Diesters biolubricant base oil, oleyl 9(12)-hydroxy-10(13)-oleioxy-12(9)-octadecanoate (OLHYOOD) was synthesized based on\r\nthe esterification reaction of 9,12-hydroxy-10,13-oleioxy-12-octadecanoic acid (HYOOA) with oleyl alcohol (OL) and catalyzed\r\nby sulfuric acid (SA). Optimum conditions of the experiment to obtain high yield % of OLHYOOD were predicted at ratio of\r\nOL/HYOOA of 2 : 1 mol/mol, ratio of SA/HYOOA of 0.7 : 1 mol/mol, reaction temperature 110?C, and 7 h of reaction time. At\r\nthis condition, the yield of OLHYOOD was 88.7%. Disappearance of carboxylic acid (C=O) peak has been observed by FTIR\r\nwith appearance of ester (C=O) peak at 1738 cm-1. 13C, and 1HNMR spectra analyses confirmed the result of OLHYOOD with\r\nthe appearance of carbon-ester (C=O) chemical shift at 173.93 ppm and at 4.05 ppm for 13C and 1HNMR, respectively. The\r\nphysicochemical characteristics of the OLHYOOD were also determined, which showed improved low temperature properties\r\n(PP) -62?C, viscosity index (VI) at 192 and also increased oxidative stability (OT) up to 215.24?C.
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