455255 Design of Taylor-Couette Disc Contactors
In order to ensure economical and efficient operating points of any kind of reactor, they have to be designed appropriate for their application. For the design of continuously operating reactors, like the TCDC, the ideal plug flow reactor (PFR) and the continuously stirred tank reactor cascade (CSTR) model are applied. With these basic design concepts either the separation efficiency for a given column height, or the column height for continuous separation processes can be obtained. However, the initial points for these calculations is given by information about the hydrodynamic characteristics of the reactor. With given phase ratio and rotational speed the mean sauter diameter and dispersed-phase hold-up can be determined by empirical correlations. Hence the specific mass-transfer area in the column can be predicted and the reactor behavior is characterized.
For hydrodynamic characterization of the TCDC empirical correlations for drop size estimation and dispersed-phase hold-up, originally developed for RDC design are applied to predict drop size and hold-up in the TCDC. Based on experimental data of the mean sauter diameter and dispersed-phase hold-up at varying rotational speeds, the design rules are adjusted for the needs of TCDC design. Thus, it is possible to predict mass-transfer area in the TCDC with given flow rates and rotational speed.
In terms of modelling mass transfer, experiments confirm complete backmixing in each compartment, best approaching apparatus design with CSTR cascade model.