The global consumption of raw materials has shifted from the use of non-renewable materials to renewable materials. Studies on greener epoxidation by using vegetable oils to produce eco-friendly epoxides have also increased. In this study, the epoxidation of palm oleic acid was carried out by in situ generated performic acid. Fourier transform infrared spectroscopy of the products was conducted to confirm the success of the epoxidation. Lastly, a mathematical model was developed using the numerical integration of the 4 th order Runge-Kutta method, and the results showed good agreement between the simulation and experimental data, which validates the kinetic model.
Aim of this research is to investigate the ability of synergist system of D2EHPA-isodecanol to recover gold from thiourea leaching solution. Synergistic extraction was introduced to replace single extraction due to enhance the extraction efficiency of heavy metal such as gold, silver copper and etc. In order to improve extraction efficiency, di-(2ethylhexyl) phosphoric acid (D2EHPA) was mixed with isodecanol to provide synergistic effect together with leaching solution which thiourea. From the synergist extraction system. The optimum pH is at 2.5 which in acidic range producing the highest yield of %E of 94.6%. It was found that synergistic D2EHPA-isodecanol extraction is successful as it yield %E of 99.4% if the ratio aqueous: organic is set to 1:2.
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