| dc.description.abstract | Methyl oleate synthesis was carried out through an esterification reaction between oleic acid and methanol using a Deep Eutectic Solvent (DES) catalyst with a homogeneous disperser. The DES catalyst was obtained from a mixture of choline chloride and urea that was heated simultaneously until melted, and then analyzed using an FT-IR spectrophotometer. The reaction conditions varied in this study were reaction time (1, 5, 10, 15, 20 minutes) and stirring speed (3000, 4000, 5000, 6000, 7000 rpm) with a mole ratio of oleic acid:methanol of 1:3 and a catalyst concentration of 15% (w/w). The percentage conversion of methyl oleate was determined by alkalimetric titration, the methyl oleate content was analyzed by gas chromatography, and functional group changes were observed using an FT-IR spectrophotometer. The conversion and yield of methyl oleate were obtained at 97.7% ± 0.36% and 94.82% ± 0.08% under the optimum reaction conditions of 15% (w/w) catalyst weight, 1:3 mole ratio of oleic acid:methanol, 10 minutes reaction time, and 5000 rpm stirring speed. The results of gas chromatography analysis of methyl oleate showed that the conversion of methyl ester reached 97.5969%, and FT-IR spectrophotometric analysis showed functional group changes indicating the disappearance of OH stretching vibration of carboxylic acid at 3400-2400 cm-1, supported by the appearance of C-O-C stretching absorption band at 1300-1000 cm-1 with three peaks and the largest intensity on the rightmost peak. | en_US |
