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High-pressure phase behavior and asymmetry effects in the CO2+butylcyclohexane plus o-terphenyl and CO2+bicyclohexyl plus o-terphenyl ternary systems
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DOI：10.1016/j.fluid.2026.114733.png)
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Abstract
En 中文
The phase behavior of two asymmetric ternary systems involving carbon dioxide, naphthenic hydrocarbons, and a heavy aromatic compound was investigated experimentally. The systems studied were CO2 + butylcyclohexane + o-terphenyl and CO2 + bicyclohexyl + o-terphenyl. The selection of butylcyclohexane and bicyclohexyl, representing a branched monocyclic and a bicyclic naphthene, respectively, enables an evaluation of how molecular structure influences phase equilibria in CO2-asymmetric mixtures. The presence of o-terphenyl introduces a high-melting-point aromatic component, enabling analysis of crystallization phenomena and solid-fluid transitions. Fluid-fluid phase equilibria, including liquid-vapor and liquid-liquid transitions, were measured over a temperature range from 273 to 373 K. In addition, solid crystallization transitions were determined at pressures up to 90 MPa. The effect of carbon dioxide concentration was examined across molar fractions ranging from 0 to 90 mol%.
Keywords:
High-pressure phase behavior
Asymmetric systems
Liquid-solid equilibrium
Liquid-liquid equilibrium
Liquid-vapor equilibrium
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2.7
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339
Citations:
1.5W
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