Isothermal Vapor-Liquid Equilibrium Measurement of Isobutanol + Isooctane/N-Heptane Binary Mixtures at Temperatures Range of 303.15-323.15 K

Abstract:

The addition of alcohol as an oxygenated compound in gasoline blends may increase the vapor pressure of gasoline mixture. As a result, the study of vapor-liquid equilibrium for gasoline component and alcohol is necessary. In this study, the vapor-liquid equilibrium of isobutanol – isooctane/n-heptane blends were obtained experimentally at temperatures in the range 303.15 to 323.15 K using modified simple quasi-static ebulliometer. The apparatus was validated by comparing the vapor pressure of pure isobutanol, isooctane, and n-heptane with the published data and giving average absolute deviation (AAD) between experimental and calculated ones with magnitude less than 1.0%. The addition of isobutanol with the mole fraction range from 0.2 to 0.6 would increase the vapor pressure of the isooctane and n-heptane up to 12% and 14% respectively. The vapor pressure of binary mixtures was correlated with the Wilson, Non-random two-liquid (NRTL), and Universal quasi-chemical (UNIQUAC) equations with AAD 1.6%, 1.5%, and 1.7%, respectively for isobutanol + isooctane system and 1.8%, 1.7%, and 2.0%, respectively for isobutanol + n-heptane system. The systems studied show positive deviation from Raoult’s Law.

• Periodical: Key Engineering Materials (Volume 840)
• Pages: 501-506
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.840.501
• Online since: April 2020
• Authors: Ardika Nurmawati, Rizky Tetrisyanda, Gede Wibawa*
• Keywords: Isobutanol, Isooctane, N-Heptane, Vapor Pressure

References

[1] Y. Qian, F. Chen, Y. Zhang, W. Tao, D. Han, X. Lu, Combustion and regulated/unregulated emissions of a direct injection spark ignition engine fueled with C3-C5 alcohol/gasoline surrogate blends, Energy 174 (2019) 779–791.

DOI: 10.1016/j.energy.2019.03.021

[2] M.N.A.M. Yusoff, N.W.M. Zulki, H.H. Masjuki, M.H. Harith, A.Z. Syahir, L.S. Khuong, M.S.M. Zaharin, A. Alabdulkarem, Comparative assessment of ethanol and isobutanol addition in gasoline on engine performance and exhaust emissions, J. Clean. Prod. 190 (2018) 483–495.

DOI: 10.1016/j.jclepro.2018.04.183

[3] S.G. Poulopoulos, C.J. Philippopoulos, The effect of adding oxygenated compounds to gasoline on automotive exhaust emissions, J. Eng. Gas Turbines Power 125 (2003) 344–350.

DOI: 10.1115/1.1501076

[4] A. Kyriakides, V. Dimas, E. Lymperopoulou, D. Karonis, E. Lois, Evaluation of gasoline–ethanol–water ternary mixtures used as a fuel for an Otto engine, Fuel 108 (2013) 208–215.

DOI: 10.1016/j.fuel.2013.02.035

[5] M. Amine, E.N. Awad, V. Ibrahim, Y. Barakat, Effect of ethyl acetate addition on phase stability, octane number and volatility criteria of ethanol-gasoline blends, Egypt. J. Pet. 27 (2018) 567–572.

DOI: 10.1016/j.ejpe.2017.08.007

[6] R. Oktavian, V. Amidelsi, A. Rasmito, G. Wibawa, Vapor pressure measurements of ethanol–isooctane and 1-butanol-isooctane systems using a new ebulliometer, Fuel 107 (2013) 47–51.

DOI: 10.1016/j.fuel.2013.02.005

[7] I. Gravalos, D. Moshou, T. Gialamas, P. Xyradakis, D. Kateris, Z. Tsiropoulos, Emissions characteristics of spark ignition engine operating on lower-higher molecular mass alcohol blended gasoline fuels, Renew. Energy 50 (2013) 27–32.

DOI: 10.1016/j.renene.2012.06.033

[8] V.F. Andersen, J.E. Anderson, T.J. Wallington, S.A. Mueller, O.J. Nielsen, Vapor pressures of alcohol-gasoline blends, Energy Fuels 24 (2010) 3647–3654.

DOI: 10.1021/ef100254w

[9] M.N.A.M. Yusoff, N.W.M. Zulkifli, H.H. Masjuki, M.H. Harith, A.Z. Syahir, M.A. Kalam, M.F. Mansor, A. Azham L.S. Khuong, Performance and emission characteristics of a spark ignition engine fuelled with butanol isomer-gasoline blends, Transp. Res. D. 57 (2017) 23–38.

DOI: 10.1016/j.trd.2017.09.004

[10] E. Christensen, J. Yanowitz, M. Ratcliff, R.L. McCormick, Renewable oxygenate blending effects on gasoline properties, Energy Fuels 25 (2011) 4723–4733.

DOI: 10.1021/ef2010089

[11] J. Sheehan, Engineering direct conversion of CO2 to biofuel, Nat. Biotechnol. 27 (2009) 1128–1129.

DOI: 10.1038/nbt1209-1128

[12] R.W. Rice, A.K. Sanyal, A.C. Elrod, R.M. Bata, Exhaust gas emissions of butanol, ethanol, and methanol-gasoline blends, J. Eng. Gas Turbines Power 113 (1991) 377–381.

DOI: 10.1115/1.2906241

[13] C. Berro, A. Pneloux, Excess gibbs energies and excess volumes of 1-butanol-n-heptane and 2-methyl-1-propanol-n-heptane binary systems, J. Chem. Eng. Data. 29 (1984) 206–210.

DOI: 10.1021/je00036a033

[14] V.R. Bhethanabotla, S.W. Campbell, P–x measurements for ethanol-n-heptane-isobutanol at 303.15 K, Fluid Phase Equilib. 62 (1991) 239–258.

DOI: 10.1016/0378-3812(91)80013-l

[15] J.H. Oh, I.C. Hwang, S.J. Park, Fluid phase equilibria isothermal vapor–liquid equilibrium at 333.15 K and excess molar volumes and refractive indices at 298.15 K for the mixtures of di-methyl carbonate, ethanol and 2,2,4-trimethylpentane, Fluid Phase Equilib. 276 (2009) 142–149.

DOI: 10.1016/j.fluid.2008.11.001

[16] S. Bernatová, J. Pavlícek, I. Wichterle, Isothermal vapor-liquid equilibria in the binary and ternary systems composed of 2,2,4-trimethylpentane, 2-methyl-1-propanol, and 4-methyl-2-pentanone, Fluid Phase Equilib. 307 (2011) 66–71.

DOI: 10.1016/j.fluid.2011.05.011

[17] A. Belabbaci, R.M. Villamanan, L. Negadi, C.M. Martin, A.A. Kaci, M.A. Villamanan, Vapor-Liquid Equilibria of Binary Mixtures Containing 1-Butanol and Hydrocarbons at 313.15 K, J. Chem. Eng. Data. 57 (2012) 114–119.

DOI: 10.1021/je200840e

[18] G.M. Wilson, Vapor-liquid equilibrium. XI. A new expression for the excess free energy of mixing, J. Am. Chem. Soc. 86 (1964) 127–130.

DOI: 10.1021/ja01056a002

[19] H. Renon, J.M. Prausnitz, Local compositions in thermodynamic excess functions for liquid mixtures, AIChE J. 14(1) (1968) 135–144.

DOI: 10.1002/aic.690140124

[20] D.S. Abrams, J.M. Prausnitz, Statistical thermodynamics of liquid mixtures: A new expression for the excess gibbs energy of partly or completely miscible systems, AIChE J. 21 (1975) 116–128.

DOI: 10.1002/aic.690210115

[21] G. Wibawa, A. Mustain, M.F. Akbarina, R.M. Ruslim, Isothermal vapor−liquid equilibrium of ethanol + glycerol and 2‑propanol + glycerol at different temperatures, J. Chem. Eng. Data. 60 (2015) 955–959.

DOI: 10.1021/je501019y

[22] R.P. Anugraha, A. Wiguno, A. Altway, G. Wibawa, Vapor pressures of diethyl carbonate + ethanol binary mixture and diethyl carbonate + ethanol + isooctane/toluene ternary mixtures at temperatures range of 303.15–323.15 K, J. Mol. Liq. 264 (2018) 32–37.

DOI: 10.1016/j.molliq.2018.05.049

[23] R.P. Anugraha, A. Altway, G. Wibawa, Measurement and correlation of isothermal binary vapor−liquid equilibrium for diethyl carbonate + isooctane/n‑heptane/toluene systems, J. Chem. Eng. Data. 62 (2017) 2362–2366.

DOI: 10.1021/acs.jced.7b00236

[24] B.E. Poling, J.M. Prausnitz, J.P. O'connell, The Properties of Gases and Liquids, 5th ed., Mc Graw Hill, New York, (2001).

[25] J.A. Barker, Determination of activity coefficients from total pressure measurements, Aust. J. Chem. 6 (1953) 207–210.