Patent ID: 6387347
Filing Date: 2002-05-14
Classification: C01G,C01P

Abstract:
A process for producing titanium dioxide in a multi-stage gas phase reactor, the process comprising the steps of:(a) reacting in a first stage of the multi-stage gas phase reactor a fraction of a first gaseous mixture comprising titanium tetrachloride with an oxygen-containing gas to form a reaction mixture comprising titanium tetrachloride, titanium dioxide, chlorine and oxygen, the reaction being effected under conditions such that the reaction mixture has a mean residence time in the first stage which limits growth of titanium dioxide particles produced, wherein the fraction of the titanium tetrachloride of the first gaseous mixture reacting in the first stage of the reactor is not greater than about 70 percent; and (b) reacting in a subsequent stage of the reactor a second or subsequent gaseous mixture comprising titanium tetrachloride with the reaction mixture from the first stage.