Measurement and correlation of high pressure vapor-liquid equilibria for the systems ethylene-1-butene and ethylene-propylene.

Abstract

An apparatus is newly designed and constructed for investigation of high-pressure vapor-liquid equilibrium in the temperature range-50°C to 50°C at pressures up to 100 atm. The visual type of static apparatus is distinguished by the inclusion of a specially designed sampling device for liquid phase to reduce experimental error during the sampling, and of a magnetically driven agitator by which the vapor phase is dispersed into the liquid phase within the cell. Using this apparatus, the binary vapor-liquid equilibrium data for the ethylene-propylene system at-10.08°, 0.07°, 10.07°and 20.14°C, and ethylene-1-butene at-0.01°, 10.01°and 20.20°C are measured. The data obtained are correlated by using three equations of state. The predicted results are in good agreement with the experimental data except in the region close to the critical point.

Thermodynamic consistency of vapor‐liquid equilibrium data at high pressure

“…Ethene/l-Butene at 293.35 K (System 0, data set from Bae et al, 1981). Jackson and Wilsak (1995) examined this system, but, since their model could not be used for VLE calculations near the critical region, they included only seven data points in the regression; moreover, they calculated an erroneous behavior on the supercritical-component side of the P-x,y diagram.…”

High pressure vapor-liquid equilibria for binary systems of carbon dioxide -pentane, -isoprene, -1-pentene and -2-pentene.

“…1. It consists of four sections: [1] equilibrium cell, [2] sampling device, [3] sample analyzing system, and [4] temperature and pressure measurement device.…”

“…The samplings for the vapor phase were made using a 1mm-diameter capillary tube which was equipped with two valves 5 and 5', and for the liquid phase using a 5mm-diameter stainless steel rod(6) which had a small hole for withdrawing the sample (the detail of the liquid-sampling device and procedure was reported in the literature by Nagahama et al 4)). The approximate sampling volumes were 0.7cm3 for the vapor phase and 0.005cm3 for the liquid phase, respectively.…”

The Measurement of High Pressure Vapour‐Liquid‐Equilibria: Part I: Dynamic Methods

“…[12] has a unique sampling device. Its principle subsequently formed the basis of the liquid sampling devices of Meister [50], and those developed for the static equilibrium cells of Bae et al [51], Ng and Robinson [5], and Muhlbauer and Raal [18]. It had a 5 mm diameter rod with a 3.5 pl hole drilled near its tip.…”