Banca de QUALIFICAÇÃO: ALDO MIRO DE MEDEIROS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ALDO MIRO DE MEDEIROS
DATA : 07/07/2016
HORA: 09:00
LOCAL: AUDITÓRIO DO PPGEQ
TÍTULO:

Chemical interesterification cotton oil with methyl acetate assisted by ultrasound 

PALAVRAS-CHAVES:

Interesterification, biodiesel, kinetic, star experimental design and Gossypium Hirsutum L.

PÁGINAS: 90
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

In this paper we present a study of the interesterification process of cottonseed oil with methyl acetate using potassium methylate as a catalyst in the presence of ultrasonic waves. In order to better understand the important process variables, we used an experimental design star type, a response surface methodology and statistical techniques. The experiments were carried out with molar ratio ranging from 1: 8 to 1:24, percentage of catalyst from 0.1 to 1.3 wt%, amplitude of the ultrasonic nozzle 30 to 90% (180 to 540W) and vibration pulse 50 to 90%. In planning, the temperature used was 50 ° C, the reaction time 30 min and the ultrasonic nozzle diameter of 28 mm. We used the Statistica 8.0 software to optimize the process variables, where the molar ratio was optimized in 1: 14.87, catalyst concentration of 1.17%, amplitude of the ultrasonic nozzle 67.64% and vibration pulse 67.30%. For the optimized by experimental design (98.12% of triglyceride conversion), we performed a kinetic study of the reaction at temperatures of 30, 40 and 50 ° C. The reaction was performed with 2nd-order kinetics in that the rate constant of the reaction increases with increasing temperature. The activation energy was quantified in 79.129 kJ / mol. Finally, we conducted a comparative study of the production of biodiesel interesterification in the presence of ultrasonic waves, with a conventional method (mechanical stirring), with a significant increase of 13% of triglyceride conversion with the use of ultrasonic waves compared to a conventional methodology.

MEMBROS DA BANCA:
Externo à Instituição - ANDERSON ALLES DE JESUS - UFRN
Presidente - 348100 - ELISA MARIA BITTENCOURT DUTRA DE SOUSA
Interno - 347567 - MARCIA MARIA LIMA DUARTE