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Received June 3, 2009
Accepted July 6, 2009
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Water and mercaptan adsorption on 13X zeolite in natural gas purification process
Chemical Engineering Department, Amirkabir University of Technology, Tehran, Iran 1Chemical Engineering Department, Isfahan University, Isfahan, Iran
kaghazch@aut.ac.ir
Korean Journal of Chemical Engineering, January 2010, 27(1), 253-260(8), 10.1007/s11814-009-0327-z
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Abstract
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)_x000D_
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.
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