Low temperature process for producing nano-sized titanium dioxide particles
AssigneeTokusen U.S.A., Inc.
InventorsInsoo Kim, Woo Jin Lee, Young Jin Kim, Charles E. Smith, Jr.
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Abstract
A process for synthesizing nano-sized rutile, anatase, or a mixture of rutile and anatase TiO2 powder. The process includes the steps of: 1) forming a Ti-peroxo complex by mixing H2O2 with a Ti compound, and 2) heating the Ti-peroxo complex at a temperature of above 50° C. A primary particle size of TiO2 particles, synthesized by the method, is below 50 nm, and an agglomerated particle size thereof after a washing/dry process is below about 10 μm. The major characteristics of the present invention are that it is a low temperature process, a highly concentrated synthesis, and high production yield of above 90%.
Claims7
A process for producing nano-sized TiO2, consisting essentially of the steps of:
- (a) forming an aqueous Ti-peroxo complex by mixing water, H2O2 and a titanium compound selected from the group consisting of TiCl4, TiOCl2, TiCl3, TiBr4, Ti(SO4)2.mH2O, TiOSO4.nH2O, 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 H2O2 and said titanium compound are mixed with a chemical selected from the group consisting of an alkali a compound containing SO42−, NO3− or F− and a combination of the preceding to accelerate the formation of anatase TiO2;
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- (b) heating the aqueous Ti-peroxo complex at a temperature of above 50° C. to 100° C. to precipitate nano-sized TiO2 particles.
Dependencies are inferred from the claim text.