ReDrop – A Simulation Tool for the Design of Extraction Columns Based on Single-Drop Experiments

The design of extraction columns based on information from lab experiments and
appropriate simulation tools allows reduction of time and costs compared to conventional
design methods using pilot-plant experiments. For this purpose, the
behavior of drops and drop swarms is investigated in lab-scale experiments in order
to create mathematical models containing system-specific parameters that
have to be fitted to those experiments. These models are implemented in a simulation
program that solves drop-population balances in extraction columns. At
AVT-Thermal Process Engineering of the RWTH Aachen University this concept
was implemented in the program ReDrop. ReDrop can predict the separation performance
and flooding point of pulsed sieve tray and structured as well as random-
packing extraction columns for standard and technical systems. The program
has successfully been extended to columns with rotating internals.