Excess molar internal pressures and changes in refractive indices of acetone + methanol + (2-methyl-1-propanol or 3-methyl-1-butanol) at 298.15 K

Abstract

This study aims at extending the characterisation by refractive index of ternary systems containing potential separation agents for extractive distillation of minimum azeotropes. The systems considered are acetone + methanol + (2-methyl-1-propanol or 3-methyl-1-butanol), which have been studied at 298.15 K and atmospheric pressure for the whole composition diagram. Parameters of polynomial equations, which represent the molar fraction dependence of the refractive index and derived property, are gathered. Based on the variations of the derived values with composition, conclusions about the molecular interactions and their dependence on branched alcohol structure were drawn.

Keywords:

• Refractive index
• Ternary systems
• Molecular interactions