Jatropha curcas seed oil was studied for the synthesis of trimethylolpropane based biolube basestock via chemical transesterification of Jatropha methyl ester with trimethylolpropane (TMP) using calcium hydroxide catalyst. Reactions temperatures ranged between 80 and 160°C and methyl esters to TMP mole ratios ranged between 3:1 and 7:1. Product analysis, ester groups and physio-chemical properties were obtained by gas chromatography, Fourier transform infrared spectroscopy and American Society for testing and material standard methods, respectively. Gibbs free energy indicated that the reaction was spontaneous with a second order rate constant of 1.00E-01 (%wt/ wt min C) -1 and kinetic energy of 13.57 kJ/mol. Jatropha biolubricant (JBL) had the following properties: viscosity of 39.45 and 8.51 cSt at 40 and 100°C, respectively; viscosity index of 204, pour point of -12°C and flash point of 178°C. Temperature and mole ratio were the main factors that influenced the reaction. JBL properties complied with ISO VG 32 standard and could be applied as lube basestock with minor modifications.
Synthesis of polyol ester as novel biodegradable base stock from sesame seed oil for lubricant production was conducted via chemical transesterification of sesame methyl ester (SME) with trimethylolpropane (TMP) using calcium hydroxide catalyst. The reactions were carried out under varying temperatures (80 to 160°C) and methyl esters to TMP mole ratios (3:1 to 7:1). Products analysis was performed using Gas Chromatography. Products physicochemical characteristics determined using ASTM methods were compared with ISO VG 22 standard. The process was predominated by second order reaction with rate constant of 1.40E-01 (%wt/wt min •C) −1 . The activation energy for sesame biolubricant (SBL) was 16.22 kJ/mol. Results indicated viscosities of 35.55 and 7.66 cSt at 40 and 100°C, respectively for SBL. Recorded were viscosity index, pour point and flash point of 193, -21°C and 196°C, respectively. SBL characteristics complied with ISO VG 22 standard and holds high potential as base stock for biolubricant formulation.
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