A process for the use of a tube in a method for producing titanium dioxide.

摘要

In the process for producing titanium dioxide byP P(a) reacting titanium tetrachloride and oxygen in the vapor phase to produce titanium dioxide, andPP(b) subsequently cooling the titanium dioxide in a flue,PPan improvement comprising utilizing for all or a portion of the flue a conduit having a plurality of internal, substantially longitudinal protuberances, depressions or both.