Process for reducing carbon monoxide and carbonyl sulfide emissions from a fluidized bed titanium dioxide chlorinator
AssigneeE. I. Du Pont de Nemours and Company
InventorsPaul G. Reis, Melvyn B. Pell, David N. Low, Hans H. Glaeser
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Abstract
In a process for chlorinating titanium containing material in a fluidized bed reactor which evolves gaseous material including CO, COS, and TiCl.sub.4, the improvement comprising introducing oxygen containing gas at a location or locations which are downstream of the surface of the bed, as measured in its static condition, to convert at least some CO to CO.sub.2 and some COS to CO.sub.2 and SO.sub.2.
Claims15
In a process for producing TiO.sub.2 comprising chlorinating titanium containing material in a fluidized bed reactor which evolves gaseous material including CO, COS, TiCl.sub.4, and iron chloride wherein at least 50 percent by volume of the iron chloride is ferrous chloride, and other metal chlorides, which are withdrawn through one or more flues;
- subsequently separating the TiCl.sub.4 from the metal chlorides;
- and then oxidizing the separated TiCl.sub.4 to form TiO.sub.2, the improvement comprising introducing oxygen containing gas into at least one location which is downstream of the surface of the fluidized bed, as measured in its static condition, said oxygen containing gas being introduced in an amount to convert at least some of the COS and CO to CO2 and SO.sub.2 which reduces CO and COS emissions.
The process of any one 1-10 wherein the improvement further comprises an oxygen containing gas that exits a process to oxidize TiCl.sub.4 to TiO.sub.2 containing chlorine in the amount of at least about 50 percent by volume and containing oxygen in the amount of about 0.1-25 percent by volume.
Dependencies are inferred from the claim text.