B - Operations – Transporting – 01 – F
Patent
B - Operations, Transporting
01
F
B01F 7/22 (2006.01) B01F 3/04 (2006.01) B01J 10/00 (2006.01) B01J 19/00 (2006.01) B01J 19/18 (2006.01)
Patent
CA 2155371
Improved mixing effectiveness in the mixing of a gas with a liquid suspension is achieved in a batch mixing system having a mixing tank with a hemi-toroidal tank bottom which extends between a radially inner neck portion of the tank to a radially outer cylindrical wall portion of the tank. The hemi-toroidal profile of the tank bottom has a monotonically increasing toroidal radius between the neck and wall portions. Disposed within the tank is an assembly including an axial flow impeller with pitched impeller blades, a stator adjacent to the impeller and having stationary stator blades of a pitch opposite to the pitch of the impeller blades, a shroud surrounding the radial periphery of both the impeller and the stator and a gas sparging means supported by the shroud. The arrangement of the assembly provides in conjunction with the hemi-toroidal tank bottom a substantially swirl-free laminar flow of the liquid suspension directed downwardly along the neck portion and along the tank bottom when the impeller is rotatably driven by a drive shaft.
Borden Ladner Gervais Llp
Lessen Martin
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