高等化学工程学报

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Experimental and Theoretical Study of Co-Solvent Effect in Alkaline Hydrolysis of Diethyl Pathalate Ester

Anil Kumar Singh*

The rate constant of reaction odf iethyl phthalate has been determined volumetrically using aqueous solution of ethanol covering range of 30% to 70% (v/v) at different temperature (20℃ to 40℃). Whatever the experimental condition used, the reaction followed second order rate constant which decreases with increase of solvent composition. The effect of the solvent on rate and mechanism has been studied in term of solvation and desolation concept. The relation between changes in dielectric constant due to variation of reaction mixture and change in specific rate constant has been explained on the basis of electrostatic and non-electrostatic contribution of solvent mixture. Calculated value of iso-composition activation energy is found to be increases with increase of solvent composition. The thermodynamic parameters (ΔG*, ΔH* and ΔS*) has been determined with help of Wynne Jone and Eyring equation which show the great dependency on solvent composition.