Regular Solution Theory Model Used to Predict Supercritical CO2 Extraction of p-chlorophenol Contaminate from Water Stream

The objective of this paper is the assessments of the feasibility of the extraction process utilizing a near critical carbon dioxide solvent with p-chlorophenol contaminate solute, which would be speeded up if it were possible to predict mutual solubility data. The use of equations of state or empirical correlations for collating and predicting liquid-liquid and liquid-dense fluid equilibrium depend on critical constants properties which are not easy to obtain for complex heavy component contaminate solute and therefore, would be for the prediction of solubility related to vapor phase only. It is concluded that the estimation by using equation of state for some of the parameters required these calculations would be difficult if the solute was a complex substance about which little was known apart from its structural formula. An alternative procedure is to apply activity coefficient expressions of the regular solution theory to each phase. Calculations along these lines are described and the physical basis for applying these methods under the relevant conditions discussed. Regular solution theory approach in particular has been found to be that the interaction parameters for the prediction activity coefficients must be regarded as pressure dependent and therefore would be independent to temperature