I don’t understand the reason for phase miscibility in the extraction tower.
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My understanding is: The main reason for miscibility should be that the solvent ratio is too small and the solubility is reduced. The solvent cannot dissolve too many aromatics, causing the oil and solvent to become miscible! But the reason written in the book is that the solvent ratio is too small, resulting in reduced selectivity. But doesn’t it mean that lowering the solvent ratio will affect its solubility, lower recovery rate, and higher aromatic purity? What does it have to do with selectivity? How does selectivity change when solubility is reduced?
Reduced solubility affects the distribution ratio of the two phases and ultimately affects the selectivity.