High pressure phase behaviour for the CO2 + n-dodecane + 3,7-dimethyl-1-octanol system

Add time:08/19/2019    Source:sciencedirect.com

In this work, the solute-solute interaction which exist in the CO2 + n-dodecane+ 3,7-dimethyl-1-octanol system was investigated. Solubility data were measured for three mixtures containing solvent free n-dodecane fractions of 0.50, 0.75 and 0.85, between 308 K and 348 K and pressures up to 14.9 MPa, with solvent mass fractions ranging from 0.375 to 0.984, using a static synthetic method. The data revealed significant solute-solute interactions, which resulted in the occurrence of co-solvency in the two n-dodecane rich mixtures. The phase behaviour data of the system was modelled, using the RK-ASPEN model. The modelling results indicated that, with the inclusion of a solute-solute interaction parameter, the fitted model was capable of correlating fairly accurate solubility data, but it can only approximate vapour-liquid-equilibrium data.

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