Patent ID: 7968077

Claim:
A method for manufacturing titanium dioxide particles in a horizontal cylindrical tubular reactor having a longitudinal axis and having a downstream cooling section directly connected to said reactor, by reacting titanium tetrachloride and oxygen-bearing gas and subsequently cooling the particles in the downstream cooling section and separating the particles from the gas flow, comprising: introducing the oxygen-bearing gas into the tubular reactor in the direction of the longitudinal axis of the tubular reactor; introducing the titanium tetrachloride into the tubular reactor in a cross-sectional plane of the tubular reactor at an angle offset of more than 1° and less than 90° from a direct radial direction to the axis of the tubular reactor to generate a rotating gas stream; introducing scrub solids into the tubular reactor; whereby the rotating gas stream creates a rotational flow substantially free of backflow and that rotates the scrub solids sufficiently to reduce the amount of scrub solids required to prevent the formation of substantial deposits on the tubular reactor; and whereby the flow velocity of the oxygen-bearing gas is more than about 20 m/s.