LLECMOD: A Bivariate Population Balance Simulation Tool for PulsedLiquid-Liquid Extraction Columns

摘要

A rigours mathematical model based on the bivariate population balance frame work (the base of LLECMOD“Liquid-Liquid Extraction Column Module”) for the steady state and dynamic simulation of pulsed liquid-liquid extractioncolumns is developed. The model simulates the coupled hydrodynamic and mass transfer for pulsed (packed andsieve plate) extraction columns. It is implemented using visual digital FORTRAN and then integrated into the LLECMODprogram. Experimental validated correlations are used for the estimation of the droplet terminal velocity in extraction columnsbased on single and swarm droplet experiments in laboratory scale devices. Additionally, recently published correlationsfor turbulent energy dissipation, droplet breakage and coalescence frequencies are discussed as being used in thisversion of LLECMOD. In a case study, LLECMOD is used here to simulate the steady state performance of pulsed extractioncolumns with two chemical test systems recommended by the European Federation of Chemical Engineering (water-acetone-n-butyl acetate and water-acetone-toluene) and an industrial test system. Model predictions are successfullyvalidated against steady state and transient experimental data, where good agreements are achieved. The simulated results(holdup, mean droplet diameter and mass transfer profiles) compared to the experimental data show that LLECMOD is apowerful simulation tool, which can efficiently predict the dynamic and steady state performance of pulsed extraction columns.