Experimental study of hydrogen fluoride adsorption on sodium fluoride

Sahar Afzal; Amir Rahimi; Mohammad Reza Ehsani; Hossein Tavakoli

Journal of Industrial and Engineering Chemistry, Vol.16, No.1, 147-151, January, 2010

DOI10.1016/j.jiec.2010.01.004 Export Citation

Experimental study of hydrogen fluoride adsorption on sodium fluoride

Sahar Afzal, Amir Rahimi^{1, †}, Mohammad Reza Ehsani, and Hossein Tavakoli²

Department of Chemical Engineering, Isfahan University of Technology, P.O. Box 84156-83111, Isfahan, Iran
¹Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box 81746-73441, Isfahan, Iran
²Department of Chemical Engineering and Petroleum, Sharif University of Technology, Tehran, Iran

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In uranium conversion industry, the fluorine is used as chemical raw material gas to produce UF4 and UF6 while its purity is very important. In this study, the adsorption process of hydrogen fluoride, as an impurity in the process of fluorine production, on sodium fluoride pellets is experimentally studied in a lab-scale fixed bed adsorbent. Also, the effects of some operating parameters including inlet concentration and inlet temperature of hydrogen fluoride are precisely investigated on the adsorption process. The data of adsorption are analyzed and correlated by Langmuir, Freundlich and Temkin isotherms. The adsorption capacity is found to be 1.908 and 0.750 g HF/g NaF by the Langmuir isotherm at 22 and 54 ℃, respectively. The favorability nature of adsorption which is expressed in terms of a dimensionless separation factor (R(L)) is found to be more than 1 which indicates an unfavorable adsorption. In addition, the data analysis shows that the Langmuir and Temkin isotherms correlate the equilibrium isotherms better than that of Freundlich.

Keywords:Adsorption;Hydrogen fluoride;Sodium fluoride;Isotherm

[References]

Kroschwiz JI, Kirk-Othmer, Seidel A, Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 11, fifth ed., Wiley-Interscience, 2004, pp. 826-850.
Cleveland FJ, U.S. Patent 1,141,260 (1915)
Groult H, Durand S, Devilliers D, Lantelme F, J. Fluorine Chem., 107, 247 (2001)
Ranchhoddas Merchant D, U.S. Patent 3,976,447 (1976)
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Mc Cabe WL, Smith JC, Harriott P, Unit Operation of Chemical Engineering, McGraw Hill, New York (1985)
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Hal KR, Eagleton LC, Acrivos A, Vermeulen T, Ind. Eng. Chem. Fundam., 5, 212 (1966)
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[Referenced By]

[1] Kroschwiz JI, Kirk-Othmer, Seidel A, Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 11, fifth ed., Wiley-Interscience, 2004, pp. 826-850.

[2] Cleveland FJ, U.S. Patent 1,141,260 (1915)

[3] Groult H, Durand S, Devilliers D, Lantelme F, J. Fluorine Chem., 107, 247 (2001)

[4] Ranchhoddas Merchant D, U.S. Patent 3,976,447 (1976)

[5] Weber E, Wolfe NL, Toxicol. Chem., 6, 911 (1987)

[6] Perry RH, Green DW, Perry’s Chemical Engineering Handbook, eighth ed., McGraw-Hill (2007)

[7] Mc Cabe WL, Smith JC, Harriott P, Unit Operation of Chemical Engineering, McGraw Hill, New York (1985)

[8] Stumm W, Morgan JJ, Aquatic Chemistry, second ed., Wiley Interscience, John Wiley & Sons (1981)

[9] Weber Jr. J, in: Metcalf RN, Pitts JN (Eds.), Adsorption in Physicochemical Processes for Water Quality Control, Wiley Interscience, New York, 1972, pp. 199-259 (Chapter 5).

[10] Hal KR, Eagleton LC, Acrivos A, Vermeulen T, Ind. Eng. Chem. Fundam., 5, 212 (1966)

[11] Terybal R, Mass Transfer Operations, third ed., McGraw Hill (1981)