dc.contributor | Badino Júnior, Alberto Colli | |
dc.contributor | http://lattes.cnpq.br/6244428434217018 | |
dc.contributor | Cruz, Antonio José Gonçalves | |
dc.contributor | http://lattes.cnpq.br/1812806190521028 | |
dc.contributor | http://lattes.cnpq.br/9618572624201461 | |
dc.creator | Sonego, Jorge Luiz Silveira | |
dc.date.accessioned | 2018-07-11T14:37:43Z | |
dc.date.available | 2018-07-11T14:37:43Z | |
dc.date.created | 2018-07-11T14:37:43Z | |
dc.date.issued | 2016-04-18 | |
dc.identifier | SONEGO, Jorge Luiz Silveira. Estudo da produção de etanol de sacarose por fermentação extrativa utilizando arraste com dióxido de carbono. 2016. Tese (Doutorado em Engenharia Química) – Universidade Federal de São Carlos, São Carlos, 2016. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10273. | |
dc.identifier | https://repositorio.ufscar.br/handle/ufscar/10273 | |
dc.description.abstract | The ethanol accumulated in the broth during fermentation is the main component toxic to
yeast, causing slower yeast growth and decreased ethanol production. One way of overcoming
this inhibition effect is to use extractive fermentation, where the ethanol is removed from the
broth during the fermentation process. The present work evaluated sucrose ethanol production
using extractive fermentation using CO2 as stripping gas. Firstly, it was made investigation of
the influence of specific CO2 flow rate, initial ethanol concentration and solution temperature
on ethanol stripping by CO2. At this stage the modeling of the of ethanol and water removal
was achieved by CO2 stripping according to a first order model. In sequence, it was studied
the production of ethanol by extractive fermentation in batch and fed-batch modes, employing
in a 5 L bubble column bioreactor and temperature of 34.0 °C. The kinetic parameters of the
hybrid Andrews-Levenspiel model were estimated by modeling of conventional batch and
fed-batch fermentations (without stripping) with CS0 of 180 g.L-1. Mathematical modeling of
extractive in batch and fed-batch ethanol fermentation was developed considering the removal
of ethanol and water, due to the CO2 stripping, according to a first order model. Later it was
optimized the production of ethanol by extractive fed-batch fermentation. A genetic algorithm
was used to simultaneous optimization the substrate feed rate (F) and the ethanol
concentration (CE0) to start CO2 stripping in extractive fed-batch fermentation, so as to obtain
the maximum ethanol productivity. The ethanol removal by stripping with carbon dioxide can
be modeled as a first order model. The hybrid model of Andrews-Levenspiel was adequate to
describe the kinetics of batch and fed batch ethanol fermentation. The proposed model for
extractive ethanol fermentation with CO2 was adequate to describe the behavior of extractive
fermentation in batch and fed batch modes. In the extractive ethanol fermentation with CO2
stripping an increase in substrate uptake rate (rS=−dCs/dt) after the beginning of ethanol
stripping and the total consumption of the substrate occurred before the extractive
fermentation compared to the conventional process. The extractive batch fermentation with
CS0=180 g.L-1 and CO2 stripping initiated after 3 h of fermentation at an ethanol concentration
of 43.3 g.L-1, resulted in an ethanol productivity (in g.L-1.h-1) about 25% higher than
conventional batch fermentation. For fed-batch fermentation, vat filling time (Ft) of 5 h and
start of ethanol stripping at 3 h of fermentation substantially reduced the inhibitory effects of
the substrate and ethanol on the yeast cells. This condition enabled the extractive fed-batch
ethanol fermentation to be performed using substrate concentrations of up to 240 g.L−1 in the
feed. The total ethanol concentration reached 110.3 g.L−1 (14 °GL) (wine + entrained). The
use of the optimization tool enabled using substrate concentrations of up to 300 g.L-1
generating a total concentration of ethanol of 17.2 °GL (wine + entrained), which means an
increase of 65% compared to the concentration final ethanol obtained in conventional
fermentation without stripping. | |
dc.language | por | |
dc.publisher | Universidade Federal de São Carlos | |
dc.publisher | UFSCar | |
dc.publisher | Programa de Pós-Graduação em Engenharia Química - PPGEQ | |
dc.publisher | Câmpus São Carlos | |
dc.rights | Acesso aberto | |
dc.subject | Arraste de etanol por CO2 | |
dc.subject | Fermentação extrativa | |
dc.subject | Fermentação alcoólica em batelada e batelada alimentada | |
dc.subject | Otimização da fermentação extrativa | |
dc.subject | Ethanol stripping by CO2 | |
dc.subject | Extractive fermentation | |
dc.subject | Ethanol fermentation in batch and fed-batch | |
dc.subject | Optimization of extractive ethanol fermentation | |
dc.title | Estudo da produção de etanol de sacarose por fermentação extrativa utilizando arraste com dióxido de carbono | |
dc.type | Tesis | |