Sacling Mechanism on the Oxidation Reactor Wall in TiO_2 Synthesis with Chloride Process

The scaling mechanism on the tubular reactor wall in TiO 2 synthesis was investigated. The formation of wall scale is mostly due to the deposition and the sintering of TiO 2 particle formed in the gas phase reaction of TiCl 4 with O 2. The higher the temperature of the reactor wall is, the faster scaling rate is. At low wall temperature, the particle packed layer is formed by powder deposition, and the scale is partly sintered at higher temperature. The formation rate increases with increasing the reaction temperature and the reactant concentration, but is affected little by the surface status of the reactor.