Properties required by extractants and diluents for the decontamination of liquid wastes using supported liquid membranes

Book · Fri Dec 31 04:00:00 EST 1993

OSTI ID:113149

Dozol, J F; Rouquette, H; Eymard, S; Tournois, B ^[1]

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1. CEA, St. Paul lez Durance (France). Waste Management and Disposal Dept.

Macrocyclic extractants are now being studied more and more often for the decontamination of radioactive liquid wastes: coronands (crown ethers, azacrown...) and cryptands. As these very sophisticated compounds are expensive, the best technique is supported liquid membranes which need a very low extractant inventory. This paper deals with the properties required by the extractant and the diluent in order to be used in an SLM device and to ensure a stable and efficient SLM: solubility of the extractant in organic compounds and in aqueous solutions; size of crown ether cavities; influence of the substituent groups on the selectivity of the crown ether; and influence of the properties of the diluent (polarity, transport of acidity) on the efficiency of the process and on the stability of the membrane (interfacial tension between the organic and aqueous phases, solubility in the aqueous phase). The influence of these parameters is illustrated by experiments performed in order to remove strontium and cesium from high sodium content liquid waste. The studies described in this paper are focused on the decategorization of evaporator concentrates arising from the reprocessing of spent fuel.

• OSTI ID: 113149
• Report Number(s): CONF-930906--; ISBN 0-7918-0691-X
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
CESIUM
EXPERIMENTAL DATA
FUEL REPROCESSING PLANTS
LIQUID WASTES
MATERIALS TESTING
MEMBRANE TRANSPORT
ORGANIC SOLVENTS
RADIOACTIVE WASTE PROCESSING
SOLVENT PROPERTIES
STRONTIUM
SUPPORTED LIQUID MEMBRANES
TECHNOLOGY ASSESSMENT