Banca de DEFESA: ADRIANA KARLA VIRGOLINO GUIMARÃES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ADRIANA KARLA VIRGOLINO GUIMARÃES
DATA : 11/12/2018
HORA: 08:30
LOCAL: AUDITÓRIO NUPEG
TÍTULO:

Study of oiticica oil (Licania rigida, Benth) for biodiesel synthesis and evaluation of its  properties as fuel.

PALAVRAS-CHAVES:

Oiticica oil, biodiesel, oil extraction, transesterification, thermogravimetric analysis, oxidative stability analysis.

PÁGINAS: 280
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Changes in the climate resulted from the burning of fossil fuels claims to an urgent modification in the energy matrix. Biodiesel is one of the alternatives proposing the replacement of mineral diesel. The aim of this work is the study of biodiesel production from oiticica oil by a methylic transesterification through homogeneous catalysis (NaOH and KOH). Oiticica has a high oil content in its almond (> 60%). Oiticica seeds were selected and classified according to the year (2015 and 2017), harvest and the degree of maturation (green - V, dry - SS, mature - M and green without epicarp - SV). Oil was extracted by mechanical pressing (continuous and discontinuous). The chemical composition of oiticica oil and biodiesel was determined by Gas Chromatography coupled to Mass Spectroscopy (GC-MS). The synthesis study was carried out under various reaction conditions: temperature (between 32 and 80 °C), reaction time (2 to 5 h), oil/alcohol molar ratio (1:6 - 1:20), and mass percentage of catalyst (0.5 to 2.0%). The most favorable conditions were obtained with molar ratio of 1:9 (O: A), 32 °C, 1% KOH/MeOH catalyst and 4 h for green oiticica oil without epicarp of the second harvest of 2017 (OSV2). The best physico-chemical results obtained from the biodiesel syntheses showed: 0.34 mg KOH/g (acid number), 922.6 kg/m3 (density) and 8.647 mm2/s (kinematic viscosity). The conversion of the esters was determined by thermogravimetric analysis (TG/DTG) and by TGA-FTIR (thermogravimetric analysis coupled with infrared spectrophotometry) by spectra the presence of esters only for B100. Under optimized conditions, the maximum purity was 96.1%, in 4 h 15 min, with 1.27% of the KOH/MeOH catalyst at 32 °C. The oxidative stability of B100 was 0.43 h, indicating a short time to maintain in storage due to susceptibility to biodiesel oxidation. The formulated blends (B10 to B50) showed an acid value above the limit only for B50. For density and kinematic viscosity, all results were within the range specified by the ANP. The flash point for B100 (183 ° C) and B10 (58 ° C) was well above the specified limit, which demonstrates the energy potential of these biofuels. It was concluded that the reactive conditions studied were feasible for the production of oiticica biodiesel. It was also indicated the mixture with other biodiesels due to the viscosity and the use of antioxidants, in order to improve the thermooxidative stability of the biodiesel of oiticica.

MEMBROS DA BANCA:
Interno - 1670497 - HUMBERTO NEVES MAIA DE OLIVEIRA
Interno - 1149554 - OSVALDO CHIAVONE FILHO
Externo ao Programa - 2140818 - AMANDA DUARTE GONDIM
Externo à Instituição - ANDERSON ALLES DE JESUS - UFRN
Externo à Instituição - LEILA MARTINS DA COSTA QUINTEIRO
Externo à Instituição - SAULO HENRIQUE GOMES DE AZEVÊDO - IFRN