Reference : Extraction-column design for highly viscous systems
Scientific congresses and symposiums : Poster
Engineering, computing & technology : Chemical engineering
Extraction-column design for highly viscous systems
Quaresima, Maria Chiara mailto [Université de Liège - ULiège > Department of Chemical Engineering > PEPs - Products, Environment, and Processes >]
Pfennig, Andreas mailto [Université de Liège - ULiège > Department of Chemical Engineering > PEPs - Products, Environment, and Processes >]
from 11-07-2017 to 13-07-2017
Société Française de Génie des Procédés
[en] liquid-liquid extraction ; mass transfer ; single-drop cell
[en] The change from fossil-based feedstock to bio-based raw materials will lead to changes in the molecular structure of reagents used in the chemical industry. Bio-based raw materials are richer in oxygen, leading to intermediates and products rich in oxygen as well. This will lead to lower vapor pressure and higher viscosity of the systems. Thus liquid-based separations like solvent extraction will increase in importance. Also separation-process design needs to be adapted to properly account for higher viscosities. With drop-based simulation, extraction-column performance can be predicted to better than 10% accuracy, being time and resources saving compared to pilot-plant experiments. In previous work, appropriate models describing all drop phenomena like sedimentation and mass transfer were combined in a simulation tool, called ReDrop (REpresentative DROPs). The main idea of ReDrop is to follow the behavior of a sufficiently large number of individual drops along their path through the column and solve the population balance accounting for the interconnected phenomena mentioned. The models implemented in ReDrop have been largely validated for low-viscous systems. In order to extend the capabilities of ReDrop and describe the entire viscosity range, models have to be validated for a variety of different material system with single-drop lab-scale experiments. Sedimentation velocity and mass transfer of a single drops have been studied with a single-drop cell, where a conical glass tube is used to levitate the drop by a counter flow of continuous phase. The single-drop results are the basis for validation and extending the applicability of existing models to higher viscosity, which are then introduced into ReDrop.
PEPs: Products, Environment, and Processes
University of Liège
Extraction-column design for highly viscous systems

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