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Tesi etd-10262016-134405


Tipo di tesi
Tesi di laurea magistrale
Autore
MARCHI, ANDREA
URN
etd-10262016-134405
Titolo
Experimental determination of the liquid phase volumetric mass-transfer coefficient by desorption of oxygen from alcohols systems in packed column
Dipartimento
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA CHIMICA
Relatori
relatore Prof.ssa Brunazzi, Elisabetta
controrelatore Prof. Nicolella, Cristiano
Parole chiave
  • alcohols systems
  • Experimental
  • mass-transfer coefficient
  • oxygen
Data inizio appello
23/11/2016
Consultabilità
Completa
Riassunto
Volumetric mass-transfer coefficient for Mellapak M250Y, M350Y and M500Y has been measured by standard method of desorption of oxygen into nitrogen stream from methanol, ethanol and n-propanol.
Proportionality of these kLa values with liquid flow rate have been found with the power of 0.6-0.7, accordingly with those found for acqueous systems.
As expected, highest values of kLa has been found for the substance with lowest viscosity/ highest diffusivity values (methanol), even if they are very similar for all the substances under the same superficial velocities, for all the packings tested.
Experimental kLa datas have been compared with predicted values from mass-transfer models (e.g. Bravo-Rocha-Fair, Brunazzi etc.), with values measured for the same systems (alcohol-O2-N2) in the wetted wall column and with datas obtained under distillation conditions for mixtures of the same alcohols (MeOH-EtOH; MeOH-PrOH; EtOHPrOH).
Several attempts to correlate the experimental data to predict the liquid phase volumetric mass-transfer coefficient have been done, altough it has not been possible to develop any correlation with satisfactory accuracy.
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