Technical and Economical Comparison of Distillation / Dehydration Concepts for Bioalcohol - Water Mixtures

H. Brüschke, M. Heckmann, M. Weyd & S. Jakob
In the state­of­art production of bioalcohol the distillation/dehydration step is the most energy intensive unit operation and in the respect to the cost breakdown of the overall costs the second highest after the raw materials. Therefore any attempts to reduce the production costs of ‘bioethanol’ and biobutanol have to consider the distillation/dehydration step. The state­of­art process of today is distillation of the fermentation broth to a concentration close to the azeotrope in one or several...