Patent ID: 8557217

Claim:
A process for producing nano-sized TiO 2 , consisting essentially of the steps of: (a) forming an aqueous Ti-peroxo complex by mixing water, H 2 O 2 and a titanium compound selected from the group consisting of TiCl 4 , TiOCl 2 , TiCl 3 , TiBr 4 , Ti(SO 4 ) 2 .mH 2 O, TiOSO 4 .nH 2 O, Tetra Methoxy Titanium, Tetra Ethoxy Titanium, Tetra-n-Propoxy Titanium, Tetra Iso Propoxy Titanium, Tetra-n-Butoxy Titanium, Tetra Iso Butoxy Titanium, Tetra-Sec-Butoxy Titanium, Tetra-T-Butoxy Titanium, Tetra Alkoxy Titanium, and Tetra Stearyl Oxy Titanium and a combination of the preceding, wherein said H 2 O 2 and said titanium compound are mixed with a chemical selected from the group consisting of an alkali a compound containing SO 4 2− , NO 3 − or F − and a combination of the preceding to accelerate the formation of anatase TiO 2 ; and (b) heating the aqueous Ti-peroxo complex at a temperature of above 50° C. to 100° C. to precipitate nano-sized TiO 2 particles.