Smyth TJ, Zytner RG, Stiver WH. Influence of water on the supercritical fluid extraction of naphthalene from soil.
JOURNAL OF HAZARDOUS MATERIALS 1999;
67:183-196. [PMID:
10341301 DOI:
10.1016/s0304-3894(99)00043-6]
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Abstract
Supercritical fluid extraction (SFE) is an innovative soil remediation technology. To aid system evaluation and design, thermodynamic and kinetic parameters have been measured using a naphthalene contaminated, loamy sand at various water contents. The experimental results show that supercritical carbon dioxide can easily extract naphthalene from soil when the water content is below 10%. At low water contents, mass transfer is rapid and the equilibrium partition coefficient is independent of the soil's water content. However, the overall mass transfer coefficient, (kova), decreases by at least a factor of 200 as the water content increases from 10 to 20%.
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