Physical Properties of Ternary System Acetic acid-Water-Butyl acetate

Abstract

Physical properties of ternary system acetic acid-water-butyl acetate were determined experimentally. Solubility and tie-line equilibria, density and refractive index on the biaodal curve and iso-refractive index line in the homogeneous region were observed at 30°C. Solubility and tie-line equilibria at boiling point were measured by the new method whose principle is based on the fact that there is a sharp change in temperature drop when adding the third component to the original boiling binary system.
Several tie-line correlations were examined and it was concluded that the linear correlation represented by one straight line gives errors in smoothing equilibrium data especially for the region of smaller solute concentration. Plait point at 33°C was determined by Hands' method and found to be that the weight percent of acetic acid, water and butyl acetate are 38.23, 25.53 and 33.24 respectively. Middle points of tie-line on the refractive index or density concentration diagram at 30°C lies on the straight line which connects the plait point and the middle point of the binary conjugate line. In other words, it may be said that the law of rectilinear diameter exists in the correlation of tie-line concerned with refractive index or density.