Kinetic Study of Rubber Seed Oil Epoxidation Using Tungstate-based Catalyst

Abstract

Abstract: The thermodynamic properties of the epoxidation of rubber seed oil (RSO) and modified rubber seed oil (eRSO) using tungstate-based catalyst were determined by performing the epoxidation for one hour at three different temperatures. The rate constants of these epoxidations ranged from 0.57.10^-2 to 1.01.10^-2 l.mol^-1.s^-1 with RSO and 0.97.10^-2 to 1.76.10^-2 l.mol^-1.s^-1 with eRSO, and the activated energies of reaction were 6.2 and 6.6 kcal.mol^-1, respectively. The enthalpy ΔH was positive, which indicated that the epoxidation process was an endothermic reaction, but as the free-energy ΔF was also positive, there was a specific temperature at which the epoxidation process was the most effective. The experiment results show that 60^oC was the most suitable temperature for epoxidation of both RSO and eRSO with the conversion of 91.37% (RSO) and 94.87% (eRSO), the yield of 75.06% (RSO) and 89.56% (eRSO), and the selectivity was 0.82 (RSO) and 0.94 (eRSO).

Keywords: Epoxidized rubber seed oil, kinetic, tungstate-based catalyst.

References

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