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Comparison of the phase behavior of some selected binary systems with ionic liquids
Author(s) -
Shariati Alireza,
Gutkowski Karin,
Peters Cor J.
Publication year - 2005
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10384
Subject(s) - ionic liquid , supercritical fluid , hexafluorophosphate , chemistry , thermodynamics , critical point (mathematics) , binary number , phase (matter) , dipole , binary system , supercritical carbon dioxide , vapor pressure , analytical chemistry (journal) , chromatography , organic chemistry , physics , arithmetic , mathematical analysis , mathematics , catalysis
The phase behavior of binary mixtures consisting of two different supercritical fluids, one with no dipole moment and the other one with a strong dipole moment, and an imidazolium‐based ionic liquid were studied experimentally. Carbon dioxide (CO 2 ) and trifluoromethane (CHF 3 ), and 1‐butyl‐3‐methylimidazolium hexafluorophosphate ([bmim][PF 6 ]) were the selected supercritical fluids and ionic liquid, respectively. A synthetic method was used to measure liquid–vapor (LV) and liquid–liquid–vapor (LLV) boundaries of these binary systems. Results for the LV boundaries are reported for CO 2 concentrations ranging from 10.0 to 65.0 mol % and within temperature and pressure ranges of 293.29–363.54 K and 0.59–73.50 MPa, and for CHF 3 concentrations ranging from 10.2 to 99.0 mol % and within temperature and pressure ranges of 303.20–363.42 K and 0.58–41.00 MPa, respectively. The LV boundaries of pure CO 2 and CHF 3 were measured up to their critical points. For the binary systems consisting of either CO 2 or CHF 3 with [bmim][PF 6 ], the LLV boundaries were similarly measured up to their critical endpoints. The experimental results obtained in this work show that the binary systems of CO 2 or CHF 3 + [bmim][PF 6 ] have Type III phase behavior according to the classification of Scott and Van Konynenburg. To the extent available, the experimental data obtained for the system CO 2 + [bmim][PF 6 ] were compared with literature data. In addition, comparisons were made with literature data of binary systems of either CO 2 or CHF 3 with other ionic liquids belonging to the same homologous family. © 2005 American Institute of Chemical Engineers AIChE J, 2005