Fed-batch alcoholic fermentation of sugar cane blackstrap molasses: influence of the feeding rate on yeast yield and productivity

✍ Scribed by João Carlos M. Carvalho; Eugênio Aquarone; Sunao Sato; Milton L. Brazzach; Dante A. Moraes; Walter Borzani

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 324 KB
• Volume: 38
• Category: Article
• ISSN: 1432-0614
• DOI: 10.1007/bf00182795

✦ Synopsis

F e d -b a t c h ethanol f e r m e n t a t i o n tests of sugar cane blackstrap molasses were carried out at 32°C and p H 4.5-5.0, using pressed yeast as inoculum, and with no air supply. Two values of the fermentor filling-up time were adopted: 5 h and 7 h. The feeding rates obeyed equation F = F o ' e -K t , with K equal to 0.0, 0.2, 0.4, 0.6 and 0.8 h -1. The average yeast yields and the average yeast productivities increased up to 33°70 and 45%, respectively, while the ethanol yield (aver-age=76°70; standard d e v i a t i o n = 4 % ) was practically unaffected when K increased from 0 to 0.8 h -~.