Study on Synthesis Kinetics of Nylon Sour Dimethyl Ester

The dimethyl adipate was synthesized through esterification reaction with nylon sour and methano using toluene-psulfonic acid as catalyst. Based on the acid value change of reaction mixture, the reaction was traced and the reaction rule was studied, and the kinetics model was established with the water no diversion. By kinetic calculation, it was obtained that the overall order of positive reaction and side reaction was 1.3 on 55~65℃, the apparent activation energy to positive reaction and side reaction was 62910J/mol and 47680J/mol, the frequency factor to positive reaction and side reaction was 5.73×106、1.26×104, the positive rate constant and side rate constant varied with the level of catalyst,they were both accord with exponential relationship of 0.3. The model values consistent with the experimental value, showed the correctness of the model.