Kinetics of polymerization of dimer fatty acids with ethylenediamine

Abstract

A generally applicable stoichiometric and kinetic model was developed for the polymerization of dimer fatty acids with ethylenediamine. The rate equations were second-order before 90% conversion and were used between 405 and 475 K. The parameters of the rate equations were determined with nonlinear regression analysis. A comparison of the model predictions and the experimental data showed that the approach was useful in predicting the polymerization kinetics. The equilibrium constant changed from 3.175 to 7.311. The frequency factor and activation energy for the forward rate constant before 90% conversion were 2,716,894 kg mol Ϫ1 min Ϫ1 and 66.7 kJ mol Ϫ1 , respectively. The equilibrium constant was independent of the temperature at frequency factor and activation energy values of 74.4 and 9.7 kJ mol Ϫ1 , respectively.

Optimum temperature profile for noncatalytic reaction to produce polyamide hot melt adhesives

“…At this time, the concentrations of acid, amine, and water were determined from the kinetic model. 11 This also included the kinetic rate constants. These procedures were carried out at all temperatures and mixing rates.…”

“…The forward and reverse rate constants and empirical parameters were obtained. 11 The process constraints should be considered in order to obtain a feasible operating condition. The aim is to minimize the time required to increase the temperature from 405 to 475 K in order to attain an optimum temperature profile without foaming.…”

“…11,12 In this model, mass balances for components were applied and empirical equations were introduced for the flow leaving the reactor and the concentration of ethylenediamine and water. The forward and reverse rate constants and empirical parameters were obtained.…”

“…In our previous work 10 we investigated the effects of the mixing rate and temperature on foaming for fatty polyamides with a catalyst. In the present work we studied the effects of the mixing rate and temperature on foaming without a catalyst.…”

Kinetics of Polymerization of Dimer Fatty Acids with Ethylenediamine After 90% Conversion

“…The kinetics of reaction up to 90% conversion were modeled. [9] In the present work, the kinetics of the polyamidation reaction of ethylenediamine and dimer fatty acid after 90% conversion were investigated. The reverse reaction, the evaporated water and the evaporated amine were included in the model.…”