High Pressure Vapor–Liquid Equilibrium Data for the Quaternary Carbon Dioxide + 1-Decanol + 3,7-Dimethyl-1-octanol + n-Dodecane System

Abstract

Vapor−liquid equilibrium (VLE) data were measured for the quaternary system containing CO 2 , n-dodecane (nC 12 ), 1-decanol (C 10 OH), and 3,7-dimethyl-1-octanol (37DM1O). The data were measured using a previously constructed static-analytic setup at temperatures between 308 and 348 K and pressures up to 19.2 MPa. The measured data indicated signs of a temperature inversion in the 1-decanol-rich mixtures. The relative solubility analysis revealed that the components in the 1-decanol-rich mixtures could be separated with greater ease than the components in the n-dodecane-rich mixture. The greater difficulty associated with separating components in the n-dodecane-rich mixture is likely linked to cosolvency effects which cause pinches in separation. The data were modeled in Aspen Plus, using the RK-ASPEN model. The modeling results highlighted the need for fitted solute−solute interaction parameters. However, even with the inclusion of these parameters there still exists significant deviation between the experimental and predicted data. The RK-ASPEN model can, therefore, only be used to approximate VLE data for the system.

Experimental determination and modelling of high-pressure phase behavior for the binary system CO2 + cyclooctane

“…A were fitted to experimental data. The optimal values that minimize the deviations between calculated and experimental phase compositions are: 12 309.4 AK  and 21 4.566 AK  .…”

“…The continuous increase of research articles devoted to high-pressure phase equilibria during the last 35 years shows the vitality of the supercritical fluid domain and the development of high-pressure processes [1,2]. Among these numerous papers, CO 2 remains the pure compound that is involved the most often in the investigated binary, ternary or more complex mixtures [3][4][5][6][7], especially because it is widely used in supercritical fluid separation processes. CO 2 is also a major greenhouse gas, and one of the technologies implemented to achieve carbon neutrality is the gas injection technique using captured CO 2 , which is now routinely employed, not only to enhance oil recovery, but also to geologically store the CO 2 .…”