Volumetric Properties for the Binary Systems Hexane plus Octane and Hexane plus Decane at High Temperatures and Pressures

Volumetric properties (p, rho, T, x(1)) of two binary linear alkane systems are reported in the temperature range of (313 to 363) K and up to 25 MPa. Binary mixtures were prepared at compositions of (x(1)= 0.1654, 0.2199, 0.5749, 0.7995, and 0.9308) for hexane (1) + octane (2) and hexane (1) + decane (2) at (x(1) = 0.0456, 0.2185, 0.4968, 0.7524, and 0.8991) in mole fraction. Experimental densities were measured in a vibrating-tube densimeter, DMA HPM from Anton Paar, using water and nitrogen as reference fluids. The excess molar volumes, isobaric thermal expansivities, and isothermal compressibilities for these systems were computed from experimental data using a six-parameter modified Toscani and Szwarc equation.