Positive focusing in a magnetically stabilized fluidized bed

Details Positive focusing in a magnetically stabilized fluidized bed Positive focusing in a magnetically stabilized fluidized bed

1991-03-11

1992-01-28

Dawson, Robert A.

Liquid purification or separation

Processes

Chromatography

55 3, 55 18, 55 19, 55 20, 55 67, 55100, 55386, 55390, 2101982, 210222, 210661, 210695, B01D 1508

Patent

active

050841840

ABSTRACT:
A process of positive focusing of a component of a feedstream in a magnetically stabilized fluidized bed which comprises: (a) providing in a column a bed of magnetizable adsorbent solids for which the component has an affinity, the bed descending countercurrently to an ascending flow through the bed of a fluidizing medium which enters the column at a fluidizing medium entry point, and the bed being stabilized by a magnetic means of sufficient strength to suppress solids backmixing and to preserve staging therein; (b) introducing the feedstream into the column through at least one feedpoint which is spaced above the fluidizing medium entry point, the feedstream and the fluidizing medium together comprising a fluid phase within the column; and (c) adjusting conditions such that they are effective to result in concentration of the component within at least one positive focusing zone in the column wherein above the zone the velocity of the component is less than zero and below the zone the velocity of the component is greater than zero. The velocity of the desired component is controlled by adjusting conditions of the fluid phase above and below the positive focusing zone, e.g., temperature, salt concentration, pH and/or organic concentration.

REFERENCES:
patent: 4283204 (1981-08-01), Savage
patent: 4668379 (1987-05-01), Rosenweig et al.
patent: 4780113 (1988-10-01), Koslow
Dr. Mark Burns' Thesis Entitled, "Continuous Affinity Chromatography Using a Magnetically Stabilized Fluidized Bed", 1986, University Microfilms Inc., Ann Arbor, Michigan.

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