MODELING OF ETHANOL DEHYDRATION BY DIFFUSION DISTILLATION IN CONSIDERATION OF THE SENSIBLE HEAT TRANSFER

Kim SC; Lee DW; Hong WH

Korean Journal of Chemical Engineering, Vol.13, No.3, 275-281, May, 1996

The diffusion distillation is the evaporation and diffusion process below the boiling temperature of the mix-ture in a gap filled with the inert gas. It can separate the azeotropic mixture of ethanol and water. The mass transfer in a differential single column can be described by the Maxwell-Stefan equations. Differential mass balances which can ex-tend a column model from a differential single column to an integral column and heat balances were suggested. The new model considers the sensible heat transfers and develops algorithm which enables to calculate interfacial temperature more precisely at condensing liquid film and include one more iterative loop. The results are compared with the experimental data and other models.

Keywords:Diffusion Distillation;Mass Transfer;Heat Transfer;Ethanol/Water Azeotrope

[References]

Ackermann G, "Heat Transfer and Molecular Mass Transfer in the Same Field at high Temperatures and Large Partial Pressure Differences," VDI Forschungsh, 8, 1 (1937)
Bird RB, Stewart WE, Lightfoot EN, "Transport Phenomena," Wiley, New York (1960)
Carty R, Schrodt JT, Ind. Eng. Chem. Fundam., 14, 276 (1975)
Chung IS, Song KM, Hong WH, Chang HN, HWAHAK KONGHAK, 32(5), 734 (1994)
Colburn AP, Hougen OA, Ind. Eng. Chem., 25, 1178 (1934)
Cussler EL, "Multicomponent Diffusion," Elsevier Scientific Publishing Company, Amsterdam (1976)
Fullarton D, Schlunder EU, Ind. Eng. Chem. Fundam., 2, 53 (1983)
Gmehling J, Onken U, "Vapour-Liquid Equilibrium Data Collection Series Vol. 1," DECHEMA, Frankfurt-am-Main (1977)
Kim SC, M.S. Thesis, KAIST, Kaejon, Korea (1994)
Krishna R, Standart GL, AIChE J., 22, 383 (1976)
McDowell JK, Davis JF, Ind. Eng. Chem. Res., 27, 2139 (1988)
Sandall O, Dribika MM, "Simultaneous Heat and Mass Transfer for Multicomponent Distillationin Continuous Contact Equipment," Paper Pres. 3rd Int. Symp. on Distillation, London (1979)
Stewart WE, Prober R, Ind. Eng. Chem. Fundam., 3, 224 (1964)
Taylor R, Smith LW, Chem. Eng. Commun., 14, 361 (1982)
Taylor R, Webb DR, Comput. Chem. Eng., 5, 61 (1981)
Toor HL, AIChE J., 10, 448 (1964)
Webb DR, Saradesai RG, Int. J. Multiph. Flow, 5, 507 (1981)

[Referenced By]

[1] Ackermann G, "Heat Transfer and Molecular Mass Transfer in the Same Field at high Temperatures and Large Partial Pressure Differences," VDI Forschungsh, 8, 1 (1937)

[2] Bird RB, Stewart WE, Lightfoot EN, "Transport Phenomena," Wiley, New York (1960)

[3] Carty R, Schrodt JT, Ind. Eng. Chem. Fundam., 14, 276 (1975)

[4] Chung IS, Song KM, Hong WH, Chang HN, HWAHAK KONGHAK, 32(5), 734 (1994)

[5] Colburn AP, Hougen OA, Ind. Eng. Chem., 25, 1178 (1934)

[6] Cussler EL, "Multicomponent Diffusion," Elsevier Scientific Publishing Company, Amsterdam (1976)

[7] Fullarton D, Schlunder EU, Ind. Eng. Chem. Fundam., 2, 53 (1983)

[8] Gmehling J, Onken U, "Vapour-Liquid Equilibrium Data Collection Series Vol. 1," DECHEMA, Frankfurt-am-Main (1977)

[9] Kim SC, M.S. Thesis, KAIST, Kaejon, Korea (1994)

[10] Krishna R, Standart GL, AIChE J., 22, 383 (1976)

[11] McDowell JK, Davis JF, Ind. Eng. Chem. Res., 27, 2139 (1988)

[12] Sandall O, Dribika MM, "Simultaneous Heat and Mass Transfer for Multicomponent Distillationin Continuous Contact Equipment," Paper Pres. 3rd Int. Symp. on Distillation, London (1979)

[13] Stewart WE, Prober R, Ind. Eng. Chem. Fundam., 3, 224 (1964)

[14] Taylor R, Smith LW, Chem. Eng. Commun., 14, 361 (1982)

[15] Taylor R, Webb DR, Comput. Chem. Eng., 5, 61 (1981)

[16] Toor HL, AIChE J., 10, 448 (1964)

[17] Webb DR, Saradesai RG, Int. J. Multiph. Flow, 5, 507 (1981)