masterThesis
Interesterificação supercrítica do óleo de gergelim (Sesamum indicum L.) com acetato de metila e ácido acético
Fecha
2019-05-28Registro en:
SILVA, Paulo César Messias da. Interesterificação supercrítica do óleo de gergelim (Sesamum indicum L.) com acetato de metila e ácido acético. 2019. 73f. Dissertação (Mestrado em Engenharia Química) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2019.
Autor
Silva, Paulo César Messias da
Resumen
Biodiesel has established itself as a promising source of renewable energy and substitute for oil
diesel due to its high energy power, because it is biodegradable and for making a "clean burn".
The interesterification with methyl acetate is a technique that has the advantage of producing,
in addition to the methyl esters (biodiesel), the Triacetin (product of great market value). The
supercritical technology enables the production of biodiesel without the presence of catalysts,
eliminating the need for further purification processes. Sesame (Sesamum indicum L.) is one of
the oldest oleaginous known to mankind. Due to the high oil content in its seeds, the sesame
has become a possibility for the production of biodiesel. Thus, this work investigated the
production of biodiesel through the interesterification reaction of sesame oil with methyl acetate
under supercritical conditions. A continuous tubular reactor was used under conditions of
temperature and pressure of 325-375 °C and 15-20 MPa, respectively, in residence time
between 15-55 min, with a molar ratio oil/acetate of 1:40. Pareto analysis showed that
temperature was most significant parameter for the yield. A maximum yield in methyl esters of
31.91% was been achieved at 375 °C, 20 MPa in 15 min. Moreover, it was possible to perceive
that the addition of 20% (in relation to the oil mass) of a solution of acetic acid at a concentration
of 26% in mass, provided an increase in yield under mild temperature condition: 49.81% at 325
°C and 15 MPa in 55 min. With Pareto analysis, in this case, it was concluded that residence
time was a significant parameter, however, the combined effect between temperature and
residence time was the most relevant for the esters yield.