Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1992-06-05
1993-06-22
Dawson, Robert A.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210650, 210656, 2101982, 210490, 21050023, 2103232, 210506, 436161, B01D 1100, B01D 2913
Patent
active
052214770
ABSTRACT:
A reversed permeation membrane assembly and method for collecting one or more compounds of interest from a sample solution. The membrane assembly includes a semi-permeable membrane of predetermined thickness and length, and having inner and outer surfaces. The membrane is attached adjacent its outer surface to a substantially rigid membrane support, and a non-porous barrier contacts the outer surface of the membrane to prevent permeation of compounds beyond the outer surface in use. In a preferred embodiment, the semi-permeable membrane assumes a substantially tubular conformation through which sample solution may be passed. The membrane support also preferably features a tubular conformation within which the semi-permeable membrane is mounted. Because of its unique structure and improved efficiency, the assembly of the present invention may be incorporated for in-line use with liquid and gas chromatography devices and GC/MS units. In some applications, the extractant can even be flowed through the membrane cell to collect analytes and directly to an LC column for analysis in a substantially non-stop manner.
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Melcher Richard G.
O'Connor Paul J.
Dawson Robert A.
Fortuna Ana M.
Snyder Ronald J.
Stevens Timothy S.
The Dow Chemical Company
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