Kong-Wei Cheng

Vapor-liquid equilibria at elevated pressures of binary mixtures of carbon dioxide with methyl salicylate, eugenol, and diethyl phthalate

Abstract A semi-flow type apparatus was used to measure the vapor–liquid equilibria (VLE) of CO2 with methyl salicylate, eugenol, and diethyl phthalate binary mixtures at 308.15, 318.15, and 328.15 K over the pressure range from 1.4 to 13 MPa. New VLE data for these binary mixtures are presented and the Henrys constants were determined from these results. The Soave–Redlich–Kwong and the Peng–Robinson equations of state, and the van der Waals, Panagiotopoulos–Reid and Huron–Vidal mixing rules are used to correlate these VLE data. It is shown that both equations of state with the van der Waals mixing rules and two adjustable parameters give satisfactory correlation results.

Calculations of solid solubility in supercritical fluids using a simplified cluster solvation model

A simplified cluster solvation model was employed in this study to correlate the solid solubility in supercritical fluids. Based on the concept of cluster solvation, several supercritical molecules were associated with a solid solute in chemical equilibrium. Solid solubility was calculated by applying the equilibrium criteria for the cluster formation process. This simplified model has two temperature-independent binary parameters. It is observed that the overall deviation in solid solubility calculations of binary systems from this model is comparable to that from other semi-empirical models with more optimally fitted parameters. This simplified cluster solvation model was extended to ternary and multi-component calculations by directly using the parameters from binary correlation results. Without any additional parameter, the predicted accuracy is still acceptable. Application of this model to systems with co-solvent has also been examined. A general trend for the variation of the effective association number with co-solvent concentration is observed.

Vapor–liquid equilibrium of carbon dioxide with ethyl caproate, ethyl caprylate and ethyl caprate at elevated pressures

Abstract Vapor–liquid equilibrium (VLE) data were measured for CO 2 with ethyl caproate, ethyl caprylate, and ethyl caprate using a semi-flow type apparatus at 308.2, 318.2 and 328.2 K over the pressure range from 1.6 to 9.2 MPa. In this paper, VLE data are reported. The VLE data were also correlated using the Soave–Redlich–Kwong and the Peng–Robinson equations of state with various mixing rules. It is shown that both equations of state agreed well with the experimental data.

Vapor–liquid equilibria of carbon dioxide with ethyl benzoate, diethyl succinate and isoamyl acetate binary mixtures at elevated pressures

Abstract Vapor–liquid equilibrium (VLE) data of CO 2 with ethyl benzoate, diethyl succinate, and isoamyl acetate binary mixtures were measured by a semi-flow type apparatus at 308.15, 318.15, and 328.15 K over the pressure range from 1.0 to 13 MPa. New VLE results for CO 2 with esters are presented and the Henrys constants are determined. These VLE data were also correlated using the Soave–Redlich–Kwong and the Peng–Robinson equations of state with various types of the van der Waals, composition-dependent and Huron–Vidal mixing rules. It is shown that both equations of state with the van der Waals mixing rules and two adjustable parameters give satisfactory correlation results.