Banca de DEFESA: JONEI MARQUES DA COSTA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JONEI MARQUES DA COSTA
DATA : 21/10/2021
HORA: 09:00
LOCAL: videoconferência na plataforma RNP (sala PEI-UFBA)
TÍTULO:

PRODUCTION OF BIODIESEL CATALYSED BY FUNCTIONALIZED BENTONITE.

PALAVRAS-CHAVES:

Clay. Catalysis. Transesterification. Montmorillonite. Vegetable oil.

PÁGINAS: 179
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Produção
RESUMO:

Cotton oil is one of the main feedstocks for biodiesel production in Brazil and is traditionally
produced by transesterification with methanol and homogeneous catalyst. However, heterogeneous
catalysts can be used for transesterification of oil and fat with alcohols. A brief review shows there
are many studies of the transesterification with methanol and homogeneous catalyst and up to now
little attention has been paid to ethylic transesterification of cotton oil using heterogeneous catalysts,
notably a montmorillonite clay catalyst. The aim of this study was to examine the effects of
temperature and concentretion the of some potassium salts in the synthesis of montmorillonite
catalysts for methylic transesterification of cotton oil. The aim of this study was to examine the effects
of temperature and the concentration of some potassium salts on the synthesis of montemorilonite
catalysts for methyl and ethyl transesterification of cotton oil. The influence of the molar ratio, the
concentration of the catalyst and the reaction temperature on the efficiency of the reaction was also
investigated. Montemorilonite and catalysts were characterized by X-ray diffraction, X-ray
fluorescence spectroscopy, infrared spectroscopy, X-ray excited photoelectron spectroscopy,
thermogravimetric analysis and electron microscopy. The oil phases were analyzed by infrared
spectroscopy and gas chromatography, as well as some analyzes for the specification of the biodiesel
parameters. The results suggest that potassium fluoride functionalized bentonite is able to catalyze
the ethyl transesterification of cotton oil at 120°C and produce an oily phase with the characteristics
of a biodiesel. Other clay catalysts functionalized by potassium carbonate, potassium hydroxide and
potassium fluoride, previously activated at 400 or 700°C, are effective as a catalyst for methyl
transesterification at a reaction temperature of 70°C and exhibit low efficiency in ethyl
transesterification at low temperatures. The clay catalysts functionalized with sodium fluoride,
sodium fluorosilicate, potassium bisulfate and potassium sulfate in all synthesis conditions did not
show efficiency for ethyl or methyl transesterification, such result can be attributed to the high acidity
of these catalysts. The industrial application of bentonite clay functionalized by potassium fluoride
as a catalyst for ethyl transesterification of cotton oil for the production of biodiesel is promising and
an attractive research field.

MEMBROS DA BANCA:
Externo à Instituição - FRANCISCO ROLANDO VALENZUELA DIAZ
Externa à Instituição - NÚBIA MOURA RIBEIRO
Externo à Instituição - ROBERTO JORGE DE CAMARA CARDOSO
Interno - 286723 - EDNILDO ANDRADE TORRES
Presidente - 287167 - LUIZ ROGERIO PINHO DE ANDRADE LIMA