Abstract
Phase equilibria and critical phenomena in the ternary system potas sium formate - water - n.butoxyethanol, where a constituent binary liquid system is characterized by phase separation with a closed delamination region, were studied by means of the visual-polythermal method within 25-170°C. The temperature dependences of the com positions of the mixtures corresponding to the critical solubility points in the delamination region were determined. The distribution coeffi cients of n.butoxyethanol between the aqueous and organic phases of the monotectic equilibrium were calculated for seven temperatures. It is established that the monotectic state in the ternary system is formed as a result of crossing of the line of saturated salt solutions and the binodal curve on the potassium formate - n.butoxyethanol side of the composition triangle at 167.0°C. It is shown that the effect of salting-out of n.butoxyethanol from its aqueous solutions by potas sium formate increases with an increase of temperature. The constructed isotherms of phase states of the system have confirmed our the generalized scheme of topological transformation of the phase diagrams of ternary systems salt - binary solvent with salting-out.
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