Prediction of unsymmetric convention liquid‐phase activity coefficients of hydrogen and methane

Abstract

A Corresponding states method has been developed to predict the binary parameter in the unsymmetric-convention one-term Margules relation for binary activity coefficients of H2 and CH4 in solvents. In addition to the solvent density, only characteristic volumes used previously for partial S. WASEEM BRELVI and JOHN P. OCONNELL molar volumes at infinite dilution and pure solvent compressibility are required. Comparisons with experiment for nonpolar solvents indicate that use of the method is usually significantly more accurate than assuming ideal solution (Henry's law). SCOPEThis paper describes liquid membranes capable of branes much more rapidly than others, and under approsimultaneously separating and concentrating specific salts.priate condition:, can be pumped against its concentrationIn other words, one salt can penetrate the liquid mem-gradient from a solution of low concentration to a solution

Effect of Ethanol and Temperature on Partition Coefficients of Ethyl Acetate, Isoamyl Acetate, and Isoamyl Alcohol: Instrumental and Predictive Investigation

“…This means that fugacity for solvents in their pure state is taken as a reference, complying with Raoult’s law. The flavor (2) is referenced to the state of “infinite dilution” therewith complying with Henry’s law through an unsymmetric fugacity referencing method. For our three components, eq now becomes The asterisk denotes that the activity coefficient is normalized using the unsymmetric convention.…”

- Molecular Thermodynamic Modeling of Fluctuation Solution Theory Properties

“…The ratio of properties in 9.24 is called the Krichevskii function, A Kr , and identified at the solvent critical point as the Krichevskii parameter (Levelt Sengers 1991). The first FST correlation for partial molar volumes of gases in liquids was done by Brelvi (Brelvi and O'Connell 1975c), using characteristic properties for his correlation of the reduced bulk modulus (Brelvi and O'Connell 1972). Recent work (Ellegaard, Abildskov, and O'Connell 2011) has used the form of Equation 9.4 for partial molar volumes of gases in ILs.…”

“…It is expected that this correlation, with an empirical value of 0 12 , would be adequate up to solute mole fractions of x 2 ~ 0.1. Brelvi (Brelvi and O'Connell 1975c) developed a correlation for 0 12 in the spirit of his prior work (Brelvi and O'Connell 1972).…”

“…It was noted much later that for molecular systems, these relations depended on the applicability of the "weak approximation" for angle-dependent intermolecular forces (Gray and Gubbins 1984;O'Connell 1994). In the absence of molecular simulations, this justified the successful applications of early works that used molecular theory (Gubbins and O'Connell 1974) and practical (Brelvi and O'Connell 1972, 1975b, 1975aBrelvi and O'Connell 1975c) perspectives, mainly via corresponding states. This FST approach was extended to correlate densities and activities of supercritical components in liquids and liquid mixtures (Mathias and O'Connell 1979;Mathias and O'Connell 1981;O'Connell 1981;Perry and O'Connell 1984) and of aqueous electrolyte solutions (Cabezas and O'Connell 1986;Cooney and O'Connell 1987;Perry, Cabezas, and O'Connell 1988;O'Connell, Hu, and Marshall 1999).…”

- Accurate Force Fields for Molecular Simulation

“…The first FST correlation for partial molar volumes of gases in liquids was done by Brelvi (Brelvi and O'Connell 1975c), using characteristic properties for his correlation of the reduced bulk modulus (Brelvi and O'Connell 1972). Recent work (Ellegaard, Abildskov, and O'Connell 2011) [Insert Figure 9.3]…”