Peculiar points in the phase diagram of the water-alcohol solutions

Abstract

The work is devoted to the investigation of nontrivial behavior of dilute water-alcohol solutions. The temperature and concentration dependencies of the contraction for aqueous solutions of ethanol and methanol are analyzed. The existence of a specific point, the so-called peculiar point, was established. It is shown that water- alcohol solutions of different types obey the principle of corresponding states if temperature and volume fraction are used as principal coordinates. In this case, the concentration of the peculiar point for different solutions is close to xγ = 0.28. Several predictions are made. © V.E. Chechko, V.Ya. Gotsulsky, M.P. Malomuzh, 2013.