METHOD OF PRODUCING TITANIUM DIOXIDE Russian patent published in 2011 - IPC C01G23/47 

FIELD: chemistry.

SUBSTANCE: invention relates to production of titanium dioxide used in making photoactive catalysts, organosilicon and Thiokol sealants. Ammonium and titanyl sulphate are preheated to temperature 650-850°C at a rate of 3-10 deg/min in the presence of a zinc compound and then thermally treated at that temperature for 0.2-5.5 hours. The zinc compound used is zinc carbonate or zinc nitrate, taken in amount of 0.05-0.25 wt % in terms of ZnO relative the content of TiO₂ in ammonium and titanyl sulphate. The gas phase which contains volatile ammonium and sulphur compounds is trapped with dilute ammonium solution to obtain ammonium sulphate.

EFFECT: invention enables to increase the specific surface area of titanium dioxide powder with anatase structure to 70 m²/g and lowers bulk weight to 350 g/dm³, lowers temperature of the process, increases efficiency of using the starting material.

2 cl, 4 ex