Abstract
ABSTRACT The kinetics of europium extraction into D2EHPA is studied in a stirred cell. For the range of concentrations investigated (10−6kmol/m−3 ≤ [Eu3+] ≤ 10−4kmol/m3; 0.01 kmol/m3 ≤ [H +] ≤ 0.15 kmol/m3; 0.001 kmol/m3 ≤ [(HX)2] ≤ 0.05 kmol/m3) extraction rate increases linearly with stirring speed, i.e. mass transfer is limited by diffusion. An increase in proton concentration or a decrease of complexant concentration reduces fluxes but does not change the extraction regime. Based on the found equilibrium constant and individual mass transfer coefficients, extraction rates are calculated showing good agreement with experimental data. The influence of concentrations on extraction rate is explained by the gradient between bulk concentration and interfacial concentration as the driving force for mass transfer in an extraction system controlled by diffusion.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.