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Supercritical Fluid Extraction of Plutonium and Americium from Soil

Description: Supercritical fluid extraction (SFE) of plutonium and americium from soil was successfully demonstrated using supercritical fluid carbon dioxide solvent augmented with organophosphorus and beta-diketone complexants. Spiked Idaho soils were chemically and radiologically characterized, then extracted with supercritical fluid carbon dioxide at 2,900 psi and 65°C containing varying concentrations of tributyl phosphate (TBP) and thenoyltrifluoroacetone (TTA). A single 45 minute SFE with 2.7 mol% TBP… more
Date: August 1, 2002
Creator: Fox, Robert Vincent & Mincher, Bruce Jay
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Influence of fluid-property variation on turbulent convective heat transfer in vertical annular channel flows.

Description: Influence of strongly-varying properties of supercritical-pressure fluids on turbulent convective heat transfer is investigated using direct numerical simulation. We consider thermally-developing upward flows in a vertical annular channel where the inner wall is heated with a constant heat flux and the outer wall is insulated. CO2 is chosen as the working fluid at a pressure to 8 Mpa, and the inlet Reynolds number based on the channel hydraulic diameter and the bulk velocity is Re0 = 8900. It i… more
Date: October 1, 2005
Creator: McEligot, D. M.; Bae, J. H.; Yoo, J. Y.; Choi, H. & Wolf, James R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Supercritical Fluid Extraction of Plutonium and Americium from Soil

Description: Supercritical fluid extraction (SFE) of plutonium and americium from soil was successfully demonstrated using supercritical fluid carbon dioxide solvent augmented with organophosphorus and beta-diketone complexants. Spiked Idaho soils were chemically and radiologically characterized, then extracted with supercritical fluid carbon dioxide at 2,900 psi and 65 C containing varying concentrations of tributyl phosphate (TBP) and thenoyltrifluoroacetone (TTA). A single 45 minute SFE with 2.7 mol% TBP… more
Date: May 23, 2002
Creator: Fox, R. V. & Mincher, B. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Report: Natural State Models of The Geysers Geothermal System, Sonoma County, California

Description: Final project report of natural state modeling effort for The Geysers geothermal field, California. Initial models examined the liquid-dominated state of the system, based on geologic constraints and calibrated to match observed whole rock delta-O18 isotope alteration. These models demonstrated that the early system was of generally low permeability (around 10{sup -12} m{sup 2}), with good hydraulic connectivity at depth (along the intrusive contact) and an intact caprock. Later effort in the p… more
Date: December 31, 2001
Creator: Brikowski, T. H.; Norton, D. L. & Blackwell, D. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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