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Salt effecting extraction refers to adding salt into the organic aqueous constant-boiling solution, and with the salt-solvent interactions the Liquid-Liquid Equilibria (LLE) in the solution will be changed, which means a variation of the distribution coefficient between solvents and lead to the separation.
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When potassium carbonate is added into the cyclohexanone-water system, a cyclohexanone-water- potassium carbonate system can be found in the solution. Because the potassium carbonate-water interaction far surpasses the cyclohexanone-water interaction, when the cyclohexanone-water- potassium carbonate system reaches a state of equilibrium, there will be little water and trace amount of potassium carbonate left in the organic phase and trace amount of cyclohexanone in the salt-water phase, which provides an energy-saving separation technology for   the cyclohexanone-water azeotrope.

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