Collect. Czech. Chem. Commun. 1989, 54, 608-615

Esterification kinetics of phenol with phosphoryl trichloride

Miroslav Maguraa, Ján Vojtkob, Eva Zemanováa, Alexander Kaszonyib and Ján Ilavskýb

a Chemko, 072 22 Strážske
b Department of Organic Technology, Slovak Technical University, 812 37 Bratislava


The liquid-phase esterification kinetics of phenol with POCl3 has been studied at isothermal conditions within the temperature interval from 90 to 110 °C. The esterification rate constants of the first, second, and third esterification steps and the activation energies of these steps have been calculated. The given system of competitive consecutive reactions can be described by a system of differential equations which has been solved by the Gauss-Newton optimization method of non-linear regression in the Marquardt modification. In the sequence of the first, second, and third step the esterification rate constants have been found to gradually decrease, whereas the activation energies uncrease in the same sequence.