MODELING OF A CONTINUOUS REACTOR FOR TIO2 POWDER SYNTHESIS IN A SUPERCRITICAL-FLUID - EXPERIMENTAL VALIDATION

Citation
Vg. Courtecuisse et al., MODELING OF A CONTINUOUS REACTOR FOR TIO2 POWDER SYNTHESIS IN A SUPERCRITICAL-FLUID - EXPERIMENTAL VALIDATION, The Journal of supercritical fluids, 9(4), 1996, pp. 222-226
Citations number
10
Categorie Soggetti
Chemistry Physical","Engineering, Chemical
ISSN journal
08968446
Volume
9
Issue
4
Year of publication
1996
Pages
222 - 226
Database
ISI
SICI code
0896-8446(1996)9:4<222:MOACRF>2.0.ZU;2-0
Abstract
The use of supercritical fluids as a reaction medium for the synthesis of metal oxide powders allows many advantages. The powders obtained a re dry, fine, and crystallized. TiO2 production, from decomposition of Ti(OC3H7)(4) used as a precursor, has been developed in a continuous reactor at a laboratory scale. The present work is concerned with the modeling of such a reactor, based on experimental studies including (1 ) a kinetic study of the Ti(OC3H7)(4) decomposition in supercritical a lcohol and (2) an hydrodynamic study. The first one allows us to defin e the experimental working conditions for the continuous system produc ing TiO2 powder. The second one shows the existence of a hotter zone a t the reactor inlet leading to a nonisothermal operation inside the re actor. These two investigations show that temperature and pressure val ues in the investigated range appear to have no significant influence on the primary particle size (around 30 nm) obtained.