• axial mixing and mass transfer investigation in a pulsed packed liquid–liquid extraction column using plug flow and axial dispersion models

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 718
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     in this research work, the volumetric overall mass transfer coefficient based on continuous-phase (koca) and axial dispersion coefficients of phases (eced) in a pilot pulsed packed liquid extraction column (pplec) have been studied using plug flow model (pfm) and axial dispersion model (adm). experiments have been carried out using standard systems of water/acetone/toluene and water/acetone/n-butyl–acetate. values ofkoca evaluated by adm are greater than those of pfm by about 20% indicating that the axial mixing lowers the performance of pplec. it was found that the drop-size distribution is the main cause of the axial mixing in pplec. increase in dispersed phase flow rate (qd), increases all kocaed and ec and the minimum values of both ed and ec and the maximum values of koca are in pulse intensity ranges of 0.8–1 cm/s. finally, three empirical correlations are proposed for the prediction of these parameters which are in good agreement with the experimental data.

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