Kinetic Model Based on Eley-Rideal and Irreversible Mechanism for Multilevel Reaction of Biodiesel Synthesis

Abstract

As a new technology, an ion exchange catalyst as a heterogeneous catalyst became a good potential in exchanging the homogeneous base. A kinetic model based on Eley-Rideal mechanism and irreversible multiple reaction of biodiesel synthesis by using heterogeneous catalyst has been simulated in this work. The aim of this study is to obtain the kinetic parameter value of biodiesel synthesis with ion exchange heterogeneous catalyst. In addition, a sensitivity analysis was also studied to evaluate the effect of kinetic parameter value against the change in concentration profile of biodiesel synthesis. A kinetic model data used in this study was obtained from different experiment literatures. Based on the kinetic model of Eley-Rideal mechanism, the results of reaction rate constant values (k1-k6) were 7.87×10−3, 8.75×10−7, 1.1×10−2, 1.12×10−6, 9.14×10−3 and 5.09×10−4, respectively. In addition, for irreversible kinetic simulation, the most accurate value was showed that 1.5 mol/l of fatty acid at initial reaction has been changed after 180 minutes reaction into 1.5×10−4 mol/l of trygliceride, 2.25×10−4 mol/l of diglyceride, 2.4×102 mol/l of monoglyceride and 1.453 mol/l of biodiesel yield. The obtained values of irreversible kinetic parameter (k1-k3) were 7.86×10−3, 1.11×10−2 and 9.15×10−3, respectively.