3.2.2. Variation of feed weight fraction
Tests were performed with the fermentation broth of varying
ethanol by weight in the feed mixture, and the results were compared
with those obtained using the standard solution at the same
ethanol weight fraction. Figs. 6–8 show the comparison of results
obtained with the model mixture and fermentation broth for total
flux, separation and enrichment factors and pervaporation index,
respectively. The results of the parameters presented demonstrated
an increase that was observed with the pervaporation of
fermentation broth. The comparison between model solutions
and broth shows similar results, i.e., when the feed ethanol weight
fraction is increased, we observed an increase of flux, decrease of
enrichment and separation factor (consequently an increasing of
permeate ethanol weight fraction). More interesting, however, is
the increase in pervaporation index (Fig. 8), which indicates that
the pervaporation of the fermentation broth obtained from banana
residue with PDMS membrane has a more pronounced increase
with the increase of feed ethanol weight fraction than does the
model solution.
3.2.2. Variation of feed weight fractionTests were performed with the fermentation broth of varyingethanol by weight in the feed mixture, and the results were comparedwith those obtained using the standard solution at the sameethanol weight fraction. Figs. 6–8 show the comparison of resultsobtained with the model mixture and fermentation broth for totalflux, separation and enrichment factors and pervaporation index,respectively. The results of the parameters presented demonstratedan increase that was observed with the pervaporation offermentation broth. The comparison between model solutionsand broth shows similar results, i.e., when the feed ethanol weightfraction is increased, we observed an increase of flux, decrease ofenrichment and separation factor (consequently an increasing ofpermeate ethanol weight fraction). More interesting, however, isthe increase in pervaporation index (Fig. 8), which indicates thatthe pervaporation of the fermentation broth obtained from bananaresidue with PDMS membrane has a more pronounced increasewith the increase of feed ethanol weight fraction than does themodel solution.
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