Water and mercaptan adsorption on 13X zeolite in natural gas purification process

Babak Shirani; Tahereh Kaghazchi; Masoud Beheshti

Korean Journal of Chemical Engineering, Vol.27, No.1, 253-260, January, 2010

DOI10.1007/s11814-009-0327-z Export Citation

Water and mercaptan adsorption on 13X zeolite in natural gas purification process

Babak Shirani, Tahereh Kaghazchi^†, and Masoud Beheshti¹

Chemical Engineering Department, Amirkabir University of Technology, Tehran, Iran
¹Chemical Engineering Department, Isfahan University, Isfahan, Iran

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The aim of this work is to model the adsorption process used for mercaptan and water removal from natural gas. Three fixed beds containing Zeolite molecular sieve type 13X, are used in this plant. In this operation, two beds are in process for adsorption purposes and the other one is regenerated simultaneously. This system is also operated under isothermal condition. In modeling of this process, rate of adsorption is approximated by linear driving force (LDF) expression, and the extended Langmuir isotherm is used to describe adsorption equilibrium. The set of partial differential equations of dynamic model is solved by Crank-Nicolson method. The effect of equations of state is also studied and the best equation fitting the industrial data is selected. Also, concentration profile is presented versus bed length at various times. The influences of pressure, inlet concentration and bed height on the breakthrough time are also investigated.

Keywords:Adsorption;13X Zeolite;Natural Gas;Multicomponent Separation;Modeling;Feed Effect

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[2] Sankararao B, Gupta SK, Comput. Chem. Eng., 31(10), 1282 (2007)

[3] Mathias PM, Kumar R, Moyer JD, Schork JM, Srinivasan SR, Auvil SR, Talu O, Ind. Eng. Chem. Res., 35(7), 2477 (1996)

[4] Serbezov A, Sotirchos SV, Adsorption, 4, 93 (1998)

[5] Gorbach A, Stegmaier M, Eigenberger G, Adsorption, 10, 29 (2004)

[6] Ruthven DM, Principles of adsorption and adsorption processes, Wiley, New York (1984)

[7] Operating Manual, Document No. DB 2017 999 P312 202, SPGC Co.

[8] Grande CA, Rodrigues AE, Chem. Eng. Res. Des., 82(A12), 1604 (2004)

[9] Rota R, Wanket PC, AIChE J., 36, 1299 (1990)

[10] Jee JG, Park HJ, Haam SJ, Lee CH, Ind. Eng. Chem. Res., 41(17), 4383 (2002)

[11] Kim MB, Moon JH, Lee CH, Ahn H, Cho W, Korean J. Chem. Eng., 21(3), 703 (2004)

[12] Gupta A, Gaur V, Verma N, Chem. Eng. Process., 43(1), 9 (2004)

[13] Radrigues AE, Dias MM, Chem. Eng. Sci., 37, 489 (1998)

[14] Sohn S, Kim D, Chemosphere, 58, 115 (2005)

[15] Do DD, Adsorption analysis: Equilibria and kinetics, Imperial College Press, London (1998)

[16] Park JH, Kim JN, Cho SH, Kim JD, Yang RT, Chem. Eng. Sci., 53(23), 3951 (1998)

[17] Auerbach S, Carrado K, Dutta P, Handbook of zeolite science & technology, Marcel Dekker Inc., New York (2003)

[18] Rege SU, Yang RT, Buzanowski MA, Chem. Eng. Sci., 55(21), 4827 (2000)

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[20] Walas SM, Phase equilibria in chemical engineering, Butterworth Publishers (1985)