Fluorescence-indicated mass transfer in reactive extraction

Citation
M. Morters et Hj. Bart, Fluorescence-indicated mass transfer in reactive extraction, CHEM ENG TE, 23(4), 2000, pp. 353-359
Citations number
32
Categorie Soggetti
Chemical Engineering
Journal title
CHEMICAL ENGINEERING & TECHNOLOGY
ISSN journal
09307516 → ACNP
Volume
23
Issue
4
Year of publication
2000
Pages
353 - 359
Database
ISI
SICI code
0930-7516(200004)23:4<353:FMTIRE>2.0.ZU;2-F
Abstract
To investigate mass transfer into droplets in reactive extraction, a nonint rusive method for measuring concentration gradients using fluorescent dyes as sensors was developed. An optical probe is used to focus a laser beam in to the droplet and to detect the fluorescent light. Scanning the droplet wi th the probe leads to concentration profiles. The added dyes can either be indicators to measure gradients of ionic components in the aqueous phase or be one component of the extraction system. For the description of the syst em ZnSO4-H2SO4/di(2-ethylhexyl)phosphoric acid in isododecane, experiments have been carried out in the stagnant as well as in the flowing continuous phase. To investigate the effects of internal circulation in the droplets, further mass transfer experiments in a venturi tube have been carried out. A comparison enables both diffusion and convection inside and outside of a droplet in a reactive system to be described.