Experimental measurements and thermodynamic modeling ofwax disappearance temperature for the binary systems n-C14H30 + n-C16H34, n-C16H34 + n-C18H38 and n-C11H24 + n-C18H38

• The wax disappearance temperatures (WDT) of three binary systems including n- tetradecane + n-hexadecane, n-hexadecane + n-octadecane and n-undecane + n-octadecane as a function of temperature have been investigated experimentally.
• The WDTs of pure n-hexadecane and the system n-tetradecane + n-hexadecane have been compared with available experimental data reported in literature to verify the measurements.
• Different combinations of: ideal solution behavior, regular solution theory, predictive Wilson, predictive UNIQUAC and UNIFAC, have been used to describe the solid–liquid equilibria of the studied binary systems.
• Based on these different combinations, the most accurate model, without using any adjustable parameter, has been determined.

The current work investigates the wax disappearance temperature (WDT) of three binary systems including n-tetradecane + n-hexadecane, n-hexadecane + n-octadecane and n-undecane + n-octadecane as a function of temperature at local atmospheric pressure. Verifying the uncertainties of the measurements, the WDT of pure n-hexadecane and the system n-tetradecane + n-hexadecane are compared with available experimental data reported in literature. Good agreement between the measured experimental data in the present study and those reported previously in literature is observed. Finally, by modeling the paraffin systems with different combinations of ideal solution behavior, regular solution theory, predictive Wilson, predictive UNIQUAC and UNIFAC, the solid–liquid equilibria of the binary systems were described to find the most accurate model without using any adjustable parameter.