The gas-phase hydrolysis of TiCl4 has been studied
with several laboratory reactors. Unexpectedly, the reaction is clearly split in two steps, an almost
instantaneous partial hydrolysis which
produces 2 mol of HCl/mol of TiCl4 together with a salt,
identified as Ti(OH)2Cl2. The
latter
forms a very fine dust which easily evolves into aerosols.
Ti(OH)2Cl2 in a moist
environment
eventually hydrolyses to HCl. The kinetics of both steps have been
studied. While the first
step is very fast, the salt hydrolysis is much slower, its kinetics
being controlled by diffusion of
the gaseous reactant through the shell of the solid product covering
the aerosol particles.
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