USING AN IMPROVED EXPANSION SECTION AS THE INLET TO THE FLUEIN A TITANIUM DIOXIDE PROCESS

摘要

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 coneshaped finned flue conduit, the smaller diameter end of the truncated coneshaped 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.