E.i. Dupont De Nemours and Company

Raul A Gonzalez

Charles David Musick

James Nelson Tilton

A process for producing substantially anatase-free TiO.sub.2 by addition of a silicon halide in a reaction of TiCl.sub.4 and an oxygen-containing gas in a plug flow reactor is disclosed. Pigmentary properties such as gloss and CBU are enhanced without loss of durability.

Process for preparing improved TIO.sub.2 by silicon halide addition

In the process for producing titanium dioxide by (a) reacting titanium tetrachloride and oxygen in the vapor phase in a reactor to produce titanium dioxide, and (b) subsequently cooling the titanium dioxide by passing it through a flue consisting of a conventional flue, a finned flue, or combinations thereof, wherein the outlet for the reactor in step (a) has a smaller interior diameter than the inlet for the flue in step (b), the improvement comprising passing the titanium dioxide through a truncated cone-shaped finned flue conduit, the smaller diameter end of the truncated cone-shaped finned flue conduit receiving titanium dioxide produced by the reactor and the larger diameter end of the truncated cone-shaped finned flue conduit discharging titanium dioxide that is received by the flue.

Expansion section as the inlet to the flue in a titanium dioxide process

A chloride process for producing TiO.sub.2 by addition of an inert gas in a vapor phase reaction of TiCl.sub.4 and an oxygen-containing gas is disclosed.

Process for controlling agglomeration in the manufacture of TiO.sub.2

Disclosed is a process of using a bimodal distribution of scrubs in an externally cooled conduit during heat removal whereby a hot gaseous suspension containing pigmentary metal oxides is subjected to cooling. Effective heat transfer is provided. Pigmentary properties such as CBU and gloss are improved.

Use of a bimodal distribution of scrubs in a process for cooling a hot

In the process for producing titanium dioxide by

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Newark, DE, United States of America

Raul A Gonzalez