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 1050238
ABSTRACT OF THE DISCLOSURE The present invention provides, in a method of the type which involves (a) the heating of a flow of carrier gas and the vaporizing thereinto of a chemically different liquid to be carried thereby and (b) the subsequent cooling of such flow and condensation of such liquid therefrom after the same has been (c) subjected to treatment, the improvement that: (d) said heating and vaporizing step (a) is effected in a first zone, (e) said cooling and condensing step (b) is effected in a third zone from which said gas flow and liquid condensate are removed, (f) said treatment step (c) is effected in a second zone in which the flow is further heated and has a further quantity of vapor of said liquid added thereto, (g) said flow is passed in sequence through said first, second and third zones, (h) an amount of said liquid containing a concentration of less volatile substance dissolved in solution therein is brought into physical contact with said flow of gas in said first zone, said amount comprising a first quantity of said liquid that is vaporized into said carrier gas in said first zone and a second quantity of said liquid which is not so vaporized, whereby said dissolved substance forms in said second quantity of liquid a more concentrated solution in said first zone, (i) heat for effecting the heating and vaporizing in said first zone is obtained from the cooling and condensation in said third zone and such heat is transferred to the flow in said first zone from the flow in said third zone by way of a countercurrent indirect contact heat exchange while maintaining said flows out of contact with each other, (j) said second quantity of liquid solution is withdrawn from said first zone, and (k) a portion of said withdrawn second quantity of liquid solution is recycled to comprise a part of said amount of liquid brought into said physical contact in step (h).
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