Abstract
The reaction rate of transesterification of dimethyl terephtalate by ethylene glycol was investigated in the presence of some organic acids. The reaction rate decreased only slightly in the presence of monocarboxylic acids, usually forming anions of used catalysts; however the decreasing reaciton rate is very strong in presence of dicarboxylic acids. These acids can be present in ethylene glycol (oxalic acid), dimethyl terephtalate (terephtalic acid), or in any modifier. The monoester of terephtalic acid has a similar influence. The decrease of rate constant of a second order reaction during the reaction can be explained by the forming of carboxylic groups in the transesterification.
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