Abstract
Ternary VLE data produced on a static analytic apparatus with dual sampling and online chromatography are presented for CO2 + n-dodecane (nC12) + 1-decanol (C10OH) at 35, 55 and 75 °C and pressures between 68 and 200 bar. Cell interior photos illustrate the value of visual observation to gauge the extent of phase separation. Co-solvency, where the ternary mixture is more soluble than the constituent binaries, occurs in the high-nC12 region. Relative solubility, a selectivity indicator, increases with C10OH content, the average of 2.25 highlights solvent efficacy, and solutes fractionation is possible across the measured nC12:C10OH ratio range. RK-ASPEN, SR-POLAR, PR-BM and PC-SAFT correlations failed at 35 °C. At 55 and 75 °C, RK-ASPEN produced the smallest percentage average absolute deviation in equilibrium pressure of 3.1%, marginally outperforming SR-POLAR and PR-BM. SR-POLAR was best-able to correlate the acute co-solvency pinch and RK-ASPEN vapour correlations were superior. Density inversions were observed.
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