Effect of supercritical fluid extraction parameters and clay properties on the efficiency of phenanthrene extraction

Modeling of supercritical fluid extraction of phenanthrene from clayey soil

“…The concentration results predicted by the proposed model after SFE extraction are compared with the laboratory test results performed by the authors [4]. In the SFE lab tests, the SFC (carbon dioxide) with and without methanol modifier was used for removal of PAHs (phenanthrene montmorillonite).…”

“…The extraction pressure and temperature for all cases were taken to be 55 MPa (8000 psi) and 1508C, respectively. During the tests, the flow rate of CO 2 was held constant at approximately 2.5 mL/min [4]. Table 1 shows that the adsorption concentration varied in function of dynamic time (t d ).…”

“…Under a high pressure, interactions between gas molecules and soil particles decrease with time over 10 min. Figure 4 presents the predicted values of the efficiency of the recovery under the extraction of the phenanthrene in effluent of sample S7 [4] together with the results of laboratory tests. It can be noted from this figure that the proposed model predicts the values of recovery within differences of 5 -26% of the experimental results.…”

“…Supercritical fluids (SFCs) have proved to be effective in the extraction of PAHs from soils due to their unique characteristics [4]. SFC (e. g., carbon dioxide) have liquidlike densities, gas-like viscosities, and diffusivities at least an order of magnitude higher than liquids, which may result in superior mass-transfer characteristics.…”

Supercritical CO2 extraction of PAHs on spiked soil

“…The advantages of using CO 2 include the affinity for non-polar contaminants that are tightly adsorbed into solid particulates [2][3][4]. The number of factors influencing the efficiency of supercritical carbon dioxide extraction (SCCDE) is considerable [3,5], i.e.…”