TY - JOUR

T1 - Experimental investigation and thermodynamic modeling of wax disappearance temperature for n-undecane+n-hexadecane+n-octadecane and n-tetradecane+n-hexadecane+n-octadecane ternary systems

AU - Aftab, S.

AU - Javanmardi, J.

AU - Nasrifar, K.

N1 - Funding Information:
Financial support from Shiraz University of Technology is greatly acknowledged.
Publisher Copyright:
© 2015 Elsevier B.V.

PY - 2015

Y1 - 2015

N2 - In this investigation, the wax disappearance temperatures (WDT) of two ternary n-alkane systems including n-undecane + n-hexadecane + n-octadecane and n-tetradecane + n-hexadecane + n-octadecane are measured using a homemade visual-based apparatus working under atmospheric pressure (0.9. bar). The two aforementioned ternary systems are modeled thermodynamically without using any adjustable parameter to predict the wax disappearance temperature. Two methods are used for modeling. In one method, perturbed-chain statistical associating fluid theory (PC-SAFT) is used to describe the liquid phase while the solid phase is described by a solid solution model. In the other method, the nonidealities of the liquid and solid phases are both captured using activity coefficient models. Ideal solution, regular solution theory and predictive Wilson are used separately for description of the liquid phase while ideal solution, regular solution theory, predictive Wilson, predictive UNIQUAC and UNIFAC activity coefficient models are used to describe the nonideality of the solid phase. The obtained results show that the use of regular solution theory for the liquid phase and predictive Wilson for the solid phase leads to closer results to the experimental data compared with other combinations of models for both examined systems.

AB - In this investigation, the wax disappearance temperatures (WDT) of two ternary n-alkane systems including n-undecane + n-hexadecane + n-octadecane and n-tetradecane + n-hexadecane + n-octadecane are measured using a homemade visual-based apparatus working under atmospheric pressure (0.9. bar). The two aforementioned ternary systems are modeled thermodynamically without using any adjustable parameter to predict the wax disappearance temperature. Two methods are used for modeling. In one method, perturbed-chain statistical associating fluid theory (PC-SAFT) is used to describe the liquid phase while the solid phase is described by a solid solution model. In the other method, the nonidealities of the liquid and solid phases are both captured using activity coefficient models. Ideal solution, regular solution theory and predictive Wilson are used separately for description of the liquid phase while ideal solution, regular solution theory, predictive Wilson, predictive UNIQUAC and UNIFAC activity coefficient models are used to describe the nonideality of the solid phase. The obtained results show that the use of regular solution theory for the liquid phase and predictive Wilson for the solid phase leads to closer results to the experimental data compared with other combinations of models for both examined systems.

KW - Activity coefficient model

KW - N-Alkanes

KW - SAFT

KW - Ternary mixtures

KW - Thermodynamic modeling

KW - Wax disappearance temperature

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U2 - 10.1016/j.fluid.2015.06.004

DO - 10.1016/j.fluid.2015.06.004

M3 - Article

AN - SCOPUS:84934898010

VL - 403

SP - 70

EP - 77

JO - Fluid Phase Equilibria

JF - Fluid Phase Equilibria

SN - 0378-3812

ER -