ABSTRACT

Isothermal (vapour + liquid) equilibrium (VLE) data for the binary systems (carbon dioxide + cyclopentane) and (carbon dioxide + cyclohexane) were determined using a (static + analytical) method with phases sampling by rapid online sample injectors (ROLSI) coupled to a gas chromatograph (GC) for analysis. The VLE behaviour for these systems was also analysed based on the PR and RKPR equations of state (EoS) and different available data from the literature, both critical and subcritical. It is clearly shown how CO2 is more soluble and miscible with normal alkanes than with the corresponding cycloalkanes. Predictions based on the general correlation of available data in wide ranges of conditions suggest the appearance of double retrograde behaviour at least for (CO2 + cyclohexane) mixtures with very low contents of the hydrocarbon in CO2, being this phenomenon very much related to asymmetry of the system. The existence of this phenomenon has not been experimentally confirmed yet for these systems and should be explored.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	C5H10	cyclopentane
3	C6H12	cyclohexane

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1 2	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	37
POMD	1 2	Mole fraction - 1 ; Gas	Mole fraction - 1; Liquid Temperature, K; Liquid	Gas Liquid	Chromatography	37
POMD	1 2	Critical pressure, kPa ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Direct measurement	8
POMD	1 2	Critical temperature, K ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Visual observation in an unstirred cell	8
POMD	3 1	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	19
POMD	3 1	Mole fraction - 1 ; Gas	Mole fraction - 1; Liquid Temperature, K; Liquid	Gas Liquid	Chromatography	19

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

The effect of the naphthenic ring on the VLE of (carbon dioxide + alkane) mixtures

Sima, S.[Sergiu], Milanesio, J. M.[Juan Manuel], Ramello, J. I.[Juan Ignacio], Cismondi, M.[Martin], Secuianu, C.[Catinca], Feroiu, V.[Viorel], Geana, D.[Dan]

ABSTRACT