Abstract
Phase equilibria and critical phenomena in cut 1 of the quaternary system water – pyridine – butyric acid – potassium iodide whose constituent ternary liquid system had a closed binodal curve were studied by means of the visual-polythermal method within 5–60°C. We have determined the temperature dependence of the solution composition corresponding to the critical solution point of the immiscibility region. Phase state isotherms constructed on the triangle of the cut for eight temperatures have allowed topological transformation of the phase diagram for the examined cut of the composition tetrahedron with temperature changes to be revealed. It is revealed that, at small concentration potassium iodide possesses salting-in action in water-organic solutions and, at increased concentration it shows salting-out. For four-component systems it was established for the first time.
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