Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1991-01-29
1992-03-24
Dawson, Robert A.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210177, 2101952, 210295, B01D 6100
Patent
active
050985752
ABSTRACT:
A method and apparatus for reducing the concentration of a first substance in a first liquid by: (a) subjecting the first liquid to natural osmosis, via a first semipermeable body, with respect to an intermediate liquid, which intermediate liquid is a solution or suspension of a second substance in a second liquid, the second liquid being the same as the first liquid and passing through the first semipermeable body, the second substance being of larger molecular size than the first substance and not passing through the first semipermeable body, whereby the quantity of the second liquid in the intermediate liquid is increased; and then (b) subjecting the intermediate liquid to reverse osmosis under pressure via a second semipermeable body to pass therethrough the second liquid.
REFERENCES:
patent: Re32144 (1986-05-01), Keefer
patent: 3206397 (1962-09-01), Harvey
patent: 3702820 (1970-03-01), Hough
patent: 3906250 (1975-09-01), Loeb
patent: 4156645 (1979-05-01), Bray
R. G. Rosehart, "Mine Water Purification by Reverse Osmosis", The Canadian Journal of Chemical Engineering, vol. 51, (12, 1973), No. 6.
Barish Benjamin J.
Dawson Robert A.
Fortuna Ana
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