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Fluid dynamics simulation of highly loaded anion-exchange chromatography of Np(IV) based on adsorption isotherm determined by237+239Np

Journal of Alloys and Compounds
Publication Date
DOI: 10.1016/j.jallcom.2007.05.101
  • Neptunium
  • Preparatory Chromatography
  • Highly Loaded Condition
  • Elusion Curve
  • Fluid Dynamic Simulation
  • Mathematics
  • Physics


Abstract In order to investigate the optimum condition for anion-exchange chromatography for purification and recovery of actinide(IV) constituting transuranium elements, a convective-diffusion equation model treating mass balance and Langmuir-type kinetics in porous system, which was developed for thorium(IV) by us, was applied to neptunium(IV). Absorption isotherm of neptunium(IV) to anion-exchange (MSA-1) resin was carried out by using 237+239Np in 6N HNO 3 media and hereby parameters of the Langmuir-type kinetics were determined as k 0 = 2.5 × 10 3 and s max = 1.0. Accompanied with the fluid dynamics parameters already determined for the column system used for 227+232Th, elution curves of neptunium(IV) at highly loaded condition were estimated by the numerical calculation. According to the result, the loading of more than 10% of resin capacity leads to rapid breakthrough and severe tailing of neptunium which lowers purity and yield in the purification procedure. This numerical calculation will serve as a valuable measure to figure out column operation conditions for purification and recovery of transuranium elements.

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