Improved Method for producing Titanium dioxide from Titanium TETRACHLORIDE in the presence of Aluminum TRICHLORIDE and Phosphorus

摘要

It is known to produce rutile titanium dioxide by oxidising TiCl4 in the presence of AlCl3 and PCl3. The AlCl3, used normally in an amount such as to provide from 2% to 4% by weight Al2O3 in the product, is essential in order to produce the rutile structure but is of disadvantage in that it leads to corrosion of metallic reactor surfaces. The invention reduces the amount of AlCl3 necessary to provide the rutile structure, and thereby enables this disadvantage to be minimized, by introducing the PCl3 after the AlCl3 and when the TiCl4 conversion has reached 80% by weight or more.