METHOD OF PRODUCING TITANIUM DIOXIDE Russian patent published in 2013 - IPC C01G23/53 B82B1/00 B82Y99/00 

FIELD: chemistry.

SUBSTANCE: invention can be used when producing titanium dioxide based catalysts for photocatalytic treatment of water and air from organic compounds. The method of producing titanium dioxide involves feeding reactants into a reactor continuously, hydrolysis of titanium tetrachloride solution with an alkaline agent while stirring, separating residue from solution, washing, drying and calcining the residue. Titanium tetrachloride is hydrolysed with aqueous suspension of calcium hydroxide, and after hydrolysis, the fine fraction of the end product is separated from the suspension and the coarse fraction is returned into the reactor. The end product is washed after the step for calcination of titanium hydroxide with pure hydrochloric acid at pH=1-2, and the product is re-dried. The size of calcium hydroxide particles fed into the reactor for hydrolysis is not less than 3 mcm, and concentration of titanium tetrachloride is kept not more than 2%.

EFFECT: invention enables to obtain pure nanodispersed titanium dioxide.

9 cl, 1 tbl, 1 ex