Fluid dynamics simulation of highly loaded anion-exchange chromatography of Np(IV) based on adsorption isotherm determined by 237+239Np

Tomoo Yamamura, T. Mitsugashira, Y. Shiokawa, Dai Aoki, Yoshiya Homma

Research output: Contribution to journalArticle

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 HNO3 media and hereby parameters of the Langmuir-type kinetics were determined as k0 = 2.5 × 103 and smax = 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.

Original languageEnglish
Pages (from-to)647-651
Number of pages5
JournalJournal of Alloys and Compounds
Volume444-445
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2007 Nov 1

Keywords

  • Elusion curve
  • Fluid dynamic simulation
  • Highly loaded condition
  • Neptunium
  • Preparatory chromatography

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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