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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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14.3 Leaching with Constant Flow Rates

Leaching, or solid-liquid extraction, is a process in which a soluble solute is removed from a solid matrix using a solvent to dissolve the solute. The most familiar examples are making coffee from ground coffee beans and tea from tea leaves. The complex mixture of chemicals that give coffee and tea their odor, taste, and physiological effects are leached from the solids by the hot water. An espresso machine just does the leaching faster into a smaller volume of water. Instant coffee and tea can be made by leaching ground coffee beans or tea leaves with hot water and then drying the liquid to produce a solid. There are many other commercial applications of leaching such as leaching soybeans to recover soybean ...

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