| 摘要 |
<p>A novel process for the preparation of titanium dioxide comprises reacting titanium tetrachloride with oxygen at an elevated pressure and a temperature above 700 DEG C. The titanium tetrachloride is introduced into the reactor in at least two points and that portion introduced in the first inlet point is admixed with aluminium chloride and has been heated to a temperature of at least 450 DEG C by utilising the heat of reaction of aluminium and chlorine. The process provides an energy efficient method for producing titanium dioxide and avoids the need for auxiliary heating of the reactor by, for example, hydrocarbon combustion or electric discharge, which auxiliary heating can introduce impurities into the product titanium dioxide.</p> |
