P rho T measurements of imidazolium-based ionic liquids

authors	Gardas, RL; Freire, MG; Carvalho, PJ; Marrucho, IM; Fonseca, IMA; Ferreira, AGM; Coutinho, JAP
nationality	International
journal	JOURNAL OF CHEMICAL AND ENGINEERING DATA
keywords	EXTENDED PRESSURE RANGE; PHASE-BEHAVIOR; PHYSICOCHEMICAL PROPERTIES; THERMODYNAMIC PROPERTIES; PHYSICAL-PROPERTIES; THERMOPHYSICAL PROPERTIES; 1-N-BUTYL-3-METHYLIMIDAZOLIUM HEXAFLUOROPHOSPHATE; CARBON-DIOXIDE; MOLTEN-SALTS; TEMPERATURE
abstract	Experimental density measurements are reported, and the derived thermodynamic properties, such as the isothermal compressibility, the isobaric expansivity, and the thermal pressure coefficient are presented as Supporting Information for several imidazolium-based ionic liquids (ILs), namely, 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [C(2)mim][NTf2], 1-heptyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [C(7)mim][NTf2], 1-octyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [C(8)mim][NTf2], 1-ethyl-3-methylimidazolium tetrafluoroborate [C(2)mim][BF4], and 1-butyl-3-methyl-imidazolium tricyanomethane[C(4)mim][C(CN)(3)] in the pressure (0.10 < p/MPa < 30.00) and temperature (293.15 < T/K < 393.15) domains. These ILs were chosen to provide an understanding of the influence of the cation alkyl chain length and the anion influence on the properties under study. Experimental densities are correlated with the Tait equation with an average absolute deviation (AAD) less than 0.04 %. Experimental densities are in good agreement with the densities obtained by some recent predictive methods proposed in the literature.
publisher	AMER CHEMICAL SOC
issn	0021-9568
year published	2007
volume	52
issue	5
beginning page	1881
ending page	1888
digital object identifier (doi)	10.1021/je700205n
web of science category	Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical
subject category	Thermodynamics; Chemistry; Engineering
unique article identifier	WOS:000249501400060