The recommended liquid–liquid equilibrium (LLE) data for 24 binary unsaturated hydrocarbon–water systems have been obtained after critical evaluation of all data (80 data sets) reported in the open literature up to the middle of 2003. A new equation was developed for prediction of the unsaturated hydrocarbon solubility. Using the predicted hydrocarbon solubilities the concentration of water in the second liquid phase was calculated. The LLE calculations were performed with the equation of state appended with a chemical term (EoSC). The recommended data were presented in the form of individual pages containing tables, all the references, and optionally figures.

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