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Dupont patents PROCESS FOR PRODUCING TITANIUM DIOXIDE

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 7,476,378 B2
E.I. DuPont deNemours & Co. has obtained a patent for a process for producing titanium dioxide comprised of providing a quantity of liquid titanium tetrahalide for reacting with an oxygen-containing gas; vaporizing a first portion of the liquid titanium tetrahalide and reacting the titanium tetrahalide vapor and the oxygen-containing gas, in a first stage of a reaction zone, the reaction zone temperature being sufficient to form a reaction product at least containing titanium dioxide and oxygen-containing gas and passing the reaction product to at least one additional stage of the reaction zone; and charging at least one additional portion of the liquid titanium tetrahalide directly into the at least one additional stage of the reaction zone at a temperature below the boiling point of the titanium tetrahalide, at the charge pressure of the titanium tetrahalide, to cool the titanium dioxide and to react with the oxygen-containing gas to form additional titanium dioxide, under conditions sufficient to form a product substantially free of titanium tetrahalide. 

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