Vapor pressure measurements of ethanolaisooctane and 1-butanolaisooctane systems using a new ebulliometer

A new, simpler ebulliometer has been developed to accurately measure the vapor pressure of ethanolaisooctane and 1-butanolaisooctane systems at various mixture compositions. The reliability of the experimental apparatus was validated by comparing the experimental data with published data for pure is...

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Bibliographic Details
Published in:Fuel (Guildford) 2013-05, Vol.107, p.47-51
Main Authors: Oktavian, Rama, Amidelsi, Vika, Rasmito, Agung, Wibawa, Gede
Format: Article
Language:English
Subjects:
Correlation
Deviation
Elevated
Ethanol
Ethyl alcohol
Fuels
Isooctane
Vapor pressure
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Summary:A new, simpler ebulliometer has been developed to accurately measure the vapor pressure of ethanolaisooctane and 1-butanolaisooctane systems at various mixture compositions. The reliability of the experimental apparatus was validated by comparing the experimental data with published data for pure isooctane and ethanol and ethanolaisooctane system. Our data were in good agreement with the published data, with a deviation of less than 1.9%. The vapor pressure of an ethanolaisooctane mixture was initially elevated by the addition of ethanol until the ethanol concentration reached 0.3 mass fractions, then dropped at concentrations above 0.7 mass fractions. For a 1-butanolaisooctane system, the vapor pressure decreased with increasing 1-butanol concentrations. The experimental data were correlated using the Wilson, Non-Random Two-Liquid (NRTL), and Universal Quasi-Chemical (UNIQUAC) activity coefficient models with an average absolute deviation in the vapor pressures of 3.5%, 3.3%, and 6.1%, respectively.
ISSN:0016-2361
DOI:10.1016/j.fuel.2013.02.005