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Highly CO2-Soluble Chelating Agents for Supercritical Extraction and Recovery of Heavy Metals

Published online by Cambridge University Press:  15 February 2011

A. Yazdi  and
E. J. Beckman
A. Yazdi
Affiliation:
Chemical Engineering Department, Univ. of Pittsburgh, Pittsburgh, PA 15260
E. J. Beckman
Affiliation:
Chemical Engineering Department, Univ. of Pittsburgh, Pittsburgh, PA 15260
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Abstract

Carbon dioxide is an attractive organic solvent in today's chemical process environment in that it is non-flammable, inexpensive, and exhibits low toxicity. Further, materials solubilized in carbon dioxide are easily and completely recovered/concentrated from solution via a simple pressure quench. Despite these favorable properties, CO2 is non-polar, and as such is a very poor solvent for materials such as conventional metal chelating agents, thus blocking application of carbon dioxide in metal extraction/recovery. Consequently, we are exploring the molecular design of materials which are highly CO2-philic, that is, they exhibit solubilities in carbon dioxide which are significantly greater than alkanes with the same number of main-chain atoms. By functionalizing chelating moieties with CO2-philic oligomers, we have generated materials which both effectively extract metals from solid matrices and which dissolve in carbon dioxide in significant quantities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 211
Copyright
Copyright © Materials Research Society 1994

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