ESTIMATION OF MASS TRANSFER COEFFICIENTS IN A PACKED DISTILLATION COLUMN USING BATCH MODE
DOI:
https://doi.org/10.31699/IJCPE.2011.1.2Keywords:
mass transfer coefficient; distillation; packed column.Abstract
This research adopts the estimation of mass transfer coefficient in batch packed bed distillation column as function of physical properties, liquid to vapour molar rates ratio (L / V), relative volatility (α), ratio of vapour and liquid diffusivities (DV / DL), ratio of vapour and liquid densities (ρV / ρL), ratio of vapour and liquid viscosities (μV/ μL).
The experiments are done using binary systems, (Ethanol Water), (Methanol Water), (Methanol Ethanol), (Benzene Hexane), (Benzene Toluene). Statistical program (multiple regression analysis) is used for estimating the overall mass transfer coefficient of vapour and liquid phases (KOV and KOL) in a correlation which represented the data fairly well.
KOV = 3.3 * 10-10 α-0.7 (DV / DL) 0.65 (L / V) 3.5 (ρV / ρL) 1.25 (μV / μL) -5.0
KOL = 2.8 * 10-6 α-0.95 (DV / DL) 0.03 (L / V) 1.15 (ρV / ρL )0.077 (μV / μL) -0.9
In this research a method where the resistances to mass transfer in both phases are accounted for separately through the use of HTU-NTU model for each phase
Z=HTUOV.NTUOV and Z=HTUOL.NTUOL
Results show that both overall vapour and liquid mass transfer coefficient are increased with liquid to vapour molar rates ratio, vapour to liquid diffusivities ratio and vapor to liquid densities ratio, but decreased with increasing the relative volatility and vapour to liquid viscosities ratio.
References
Perry H. (1997) “Perry,s Chemical Engineers Handbook", Mc-Graw Hill Inc.
Reji J., Linek K., Moucha T., Prokovopva E., and Valenz L. (2006) "Vapour and Liquid Side Volumetric Mass Transfer Coefficients Measured in Distillation Column: Comparison with Data Calculated from Absorption Correlations", vol.61 pp(6096-6108).
Linek V., Moucha T., Prokopova E. and Reji J. (2005) "Simultaneous Determination Of Vapour And Liquid Side Volumetric Mass Transfer Coefficient S In Distillation Column", Chem.Eng.Res.Des., vol.83 pp(979-986).
Kayihan F., Orvelle C. and Mellichamp A. (1977) "Simultaneous Heat And Mass Transfer In Binary Distillation", Chem.Eng.Sci., vol.32 pp. (747-754).
Honorat A. and Orville C. (1978) "Simultaneous Heat And Mass Transfer In A Packed Binary Distillation Column", Chem.Eng.Sci., vol33 pp(635-640).
Krishnamurthy R. and Tayler R. (1985) "Simultaneous Of Packed Distillation And Absorption Columns", Ind.Eng.Chem.Proc.Des.Dev., vol.24 pp(513-524).
Lee Y., Kim G., Dong M. and Oda A. (1997) "Analysis Of Packed Distillation Columns With A Rate-Based Model", Korean J. of Chem.Eng.Sci., vol.35 pp (2337-2343).
Lee Y. and Dong P. (1999) "Estimation of Concentration Profiles of the AcetoneMethanol-2-Propanol System in a Batch Packed Bed Distillation Column", J.korea inst.chem.eng., vol.37, no.3 pp(453-458).
Onda K., Takeuchi H. and Okumoto Y. (1968) "Mass Transfer Coefficients Between Gas and Liquid Phases in Packed Columns", Chem.Eng.Jap. Vol.1, No.1 (1968) .
Billet R. and Schultes M. (1999) "Prediction Of Mass Transfer Columns With Dumped And Arranged Packings"Inst.Chem.Eng.,vol.77 pp(498-504).
Chen J., (1950) "Distillation Equilibrium Data", Reinhold, New York.
Robert C., John M. and Poling E. "(1978) "The Properties of Gases and Liquids", Mc-Graw Hill Inc., fourth edition.
Pelkonon S., Kaeseman R. and Goral A. (1997) "Distillation Lines For Multicomponenet Sepatation In A Packed Columns, Theory And Comparison With Experiments", Ind.Eng.Chem.Res., 36: (5392-5398).
Selman M. D., “Estimation of Mass Transfer Coefficient in a Packed Bed Distillation Column Using Batch Mode”, Ph.D. Thesis, Chemical Engineering Department, Baghdad University (2009).
Downloads
Published
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
