Measurement and modeling of extraction of chlorinated hydrocarbons from water with supercritical carbon dioxide

Document Type

Article

Publication Date

1-1-1994

Abstract

Supercritical-fluid extraction (SCFE) for the removal of toxic chlorinated organics from water has been studied using a continuous-flow view-cell system. The solubilities of pure 1,2-dichloroethane, 1,1,2-trichloroethane, and 1,1,2,2,-tetrachloroethane in subcritical and supercritical C02 have been obtained at 313.2 and 323.2 K and over a pressure range of 6.2-8.27 MPa. All the compounds studied were completely miscible in C02 at the temperatures studied and at pressure > 9 MPa. Equilibrium data for the removal of these compounds from water using supercritical C02 were obtained at two temperatures (313.2 and 323.2 K) and over a pressure range 9.65-16.54 MPa. The distribution coefficients (K-values) of these three compounds between supercritical C02 and an aqueous phases were in the range of 20 to 200. These high distribution coefficients verify that extraction with supercritical C02 is an effective method to remove chlorinated hydrocarbons from water. The results have been modeled using a hardsphere, perturbation-theory-based Camahan-Starling-DeSantis-Redlich-Kwong equation of state and simple mixture rules. © 1994.

Publication Source (Journal or Book title)

The Journal of Supercritical Fluids

First Page

201

Last Page

209

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