A Semi-empirical Correlation for the Liquid Density of Heavy Hydrocarbons in Certain Pressure and Temperature Ranges

Document Type : Original Article

Authors
Amirhossein Oudi 1
Salehe Allami 1
Yegane Davoodbeygi 2
1 Ph.D. Student, Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran
2 Assistant Professor, Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering, University of Hormozgan, Bandar Abbas, Iran
Abstract
In the oil industry, knowing the physical and chemical properties is a key element in the development and control of this industry. The present research was conducted with the aim of obtaining a simple semi-empirical correlation for the liquid density of heavy hydrocarbons in certain pressure and temperature range. Density of eight heavy hydrocarbons after collecting experimental data and critical properties using equations of state SRK and PR Calculation and objective function based on optimization algorithm PSO It was minimized. The results obtained from the values related to the constant coefficients of the semi-empirical correlation are indicative of the inverse and direct relationship of density with temperature and pressure, respectively. On the other hand, a lower value of relative average error for the obtained semi-empirical correlation compared to SRK and PR equations of state was obtained for hydrocarbons with less carbon number. Also, in the lower temperature range, this correlation has a better performance and agreement with the experimental data, and in general, the resulting relationship is simple and has high accuracy and flexibility. The results showed that the average percentage of relative error resulting from calculating the liquid density of 8 heavy hydrocarbons according to the presented semi-empirical model is 1.18%, which is 17.33% less than the SRK equation of state and 7.67% better than the PR equation of state.

Keywords

Subjects

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  • Receive Date 25 January 2025
  • Revise Date 02 May 2025
  • Accept Date 20 May 2025