Bioethanol of first generation is the world’s leader biofuel and it is produced by fermentation mainly from starch and sugar feedstocks. The use of continuous fermentation processes implies the possibility of making the process automatic while lowering the operating costs. Continuous fermentation can be achieved by using stirred-tank reactors in series (6-8 reactors) or by using, continuous plug-flow reactor in which the yeast is immobilized on a support. There are many types of supports that have already been tested. This paper will focus on the uses of the polyacrylamide supports with different compositions obtained in low temperature conditions (-18°C). The activity of the immobilized yeast was tested in comparison to the free yeast in suspension by fermentation of some molasses solutions in a batch reactor. The influences of the type of support and of fermentation conditions over the parameters for obtaining ethanol (fermentation rates and the yield process) are underlined in this article.
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