Process for the production of titanium dioxide, and titanium dioxide obtained thereby
AssigneeVenator Germany GmbH
InventorsJuergen Philipp Kastner, Uwe Rosin
Life of this patent
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Abstract
A particulate TiO2 includes a TiO2 content of at least 99 wt.-%, an anatase content of at least 98 wt.-%, a primary crystallite size X50 of at least 200 nm, a numerical fraction of TiO2 with a primary crystallite size of at most 100 nm of at most 10%, a specific surface area of at most 8 m2/g as determined by BET measurements, 1200 ppm to 2400 ppm of alkali with respect to the TiO2 content, an Al content of 1 ppm to 1000 ppm, expressed as Al and with respect to the TiO2 content, a weight ratio of Al2O3 to Nb2O5 of from 0.17 to 0.74, and 0.1 wt.-% to 0.3 wt.-% of P, expressed as phosphorus and with respect to the TiO2 content.
Claims14
A particulate TiO2 comprising:
- a TiO2 content of at least 99 wt.-%;
- an anatase content of at least 98 wt.-%;
- a primary crystallite size X50 of at least 200 nm;
- a numerical fraction of TiO2 with a primary crystallite size of at most 100 nm of at most 10%;
- a specific surface area of at most 8 m2/g as determined by BET measurements;
- 1200 ppm to 2400 ppm of alkali with respect to the TiO2 content;
- an Al content of 1 ppm to 1000 ppm, expressed as Al and with respect to the TiO2 content;
- a weight ratio of Al2O3 to Nb2O5 of from 0.17 to 0.74;
- and
- 0.1 wt.-% to 0.3 wt.-% of P, expressed as phosphorus and with respect to the TiO2 content.
Dependencies are inferred from the claim text.