Chloride 3
Chloride 3 :
One of the two process used today for making titanium dioxide pigment. Mineral rutile, or another mineral rich in titanium, is chlorinated with coke to produce titanium tetrachloride: TiO2 + 2Cl2 + C TiCl4 + CO2 (+ CO) → This titanium tetrachloride is reacted with oxygen at approximately 1,000oC to yield titanium dioxide crystals around 0.2m in diameter, the optimum size for scattering visible light: TiCl4 + O2 + TiO2 + Cl2. The oxidation is conducted in a proprietary burner, with extra heat supplied because, although the reaction is exothermic, it is not self-sustaining. The chlorine is recycled. (Check source for accuracy of chemical formula)
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