Liquid-liquid mixer
AssigneeImi Tami Institute for Research and Development Ltd.
InventorsJoseph Mizrahi, Eli Barnea
Life of this patent
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Abstract
A liquid-liquid mixer wherein each impeller is associated with one recirculation chamber or two such chambers, having substantially the same diameter as the impeller. Each such recirculation chamber has the effect of increasing significantly the number of dispersion-recoalescence cycles for a given residence time and in consequence it is possible to employ an impeller of a selectively large diameter -- 50-90% of the diameter of the vessel portion in which it is located -- and to operate at relatively low speeds of revolution.
Claims20
A liquid-liquid mixer comprising a cylindrical vessel with a vertical axis and at least one impeller within the vessel keyed on a coaxial vertical shaft connected to external driving means for imparting to the impeller a rotational movement, the diameter of the impeller being from about 50% to about 90% of that of the vessel, and associated with each impeller in spaced relationship thereto at least one coaxial recirculation chamber of a diameter which is essentially the same as that of the impeller and comprising two spaced circular plates of which the one closest to the associated impeller has a diameter substantially the same as the impeller and comprises a central hole, which plates are interconnected by a plurality of partitions extending from within in direction of the periphery, whereby a liquid-liquid dispersion arriving from the shearing zone of an impeller and flowing away from the periphery of the mixer is conducted into an associated recirculation chamber and from there back into the shearing zone.
A liquid-liquid mixer comprising a cylindrical vessel with a vertical axis and a single impeller located in the bottom region of the vessel and having a bottom plate with a plurality of upright blades connected thereto, the impeller being accessible to liquid flow from above, a single recirculation chamber provided above the impeller having a diameter substantially the same as that of the impeller and mounted around tubular vertical passageway for the freshly fed-in phases, an annular horizontal partition for separating between the peripheral region of the impeller and recirculation chamber, means located above the recirculation chamber for the continuous feeding of the liquid phases to be mixed into said tubular passageway, and means for the continuous withdrawal of the mixed phases from the impeller region, a coaxial vertical shaft connected to external driving means and keyed to the impeller for imparting to the impeller a rotational movement, the diameter of the impeller being from about 50% to about 90% of that of the vessel.
Dependencies are inferred from the claim text.