Banca de DEFESA: EMANOELLE PEIXOTO ALENCAR DO NASCIMENTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : EMANOELLE PEIXOTO ALENCAR DO NASCIMENTO
DATE: 09/07/2025
TIME: 09:00
LOCAL: https://meet.google.com/vzp-xnza-orn
TITLE:

EVALUATION OF THE EFFECT OF ALKALINE SALTS TO INCREASE THE CATALYTIC EFFICIENCY OF QUICKLIME IN THE SYNTHESIS OF METHYL BIODIESEL

KEY WORDS:

biodiesel, CaO, quicklime, alkaline salts, methanolysis

PAGES: 77
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Analítica
SUMMARY:

Biodiesel is a renewable alternative to fossil diesel and has been progressively incorporated into the energy matrix. Its synthesis mainly occurs through the transesterification reaction of vegetable oils with short-chain alcohols, in the presence of catalysts. Homogeneous basic catalysts, such as NaOH and NaOCH3, are widely used, but some drawbacks have motivated the study of heterogeneous catalysts, such as CaO. This work investigates the influence of alkaline salts on the conversion of biodiesel synthesis catalyzed by quicklime. The reaction was carried out at 60 °C for 120 minutes, with and without the additives CH3CO2Na, CH3CO2K, NaCl, and KCl A total of 45.0 g of soybean oil, 1.6 g of quicklime (both calcined and uncalcined), 3.0 mmol of additive, and a molar ratio of methanol:oil of 4:1 were used. A factorial design 2³ with a central point, using CH3CO2Na and calcined lime, evaluated the effects of reaction time (60 and 180 min), additive percentage (0.17 %m/m and 0.93 %m/m), and catalyst percentage (1.7 %m/m and 5.3 %m/m). The conversion with uncalcined lime was 45%, increasing to 93.7%, 91.3% and 62.0% with the additives CH3CO2Na, CH3CO2K, and NaCl, respectively. The addition of KCl reduced the conversion to 17%. Calcining the lime increased the conversion to 72%. With the calcined lime and additives, the conversions were 92.4% (CH3CO2Na), 93.5% (CH3CO2K), 93.7% (NaCl), and 90.2% (KCl). It was observed, through the conversions, that CH3CO2Na and CH3CO2K allow to forgo calcination. The conversions obtained in the factorial design varied from 77.59% to 92.95%. The three main effects and the time*additive and time*catalyst interactions were statistically significant (α = 0.05). The maximum conversion (92.95%) was achieved with 5.3 %m/m of catalyst and 0.93 %m/m of additive, after 60 minutes of reaction, at a molar ratio of methanol:oil 4:1.

COMMITTEE MEMBERS:
Presidente - 2626414 - JOSE GERALDO ROCHA JUNIOR
Interno - 1144471 - IDIO ALVES DE SOUSA FILHO
Externo à Instituição - LUIZ FERNANDO SILVA CALDAS - IFRJ