Liquid–liquid equilibria of ternary systems containing alkane, methanol, and ether

Tie-line data of eight type I ternary systems consisting of alkane (heptane, octane, nonane or decane), methanol, and ethers (methyl tertiary butyl ether or diisopropyl ether) are reported at 25°C. The UNIFAC group contribution method is used to predict or correlate the observed ternary liquid–liquid equilibrium (LLE) data. It is found that the UNIFAC with original group-interaction parameters developed for LLE could not provide a good prediction. Therefore, the UNIFAC group-interaction parameters were adjusted to give better correlation performance.