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MEASUREMENT OF VAPOR-LIQUID EQUILIBRIUM FOR ETHANOL-WATER-CALCIUM NITRATE AT NORMAL PRESSURE

LEAL, C.; MAHIAS, G. B.; MAGALHÃES, W. A. P.; MENDES, M. F.;

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This paper aims to obtain experimental data on vapor-liquid equilibrium of the ethanol-water-calcium nitrate at atmospheric pressure, as well as the validation of the UNIFAC thermodynamic model. Several solvents have been studied to break the azeotrope of ethanol-water systems, including salts, organic solvents and ionic liquids. The choice of salt is due to the importance of searching for other cheaper solvents to separate ethanol from water. Thus, the data were measured using an Othmer-type ebulliometer and composition analysis was obtained using a digital densimeter. Salt was used at concentrations of 0.06 and 0.15 mole, and 30% (w/w) (dehydrated salt), to compare the behavior between the VLE with and without the salts. All the experiments were done in triplicate. An enrichment of ethanol in the vapor phase was observed, indicating the breaking of the azeotrope. Furthermore, the average relative deviation between the experimental measurements of calcium nitrate dehydrated 30% (w/w) and the predicted values by the model was less than 7% for the vapor phase composition and for the temperatures, therefore validating the model. This study showed that calcium nitrate is a solvent that can be used for the production of anhydrous ethanol with a high purity with low cost.

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DOI: 10.5151/chemeng-cobeqic2015-022-31768-240556

Referências bibliográficas
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Como citar:

LEAL, C.; MAHIAS, G. B.; MAGALHÃES, W. A. P.; MENDES, M. F.; "MEASUREMENT OF VAPOR-LIQUID EQUILIBRIUM FOR ETHANOL-WATER-CALCIUM NITRATE AT NORMAL PRESSURE", p. 647-652 . In: Anais do XI Congresso Brasileiro de Engenharia Química em Iniciação Científica [=Blucher Chemical Engineering Proceedings, v. 1, n.3]. ISSN Impresso: 2446-8711. São Paulo: Blucher, 2015.
ISSN 2359-1757, DOI 10.5151/chemeng-cobeqic2015-022-31768-240556

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