TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Products: The titanium dioxide is of rutile or anatase type with an apparent density of 1.50-1.85 g/cm3, a particle size of 10-600 nm and a specific surface area 30-250 m2/g. Preparation: Preparation of the titanium dioxide particles comprises:(1) hydrolysis of a titanium compound in presence of water, alcohol and a nonpolar dispersant to give amorphous titanium dioxide (TiO2) particles;(2) crystallizing the amorphous particles at below 450 degrees C and at 0-150 bar; and(3) separating off the particles.The alcohol used in production step (1) is of 2-9C and is selected from ethanol, 1- or 2-propanol, 1- or 2-butanol, 1-, 2- or 3-pentanol, 2-ethylhexanol, isononanol or tert. butanol.The nonpolar dispersant, optionally polymerizable, is an aliphatic hydrocarbon CnH2n+2 with n above 4, a cycloaliphatic hydrocarbon CnH2n with n above 5 and/or an aromatic hydrocarbon CnHn with n above 6, optionally with halogen or alkyl substituents.In step (1) the hydrolyzable compound is in the nonpolar dispersant prior to the start of the hydrolysis. Step (2) is effected at 5-200 degrees C and 1-100 bar with an acid catalyst, especially hydrochloric acid or an organic acid, especially formic-, acetic-, propionic-, hydroxybenzoic-, lauric- or citric-acid. Step (3) involves heat treatment to distill off volatiles.Preferred Starting Materials : The titanium compounds are of formula (I).X = Cl, Br or I;R = optionally substituted 1-9C hydrocarbon; andm = integer 0-4.Compounds (I) are selected from titanium-chloride-(-isopropylate, -tetraethoxylate or -tetrapropylate). EXAMPLE - Rutile-type titanium dioxide particles with specific surface area 37.5 m2/g and apparent density 1.74 g/cm3 were obtained by:    (1) stirring a mixture of Caldic (RTM : Isopar H) (38 ml) and titanium isopropylate (2 ml) for 10 minutes and then adding a mixture of Isopar H (20 ml), water (1 ml) and 2-propanol (19 ml) to form white amorphous TiO2 particles;    (2) stirring for a further 10 minutes and treating with hydrochloric acid; and    (3) heating the reaction vessel in an autoclave at 200 degrees C for 48 hours, prior to distilling off the 2-propanol, HCl and water to give Isopar-dispersed particles.    The corresponding values for the commercial product Bayertitan RD (RTM : TiO2) were 24 m2/g and 4.22 g/cm3, respectively.