Using an improved expansion section as the inlet to the flue...

C - Chemistry – Metallurgy – 01 – G

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C01G 23/07 (2006.01) F28F 1/40 (2006.01)

Patent

CA 2206836

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.

Dans le procédé de production de dioxyde de titane consistant (a) à faire réagir du tétrachlorure de titane et de l'oxygène en phase vapeur dans un réacteur, afin de produire du dioxyde de titane, et (b) à refroidir ensuite le dioxyde de titane en le faisant passer dans un carneau constitué d'un carneau plastique, d'un carneau à ailettes, ou de combinaisons de ceux-ci, dans lequel la sortie du réacteur dans l'étape (a) présente un diamètre intérieur plus petit que celui de l'admission du carneau de l'étape (b), l'amélioration consiste à faire passer le dioxyde de titane dans un conduit de carneau à ailettes tronconique, l'extrémité de diamètre plus petite du conduit de carneau à ailettes tronconique recevant le dioxyde de titane produit par le réacteur, et l'extrémité de diamètre plus grande du conduit de carneau à ailettes tronconique déchargeant le dioxyde de titane reçu par ledit carneau.

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