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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 60oC 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.
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