Effect of Two Liquid Phases on the Separation Efficiency of Distillation Columns


Distillation is one of the oldest and most important separation processes used in the chemical and petrochemical industries. On the other hand, it is a process the thermodynamic efficiency of which is very low, and therefore reducing the consumption of energy is one of the targets of research studies on distillation. This article arose from seeking to reduce energy consumption in a distillation train of 1,2-dichloroethane (ethylene dichloride-EDC) of a commercial plant producing vinyl monochloride (VMC), which involves an azeotropic distillation column. The reduction in the reboiler heat duty caused significant changes in concentration and temperature profiles throughout the column due to the formation of two liquid phases. The results show that, although very small in percentage terms (less than 2.5%), the appearance of the 2nd liquid phase causes significant changes in the operation of the column and the separation achieved.

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G. Cordeiro, S. Dantas, L. Vasconcelos and R. Brito, "Effect of Two Liquid Phases on the Separation Efficiency of Distillation Columns," Advances in Chemical Engineering and Science, Vol. 3 No. 1, 2013, pp. 1-8. doi: 10.4236/aces.2013.31001.

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The authors declare no conflicts of interest.


[1] G. Soave and J. A. Feliu, “Saving Energy in Distillation by Feed Splitting,” Applied Thermal Engineering, Vol. 22, No. 8, 2002, pp. 889-896.
[2] R. H. Perry, D. W. Green and J. O. Maloney, “Perry’s Chemical Engineer’s Handbook,” 7th Edition, McGraw-Hill, New York, 1999.
[3] L. Laroche, N. Bekiaris, H. W. Andersen and M. Morari, “The Curious Behaviour of Homogeneous Azeotropic Distillation—Implications for Entrainer Selection,” AIChE Journal, Vol. 38, No. 9, 1992, pp. 1309-1328.
[4] N. Bekiaris, E. G. Guttinger and M. Morari, “Multiple Steady States in Distillation: Effect of VL(L)E Inaccuracies,” AIChE Journal, Vol. 46, No. 5, 2000, pp. 955-979.
[5] T. M. Magnussen, L. Michelsen and A. A. Fredenslund, “Azeotropic Distillation Using UNIFAC,” Chemical Engineering Progress Symposium Series, Vol. 56, No. 4, 1979.
[6] M. Rovaglio and F. M. Doherty, “Dynamics of Heterogeneous Azeotropic Distillation Columns,” AIChe Journal, Vol. 36, No. 1, 1990, pp. 39-52.
[7] C. J. Wang, D. S. Wong, I.-L. Chien, R. F. Shih, S. J. Wang and C. S. Tsai, “Experimental Investigation of Multiple Steady States and Parametric Sensitivity in Azeotropic Distillation,” Computer and Chemical Engineering, Vol. 21, 1997, pp. S535-S540.
[8] W. L. Luyben, “Control of the Heterogeneous Azeotropic n-Butanol/Water,” Energy and Fuels, Vol. 22, No. 6, 2008, pp. 4249-4258. doi:10.1021/ef8004064
[9] Y. Wu and I. Chien, “Design and Control of Heterogeneous Azeotropic Column System for the Separation of Pyridine and Water,” Industrial & Engineering Chemistry Research, Vol. 48, No. 23, 2009, pp. 10564-10576. doi:10.1021/ie901231s
[10] M. Z. Lao and R. Taylor, “Modeling Mass-Transfer in 3-Phase Distillation,” Industrial and Engineering Chemistry Research, Vol. 33, No. 11, 1994, pp. 2637-2650. doi:10.1021/ie00035a015
[11] S. Widagdo and W. D. Seider, “Azeotropic Distillation,” AIChE Journal, Vol. 42, No. 1, 1996, pp. 96-130.
[12] A. Higler, R. Chande, R. Taylor, R. Baur and R. Krishna, “Non-Equilibrium Modeling of Three-Phase Distillation,” Computers and Chemical Engineering, Vol. 28, No. 10, 2004, pp. 2021-2036. doi:10.1016/j.compchemeng.2004.04.008
[13] B. P. Cairns and I. A. Furzer, “Multicomponent 3-Phase Azeotropic Distillation—Extensive Experimental Data and Simulation Results,” Industrial and Engineering Chemistry Research, Vol. 29, No. 7, 1990, pp. 1349-1363. doi:10.1021/ie00103a040
[14] T. L. Junqueira, M. O. S. Dias, R. Maciel Filho, M. R. W. Maciel and C. E. V. Rossel, “Simulation of the Azeotropic Distillation for Anhydrous Bioethanol Production: Study on the Formation of a Second Liquid Phase,” Computer Aided Chemical Engineering, Vol. 27, 2009, pp. 1143-1148. doi:10.1016/S1570-7946(09)70411-0
[15] A. R. Silva, J. H. P. Brooman, L. R. Braga Jr., L. G. S. Vasconcelos and R. P. Brito, “Steady-State and Dynamics Behavior of an Industrial Azeotropic Distillation Column,” The 6th Italian Conference on Chemical and Process Engineering, Pisa, 8-11 June 2003.
[16] B. P. Guedes, M. F. Figueiredo, L. G. S. Vasconcelos, A. C. B. Araújo and R. P. Brito, “Sensitivity and Dynamic Behavior Analysis of an Industrial Azeotropic Distillation Column,” Separation and Purification Technology, Vol. 56, No. 3, 2007, pp. 270-277. doi:10.1016/j.seppur.2007.02.014
[17] “Azeotropic Data-III, Advances in Chemistry Series,” In: R. F. Gould, Ed., Advances in Chemistry Series, Vol. 116, American Chemical Society, Washington DC, 1973, pp. 1-6.
[18] Pennsylvania State University, “Dechema Chemistry Data Series,” Deutsche Gesellschaft für Chemisches Aparatewesen, Frankfurt am Main, 1990.

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