Canadian Journal of Chemical Engineering, Vol.77, No.3, 465-472, 1999
Resination and decarboxylation reactions in fusion synthesis of Ca-resinates
The reaction steps in fusion synthesis of Ca-resinates include a fast, irreversible resination reaction and a slow decarboxylation of rosin acids. The kinetics of the reactions was studied separately in a laboratory scale batch reactor. The kinetic data were obtained by acid number titrations and FTIR measurements. Resination was observed to be a fast irreversible reaction in the temperature range 190 to 235 degrees C. Rate equations for the decarboxylation reaction were derived based on plausible mechanistic reaction steps of free and solvating rosin acids. The parameters of the rate equations were estimated for syntheses at different reaction temperatures (265 to 285 degrees C) and the kinetic model was successfully applied to predict the experimental kinetics of rosin acid decarboxylation.