| Full text | |
| Author(s): |
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.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | CHEMICAL ENGINEERING AND PROCESSING; v. 205, p. 17-pg., 2024-10-03. |
| Abstract | |
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) | |
| FAPESP's process: | 21/06659-0 - Characterization of a new fine bubbles generator for bioprocess application |
| Grantee: | Rauber Daniel Pereira |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 18/24460-4 - Microbubbles generation in pneumatic bioreactors: application in extractive ethanol fermentation using carbon dioxide as stripping gas |
| Grantee: | Rauber Daniel Pereira |
| Support Opportunities: | Scholarships in Brazil - Doctorate |