The performance of pulsed scale-up column for permeable of selenium and tellurium ions to organic phase, case study: Disc and doughnut structure

Abstract

A research investigation of the overall mass transfer coefficients, holdup and mean drops of dispersed phase as well as slip and characteristic velocities were carried out in the pulsed scale-up column with disc and doughnut structure for extraction of tellurium and selenium from a hydrochloric acid medium with TBP extractant. The impact of operating conditions containing the pulse intensity, inlet aqueous and solvent phase velocities have been studied on the mass transfer rates, and the special column characteristic. By considering the reactive extraction situations, modified models were derived for predicting of holdup, d32, and slip velocity in this extractor. The axial diffusion model for extracting the selenium and tellurium using the TBP system was utilized to determine the mass transfer evaluation. Mass transfer data indicated that the column performance enhanced by increasing the pulse intensity and inlet phase velocities. Because of the reactive extraction system, available correlations failed to correctly estimate the mass transfer data. Thus, a novel model based on dispersed phase holdup, Eö, and Re numbers was developed to estimate the enhancement factor. The values calculated by the derived correlation were compared with the experimental results, and a good agreement was obtained between results.