Optimization of biodegradable lubricant basestock synthesis from Jatropha curcas seed oil using response surface methodology

Abstract

This study was performed to optimize reaction parameters for the transesterification reaction of jatropha methyl ester (JME) and trimethylolpropane (TMP) using response surface methodology (RSM). The effects of five-level-threefactors and their reciprocal interactions were assessed. A total of 20 individual experiments were conducted and were designed to study reaction temperature, time and JME-to-TMP molar ratio. A statistical model predicted that the highest conversion yield of jatrophabiolubricant (JBL) would be 84.38%, at the following optimized reaction conditions: 150oC, 200 min and a JME-to-TMP molar ratio of 5:1. At these optimum conditions, an average JBL yield of 82.74 ± 0.003% was achievedunder experimental conditions in three independent replicates, and this value was well within the range predicted (84.38%) by the model. The properties of JBL produced complied with International Organization for Standardization Viscosity Grade 32 (ISO VG 32) standard and could be applied as lube base-stock with minor modifications.