Banca de QUALIFICAÇÃO: THAIZA DOS SANTOS QUEIROZ

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : THAIZA DOS SANTOS QUEIROZ
DATA : 14/03/2023
HORA: 14:00
LOCAL: https://meet.google.com/zfw-nifj-kqg
TÍTULO:

Acetylation of Glycerol by Nb-SBA-15 to Obtain Triacetin.

PALAVRAS-CHAVES:

Glycerin; Biodiesel; Heterogeneous catalysis.

PÁGINAS: 36
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Biodiesel is a biodegradable fuel derived from renewable sources and the most promising substitute for fossil fuels. The production of biodiesel from triglycerides has glycerol as a co-product, for every 90 m3 of biodiesel produced by the transesterification reaction, 10 m3 of glycerol are generated, a product used mainly in the cosmetics and pharmaceuticals industry. With the growth of biodiesel production, these industries have become unable to absorb the high volume of crude glycerol generated, so there are high levels of glycerol without proper disposal. Due to this, other alternatives for the use of glycerol have been studied, one of them being its use as an additive in fuels, including biodiesel, in which it undergoes transformation processes, with emphasis on the production of triacetin by the glycerol acetylation reaction . Therefore, this work aims to obtain triacetin from glycerol via acetylation reaction using niobium-based catalysts supported on SBA-15. For this, an exception of Nb-SBA-15 was used in the acetylation process with proportions of 15 and 30% of niobium, emitted in the catalyst bank of the Laboratory of Environmental Catalysis and Materials - LACAM. The acetylation was carried out with a molar ratio of 6:1 glycerol/acetic acid and addition of catalyst in the proportion of 5% of the mass of glycerol used. Soon after, using the same proportion of catalyst, the products received in the first reaction were acetylated. From characterizations using gas chromatography coupled to the Flame Ionization Detector (FID), it was possible to observe yields of approximately 60 and 70% for Nb15SBA-15, in the first and second reactions, respectively, and of approximately 75 and 80% for the Nb30SBA-15. In relation to selectivity, Nb15SBA-15 and Nb30SBA-15 presented respectively 85.50 and 100% of triacetin. The results obtained show that the reactions presented good yields and the catalysts presented high selectivity for triacetyl. Thus, the one used in the research is shown as an excellent alternative for the valorization of glycerol, demonstrating both environmental and economic advantages.

MEMBROS DA BANCA:
Presidente - 7961 - ANNE GABRIELLA DIAS SANTOS CALDEIRA
Externa à Instituição - ARUZZA MABEL DE MORAIS ARAUJO - UFRN
Interno - 13136 - LEANDRO BEZERRA DE LIMA