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2012•Arab Journal of Nuclear Sciences and ApplicationsRequires access

Separation of Ce(IV) from High Concentration Nitric Acid Medium by Cyanex-302 and Cyanex-921 Kinetic,Thermodynamic and Reaction Mechanism

N. El-Said, A. S. Mekhael, E. El-Shreif

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Abstract

The kinetic extraction of tetravalent cerium(IV) from high concentration nitric acid medium (9M HNO3+2M Na2BrO3) by Cyanex 302 and Cyanex 921 in kerosene was investigated using Lewis cell. The effects of stirring speed, temperature and specific inte rfacial area on the extraction rate were studied. The results showed that the reaction is controlled by a chemical reaction in the interface rather in the bulk phase for Cyanex-921.The results showed that the activation energies was found to be 29.4±0.5 kJ Mol –1 , the heat of activation is 28.2±0.25 kJ Mol –1 while the entropy was –103 kJ Mol –1 for Cyanex-921. The Cyanex–302 showed unstability in 9M HNO3 medium. The extraction process was expressed by a reaction mechanism in which the extracted species were investigated.

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What this paper is about

The kinetic extraction of tetravalent cerium(IV) from high concentration nitric acid medium (9M HNO3+2M Na2BrO3) by Cyanex 302 and Cyanex 921 in kerosene was investigated using Lewis cell. The effects of stirring speed, temperature and specific inte rfacial area on the extraction rate were studied. The results showed that the reaction is controlled by a chemical reaction in the interface rather in the bulk phase for Cyanex-921.The results showed that the activation energies was found to be 29.4±0.5 kJ Mol –1 , the heat of activation is 28.2±0.25 kJ Mol –1 while the entropy was –103 kJ Mol –1 for Cyanex-921. The Cyanex–302 showed unstability in 9M HNO3 medium. The extraction process was expressed by a reaction mechanism in which the extracted species were investigated.

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Available abstract

The kinetic extraction of tetravalent cerium(IV) from high concentration nitric acid medium (9M HNO3+2M Na2BrO3) by Cyanex 302 and Cyanex 921 in kerosene was investigated using Lewis cell. The effects of stirring speed, temperature and specific inte rfacial area on the extraction rate were studied. The results showed that the reaction is controlled by a chemical reaction in the interface rather in the bulk phase for Cyanex-921.The results showed that the activation energies was found to be 29.4±0.5 kJ Mol –1 , the heat of activation is 28.2±0.25 kJ Mol –1 while the entropy was –103 kJ Mol –1 for Cyanex-921. The Cyanex–302 showed unstability in 9M HNO3 medium. The extraction process was expressed by a reaction mechanism in which the extracted species were investigated.

Key concepts: Nitric acid, Chemistry, Kinetic energy, Extraction (chemistry), Cerium, Kerosene, Nuclear chemistry, Reaction rate

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Separation of Ce(IV) from High Concentration Nitric Acid Medium by Cyanex-302 and Cyanex-921 Kinetic,Thermodynamic and Reaction Mechanism — Research Paper | ScholarLens