Abstract
Phase equilibria of CO2+limonene, CO2+1,2,3-trimethylbenzene, CO2+p-cymene and CO2+m-cymene systems were measured to investigate the possibility of extraction of these components from tyre derived oil using supercritical CO2. Measurements were conducted using variable-volume view cells at four temperatures between 313 and 358K, with solute mass fractions ranging from 0.0159 to 0.635. The maximum total solubility pressure measured was 16.5MPa. The phase behaviour of the systems indicated that an increase in system temperature leads to an increase in phase transition pressure at constant composition. The solubility differences between the components increase slightly with the temperature, however a sufficient pressure difference exists for 1,2,3-trimethylbenzene to be isolated at temperature higher than 343K. Experimental data of four binary systems were satisfactory correlated by using the Redlich-Kwong-Soave equation of state, along with Mathias-Klotz-Prausnitz mixing rules, which include two temperature independent binary interaction parameters.
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