| Texto completo | |
| Autor(es): |
Pereira, Rauber D.
;
Almeida, Leticia P.
;
Sousa, Marina D. B.
;
Buffo, Mariane M.
;
Veloso, Ivan I. K.
;
Silva, Kaio C. R.
;
Cruz, Antonio J. G.
;
Badino, Alberto C.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CHEMICAL ENGINEERING AND PROCESSING; v. 205, p. 17-pg., 2024-10-03. |
| Resumo | |
The efficiency of stripping processes for volatile compounds is governed by mechanical and thermodynamic entrainments, which play crucial roles in ethanol removal during the extractive fermentation process. These mechanisms depend on variables such as bubble diameter, ethanol concentration, liquid volume, pressure, and temperature. However, the quantification of each of them separately and their dependence on bubble diameter have never been addressed. The present study proposes a new methodology to evaluate both mechanical and thermodynamic entrainments, based on experimental data and thermodynamic equilibrium analysis of the bubbles in reactors with working volumes of 10.0 and 50 L, aiming to clarify the role that bubble diameter (microbubbles, fine and coarse bubbles) plays in these mechanisms. The results indicated that thermodynamic equilibrium was reached for any size of bubbles up to 5 mm in diameter, under a wide range of experimental conditions with specific gas flow rates from 0.22 to 10 vvm. Equally important, mechanical entrainment was found to enrich the gas phase in ethanol by a factor of 15, representing a higher concentration factor than for thermodynamic entrainment, which was inconceivable initially. This introduces a new and promising approach to intensify the stripping process of volatile compounds by means of mechanical entrainment. (AU) | |
| Processo FAPESP: | 21/06659-0 - Caracterização de um novo gerador de bolhas finas para aplicação em bioprocessos |
| Beneficiário: | Rauber Daniel Pereira |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 18/24460-4 - Geração de microbolhas em biorreatores pneumáticos: aplicação na fermentação alcoólica extrativa utilizando dióxido de carbono como gás de arraste |
| Beneficiário: | Rauber Daniel Pereira |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |