Vapor–Liquid Equilibrium Measurements for the Ternary Systems of CO₂ + n-Hexane + n-Decane and CO₂ + n-Octane + n-Decane

Abstract

The experimental vaporÀliquid equilibrium (VLE) data for two ternary systems containing CO 2 + n-alkane + n-decane were measured using an online staticÀanalytic apparatus with a movable ROLSI sampler. The studied CO 2 + n-hexane + n-decane and CO 2 + n-octane + n-decane systems were measured at temperatures of (312.89, 342.50, and 376.20) K and (313.59, 344.28, and 373.49) K, respectively. The PengÀRobinson equation of state was used to predict the VLE data of the ternary systems from the temperatureÀindependent interaction parameters of the binary systems.

New Vapor–Liquid Phase Equilibrium Data of CO2 in Several Heavy n-Alkanes at High Pressures

“…The minimum miscibility pressure (MMP) at which crude oil and CO 2 become miscible plays a critical role in determining the CO 2 displacement efficiency and economic benefit of crude oil. − This parameter will be obtained from equilibrium data and a typical equilibrium curve for a binary mixture on an x – y plot. High-pressure and high-temperature phase equilibrium data and experimental methods have been reviewed by Fornari, Dohrn and Brunne, Christov and Dohrn, and more recently Dohrn, Peper, and Fonseca. − Equilibrium data for binary (CO 2 + light alkanes) mixtures are plentiful, such as phase equilibrium data of CO 2 in CH 4 at supercritical pressures of 3.157–8.322 MPa and a temperature of 270 K were measured by Fahad; phase equilibrium data of CO 2 in n -hexane + n -decane and n -octane + n -decane at supercritical pressures of 2–14 MPa and temperatures of 312.89–376.20 K were measured by Carmen; and phase equilibrium data of CO 2 in n -pentane at supercritical pressures of 1.2–9 MPa and temperatures of 408.15–463.15 K were measured by Leu, while fewer data exist for the binary mixture classes (CO 2 + heavy alkanes).…”

Estimation and Correlation of Phase Equilibrium of CO2–Hydrocarbon Systems with PRMHV2-UNIFAC and PRMHV2-NRTL Models

“…Comparison of experimental data from ref and calculation results by two models for the CO 2 –octane–decane system.…”