Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1995-03-01
1997-06-17
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
21050027, 21050036, B01D 6136
Patent
active
056393750
ABSTRACT:
Disclosed is a method for concentrating by 20 to 10,000 fold a semivolatile or essentially nonvolatile organic compound, such as a herbicide or pesticide, from a contaminated aqueous solution into a carrier fluid for simultaneous or subsequent analysis. A perstraction membrane is contacted on one surface with a large volume of an aqueous feedstream containing a low concentration of an organic compound, and an opposite surface of the same membrane is contacted with a small volume of a carrier fluid. The perstraction membrane is characterized by a nonporous layer therein which precludes convective flow and mixing between the aqueous and carrier fluid phases. The organic compound is absorbed into the nonporous skin layer from the aqueous fluid and is transferred from the nonporous skin layer into the carrier fluid by an affinity driving force, the affinity of the carrier fluid for the organic compound being greater than the affinity of water for the same compound. The carrier fluid containing the organic compound in concentrated form is passed through a flow cell of an analytical instrument for detection and analysis, or is presented to a sampling port of an analytical instrument, or is otherwise sampled for analysis in a subsequent operation.
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NeoMecs Incorporated
Petersen Robert J.
Spear Frank
LandOfFree
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