Experimental densities for the system (A): Water (1) + 1-Pentanol (2), system (B): Water (1) + 2-Pentanol (2) and system (C): Water (1) + 1-Pentanol (2) + 2-Pentanol (3), are reported from 313 to 363K and up to 25MPa. Densities were measured for binary and ternary mixtures at five different compositions for the three systems.

The measure of densities was made with a experimental system equipped with a vibrating tube densimeter (VTD) Anton Paar DMA 60/512P witch can operate up to 70 MPa and 150 °C. This equipment is connected to a sapphire cell; to feed the VTD, and to pressurize the mixture.

Densities of 1-pentanol and 2-pentanol were correlated by two different models, the Benedict–Webb–Rubin–Starling [1] equation of state (BWRS EoS), and a equation proposed by Zuñiga-Moreno [2]. These models represent densities of 1-pentanol and 2-pentanol with a percent standard deviation of 9.0×10-3 and 1.5×10-3, respectively

The excess molar volumes were determined using densities for water, 1-pentanol and 2-pentanol. In the analysis of the densities obtained, we observed that the mixtures are more sensible to the change of temperature than pressure. Beside we observed similar tendency of excess molar volume in the three mixtures, even in each composition.

Keywords: Density; Alkanols; Water; Excess volumes

References:

[1] K.E. Starling, Hydrocarb. Process. 50 (1971) 101–104.

[2]A. Zuñiga-Moreno, L. A. Galicia-Luna, F. F. Betancourt-Cardenas. Fluid Phase Equilibria. 236 (2005) 133-204.