Liquid-liquid equilibria (LLE) temperatures for systems of acetic anhydride with hexane, heptane, octane, decane, cyclohexane, and methylcyclohexane have been measured between 314 K and the upper critical solution temperature (UCST). The coexistence curves were determined visually. They have a rather horizontal top, and their symmetry depends on the size of the alkane. Interaction parameters in the framework of the DISQUAC model for anhydride (CO-O-CO)/cyclohexane contacts are reported. The same set of interaction parameters can be used to represent, LLE, vapor-liquid equilibria, and molar excess enthalpies.