SEPHIS code

Figure 10.13 Distribution coefficient of uranyl nitrate between 30 v/o TBP in hydrocarbon diluent and aqueous nitric acid at 40°C, from SEPHIS code.

In the SEPHIS code [W5] this distribution coefficient ratio DpJD j is evaluated from... 

Figure 10.17 Distribution coefficient ratio, tetravalent plutonium to hexavalent uranium in 30 v/o TBP, from SEPHIS code.

S. B. Watson md R. H. Rmney, Modfcations of the SEPHIS Computer Code for Calculating the Purex Solvent Extraction System, ORNL/TM-5123, Oak Ridge National Laboratory, Oak Ridge, Term., 1975. 

SECTOR, a modification of the computer code SEPHIS, has been used successfully to calculate solute behaviour in mixer-settler experiments. It also accounts for the oxidation of Pu(III) in the organic phase although improvements to this part of the code could be made when the kinetics of the oxidation are established. 

The SEPHIS [G6, H2, Wl] and SOLVEX [SI] computer codes are applications of the above techniques for calculating the number of equilibrium stages for the TBP extraction of uranium and plutonium in nitric acid solution. These codes include correlations of the... 

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