Nitrogen-free process for chloride-route tio_pigment...

Details Nitrogen-free process for chloride-route tio_pigment... Nitrogen-free process for chloride-route tio_pigment...

C - Chemistry, Metallurgy

01

G

23/259

C01G 23/07 (2006.01) C09C 1/36 (2006.01) C22B 34/12 (2006.01)

Patent

CA 1323977

Abstract of the Disclosure The invention is concerned with a substantially nitrogen-free process for chloride-route TiO2 pigment manufacture in which a TiO2-containing feedstock is subj- ected to a fluidized-bed, high temperature carbochlorina- tion in a chlorinator to produce TiCl4 which is thereafter converted to TiO2 by oxidation. The TiO2-containing feed- stock and a solid carbonaceous reducing agent are fed to the chlorinator under a CO2 blanketing atmosphere such that the carbochlorination is carried out in a substantially nitrogen-free atmosphere containing CO2 and a CO2-rich flue gas is generated, the CO2 in the chlorinator assisting in controlling thermal balance of the carbochlorination reaction. The absence of significant concentrations of nitrogen in the flue gas results in a favorable condition enabling either or both the CO and CO2 contained in the flue gas to be readily recovered, purified and sold as by-products.

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