Abstracts and Available Papers Presented at the
1998 International RERTR Meeting

DISSOLUTION AND ION EXCHANGE OPERATIONS MATHEMATICAL
MODELING IN A ⁹⁹MO PRODUCTION PROCESS
FOR MEDICAL PURPOSES

M. A. Gonçalves, A. R. L. Nery, M. Yamaura, M. C. F. C. Felinto,
R. L. Camilo, V. H. Cohen

MQT - Divisão de Tecnologia Química e Ambiental
Instituto de Pesquisas Energéticas e Nucleares
Travessa R, 400 Cidade Universitária
05508-900 São Paulo SP Brazil

E-mail:[email protected]

Abstract

This work deals with the mathematical modeling of target dissolution and AG1X8 ion exchange column in the process employed to obtain ⁹⁹Mo from irradiated LEU (low enrichment uranium) targets.

Parameters describing temperature influence on reaction rate and the order of cladding dissolution reaction were determined. In order to obtain the parameters needed to modeling the breakthrough and elution curves of AG1X8 purification column, adsorption equilibrium isotherms were studied in molybdenum concentration range from 1 mg/L to 10 g/L in alkaline media at room temperature, 40 ºC and 60 ºC. Langmuir and Freundlich models were used to fit adsorption isotherms data and numerical optimization was applied to calculate mass transfer coefficients, needed to solve the partial differential equations describing the column loading and elution steps.

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