THERMOPHYSICAL PROPERTIES OF NORMAL-ALKANES FROM C1 TO C20 AND THEIR PREDICTION FOR HIGHER ONES

Reliable values for the thermophysical properties: critical properties, acentric factors, vapor pressures (PS), saturated liquid volumes (VS1) and enthalpies of vaporization (ΔHv) for the C1 to C20 n-Alkanes are presented. The PS, VS1 and ΔHv values are successfully predicted with a translated form of the van der Waals (t-vdW) and of the Peng-Robinson (t-PR) equation of state (EoS) presented here. The two t-EoS give also reasonable predictions of vapor pressures, saturated liquid volumes and enthalpies of vaporization for n-Alkanes higher than C20 using extrapolated Tc, Pc, and ω values presented here. The t-vdW and t-PR predict, for example, the recent accurate PS data for C28 with average absolute error of 2.7% and 3.6% respectively. © 1990.