Spectroscopy, modeling and computation of metal chelate solubility in supercritical CO{sub 2}

Technical Report · Fri Dec 10 00:00:00 EST 1999

DOI:https://doi.org/10.2172/750972· OSTI ID:750972

Brennecke, J F; Stadtherr, M A

The overall objectives of this project were to gain a fundamental understanding of the solubility and phase behavior of metal chelates in supercritical CO{sub 2}. Extraction with CO{sub 2} is an excellent way to remove organic compounds from soils, sludges and aqueous solutions, and recent research has demonstrated that, together with chelating agents, it is a viable way to remove metals, as well. In this project the authors sought to gain fundamental knowledge that is vital to computing phase behavior, and modeling and designing processes using CO{sub 2} to separate organics and metal compounds from DOE mixed wastes. The overall program was a comprehensive one to measure, model and compute the solubility of metal chelate complexes in supercritical CO{sub 2} and CO{sub 2}/cosolvent mixtures. Through a combination of phase behavior measurements, spectroscopy and the development of a new computational technique, the authors have achieved a completely reliable way to model metal chelate solubility in supercritical CO{sub 2} and CO{sub 2}/co-contaminant mixtures. Thus, they can now design and optimize processes to extract metals from solid matrices using supercritical CO{sub 2}, as an alternative to hazardous organic solvents that create their own environmental problems, even while helping in metals decontamination.

• Research Organization: UDDOE Idaho Operations Office, Idaho Falls, ID (US); Univ. of Notre Dame, IN (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: FG07-96ER14691
• OSTI ID: 750972
• Report Number(s): DOE/ER/14691; TRN: US0002965
• Resource Relation: Other Information: PBD: 10 Dec 1999
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
SUPERCRITICAL GAS EXTRACTION
CARBON DIOXIDE
SOLVENT PROPERTIES
METALS
CHELATING AGENTS
SOLUBILITY
PHASE STUDIES
HAZARDOUS MATERIALS
RADIOACTIVE WASTES
MIXTURES
DEMETALLIZATION
MATHEMATICAL MODELS
PHASE BEHAVIOR
METAL CHELATES
SUPERCRITICAL CO2
EXTRACTION
MIXED WASTES
CO2/COSOLVENT MIXTURES
INTERVAL MATHEMATICS
REGULAR SOLUTION THEORY
SPECTROSCOPY