Kinetic characteristics have been determined and a mathematic model has been proposed for the alkaline hydrolysis reaction of dicyclohexyl adipate, a sterically hindered ester, under phase-transfer catalysis conditions; energy characteristics have been compared for the hydrolysis under heterogeneous (with and without a phase-transfer catalyst (PTC)) and homogeneous conditions. It has been demonstrated that a 90-95% conversion of the reactant can be achieved in the presence of 0.015-0.02 mol/L methyl trioctyl ammonium chloride (TOMAC, Aliquat-336) at 80-90A degrees C over 90-120 min.