Abstract: An apparatus and process for classifying fine particles from a particulate material, such as toner and pigment powders. The apparatus is generally a dynamic centrifugal gas (air) classifier that combines the operational advantages of centrifugal air classifiers with increased aerodynamic forces provided by a rotating member to classify powders at cutpoints of fifteen micrometers and finer. The classifier is configured to have an annular-shaped inner passage, an annular-shaped outer passage circumscribing the inner passage, and an inlet through which a gas-entrained particulate material is introduced substantially tangentially into the inner passage so as to impart a centrifugal force to the particulate material. A portion of the entraining gas is preferably separated and directed into the outer passage.

Abstract: A hanger system particularly for cyclone collectors in a fluidized particle process vessel, such as a fluid catalytic cracker regenerator vessel, wherein a vertical supporting member is pinned at one end to a cyclone wall lug and at the other through a slot in a vessel depending lug so that thermal and mechanical stresses within the overall assembly are compensated for by sliding movement of the pin in the slot, which movement is controlled by a stabilizing linkage member attached to the pin at one end and pivotably attached at the other end to the vessel.