Method of preparing titanium dioxide

Details Method of preparing titanium dioxide Method of preparing titanium dioxide

1993-05-24

1995-08-22

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423610, C01G 2304

Patent

active

054438110

ABSTRACT:
The invention relates to a method of preparing microcrystalline titanium dioxide, in which a) the solid titanium dioxide hydrate is treated with a base, b) the precipitate treated with the base is treated with hydrochloric acid, and c) the precipitate treated with the base and the hydrochloric acid is neutralized. It has been noted that useable rutile crystals, a more appropriate crystal size and crystal size distribution and that chemicals can be saved if as the final hydrochloric acid content of the stage a) is adjusted a lower value than usually, being about 8 to 25 g/liter, for the precipitation of microcrystalline titanium dioxide. Hereby the neutralization of the stage c) can also be carried out by raising the pH to a lower value than usually, i.e. the value about 4.0 to 6.0.

REFERENCES:
patent: Re31602 (1984-06-01), Makinen
patent: 2448683 (1948-09-01), Peterson
patent: 2480869 (1949-09-01), Mayer
patent: 2494492 (1950-01-01), Ross et al.
patent: 4166147 (1979-08-01), Lange et al.
patent: 4268422 (1981-05-01), Becker et al.
patent: 4605631 (1986-08-01), Rossi
Official Action for Kemura Oy, Finland dated 16 Jun. 1992.
Finnish Office Action w/English translation (901053) (no date).
EP Search Report (913011839) (no date).

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