| Full text | |
| Author(s): |
Cerri, Marcel Otavio
;
Policarpo, Lucas Makrakis
;
Badino, Alberto Colli
Total Authors: 3
|
| Document type: | Journal article |
| Source: | INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING; v. 8, p. 24-pg., 2010-01-01. |
| Abstract | |
Global gas hold-up and volumetric oxygen transfer coefficient (k(L)a) were evaluated in three internal-loop airlift reactors (ALR) with different working volumes (2, 5, and 10 dm(3)) and similar geometric configuration utilizing eight Newtonian fluids. Superficial gas velocity in the riser (UGR) was ranged from 0 to 0.112 ms(-1). The effects of the superficial gas velocity (UGR) and liquid viscosity had contrary effects on k(L)a. However, they presented the same order of magnitude showing that the viscosity effect on the oxygen mass transfer cannot be neglected. Two correlations based on dimensional analysis relating global gas hold-up and k(L)a to the geometric parameters, physical properties of the fluids, and operational conditions were proposed. Very good fittings between calculated and experimental data of and k(L)a were obtained. The influence of the internal diameter of the reactor on k(L)a was considered positive showing that in large-scale reactors an appropriate oxygen transfer can be reached under smaller aeration conditions, due to higher internal diameter. (AU) | |
| FAPESP's process: | 08/10432-7 - Evaluation of the hydrodynamics and mass transfer of pneumatic reaction system and its utilization on production of beta-lactam compounds |
| Grantee: | Marcel Otavio Cerri |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 05/55079-4 - Production and purification of clavulanic acid, cephamycin C and other bioactive metabolites of Streptomyces |
| Grantee: | Carlos Osamu Hokka |
| Support Opportunities: | Research Projects - Thematic Grants |