Experimental Investigation and Thermodynamic Modeling of Equilibria in the Quinary System Naphtha Cut, Sulfolane, and Water

Document Type : Research paper

Authors

1 Department of Chemical Engineering, Uinversity of Qom, Qom, Iran

2 Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

3 Chemical Eng. Faculty

Abstract

Naphtha cracking processes call for low aromatic feedstocks to satisfy the operational considerations regarding the quality of their feedstocks. Therefore, the issue of the aromatics removal from petroleum fractions has become more serious. In this study, the experimental investigation and thermodynamic modeling of the liquid-liquid equilibria of the quinary system naphtha cut (including paraffinic, naphthenic, and aromatic species), sulfolane, and water, over the temperature range of 303.2 to 333.2 K, have been studied. The molecular representatives of paraffinic, naphthenic, and aromatic species of naphtha cut have been determined based on different objective functions. Physical properties estimation and modeling of equilibrium data reveal higher accuracy of vapor pressure- and viscosity-based objective functions in the structural modeling of naphtha cut. The root-mean-square deviations for the mentioned functions were determined to be about 1.47 and 1.48%, respectively. Thermodynamic modeling with the predictive UNIFAC model showed a good agreement with the experimental measurements. Also, the interaction coefficients extracted from the 75 ºC equilibrium data led to minimum deviation in the equilibrium modeling. Finally, the phase diagrams show the noticeable effect of water content and the small effect of temperature on the system equilibria.

Keywords

Main Subjects

References

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Journal of Separation Science and Engineering
Volume 15, Issue 2
March 2024
Pages 1-16

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