“…As the separation of carboxylic acids from aqueous solutions resulting from fermentation processes or synthetic methods is industrially and scientifically important, the precise LLE data are needed and required in design of many chemical processes, separation operations, and fermentation industry. Many researchers have investigated various kinds of the multi-component systems in order to understand and provide further information about the phase behaviour and the thermodynamic properties of such systems (Ghanadzadeh Gilani, & Golpour, 2011). Formic acid is one of the most widely used carboxylic acids, which has many industrial applications.…”