Patent ID: 8114376

Claim:
A method for manufacturing titanium dioxide by a multistage reaction of titanium tetrachloride with oxygen in a reactor, comprising: a) introducing gaseous TiCl 4 into a preheated, oxygen-containing gaseous stream having a temperature at least about 950° C. in a first reaction zone of the reactor, where the molar ratio of TiCl 4 : O 2 in the reaction zone is greater than 1, and forming a gas suspension containing TiO 2 ; b) passing of the gas suspension containing TiO 2 and unreacted TiCl 4 into at least one further reaction zone of the reactor; and c) introducing an oxygen-containing gas at a temperature below about 50° C. and liquid TiCl 4 into the at least one further reaction zone of the reactor, where the molar ratio of TiCl 4 : O 2 added to the further reaction zone is less than 1, and further formation of TiO 2 in the gas suspension.