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Received February 8, 2001
Accepted April 30, 2001
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Adsorption Equilibrium of Solvent Vapors on Activated Carbons
Neophotech Inc., 633-1 Goan-Ri, Backam-Myun, Yongin City, Kyunggi 449-860, Korea 1Faculty of Applied Chemistry, Chonnam National University, Kwangju 500-757, Korea
hmoon@chonnam.ac.kr
Korean Journal of Chemical Engineering, July 2001, 18(4), 518-524(7), 10.1007/BF02698300
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Abstract
Adsorption amounts of solvent vapors such as n-hexane, toluene, and MEK on two commercial activated carbons (SLG-2PS and X-7000) were measured experimentally using a quartz spring balance connected with a high vacuum system. Single-species equilibrium data show typical type II isotherms, which are most frequently encountered in separation processes. Equilibrium data obtained at relative vapor pressures less than 0.3 were fitted to four wellknown isotherms such as Langmuir, Freundlich, Sips, and Dubinin-Astakov (D-A) equations. All isotherm equations were found to describe experimental equilibrium data satisfactorily. Only the Langmuir equation was not proper to fit the equilibrium data of solvent vapors on SLG-2PS. In order to evaluate the adsorption energy distribution of the solvent vapors on activated carbons, a simple model based on the condensation approximation (CA) approach was applied. According to the result, it was proven that two carbons have energetically heterogeneous surfaces.
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References
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Jaroniec M, Madey R, "Physical Adsorption on Heterogeneous Solids," Elsevier, New York (1988)
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Lee JW, Park HC, Moon H, Sep. Purif. Technol., 12, 1 (1997)
Manes M, "Fundamentals of Adsorption," Edited by Myers and Belfort, 335 (1984)
Moon H, Tien C, Chem. Eng. Sci., 43, 1269 (1988)
Mukhopadhyay N, Moreti EC, "Current & Potential Furure Industrial Practices for Reducing and Controlling Volatile Organic Compounds," American Institute of Chemical Engineers, New York (1993)
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Ruthven DM, "Principles of Adsorption and Adsorption Processes," John Wiley Sons, New York (1984)
Takeuchi Y, Shigeta A, J. Chem. Eng. Jpn., 24, 411 (1991)
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Yun JH, Choi DK, Moon H, Chem. Eng. Sci., 55(23), 5857 (2000)
Yun JH, Choi DK, Kim SH, Moon H, Korean J. Chem. Eng., 14(5), 369 (1997)
