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AssigneeKerr-McGee Chemical Corporation
InventorsJohn C. Magyar, Alan J. Morris, Glenn D. Wootten, William A. Yuill
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A process for reacting titanium tetrachloride vapors with oxygen to produce titanium dioxide wherein the oxygen is introduced into the reactor in at least two points. The process has the ability to control properties, such as particle size, of the raw pigment produced. The temperature of the oxygen introduced to the reactor at the further inlet point is above, below, or at the same temperature of the oxygen introduced at the first inlet point. The further inlet point can be located before or after the all the titanium tetrachloride has been introduced into the reactor. The titanium tetrachloride is introduced at a relatively low temperature, below about 427° C., and the reaction temperature in the reactor is at least about 700° C. The process includes the use of an auxilary fuel such as carbon monoxide, methane, propane, butane, pentane, hexane, benzene, xylene, toluene, or combinations thereof for increasing the temperature in the reactor. Still further, the process for producing titanium dioxide provides for the addition of aluminum chloride to the reactor. Advantageously, the process allows the pressure in the reactor to be above atmospheric pressure and range between about 0.15 MPa and 4.0 MPa above atmospheric pressure during the production of titanium dioxide. A reactor is also provided with an aluminum chloride generator for heating the titanium tetrachloride and delivering aluminum chloride to the reactor.
A process for the production of titanium dioxide comprising reacting titanium tetrachloride with oxygen at atmospheric pressure or above and at a reaction temperature of at least about 700° C. in an oxidation reactor having a first reaction zone and a second reaction zone spaced a distance from the first reaction zone, the oxygen being introduced into the reactor at a first inlet point in the first reaction zone before any titanium tetrachloride is introduced and into at least one further inlet point in the second reaction zone, the titanium tetrachloride introduced into the reactor being heated to a temperature of less than about 427° C. prior to introduction, and controlling the titanium tetrachloride to oxygen ratio in the first reaction zone to thereby control the particle size of the produced titanium dioxide.
A process for the production of titanium dioxide in an oxidation reactor having a first reaction zone and a second reaction zone spaced a distance from the first reaction zone, the process comprising:
Dependencies are inferred from the claim text.