Improved correlations for heavy n-paraffin physical properties

Direct perturbation of the Peng–Robinson attraction and covolume parameters for reservoir fluid characterization

“…The differences from physical critical parameters estimated by Constantinou and Gani (1994) were discussed in the Supporting information (Part 1). In general, the optimized critical parameters tend to be higher than estimated physical values for n-alkanes; e.g., the sets of critical parameters from Constantinou and Gani (1994) and Gao et al (2001). The higher critical parameters result in extended two-phase lines in P-T space for pure components.…”

“…The higher critical parameters result in extended two-phase lines in P-T space for pure components. To show the effect of the higher critical parameters on phase behavior predictions in composition space, Kumar and Okuno (2012) compared bubble-and dew-point predictions for n-alkane binaries by using two sets of critical parameters; i.e., the optimized parameters from Kumar and Okuno (2012) and the estimated physical parameters from Gao et al (2001). BIPs were set to zero for systematic comparisons.…”

Comparison of the prediction power of 23 generalized equations of state: Part II — Parametric evaluation

“…In the following subsections, it is intended to examine the parameters of EOSs in each group for anomalies caused by the particular conditions of the variables used to define them, namely the characteristic properties of substances and the reduced temperature. One of the mentioned characteristic properties is the acentric factor ω whose value in practice varies in the range of −0.365 to 1.1672 for pure substances while the lower and upper limits of this range belong to helium [49] and octacosane [50], respectively. Another characteristic property is the critical compressibility factor Z c whose value for pure substances varies in the range of 0.117-0.428 while the lower and upper limits of this range belong to hydrogen fluoride [49] and hydrazine [51], respectively.…”

UNIQUAC model for wax solution with pour point depressant

“…The critical properties and acentric factor required in the evaluation of equation of state parameters are obtained from the Gasem's correlations [21].…”