A mass transfer model for pure alcoholic permeation through the PDMS membrane

Mafi, Amirhossein; Raisi, Ahmadreza; Hatam, M.; Aroujalian, Abdolreza

doi:10.1080/19443994.2013.836996

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…However, the composition of the membrane can modify the solubility of the permeants and consequently affects the separation factor. According to Figure 5 a it is expected that the increase in temperature will increase the kinetic energy of the permeants [ 16 ], permeate fluxes, the vapor pressure [ 74 ], the swelling membrane [ 75 ] and the free volume in the membrane [ 76 ]. Despite the increase in water permeate flux, the solubility towards ethanol in the membrane surface was favorable, the ethanol permeate concentration increased slightly ( Figure 5 b) and consequently a small increase in the separation factor, such as observed in Figure 2 b and reported in the literature [ 66 ].…”

Section: Resultsmentioning

confidence: 99%

Separation and Semi-Empiric Modeling of Ethanol–Water Solutions by Pervaporation Using PDMS Membrane

et al. 2020

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High energy demand, competitive fuel prices and the need for environmentally friendly processes have led to the constant development of the alcohol industry. Pervaporation is seen as a separation process, with low energy consumption, which has a high potential for application in the fermentation and dehydration of ethanol. This work presents the experimental ethanol recovery by pervaporation and the semi-empirical model of partial fluxes. Total permeate fluxes between 15.6–68.6 mol m−2 h−1 (289–1565 g m−2 h−1), separation factor between 3.4–6.4 and ethanol molar fraction between 16–171 mM (4–35 wt%) were obtained using ethanol feed concentrations between 4–37 mM (1–9 wt%), temperature between 34–50 ∘C and commercial polydimethylsiloxane (PDMS) membrane. From the experimental data a semi-empirical model describing the behavior of partial-permeate fluxes was developed considering the effect of both the temperature and the composition of the feed, and the behavior of the apparent activation energy. Therefore, the model obtained shows a modified Arrhenius-type behavior that calculates with high precision the partial-permeate fluxes. Furthermore, the versatility of the model was demonstrated in process such as ethanol recovery and both ethanol and butanol dehydration.

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