| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308953 |
| ISSN: | 0104-6632 |
| Autors: | Vasconcelos, J.N. de1 Lopes, C.E2 Franca, F.P. de3 |
| Institucions: | 1Universidade Federal de Alagoas, Departamento de Engenharia Quimica, Maceio, Alagoas. Brasil 2Universidade Federal de Pernambuco, Departamento de Antibioticos, Recife, Pernambuco. Brasil 3Universidade Federal do Rio de Janeiro, Escola de Quimica, Rio de Janeiro. Brasil |
| Any: | 2004 |
| Període: | Sep |
| Volum: | 21 |
| Número: | 3 |
| Paginació: | 357-365 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | Sugar-cane stalks, 2.0 cm long, were used as a support for yeast immobilization envisaging ethanol production. The assays were conducted in 38.5 L fermenters containing a bed of stalks with 50% porosity. The operational stability of the immobilized yeast, the efficiency and stability of the process, as well as the best dilution rate were evaluated. Molasses from demerara sugar production was used in the medium formulation. It was diluted to obtain 111.75 ± 1.51 g/L without any further treatment. Sulfuric acid was used to adjust the pH value to around 4.2. Every two days Kamoran HJ (10 ppm) or with a mixture containing penicillin (10 ppm) and tetracycline (10 ppm), was added to the medium. Ethanol yield and efficiency were 29.64 g/L.h and 86.40%, respectively, and the total reducing sugars (TRS) conversion was 74.61% at a dilution rate of 0.83 h-1. The yeast-stalk system was shown to be stable for over a 60 day period at extremely variable dilution rates ranging from 0.05 h-1 to 3.00 h-1. The concentration of immobilized cell reached around 109 cells/gram of dry sugar-cane stalk when the fermenter was operating at the highest dilution rate (3.00 h-1) |
| Disciplines | Química |
| Paraules clau: | Fermentaciones, Biotecnología, Fermentación continua, Fermentación alcohólica, Levaduras, Caña de azúcar, Tallos, Células inmovilizadas, Etanol |
| Keyword: | Chemistry, Fermentation, Biotechnology, Continuous fermentation, Alcoholic fermentation, Yeasts, Sugar cane, Stalks, Immobilized cells, Ethanol |
| Text complet: | Texto completo (Ver HTML) |
