B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
165/1, 23/285, 2
B01D 59/33 (2006.01) C01B 4/00 (2006.01)
Patent
CA 1049751
ABSTRACT OF THE DISCLOSURE The present invention provides in a method for producing a fluid containing a first material concentrated therein by exchan- ging at two different temperatures said first material with a second material between chemically different first and second fluid phases which are physically separable from each other and which are each capable of containing each of said materials, said method being of the type in which (a) said second fluid phase is passed through each of the second and first units, in that order, of a pair of exchange units, and in which (b) flows of said first fluid phase are passed in countercurrent contact with said second fluid phase in said first and second units or said pair, (c) said first and second units being maintained at different temperatures to cause said second fluid phase to become enriched in said first material in passing through said second unit and to become impoverished in said first material in passing through said first unit of said pair, and to cause the first fluid phase to become enriched in said first material in passing through said first unit and to become impoverished in said first material in passing through said second unit of said pair of units, and in which a part of at least one of the enriched fluids passing between said units is withdrawn; the improvement which comprises, (d) delivering a flow of said first fluid phase containing said materials from a source thereof and passing said flow in countercurrent exchange with said enriched second fluid in a delivery-to-discharge path passing through at least a portion of said first unit and at least in part through the full extent of said second unit, and (e) returning at least a portion of said flow of first fluid phase which has passed through the full extent of said second unit to recirculate the countercurrent contact with said second fluid phase throughout the entire extent of said first unit.
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