Banca de DEFESA: TALITA KÊNYA OLIVEIRA COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : TALITA KÊNYA OLIVEIRA COSTA
DATE: 19/03/2021
TIME: 07:00
LOCAL: SALA VIRTUAL
TITLE:

Evaluation of conversion of soybean oil in biodiesel using short chain alcohols

KEY WORDS:

Biodiesel, butanol, kinetic constants, homogeneous catalyst

PAGES: 129
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Biodiesel is one of the alternatives in reducing environmental impacts as it is a fuel derived from renewable raw materials such as vegetable oils and animal fats. It can be obtained through the transesterification reaction between an alcohol and triglycerides in the presence or not of a catalyst, having as product an ester, which is biodiesel, and glycerin. The objective of this work was to evaluate the use of short chain alcohols in the transesterification reaction of soybean oil, using a homogeneous base catalyst (potassium hydroxide), obtaining as a result the model for the conversion of the reaction and the reaction kinetics for the biodiesel made with butanol. The transesterification reactions were carried out in a jacketed glass reactor, with a coupled condenser and a heating bath. Initially, reactions were carried out with different alcohols varying the molar ratio alcohol: oil to biodiesel using methanol, ethanol, 2-propanol and butanol as alcohol, soon after a factorial design 2³ was made with butanol in the reaction and with the following conditions: alcohol: oil ratio of 4:1 to 8:1, 1 to 2%, 1 to 2 hours and 65 ° C. To obtain the kinetic curve, samples of the reaction were taken between the initial time and 60 minutes. For all samples, density and viscosity were analyzed and their conversions were measured using thermogravimetric analysis and gas chromatography. In the density analysis, of the reactions of the factorial design, it varied between 889.41 kg/m³ and 850.18 kg/m³, whereas for the viscosity it varied between 11.10 cSt and 3.10 cSt. By increasing the conversion to ester, the density and viscosity decreased in their values. For the conversion analysis, the four types of alcohol with a 10:1 molar ratio were found: methanol 99.28%, ethanol 81.72%, 2-propanol 7.50% and butanol 49.74%. For planning with butanol, the optimum point occurred with an 8:1, 2% mass ratio of catalyst, for two hours, where it obtained 76.24% conversion. With the model obtained by factorial design, it was found that the three factors analyzed were significant, with an average error between the predicted and experimental values of 2.3%. The reaction was shown to be of second order with a kinetic constant of 3x10^-5 min^-1. Thus, it can be concluded that the biodiesel produced with butanol obtained conversion values consistent with the works found in the literature, making this alcohol an alternative in the production of biofuel due to renewable sources and better lubricity of the fuel.

BANKING MEMBERS:
Presidente - 1308273 - EDUARDO LINS DE BARROS NETO
Externo à Instituição - FRANCISCO WENDELL BEZERRA LOPES - UnP
Externo ao Programa - 1566922 - LINDEMBERG DE JESUS NOGUEIRA DUARTE