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Investigation of the thermal degradation of the biolubricant through TG-FTIR and characterization of the biodiesel – Pequi (Caryocar brasiliensis) as energetic raw material

2019; Elsevier BV; Volume: 245; Linguagem: Inglês

10.1016/j.fuel.2019.02.006

1873-7153

Elano Nery Ferreira, Tathilene Bezerra Mota Gomes Arruda, Francisco Eduardo Arruda Rodrigues, David Thomas Duarte Arruda, Joadir Humberto da Silva Júnior, Dayanne Lopes Porto, Nágila Maria Pontes Silva Ricardo,

Biodiesel Production and Applications

This work reports the obtaining of the methyl derivative – BP1 (biodiesel) and trimethylolpropyl derivative – BP2 (biolubricant) of the pequi oil – OP, its characterization and evaluation of the thermal degradation of the trimethylolpropyl derivative through thermogravimetric analysis in conjunction with Fourier transform (TG-FTIR). Biodiesel was prepared through homogeneous methyl route and potassium hydroxide as catalyst. Biolubricant was prepared using trimethylolpropane and biodiesel (1/4 M ratio) and sodium methoxide as catalyst. Spectroscopy techniques such as infrared with Fourier transform (FT-IR), and nuclear magnetic resonance of hydrogen and carbon (NMR 1H and 13C) were used in the analysis of the products. Physicochemical properties such as acid number, iodine number, specific mass, and kinematic viscosity were also determined under international standard. Thermogravimetric analysis of the pequi biodiesel was performed in three different heating rates in order to evaluate the activation energy of the biodiesel by using the method proposed by Flynn-Wall-Ozawa, and the value found was 67.07 kJ·mol−1. For the biolubricant, the thermogravimetric analysis in conjunction with Fourier transform (TG-FTIR) provided interesting comprehension of the oxidation process for trimethylolpropyl esters, describing the steps of volatilization and combustion.