In this paper experimental data are presented for the binary system propane + phenanthrene. Experimental measurements have been performed for various two-phase and three-phase equilibria, including equilibria in the presence of solid phenanthrene. Based on the course of the various three-phase equilibria, an estimation could be made for the location of the quadruple point solid phenanthrene-liquid-liquid-vapor (SL(1)L(2)G). Experimental work was performed for the temperature range 337 < T/K < 434 and pressures up to 22 MPa. Besides phase equilibrium data also liquid phenanthrene volume measurements are presented for temperatures between (377 and 425) K and pressure varying between (2 and 10) MPa. The experimental phase behavior data were compared to predictions made with the group contribution equation of state, resulting generally in a good agreement.