Thesis Archive
Separation of water-ethanol system through extractive distillation with the use of magnesium chloride and bioglycerol as entrainers (2012)
Castillo, Joana Rose
Dandan, Alessandra Nicole
Dela Cruz, Jamie Frances
Abstract:
-The increasing energy demand called for the use of renewable sources of energy; one of which is the use of anhydrous ethanol as an additive to fuel. Anhydrous ethanol, however, is obtained in two steps: distillation and dehydration. This study attempted to eliminate the dehydration process by using magnesium chloride (MgCl2) and bioglycerol as entrainer. Concentrations of the MgCl2- glycerol mixture were as follows: 0.25% (w/w) MgCl2 and 4.75% (of w/w) bioglycerol; 0.5 % (w/w) MgCl2 and 4.5% (w/w) bioglycerol; 0.5%(w/w) MgCl2 and 9.5% (w/w) biolycerol; 1%(w/w) MgCl2 and 9% (w/w) bioglycerol. All VLEs of ethanol-water systems with the entrainer showed higher ethanol recovery in the vapour phase at concentrations below the azeotrope. Further, at higher MgCl2 concentrations, the azeotrope, 0.80% (w/w) ethanol, was shifted. At 0.5 % (w/w) MgCl2 and 4.5% (w/w) bioglycerol, the azeotrope was shifted from 0.80 to 0.88 mass fraction of ethanol; while at 1%(w/w) MgCl2 and 9% (w/w) bioglycerol, the azeotrope was shifted from 0.80 to 0.85 mass fraction of ethanol. Increase in relative volatilities and enhancement factors greater than one were also observed at all points below the azeotrope point.
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