Obtaining Long-Chain Esters with Lubricant Properties from Sesame Biomass (Sesamum indicum)

摘要

Biolubricants are defined like long-chain esters that have lubricant properties and can be obtained from animal or vegetal resources. In this work, the obtainment of the biolubricant by the transesterification of the sesame methyl and ethyl biodiesel in the presence of polyalcohol (trimethylolpropane - TMP) is reported. To conduct the experiment, a distillation-fractioned system was adapted. The reaction conditions were: 3/1 biodiesel/TMP molar ratio, 2 wt% of sodium methoxide catalyst, and reaction temperature and time 110 °C and 6 h respectively. Physicochemical properties like acid value, iodine value, kinematic viscosity at 40 °C, and density at 20 °C were determined. The products were characterized by infrared spectroscopy and ~1H and ~(13)C nuclear magnetic resonance (NMR). The ther-mogravimetric analysis (TGA) of the bioproducts was realized and the main thermal events were evaluated.