EFFECTS OF CONCENTRATION DEPENDENCE OF SURFACE DIFFUSIVITY ON THE TRANSPORT AND ADSORPTION OF GASES IN A SOLID SPHERE WITH BIDISPERSE PORES

Kim SS; Lee CS

Korean Journal of Chemical Engineering, Vol.9, No.2, 98-104, April, 1992

Kim SS, Lee CS

A model for transport and adsorption of gases in a biporous solid sphere was presented assuming a linear adsorption isotherm and linear concentration dependence of surface diffusivity. When put into dimensionless form this model is characterized by four dimensionless parameters. To help assessing the error involved in using constant effective diffusivities, numerical results were presented for the uptake of pure gases into a biporous solid sphere with concentration dependent diffusivity and compared with those for effective diffusivity model. The error in transient uptake was found to be as large as ten percent.

[References]

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Ruchenstein E, Vaidyanathan AS, Youngquist GR, Chem. Eng. Sci., 26, 1305 (1971)
Kapoor A, Yang RT, Chem. Eng. Sci., 46, 1995 (1991)
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Lee CS, O'Connell JP, AIChE J., 32, 96 (1986)
Lee CS, O'Connell JP, AIChE J., 32, 107 (1986)
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Kim SS, Ph.D. Dissertation, Korea Univ., Seoul. Korea (1989)
Duford DE, Frankel SP, Math. Tables Aids Compt., 7, 135 (1953)
Iler RK, "The Chemistry of Silica," Cornell Univ. Press (1978)
Kanazawa T, Chikazawa M, Takei T, Mukasa K, Yogyo-Kyokai-Shi, 92, 655 (1984)

[1] Yang RT, "Gas Separation by Adsorption Processes," Butterworths, Boston (1987)

[2] Ruchenstein E, Vaidyanathan AS, Youngquist GR, Chem. Eng. Sci., 26, 1305 (1971)

[3] Kapoor A, Yang RT, Chem. Eng. Sci., 46, 1995 (1991)

[4] Ruthven DM, "Principles of Adsorption and Adsorption Processes," John Wiley & Sons, Inc. (1984)

[5] Lee CS, O'Connell JP, AIChE J., 32, 96 (1986)

[6] Lee CS, O'Connell JP, AIChE J., 32, 107 (1986)

[7] Satterfield CN, "Mass Transfer in Heterogeneous Catalysis," MIT Press (1970)

[8] Okazaki M, Tamon H, Toei R, AIChE J., 27, 262 (1981)

[9] Barrer RM, Strachan E, Proc. Roy. Soc., 231A, 15 (1955)

[10] Gilliland ER, Baddour RF, Perkinson GP, Sladek KJ, Ind. Eng. Chem. Fundam., 13, 95 (1974)

[11] Kim SS, Ph.D. Dissertation, Korea Univ., Seoul. Korea (1989)

[12] Duford DE, Frankel SP, Math. Tables Aids Compt., 7, 135 (1953)

[13] Iler RK, "The Chemistry of Silica," Cornell Univ. Press (1978)

[14] Kanazawa T, Chikazawa M, Takei T, Mukasa K, Yogyo-Kyokai-Shi, 92, 655 (1984)