Dekantation

Dekantation, also known as decantation, is a separation technique that involves pouring a liquid away from settled solids or immiscible liquids, leaving the sediment or heavier phase behind.

In chemistry and laboratory settings, gravity decantation relies on gravity to separate layers after sedimentation. It is simple and low-cost, but not suitable for fine suspensions. More precise methods include filtration or centrifugation.

In winemaking, dekantation serves to separate wine from sediment and to expose the liquid to air to enhance aroma and flavor. The required duration varies by wine type and age; some wines are not decanted at all.

Procedure: Allow the mixture to stand undisturbed to let sediment settle. Slowly pour the clear liquid into another container, keeping the sediment at the bottom. Stop when sediment nears the neck. For dense emulsions or fine sediments, filtration or careful decanting with a filter can be used.

Applications and limitations: Dekantation is used for wines, oils, and chemical suspensions. It can result in loss of product or exposure to air, and may fail to separate very fine particles. For emulsions or stubborn suspensions, decantation is often insufficient; alternatives include filtration or centrifugation.

Etymology: The term derives from Latin decantare, via French decanter, and in Dutch is dekantatie.