Imidazole and 2-chloropyridine were used as model molecules to investigate the acid hydrolysis kinetics of agrochemicals in high-temperature water in a batch reactor system at 28MPa. Pseudo-first-order hydrolysis reaction rate constants for the acid hydrolysis of Imidazole and 2-chloropyridine were determined in the temperature ranges 200600 and 400575 degrees C, respectively, at 28MPa. Rate constants for both compounds increased with temperature with a local maximum observed at around 400 degrees C due to changes in the physical properties of the solvent. Imidazole and 2-chloropyridine conversions of 0.95 and 0.99999 were respectively attained at the highest temperature after 30min of reaction. (c) 2012 Canadian Society for Chemical Engineering