Modeling the extraction of perylene from spiked soil material by dense carbon dioxide

The Influence of Entrainers on the Extraction of Polycyclic Aromatic Hydrocarbons from Contaminated Soils

“…Therefore, the operating lines give an idea of the adsorption isotherms. The nonlinear shape confirms also additional measurements including the modeling of the extraction process (19) and results of other authors (18,20). The operating line without entraîner ends at a concentration of about 10 ppm with a fluid concentration of virtually zero.…”

Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO2

“…Increasing temperature two contrary effects can be observed, the solvent density decreases and with it the solvent power of the SC‐CO 2 , whereas the solute vapour pressure of the solute increases, enhancing the extraction efficiency. Nevertheless, elevated temperatures are required for rapid and complete desorption of the contaminants from the soil when the pollutants are strongly linked to the adsorbent …”

“…Nevertheless, elevated temperatures are required for rapid and complete desorption of the contaminants from the soil when the pollutants are strongly linked to the adsorbent. 47 The optimal extraction conditions for the extraction of phenol and chlorophenols from GAC considering maximum yield criterion were found to be 31 MPa and 318.15 K with more than 60% of recovery in all cases. According to these results, it seems clear that the density is the main operating parameter affecting the extraction because the higher chlorophenol elution from the GAC is obtained at the lower temperature (318.15 K).…”

Cosolvent Effect of Methanol and Acetic Acid on Dibenzofuran Solubility in Supercritical Carbon Dioxide

“…However, sometimes the solubility of certain compounds in CO 2 is low, and a small amount of an organic substance (modifier or cosolvent) is added to enhance this solubility. Either pure or modified carbon dioxide is increasingly used to separate organic pollutants from solid matrixes for analytical and cleanup purposes. − Recently, Kawashima et al studied the removal of similar compounds from fish oils using CO 2 , and Gabarra et al studied the feasibility of using CO 2 and CO 2 modified with toluene to remove polychlorinated dibenzodioxins (PCDDs) and dibenzofurans (PCDBs) from fly ash in a solid-waste incineration facility. Methanol is a common cosolvent that has been proven to be effective for the extraction of pollutants from soils. , Methanol is also used for SFE of PCDDs and PCDBs from contaminated soils for analytical purposes .…”