热动力学对比进度法(Ⅲ)——2-Ⅰ型可逆反应的热动力学研究

Reduced Extent Method in Studies of Thermokinetics (Ⅲ)——Studies on Thermokinetics of the 2-1 Reversible Reaction

本文建立了2-1型可逆反应的热动力学对比进度方程和热动力学模型。用热导式自动热量计研究了一个2-1型吸热反应体系,并对结果进行了讨论。

On the basis of previous articles, the reduced extent equation and the model of thermokinet-ics for 2-1 reversible reaction , with which both rate constants and equilibrium constant can be calculated simultaneously, are suggested in this paper. The thermokinetics for an endothermic 2-1 reversible reaction system , the acid-catalyzed esterification between acetic acid and methanol in buffer solution (pH= 1. 5), has been studied with a conduction calorimeter at 30. 0 and 40. 0℃. The rate constants of forward and backward reactions and equilibrium constants were calculated with the model in this paper , and then, activation parameters of this reversible reaction were obtained. These experimental results, by which the validation of this model has been tested, are discussed in detail.