Abstract: Vapor-liquid equilibrium data of supercritical carbon dioxide+n-hexane system were measured at 313 K, 333 K, 353 K and 373 K in the pressure range of 2.15—12.63 MPa.The measurements were carried out in a cylindrical autoclave with a movable piston.It was shown that the density of the gas phase increased with increasing pressure at the given temperature, but the density of the liquid phase decreased.The high pressure data were calculated with the Franck equation.The results were in agreement with experimental data.Furthermore,the semi-empirical equation of Chrastil was used to correlate the solubility of n-hexane in supercritical carbon dioxide,and the parameters in the equation were obtained.