Venator Germany Gmbh

Uwe Rosin

Juergen Philipp Kastner

Jürgen Philipp Kastner

A process for producing a particulate TiOincludes supplementing metatitanic acid with an alkali compound in a quantity of 1200 ppm to 2400 ppm of alkali, with a phosphorus compound in a quantity of 0.1 wt.-% to 0.3 wt.-% by weight of P, expressed as phosphorus, and with an aluminum compound in a quantity of 1 ppm to 1000 ppm of Al, expressed as Al, to obtain a mixture. The quantity of the alkali compound, of the phosphorus compound, and of the aluminum compound are with respect to the TiOcontent. The mixture is calcined at a constant temperature of 940&#xb0; C. to 1020&#xb0; C. until a numerical fraction Xof TiOhas a primary crystallite size of at least 200 nm, to obtain a calcined mixture. The calcined mixture is cooled to obtain a cooled calcined mixture. The cooled calcined mixture is grinded to obtain the particulate TiO.

Process for the production of titanium dioxide, and titanium dioxide obtained thereby

A particulate TiOincludes a TiOcontent of at least 99 wt.-%, an anatase content of at least 98 wt.-%, a primary crystallite size Xof at least 200 nm, a numerical fraction of TiOwith a primary crystallite size of at most 100 nm of at most 10%, a specific surface area of at most 8 m/g as determined by BET measurements, 1200 ppm to 2400 ppm of alkali with respect to the TiOcontent, an Al content of 1 ppm to 1000 ppm, expressed as Al and with respect to the TiOcontent, a weight ratio of AlOto NbOof from 0.17 to 0.74, and 0.1 wt.-% to 0.3 wt.-% of P, expressed as phosphorus and with respect to the TiOcontent.

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Kamp-Lintfort, Germany

Uwe Rosin