Adsorption Equilibrium of Light Mercaptans on Faujasites

Author: Weber Guy   Bellat Jean-Pierre   Benoit Frederic   Paulin Christian   Limborg-Noetinger Sophie   Thomas Michel  

Publisher: Springer Publishing Company

ISSN: 0929-5607

Source: Adsorption, Vol.11, Iss.1, 2005-07, pp. : 183-188

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Abstract

Both thermogravimetry and manometry coupled to calorimetry techniques were used to determine the adsorption equilibrium of ethyl mercaptan in pure and extruded NaX zeolites. Sorption isotherms were investigated from 298 to 373 K, and over a large range of pressure from 10− 4 to 100 hPa. Adsorption heats were measured at 298 K. Reversible adsorption-desorption isotherms are type I shaped and characterize a very high adsorption affinity of NaX zeolites for ethyl mercaptan. The sulfur compound entirely probes NaX zeolite α-cages at micropore saturation. The presence of the mineral binder for the extruded zeolite does not affect the adsorption phenomenon. Adsorption data were well fitted using the Polanyi-Dubinin model. Calorimetric and isosteric heats do not change very much with loading, indicating that NaX zeolite is energetically homogeneous for the adsorption of ethyl mercaptan. Additional information concerning state of adsorbed phase were obtained from isosteric molar entropy curves. Therefore, the NaX faujasite appeared as a powerful potential candidate for industrial desulfurization of natural gas by adsorption process.