Banca de QUALIFICAÇÃO: CLÁUDIA BEZERRA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CLÁUDIA BEZERRA SILVA
DATE: 16/10/2020
TIME: 08:00
LOCAL: VIRTUAL
TITLE:

USE OF SURFACTANTS IN METHYL TRANSESTERIFICATION OF SOYBEAN OIL CATALYZED BY CALCIUM OXIDE FROM CHICKEN EGG-SHELLS

KEY WORDS:

Biodiesel, NP7EO, conversion, experimental factorial design.

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Biodiesel is considered an alternative source of fuel, that consists of fatty acid alkyl ester. Industrially, transesterification is the route most used to produce it, that is a chemical reaction between triglycerides and alcohol, with a homogeneous or heterogeneous catalyst. Surfactants are substances that have at least two parts, one lyophilic, and the other lyophobic, and are characterized by their tendency to absorb surfaces and interfaces. Thus, this work aims to evaluate the use of surfactant Nonylphenol ethoxylated in a transesterification reaction of soybean oil with methanol, catalyzed by the calcium oxide (CaO) synthesized from chicken eggshell. Two experimental factorial design were performed, both with the addition of three central points. In the first one, 22, it was evaluated the ethoxylation number and the surfactant concentration. In the second one, 23, with 1% of Nonylphenol with 7 moles ethoxylated (NP7EO), it was evaluated the reaction time, catalyt concentration and methanol to oil molar ratio. Moreover, two different types of study were performed, one with NP7EO, and in the other NP7EO was not used, their kinetic constants were compared. The ethoxylation number and its concentration did not influence significantly in the biodiesel conversion. In the factorial design 23, the predicted model using 1% de NP7EO was significant, the maximum conversion was 98,95%, with 5% of CaO, methanol to oil molar ratio of 7/1, 65 ° C, 3 hours reaction. In the study with and without NP7EO, the kinetic constants, 0,012 min-1 and 0,0089 min-1, were obtained, respectively. Furthermore, the results have shown higher conversions in the reactions with NP7EO. Thus, the surfactant influenced better biodiesel conversions and improved the transesterification reaction rate, incrising its velocity. Probably due to its ability to improve the dispersion between the phases of the mixture reagents.

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