General Equation for Correlating the Thermophysical Properties of n-Paraffins, n-Olefins, and Other Homologous Series. 1. Formalism for Developing Asymptotic Behavior Correlations

Abstract

In this first in a series of three papers, a formal treatment is presented for the development of property correlations for homologous series of compounds. The theoretical basis for asymptotic behavior is discussed, and the methodology used to regress parameters is described. The equations developed are quite general and can be extended to other properties or homologous series. Parts 2 and 3 of this series present correlations developed for n-paraffins and n-olefins (1-alkenes) to predict PVT related properties, normal boiling and melting points, critical temperature, pressure, and volume, acentric factor, liquid molar volume, and vapor pressure (part 2); thermal properties, ideal-gas enthalpy and free energy of formation, ideal-gas heat capacity, enthalpy of vaporization, and liquid heat capacity (part 3); transport properties: liquid viscosity, thermal conductivity, and surface tension (part 3). It is demonstrated that these correlations are accurate, consistent, and yield reasonable extrapolations. They are preferable to existing correlations in most instances.

Numerical optimization of a structured tubular reactor for Fischer–Tropsch synthesis

“…Ideal gas law applicable [18] Solubility follows Henry's law [18] Full wetting of the catalyst particle [18] No axial dispersion (Bo ) 1, based on dispersion relation trickle bed) [25] Pseudo homogeneous (phases are considered as one medium) The liquid phase properties are described with that of n-C 28 H 58 (N L = 28) [26] Molecules with chain length n 6 7 are in the gas phase (based on vapor pressures around 500 K) Molecules with chain length n > 7 are considered in liquid phase completely The liquid phase is saturated with H 2 and CO at the inlet of the reactor All tubes perform similar (the gas and liquid flow is uniformly distributed over all tubes) [31,32] q L Liquid phase density T, N L kg/m 3 [31,32] l L viscosity liquid T, N L kg/m/s [31,33] Table 3 Model assumptions CCFS model.…”

Prediction of Bulk Properties of Fischer−Tropsch Derived Liquids

“…Table 3 summarizes property data available for F-T waxes and related fluids used in the present study. A complete compilation of these data is presented elsewhere (Marano, 1996). The first three materials listed are finished-wax products.…”

Prediction of properties in homologous series with a shortcut QS2PR method

“…2,3 They are usually based on the Flory-Huggins ''mers'' approach. Because the carbon number-property relationships are asymptotic such correlations are often called ABCs (asymptotic behavior correlations).…”