Proposed empirical correlations of the extractive distribution and overall mass transfer coefficients in the Purex H2O-HNO3-U(VI)-30% tri-n-butylphosphate/dodecane liquid system are compared with experimental data. The roles of eddy diffusion and interphase chemical reactions in the transfer kinetics are discussed. These equations are incorporated into the DYNAC computer model and applied to the analysis of a plantsized pulsed-column connection. The predicted profiles of the uranium concentration and the temperature are in good agreement with the experimental data under steady-state and transient operating conditions. Hence, the kinetic correlations have proven useful in expressing the chemical and diffusional nature of solute transfer.

M.F. Pushlenkov

Papers

STUDY OF THE RATE OF EXTRACTION IN SYSTEMS WITH TRIBUTYL PHOSPHATE. III. EXTRACTION OF UO$sub 2$(NO$sub 3$) .