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Considerable data of a physical-chemical nature form the fundamentals upon which the development of liquid-liquid extraction processes may be based. Among these data are the solubility relations-mutual solubility and distribution coefficients-for the constituents involved. These relations cannot yet be predicted but must be obtained experimentally.The usual extraction system involves three liquid components-one pair of immiscible liquids and two pairs of miscible liquids. When the three components are present in such quantities that two liquid phases exist, the common miscible liquid distributes itself between the immiscible pi ir in accordance with the distribution law. The presence of the miscible liquid increases the solubilities

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