title: Solubility of tetrafluoromethane in the ionic liquid [hmim][Tf2N].
abstract: Experimental results for the solubility of tetrafluoromethane (CF4, R14) in the ionic liquid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([hmim][Tf2N]) are presented for temperatures between 293.3 and 413.3 K, at pressures (gas molalities) up to 9.6 MPa (0.22 mol kg-1). The experimental results were determined with a high-pressure view-cell technique operating on the synthetic method. The experimental data were used to determine Henry's constant of tetrafluoromethane in [hmim][Tf2N]. The results for the Henry's constant (at zero pressure) are correlated (on the molality scale) within the experimental uncertainty (i.e., about 1.1%) by ln(k(0)(H,CF4)/MPa) = 7.537 - 893.8/(T/K) - 0.003977(T/K). Henry's law was also extended to describe the gas solubility at higher pressures. Furthermore, a cubic equation of state was used to correlate the gas solubility over the entire range of experimentally investigated temperature and pressure. Both methods proved suited for a reliable correlation of the new experimental data.
authors.affiliation: Applied Thermodynamics, University of Kaiserslautern, Kaiserslautern, Germany.
authors.forename: Jacek
authors.initials: J
authors.lastname: Kumełan
authors.forename: Alvaro Pérez-Salado
authors.initials: AP
authors.lastname: Kamps
authors.forename: Dirk
authors.initials: D
authors.lastname: Tuma
authors.forename: Akimichi
authors.initials: A
authors.lastname: Yokozeki
authors.forename: Mark B
authors.initials: MB
authors.lastname: Shiflett
authors.forename: Gerd
authors.initials: G
authors.lastname: Maurer
mesh_terms: D052578:Ionic Liquids / Q000737:chemistry*; D012995:Solubility; D013696:Temperature
chemical_list: D052578:Ionic Liquids