Synthesis and characterization of eco-friendly biolubricant from Brassica carinata oil: Parameter optimizations using response surface methodology
摘要
This research highlights the potential of the Brassica carinata as a sustainable substitute in the lubricant industry by examining its viability and effectiveness in producing biolubricants. In the present work, the biolubricant was synthesized via a double transesterification method. Initially, Brassica carinata oil undergoes transesterification with KOH and methanol to yield FAMEs. Subsequently, these FAMEs react with 2-ethylhexanol using para-toluene sulphonic acid (p-TSA) as a catalyst to produce Brassica carinata-based ethyl hexyl ester. The central composite design of the experiment was chosen to optimize and examine the effects of production variables, such as temperature, FAME-to-2-ethyl hexanol molar ratio, and catalyst concentration. The optimum bio-lubricant yield of 84.3% was achieved using a FAME-to-2-ethyl hexanol molar ratio of 1:3, a reaction temperature of 110 °C, and a catalyst concentration of 5wt%. The predicted yield agreed with the experimental value, with R2 = 0.9785, which signifies a strong relationship between the independent and dependent variables. Further, gas chromatography flame ionization detector analysis, nuclear magnetic resonance spectroscopy, and Fourier transform infrared spectroscopy of the synthesized product confirm its successful synthesis. Finally, the significant physicochemical properties of the product, such as density at 15 °C, pour point, coefficient of friction, and wear scar diameter, were found to be 0.8736 g/cm3, − 30 °C, 0.06, and 0.862 mm, respectively.
Graphical Abstract