Dynamisches Verhalten, Simulation und Regelung einer Flüssig/Flüssig‐Extraktionskolonne

Effects of Mass Transfer on the Steady State and Dynamic Performance of a Kühni Column − Experimental Observations

“…1. The combination of Pilhofer’s drop size distribution measurement technique (cited in Genenger et al) with the ultrasound Bonnet and Tavalarides for the dispersed-phase hold-ups and Hufnagl for the continuous measurement of the transferring solute concentrations provide satisfactorily fast, precise, reproducible, and almost noninvasive ways (due to sampling flows of only 2 to 3 × 10 −4 of the main-phase flows) of quantitatively investigating and characterizing the dynamic behavior of liquid−liquid dispersions in extraction columns.…”

“…The concentrations in both phases were measured in four compartments (8th, 14th, 23rd, and 32nd) axially positioned as shown in Figure . Special probes in PTFE − poly(tetrafluoroethylene) − shown in Figure and described by Hufnagl, which promote the separation between the two phases, were used to withdraw both phases separately; samples of the inlet and the outlet streams were also taken. The samples collected through capillary tubes (at about 1 mL/min of dispersion) fed density transducers, which continuously measured their densities, from which the phase concentrations were derived.…”

“…For this study involving mass transfer, experiments at room temperature, under both steady state and dynamic conditions, were performed under normal and extreme agitation intensity and dispersed and continuous-phase flowrates, and a constant continuous-/dispersed-phase flow ratio ( Q C / Q D = 1.28) was used. The standard operating conditions were defined as those corresponding to 70% of the global dispersed-phase hold-up measured near the flood-point, for two different sets of fluid flow velocities labeled as follows: B 1 2 : Q D = 120 L ·h −1 ; Q C = 94 L ·h −1 ; agitation rate = 170 rpm B 1 6 : Q D = 160 L ·h −1 ; Q C = 125 L ·h −1 ; agitation rate = 140 rpm …”