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 -~.
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