Computerized automation of optical systems of the analytical ultracentrifuge

Technetium / Extraction kinetics / Transfer coefficients / Ultracentrifuge / DiffusionSummary. The lack of published data on the extraction kinetics of Tc(VII) in the system U(VI)/HNO 3 //TBP/dodecane prompted us to investigate its transport behaviour in detail. The aim was to improve the U(VI)/Tc(VII) separation in the PUREX process. We choose the method of analytical ultracentrifugation to determine the concentration gradient profile, the initial flux density and the integral mass transport for both sides of the unstirred liquid-liquid interface as well as the overall mass transfer coefficients as a function of Tc(VII)-, U(VI)-concentrations and temperature from timedependent changes of the refractive index gradients. The results were supplemented by comparing the experimental with calculated concentration profiles, obtained by modeling a diffusion-limited extraction process. In some of the investigated systems, the transport at the interface is reaction-limited after phase contact. The determined values of J max , I, and α are discussed in terms of the extraction conditions.

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“…The differential equations were solved by means of Laplacetransformation as described earlier [34][35][36]:…”

Section: Data Treatmentmentioning

confidence: 99%

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Ludwig¹,

Nguyen²,

Nabeshima³

2001

Radiochimica Acta

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A study on Schlieren patterns derived with the Beckman Optima XL-A UV-absorption optics

Cölfen

Harding

Analytical Ultracentrifugation

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Computerized automation of optical systems of the analytical ultracentrifuge

Cited by 2 publications

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Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

A study on Schlieren patterns derived with the Beckman Optima XL-A UV-absorption optics

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Computerized automation of optical systems of the analytical ultracentrifuge

Cited by 2 publications

References 0 publications

Determination of mass transfer coefficients of 99Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Determination of mass transfer coefficients of 99Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

A study on Schlieren patterns derived with the Beckman Optima XL-A UV-absorption optics

Contact Info

Product

Resources

About

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation

Determination of mass transfer coefficients of ⁹⁹Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation