Fluid extract

Fluid extract is a type of fluid-solid extraction, that usually employs Soxhlet Apparatus to extract certain compound with known solubility in a solvent. Some applications include extracting lipids from a plant (solid) using ethanol (liquid). In recent years this has expanded to include specialized extraction methodologies and equipment of a proprietary nature to ratio-intact extract multiple groups of compounds with discovered solubility in a solvent. This expansion has led to many successful applications such as extracting polysaccharides, resins and organic acids from a plant (solid) using glycerol (liquid). Fluid extracts are always permanent. They are concentrated.

Separation processes

Processes	Absorption Acid-base extraction Adsorption Chromatography Cross-flow filtration Crystallization Cyclonic separation Dialysis (biochemistry) Dissolved air flotation Distillation Drying Electrochromatography Electrofiltration Filtration Flocculation Froth flotation Gravity separation Leaching Liquid–liquid extraction Electroextraction Microfiltration Osmosis Precipitation (chemistry) Recrystallization Reverse osmosis Sedimentation Solid phase extraction Sublimation Ultrafiltration

Devices	API oil-water separator Belt filter Centrifuge Depth filter Electrostatic precipitator Evaporator Filter press Fractionating column Leachate Mixer-settler Protein skimmer Rotary vacuum-drum filter Scrubber Spinning cone Still Sublimation apparatus Vacuum ceramic filter

Multiphase systems	Aqueous two-phase system Azeotrope Eutectic

Concepts	Unit operation

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