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Reference.org
Perstraction
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<p>Perstraction is a membrane extraction process, where two liquid phases are contacted across a membrane. The desired species in the feed (solute), selectively crosses the membrane into the extracting solution. Perstraction was originally developed to overcome the downsides of <a href="/facts/Liquid%25E2%2580%2593liquid_extraction/qVfck5T1">liquid–liquid extraction</a>, for example extractant toxicity and emulsion formation. Perstraction has been applied to many fields including fermentation, waste water treatment and alcohol-free beverage production. </p>