Ternary liquid-liquid equilibria for mixtures of an alkane plus an aromatic compound+1,3-dimethyl-2-imidazolidinone at 298.2 K and 1 atm

The binodal curves and liquid-liquid equilibrium data are presented for mixtures of(an alkane + an aromatic compound + 1,3-dimethyl-2-imidazolidinone) at 298.2 K. The aromatic compounds were benzene, toluene, o-xylene, m-xylene, p-xylene, mesitylene, and ethylbenzene. The solubility of the aromatic compounds is higher in the alkane layer than in the 1,3-dimethyl-2-imidazolidinone (DMI) layer. The effectiveness of extracting an aromatic compound from mixtures containing an alkane using the solvent DMI is discussed in terms of the ratio of solubilities in the two phases. The results have been fitted to the Hlavaty equation, the beta -density function, and the logarithmic gamma function. The binodal curves obtained from these equations have been compared with the experimental binodal curves. The NRTL and UNIQUAC equations were used to correlate the experimental tie lines. There are no data in the literature far the mixtures discussed in this paper.