Article
Article
Extraction
Article By:
Sankey, Bruce M. Research Department, Imperial Oil Limited, Petroleum Products Division, Sarnia, Ontario, Canada.
Last reviewed:July 2021
DOI:https://doi.org/10.1036/1097-8542.249100
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- Extraction, published June 2014:Download PDF
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A method of separating the constituents of a mixture using preferential solubility of one or more components in a second phase. Commonly, this added phase is a liquid, while the mixture to be separated may be either solid or liquid. For example, the preparation of tea or coffee is a process of liquid/solid extraction, whereby water selectively dissolves certain components of the mixture and leaves behind the insoluble residue (as tea leaves or coffee grounds). If the starting mixture is a liquid, then the added solvent must be immiscible or only partially miscible with the original and of such a nature that the components to be separated have different relative solubilities in the two liquid phases. See also: Solvent extraction
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