CONTROLLED VAPOR PHASE OXIDATION OF TITANIUM TETRACHLORIDE TO MANUFACTURE TITANIUM DIOXIDE

摘要

PROBLEM TO BE SOLVED: To provide a process for controlling the particle size and the particle size distribution of titanium dioxide in a multi-stage vapor-phase oxidation reactor.;SOLUTION: There is provided a process for controlling the formation of TiO₂ particles in a multi-stage vapor phase oxidation reactor, wherein the process includes the steps of limiting the fraction of TiCl₄ converted into TiO₂ in the reaction stream of a first or intermediate stage of the reactor under conditions that control the average residence time distribution of the reacting mass. By running the reaction in this manner, the growth of TiO₂ particles produced is so controlled that after subsequent standard finishing steps (e.g. milling) the fraction of particles having an average size of less than 0.5 μm is reduced or minimized.;COPYRIGHT: (C)2011,JPO&INPIT