Patent ID: 7556734
Filing Date: 2009-07-07
Classification: B01D

Abstract:
1. A liquid/liquid exchange column, comprising, a) an upwardly extending exchange column casing for flooding by the reception of a relatively denser, heavier one of the liquids at, and removal of a relatively less dense, lighter one of the liquids from, an upper end, and the reception of the lighter liquid at, and the removal of the heavier liquid from, a lower end, b) a series of perforated trays partitioning the casing at different levels in the column, with adjacent trays provided with liquid openings which are positioned for a first one of said liquids to cross first sides of the trays, as a continuous phase, while a second one of said liquids permeates the trays from a second side to form globules, as a dispersed phase in the first liquid, c) for each liquid opening, a duct comprising, d) at least one depending baffle depending downwardly from each of said trays, and e) at least one upstanding baffle extending upwardly on each of said trays, and wherein, each depending baffle, upstanding baffle, and liquid retaining portion, and liquid conveying portion extending between adjacent trays, overlap vertically, and are spaced from one another, to provide, together with the duct, an undulating, first liquid flow paths between those adjacent trays.