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
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.