A mathematical model was developed to obtain the kinetic parameters of benzyl phenyl ether acidolysis with two molar sulphuric acid which is the homogenous catalyst in the system in three solvent systems, ethanol, methanol and water/ethanol. The experiments were performed in batch reactor in the temperature range between 160 and 200 °C in the nitrogen athmosphere at the initial pressure of 10 bar. Homogeneity of the mixture was pressumed, density and pressure functions were created with curve fitting of experimental data. The volumetric change due to sampling was also described. Kinetic parameters i.e. reaction rate constants and activation energies were obtained. The reaction rate was linearly proportional to the concentration of sulphuric acid and temperature dependance was described with the Arrhenius equation. The accuracy of the model was verified for the ethanol system.
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