Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1986-05-02
1987-08-25
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210656, 210336, B01D 1300
Patent
active
046891528
ABSTRACT:
The invention relates to an apparatus and process for the separation of at least a portion of one liquid phase from a mixture of immiscible liquid phases using two porous membranes spaced from one another. Each membrane is wetted only by the one liquid phase to be separated. The mixed phases are pressurized on one side of the first membrane. The one phase to be separated passes through the first membrane into the space between the membranes and then through the second membrane to form a finished stream. Any phase that does not ideally wet the first or second membranes theoretically does not pass through the membranes. However, any such phase that nevertheless does pass through the first membrane, due to operational variations or membrane aging effects, is removed from a space between the membranes and does not effectively contaminate the finished stream.
REFERENCES:
patent: 3170867 (1965-02-01), Loeb et al.
patent: 4218312 (1980-08-01), Perry
patent: 4350594 (1982-09-01), Kawai et al.
patent: 4431545 (1984-02-01), Pall et al.
Nord et al., Extraction Based on the Flow-Injection Principle; Analytica Chimica Acta, 118 (1980) pp. 285-292.
Moore, W. J., Physical Chemistry, 3rd ed., 1964, Prentice Hall, p. 730.
Hwang et al., Membranes in Separations, 1984, Krieger Publishing Co., pp. 325-334.
Fossey et al., Simultaneous Monitoring of Both Phases in the Solvent Extraction/Flow Injection Analysis of Dramamine Tablets, 1983, pp. 1882-1885.
Halldorson Burke M.
Spear Frank
Stevens Timothy S.
The Dow Chemical Company
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