Adsorption Kinetics and Breakthrough Behaviour of Tri-n-butyl Phosphate on Amberlite XAD-4 Resin.

Abstract

Adsorption behaviour of tri-n-butyl phosphate (TBP) from aqueous solution (dilute HN03) on Amberlite XAD-4 has been investigated experimentally. Factors affecting the adsorption rates and breakthrough curves have been studied in batchwise and semicontinuous fixed bed adsorber. The adsorption isotherm of TBP on Amberlite XAD-4 resin have also been determined and the Freundlich model of adsorption is used to describe adsorption equilibrium. For the case of nonlinear equilibrium a simplified method proposed by Chi Tein is used to estimate intraparticle diffusion coefficient. The intraparticle diffusion coefficient is found to be in the range of 10-8cmZ~s-'. Results of fixed bed column are used to estimate mass transfer zone (MTZ) length, length of unused bed (LUB), breakthrough capacity corresponding to fixed value of effluent concentration (5 mg/l of TBP) and degree of saturation of bed at breakthrough. The MTZ length was found to vary from 21.8 cm to 37.3cm when flow rate changed from 13.5 mllmin to 52 mllmin, whereas column utilization ranged from 65.1% for the lowest flow rate to 43.5% for the highest flow rate.

Status Summary of Chemical Processing Development in Plutonium-238 Supply Program

“…Analysis of oxide samples from Demonstration 1B will be informative, as the Pu product solutions in that campaign were subjected to boiling in strong acid, which may have destroyed most of the organophosphorus compounds. Diluent washing (Whatley 1984), resin treatment (Pandey et al 1998, Navratil 1981, or both may be effective in reducing P content in the solutions prior to resin loading and firing.…”

Adsorption of Tri‐n‐Butyl Phosphate (TBP) from NaClO4 Aqueous Solution on Hg Electrode

“…The adsorption occurs in the potential range from approximately 0 V up to À 1.3 V vs. SCE. Adsorption of TBP was also reported on silica gel [6], mineral surfaces [7], Amberlite XAD-4 resin [8] and clay [9].…”