Process for the preparation of very pure titanium dioxide

Details Process for the preparation of very pure titanium dioxide Process for the preparation of very pure titanium dioxide

1994-07-29

1995-11-21

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423616, 423615, 423 82, C01G 2304, C01G 2302

Patent

active

054684633

ABSTRACT:
A process for the preparation of very pure titanium dioxide by reacting titanium tetrahalides with sulphuric acid, hydrolysis the titanyl sulphate solution obtained and calcining the hydrolysate is disclosed wherein the reaction between titanium tetrahalide and aqueous 20-40% by weight strength sulphuric acid is performed in such a way that crystallisation of titanyl sulphate does not take place, the hydrogen halide is separated, the solution is optionally concentrated and filtered and then the ratio by weight of sulphuric acid to titanium dioxide is adjusted to between 1.7 and 2.0 and the titanium dioxide concentration is adjusted to between 250 and 300 g/l, the solution is hydrolyzed and the resulting titanium oxide hydrate is filtered off and calcined to give Futile or anatase.

REFERENCES:
patent: 2167626 (1939-08-01), Alessandroni
patent: 3919388 (1975-11-01), Thompson et al.
patent: 5030439 (1991-07-01), Brownbridge
patent: 5160150 (1993-11-01), Schmidt
V. I. Belokoskov, "The TiO.sub.2 --SO.sub.3 --H.sub.2 O System at 25.degree., 50.degree. and 75.degree." Russian Journal of Inorganic Chemistry, vol. 7, No. 2, 1962, no month, pp. 192-195.
E. Takakura, "The Equilibrium of the TiO.sub.2 --SO.sub.3 --H.sub.2 O . . . H.sub.2 O", Kenkyo Hobun--Asahikawa Kogyo Koto Senmon Gako 23 (1986), no month, pp. 65-69.
Chemical Abstracts, vol. 105, 30860j, 1986, no month.

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