Apparatus And Method For Crystallization

摘要

Apparatuses and methods are provided for crystallization. An apparatus includes a vessel defining an interior, a draft tube positioned in the interior of the vessel and defining an annular space between the draft tube and a side wall of the vessel, a rotor shaft extending along a central axis of the vessel, and a helical screw attached to and configured to rotate with the rotor shaft. A multi-stage apparatus further includes a stage barrier wall separating the vessel into two stages, with a draft tube and helical screw positioned in each of the stages. A method for crystallization includes supplying process material to be crystallized into a vessel, moving the process material through a central portion of the vessel, circulating a portion of the material through an annular space in the vessel, and discharging a portion of the material through an outlet.

主权项

1. An apparatus for crystallization, comprising:
a vessel having a central axis, a lower wall, and upper wall, and a side wall extending between the lower and upper wall, the vessel further defining an interior having a lower portion and an upper portion, wherein the vessel comprises an inlet for introduction of process material into the interior, and an outlet; a draft tube positioned in the interior of the vessel and extending between the lower portion and the upper portion parallel to the central axis, wherein the draft tube is spaced from the lower wall, upper wall, and side wall of the vessel, thereby defining an annular space between the draft tube and the side wall of the vessel; a rotor shaft extending along the central axis of the vessel; and a helical screw positioned in the interior of the vessel and within the draft tube, the helical screw being attached to and configured to rotate with the rotor shaft.