Abstract
Phase equilibria and critical phenomena in cut 3 of the quaternary system water - pyridine - butyric acid - potassium chloride whose constituent ternary liquid system had a closed binodal curve were studied by means of the visual-polythermal method within 5-90°C. We have determined the temperature dependence of the solution composition corresponding to the critical solution point of the immis- cibility region. Phase state isotherms constructed on the triangle of the cut for twelve temperatures have allowed topological transforma tion of the phase diagram for the examined cut of the composition tetrahedron of the system with temperature changes to be revealed.
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