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

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8.2.2 Drying Organic Compounds That Are Partially Miscible with Water

For “immiscible” systems (really partially miscible systems) of organics and water, a single phase is formed only when the water concentration is low or very high. For example, a small amount of water can dissolve in gasoline. If more water is present, two phases will form. In the case of gasoline, the water phase is detrimental to the engine, and in cold climates it can freeze in gas lines, immobilizing the car. Since the solubility of water in gasoline decreases as the temperature is reduced, it is important to have dry gasoline.

Fortunately, small amounts of water can easily be removed by distillation or adsorption (Chapter 18). During distillation the water acts as a very ...

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