ABSTRACT

Isoplethic phase diagrams were measured for the system 4'-pentyloxy-4-cyanobiphenyl + CO2 for CO2 mole fractions up to 0.72, in temperature range 280-360 K and at pressures up to 12 MPa using a synthetic method with visual observation. It is found that pure 4'-pentyloxy-4-cyanobiphenyl shows two different solid phases, a nematic liquid phase (N) and an isotropic liquid phase (I2). For the binary system, liquid liquid demixing (I1 + I2) was found. The following phase equilibria were measured: I2 + gas - I2, N + gas - N, solid + N - N, solid + I2 - I2, N - N + I2 and N + I2 - I2. Further, points of the three-phase curves (solid + N + gas), (N + I2 + gas), (solid + N + I2), (solid + I1 + I2) and (I1 + I2 + gas) were determined experimentally. Based on these measurements a P,T-projection of the system was constructed. At 341 K, the molar Henry coefficient of the isotropic phase was determined to be 13.7 MPa.

Compounds

#	Formula	Name
1	C18H19NO	4'-pentoxy-4-cyanobiphenyl
2	CO2	carbon dioxide

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	Solid-liquid equilibrium temperature, K ; Crystal	Pressure, kPa; Crystal	Crystal Nematic liquid crystal	VISOBS	12
POMD	1	Liquid-liquid equilibrium temperature, K ; Nematic liquid crystal	Pressure, kPa; Nematic liquid crystal	Nematic liquid crystal Liquid	VISOBS	13
POMD	2 1	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 2; Liquid Pressure, kPa; Liquid	Liquid Gas	Closed cell (Static) method	71

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Phase behaviour of the system 4'-pentyloxy-4-cyanobiphenyl + CO2

de Groen, M.[Mariette], Matsuda, H.[Hiroyuki], Vlugt, T. J. H.[Thijs J.H.], de Loos, T. W.[Theo W.]

ABSTRACT