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Extraction methods suitable for liquidliquid systems are described and computation methods applicable to these cases are briefly discussed.A graphical method, employing triangular coordinates, for representing equilibrium in complex oil-solvent systems is developed as a basis of computation for the solvent refining of oils. Calculated and experimental results from both multiple and countercurrent extraction processes refining different lubricating oil stocks with different lubricating oil stocks with nitrobenzene are compared, and the methods presented are shown to be sufficiently accurate for most purposes.

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