Influence of Various Factors on Stability of CoSPc in LPG Sweetening Process

Authors: Ali Samadi Afshar, Hamed Harrafi, S.M.Javad Gharib Zahedi

Abstract:

IFP Group Technology “Sulfrex process" was used in Iran-s South Pars Gas Complex Refineries for removing sulfur compounds such as mercaptans, carbonyl sulfide and hydrogen sulfide, which uses sulfonated cobalt phthalocyanine dispersed in alkaline solution as catalyst. In this technology, catalyst and alkaline solution were used circularly. However the stability of catalyst due to effect of some parameters would reduce with the running of the unit and therefore sweetening efficiency would be decreased. Hence, the aim of this research is study the factors effecting on the stability of catalyst.

Keywords: sulfonated cobalt phthalocyanine, mercaptans, stability, catalyst, sulfur.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1075925

References:

[1] Mehmandoost, S., Hejaz, P, "Propane Treatment unit, Operating Manual, Basis of Design & Unit Operating Considerations", Iran South Gas Field, Phases 9&10 (2005).
[2] Tian, Y. L., Wang, Y. H., Liu, R. T., et al, "Stability of cobalt sulfonated phthalocyanine in liquidized petroleum gas sweetening process", J. China Univ, Petro, 30:123-125, (2006).
[3] Yuan, S. H., Wu, X., Yao, R., and Zheng, G., "Study on axial coordination reaction for cobalt tetrasulfonate phthalocyanine", Photogr, Sci. Photochem, 14:341-346, (1996).Z. Mallaki, et al., "Revamping of Merox LPG Sweetening Unit for Deeper Desulfurization," M.Sc Thesis, Iran, Sharif University of Technology, Chemical& Petroleum Eng. Dept, 2007
[4] Xia. D., Li, Xuhui, Liu. R and Xiang. Y., "Stability and Activity of CoSPc in LPG Sweetening", Petroleum Science and Technology, 26: 12, 1381- 1389, (2008).
[5] Liu. R, Xia, D. Xiang, Y and Tian, Y., "Effects of Caustic Concentration on the LPG Sweetening", Petroleum Science and Technology, 23: 5, 711 -721, (2005).
[6] Xia. D., Su.Y and Qiant. J., "Study on the Oxidation Mechanism of Mixed Thiols in Light Oil Sweetening. Kinetics and Mechanism of Homogeneous Catalytic Co oxidation of mixed 2-Methyl-2-propanethiol and Ethanethiol", Ind. Eng. Chem. Res. 1995, 34, (2001-2005).