Comparative Study of The Kinetics of Base Catalysed Hydrolysis of Methyl Salicylate in Aquo-Ethylene Glycol, Aquo-n-propyl Alcohol and Aquo-Tertiary Butyl Alcohol

Abstract

The rate of alkali catalysed hydrolysis of methyl salicylate in aquoethylene glycol, aquo-n-propyl alcohol and aquo-tertbutyl alcohol of composition ranging from 10% to 40% of ethylene glycol, n-propyl alcohol and tertiary butyl alcohol respectively at temperature varying from 15 to 35°C has been studied. The rate constant decreases with increasing percentage of ethylene glycol, n-propyl alcohol and tertiary butyl alcohol respectively in water. The isocomposition activation energy E_c was calculated using Arrhenius equation and other thermodynamic parameters such as change in enthalpy of activation ΔH*, change in free energy of activation ΔG*, and change in entropy of activation ΔS* were evaluated using Wynne Jones and Erying equation. The variation in rates and thermodynamic parameters of the reactions in the aquo co-solvent media has been compared with each other.