A New Experimental and Modeling Investigation of Wax Precipitation in Pipelines Based on Asphaltene Content
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A New Experimental and Modeling Investigation of Wax Precipitation in Pipelines Based on Asphaltene Content R. Salehia, M. R. Ehsania, and T. J. Behbahanib,* a Department
of Chemical and Mechanical Engineering, Chemical Engineering, Isfahan University of Technology, Isfahan, 8415683111 Iran b Research Institute of Petroleum Industry (RIPI), Tehran, 14665-1998 Iran *e-mail: [email protected] Received October 14, 2017; revised November 9, 2017; accepted May 11, 2020
Abstract—In this paper, a new model is proposed for wax precipitation. Fugacity of the solid phase is calculated indirectly by considering the fugacity of the pure liquid phase. In this approach, crude oil is divided into five pseudo components using the SARA test results. Solubility parameters were calculated by SRK (Soave Modification of Redlich Kwong) equation of state, and the composition of components is calculated by employing Rachford Rice equation. Also, geneticalgorithm was used to improve the accuracy of results in WAT and wax weight. The average deviation of WAT (Wax Appearance Temperature) was 0.11 and 0.15% in the multi solid and solid solution models respectively, also the average deviation of the wax weight was 10.32 and 5.8% in the multi solid and solid solution models, respectively. The results showed that the solid solution model was more accurate in the prediction of wax precipitation in pipelines, as compared to the multi solid model. The optimized parameters in this solid solution model were more effective and had a dynamic influence. The multi solid and solid solution models had a remarkable accuracy with the experimental data. There was no logical explanation for asphaltene on wax precipitation and WAT. As a result, asphaltene was omitted in five crude oils in order to investigate the effect on the wax weight percentage and WAT. Results reveal that after omitting asphaltene, WAT and wax weight percentage were decreased. Keywords: wax weight, asphaltene, wax appearance temperature, genetic algorithm
DOI: 10.1134/S0965544121030051
for the non ideality of solid and liquid phase description, paraffins, naphthenes and aromatics were considered in their model. Pedersen used the cubic equation of state for consistency in describing the liquid phase in SLE and VLE calculation [4, 5]. Coutinho et al. [6], used Flory Huggins theory, their model had good accuracy with the experimental data in low pressure. then, they proposed a model that used the characteristic energy parameter to increase the accuracy of results and used the Wilson model to calculate the activity coefficient [6, 7]. Pauly et al. [8], improved Coutinho model by SRK equation of state, GE, and characteristic energy parameter to determine liquid fugacity, this model had good accuracy at high pressure. Tabatabaei-Nejad and Khodapanah [9], considered the suitable parameters to describe the behavior of the solid phase. They used the regular solution theory and the cubic equation of state to describe the liquid-vapor behavior. Their results show a good accuracy
INTRODUCTION Crude
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