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Vapor–liquid equilibrium (VLE) at P = 50.0 and 100.0 kPa have been determined for the binary system (ZE-2-methyl-2-butenenitrile + 2-methyl-3-butenenitrile). To analyze the binary data, the vapor pressures of ZE-2-methyl-2-butenenitrile and 2-methyl-3-butenenitrile were determined, and the experimental values were correlated using an Antoine-type equation. The vapor pressures predicted by the Antoine equation had average relative deviations of 1.964% and 0.907% from the experimental values for ZE-2-methyl-2-butenenitrile and 2-methyl-3-butenenitrile, respectively. Thermodynamic consistency tests were performed for all of the VLE data using the point test, area test, and direct test, and all of the data passed the three tests. The VLE binary data were all calculated from activity coefficients correlated using the Wilson and NRTL models. The model parameters were obtained, and all of the models represent the experimental values quite well.

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