Process of using an improved flue in a titanium dioxide process
AssigneeE.I. du Pont de Nemours and Company
InventorCharles David Musick
Life of this patent
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Abstract
This disclosure relates to a flue providing improved heat transfer comprising an inner layer and an outer layer, wherein the inner layer comprises a high thermal conductivity ceramic having a thermal conductivity of at least 91 W/m-K (@300K) and a Moh's hardness of at least 6.5, and comprises a plurality of protuberances 13, depressions 14 or both; and wherein the inner layer 12 and the outer layer 11 are in substantially continuous, thermally conductive contact. Titanium dioxide particles having improved particle size, gloss, undertone, tinting strength and hiding power are famed using the above described flue.
Claims25
A flue providing improved heat transfer comprising an inner layer and an outer layer, wherein the inner layer comprises a high thermal conductivity ceramic having a thermal conductivity of at least 91 W/m-K (@300K) and a Moh's hardness of at least 6.5, and comprises a plurality of protuberances, depressions or both;
- and wherein the inner layer and the outer layer are in substantially continuous, thermally conductive contact.
A process for preparing titanium dioxide particles having improved particle size distribution and/or undertone comprising:
- a. reacting titanium tetrachloride and oxygen to form titanium dioxide particles;
- and
- b. cooling said particles in a flue, wherein the flue providing improved heat transfer comprises an inner layer and an outer layer, wherein at least a portion of the inner layer comprises a high thermal conductivity ceramic having a thermal conductivity of at least 91 W/m-K (@300K) and a Moh's hardness of at least 6.5, and comprises a plurality of protuberances, depressions or both;
- and wherein the inner layer and the outer layer are in substantially continuous, thermally conductive contact.
Dependencies are inferred from the claim text.