Critical constants and acentric factors for long-chain alkanes suitable for corresponding states applications. A critical review

摘要

Several methods for the estimation of the critical temperature T_c, the critical pressure P_c, and the acentric factor ω for long-chain n-alkanes are reviewed and evaluated for the prediction of vapor pressures using Corresponding states (CS) methods, like the Lee-Kesler equation and the cubic equations of state. Most reliable and recent literature methods proposed for the estimation of the acentric factor of heavy alkanes yield similar values and the emphasis is, thus, given to the determination of the best sets of T_c and P_c. Various extrapolation schemes proposed for this purpose and several general group-contribution methods were investigated in this work.