Adsorptive Removal of TBM and THT Using Ion-exchanged N a y Zeolites

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CLEAN TECHNOLOGY, Vol. 15, No. 1, March 2009, pp. 60-66

Adsorptive Removal of TBM and THT Using Ion-exchanged N a y Zeolites

Gap Soon Jung, Seok Hee Lee, Jae Kee Cheon, Jae Wook Choe,+ and Hee Chul Woo*

Department of Applied Chemical Engineering and 'Department of Safety Engineering Pukyong National University

San 100 Yongdang-dong, Nam-gu, Busan 608-739, Korea

(Received for review February 25, 2009; Revision received March 23, 2009; Accepted March 24, 2009)

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Abshact : Adsorptive removal of tetrahydrothiophene (THT) and tert-butylmercaptan (TBM) that were widely used sulfur odorants in pipeline natural gas was studied using various ion-exchanged N a y zeolites at ambient temperature and atmospheric pressure. In order to improve the adsorption ability, ion exchange was performed on N a y zeolites with alkali metal cations of ~ i ' , ~ a ' , K+ and transition metal cations of cu2+,

~ i " , CO", A ~ + . Among the adsorbents tested, Cu-Nay and Ag-Nay showed good adsorption capacities for THT and TBM. These good behaviors of removal of sulfur compound for Cu-Nay and Ag-Nay zeolites probably was influenced by their acidity. The adsorption capacity for THT and TBM on the best adsorbent Cu-Nay-0.5, which was ion exchanged with 0.5 M copper nitrate solution, was 1.85 and 0.78 mmol-S/g at breakthrough, respectively. It was the best sulfur capacity so far in removing organic sulfur compounds from fuel gas by adsorption on zeolites. While the desorption activation energy of TBM on the Cu-Nay-0.5 was higher than Nay zeolite, the difference of THT desorption activation energy between two zeolites was comparatively small.

Key words : Adsorbent, Odorant, Adsorptive desulfurization, Zeolite

* To whom correspondence should be addressed.

E-mail: [email protected]

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