Supercritical Extraction of Pollutants from Water and Soil

Modeling of supercritical extraction of organics from solid matrices

“…Supercritical dioxide has been used to regenerate carbon loaded with organic compounds (Model1 et al, 1979;de Filippi et al, 1980;Liou, 1988, 1989a;Madras et al, 1993a) and soil loaded with heavy molecular weight organics (Dooley et al, 1987;Roop et al, 1989;Akgerman et al, 1992;Erkey et al, 1993). Other applications include purification of polymers (McHugh and Krukonis, 1986) and extraction of lignocellulosic material from wood (Li and Kiran, 1987;Goto et al, 1990).…”

Molecular thermodynamics of solute‐polymer‐supercritical fluid systems

“…Other desirable features of C02 are that it is released rather rapidly and fully from the polymer after depressurization, and it is less toxic than most liquid solvents. Potential applications include impregnation of polymers for controlled release, extraction of pollutants from adsorbents (Roop et al, 1989;King et al, 1988), purification of specialty polymers, for example, for biomedical or electronic applications and the UNICARB spray process (Hoy and Do-Correspondence concerning this article should be addressed to K. P. Johnston. nohue, 1990).…”

Supercritical extraction of contaminants from soils and sediments

“…Water has a significant influence on the SCE of organics from solid matrices, even for low natural water content [19,45,74,75]. The water content of the samples and the presence of cosolvent were the most important factors affecting desorption of PCBs from sediments [45].…”

“…However, at >20% water, mass transfer was ∼10 times slower than at water contents of <10%. When phenol was extracted from dry and wet soil contaminated with 1 wt.% PhOH using SCCD [19], it was concluded that soil moisture had a major impact on the effectiveness of entrainers for soil SCE.…”