Suppression of the formation of noxious substances during chloride processes
AssigneeMillennium Inorganic Chemicals, Inc.
InventorsThomas Messer, Peter Carter
Life of this patent
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Abstract
The present invention is directed to the suppression of the formation noxious compounds such as furans. According to the present invention, a venturi device is used to rapidly quench a chlorinator reaction gas. The rapid quench minimizes the resonance time that furan precursors are at conditions conducive to furan formation.
Claims17
An apparatus for suppressing the formation of noxious compounds, said apparatus being comprised of:
- (a) a chlorinator, wherein said chlorinator is comprised of an outlet duct;
- and
- (b) a nozzle located within said outlet duct, wherein said nozzle is comprised of a converging section and a diverging section.
A process for suppressing the formation of noxious compounds produced during TiO2 production, said process comprising:
- (a) permitting a chlorinator reaction gas to enter a nozzle, wherein said nozzle is comprised of a converging section and a diverging section;
- (b) permitting said chlorinator reaction gas to pass from said converging section of said nozzle to said diverging section of said nozzle;
- (c) introducing a temperature reducing substance into said nozzle thereby cooling said gas to form a mixture comprised of solids and a gas;
- and
- (d) separating said solids from said gas.
A process for suppressing the formation of furans during titanium dioxide production, said method comprising:
- (a) permitting a chlorinator reaction gas to enter a converging section of a venturi device, wherein said chlorinator reaction gas is at a temperature between 700° C. and 1100° C. when entering said converging section and is comprised of titanium tetrachloride;
- (b) permitting said gas to pass to a diverging section of said venturi device;
- (c) introducing liquid titanium tetrachloride into said venturi device thereby cooling said chlorinator reaction gas to a temperature between 240° C. and 280° C. to form a mixture comprised of solids and a gas;
- and
- (d) cycloning said mixture.
Dependencies are inferred from the claim text.