REFRACTIVE-INDEXES, DENSITIES AND EXCESS PROPERTIES ON MIXING OF THE SYSTEMS ACETONE PLUS METHANOL PLUS WATER AND ACETONE PLUS METHANOL PLUS 1-BUTANOL AT 298.15 K

Refractive indices and densities of acetone + methanol + water, aceton e + methanol + 1-butanol and of the binary mixtures acetone + water, a cetone + 1-butanol, methanol + water, and methanol + 1-butanol have be en determined experimentally over the entire range of composition at t he temperature 298.15 K and at atmospheric pressure. Derived excess pr operties were determined, variable-degree polynomials being fitted to the results. Methods for predicting ternary excess properties from the values of the corresponding three binary mixtures involved are tested and compared. An estimation of excess volumes is also evaluated using a modified Heller equation (Heller, 1965) which depends on the refrac tive indices of the mixture. Comparison of the predictions by differen t methods with the experimental values of the physical properties is m ade.