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Title: Cibulka correlation for ternary excess molar volumes for [MOA]⁺[Tf₂N]⁻ at different temperatures
Authors: Tywabi, Zikhona 
Issue Date: 20-Aug-2012
In this work, the binary and ternary excess molar volumes have been calculated from the
density, ρ, measurements using an Anton Paar (DMA 38) vibrating tube digital densimeter.
One component of the ternary systems studied was an ionic liquid. The ionic liquid used is
methyl trioctylammonium bis(trifluoromethylsulfonyl)imide [MOA]+[Tf2N]-. Binary excess
molar volumes were obtained for (1-butanol + ethyl acetate) and (2-butanol + ethyl acetate)
systems at T = (298.15, 303.15, and 313.15) K. Ternary excess molar volumes were obtained
for the mixtures {[MOA]+[Tf2N]- + 2-propanol or 1-butanol or 2-butanol + ethyl acetate} at T
= (298.15, 303.15, and 313.15) K.
The Redlich-Kister equation was fitted to the calculated binary excess molar volume data to
obtain the fitting parameters which were used to calculate the partial molar volumes at
infinite dilution. The calculated partial molar volume was used to better understand the
intermolecular interactions of each component at infinite dilution. The Redlich-Kister
parameters were also used in the Cibulka equation and the Cibulka equation was used to
correlate the ternary excess molar volume data to give the fitting parameters.
The binary excess molar volumes,VmE , for the (1-butanol + ethyl acetate) and (2-butanol +
ethyl acetate) are positive at each temperature over the entire composition range. At high
mole fractions of the alcohol for the binary systems (2-propanol or 1-butanol or 2-butanol +
ethyl acetate), VmE is positive again, similar to the Cibulka ternary correlation. The positive
V E m values are due to the breaking of intermolecular interactions in the pure components
during the mixing process. The ternary excess molar volume,V E
123 , values are negative for all mole fractions. The
negative values are due to a more efficient packing and/ or attractive intermolecular
interactions in the mixtures than in the pure liquid. There is also a contraction in volume
which can be attributed to electron-donor-acceptor type interactions between the ionic liquid
and 2-propanol or 1-butanol or 2-butanol as well as ethyl acetate.
Dissertation was submitted in fulfilment of the academic requirement for the Masters
Degree in Technology: Chemistry, Durban University of Technology, Durban, South Africa, 2011.
Appears in Collections:Theses and dissertations (Applied Sciences)

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