Patent ID: 8268203
Filing Date: 2012-09-18
Classification: C01G,C01P,Y10T

Abstract:
1. A method for producing microcrystalline titanium dioxide in the rutile form having a crystal size below 15 nm by an aqueous process, the method comprising: a) treating a titanium dioxide starting material with a base to give an alkaline pH value to obtain a first intermediate precipitate; b) adding a silicon containing compound to the first intermediate precipitate having an alkaline pH, to obtain a second intermediate precipitate, wherein the silicon containing compound is added in an amount to give a final product with a content of silicon, calculated as SiO c) treating the second intermediate precipitate with hydrochloric acid adjusted to a final concentration ranging between 15 and 65 g/l, to obtain a precipitate of rutile TiO d) neutralizing the rutile TiO