Document Type : Full article


CFD Research Center, Department of Chemical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran


In this work, the role of appropriate mixing for mercaptan removal from Kerosene using caustic soda has been investigated in the pilot scale. Static mixer at different condition has been used as a passive mixing tool to achieve proper mixing and consequently high performance of mercaptan removal. Two lengths of static mixer including 20 and 40 cm as well as two pitches 1 and 3 mm were considered in a straight line. NaOH was injected to the Kerosene line to remove ( convert it to disulfide) the mercaptan. The effect of mixer length, mixer element pitch at different flow rates of Kerosene, including 2, 18 and 30 mL/s was investigated on the mercaptan removal. The experimental results showed that the concentration of mercaptan in the pilot line outlet will decrease as the flow rates of Kerosene decreases. Also, at a fixed flow rate of Kerosene, increasing the length of the static mixer and decreasing its element pitch caused the mercaptan to decrease due to proper mixing. Computational Fluid Dynamics (CFD) modeling technique was employed to describe the experimental results, fluid flow pattern, and mixing performance. Qualitative predicted results of CFD modeling show a good agreement with the experimental data.


Main Subjects

[1]      Rezvani, M. A., and Zonoz, F. M., “An organic-inorganic hybrid compound constructed by polytungsto-vanadosilicate and hexadecyltrimenthyl ammonium as an efficient catalyst for demercaptation of crude oil”, J. Ind. Eng. Chem., 22, 83 (2015).

[2]      de Angelis., A., “Natural gas removal of hydrogen sulphide and mercaptans”, Appl. Catal., B., 113-114, 37 (2012).

[3]      Mirzaeian, M., Rashidi, A. M., Zare, M., Ghabezi, R. and Lotfi, R., “Mercaptan removal from natural gas using carbon nanotube supported cobalt phthalocyanine nanocatalyst”, J. Nat. Gas. Sci. Eng., 18, 439 (2014).

[4]      Wiley, J., Ullmann's chemical engineering and plant design, Volumes 1–2, (2005).

[5]      Thakuri, R. K., Vial, Ch., Nigam, K. D. P., Nauman, E. B. and Djelveh, G., “Static mixers in the process industries: A review”, Chem. Eng. Res. Des., 81 (7), 787 (2003).

[6]      Munte, R., “Comparison of mass transfer efficiency and energy consumption in static mixer”, Ozone: Sci & Eng., 32, 399 (2010).

[7]      Heyouni, A., Roustan, M. and Do-Quang, Z., “Hydrodynamics and mass transfer in gas–liquid flow through static mixers”, Chem. Eng. Sci., 57, 3325 (2002).

[8]      Hobbs, D. M. and Muzzio, F. J., “Optimization of a static mixer using dynamical systems techniques", Chem. Eng. Sci., 53, 3199 (1998).

[9]      Meyer, T., David, R., Renken, A. and Villermaux, J., “Micromixing in a static mixer and an empty tube by a chemical method”, Chem. Eng. Sci., 43 (8), 1955 (1988).

[10]  Fang, J. and Lee, D., “Micromixing efficiency in static mixer”, Chem. Eng. Sci., 56, 3797 (2001).

[11]  Fourcade, E., Wadley, R., Hoefsloot, H. C. J., Green, A. and Iedema, P. D., “CFD calculation of laminar striation thinning in static mixer reactors”, Chem. Eng. Sci., 56, 6729 (2001).

[12]  Lindenberg, C., Sch¨oll, J., Vicum, L., Mazzotti, M. and Brozio, J., “Experimental characterization and multi-scale modeling of mixing in static mixers”, Chem. Eng. Sci., 63, 4135 (2008).

[13]  Fahim, M. A.,  Al-Sahhaf, T. A. and  Elkilani, A., Fundamentals of petroleum refining, acid gas processing and mercaptans removal, Kuwait University., 3rd ed., 377 (2010).

[14]  Parvareh, A., Rahimi, M., Yarmohammadi, M. and Alsairafi, A. A., “Experimental and CFD study on the effect of jet position on reactant dispersion performance”, Int. Commun. Heat. Mass., 36, 1096 (2009).