The Selectivity of Tungstate-based Catalyst in Epoxidation of Modified and Non-modified Rubber Seed Oil

Abstract

Abstract: The study investigated the selectivity of tungstate-based catalyst in the epoxidation of rubber seed oil and modified rubber seed oil by two methods: The titration method was performed according to the ASTM standard and the H-NMR method was based on the peaks of the three different standard groups. The catalyst selectivity of the epoxidation reaction of modified rubber seed oil was much higher than that of non-modified rubber seed oil for both methods. The average catalyst selectivity obtained by using H-NMR method in the modified rubber seed oil epoxidation reaction was equal to that of the titrimetric method, while the selectivity of the rubber seed oil epoxidation reaction was 11% lower than that of the titrimetric method. For both types of oil, the difference between the catalytic selectivity obtained by using the titration method and by using protons in group α-CH₂-(C=O)-O- as the standard peak, was the smallest and when the proton in group -CH₃ was used as the standard peak, the difference in selectivity was the biggest.

Keywords: Selectivity, tungstate-based catalyst, H-NMR.

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