016
M3 - Journal article
VL - 65
SP - 1
EP - 10
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
SN - 0896-8446
ER -