Computer Aided Chemical Engineering
This work addresses the production of gasohol using gasoline as a separation agent, an alternative approach to processes that recover and dehydrate ethanol before its blending with gasoline. Experimental data was used to build the thermodynamic model used to predict phase equilibrium and thermophysical properties. Two configurations for the direct manufacture of E10 gasohol were analyzed. Process I is extraction-based whereas Process II is extractive distillation-based. The processes were compared with each other in terms of energy needs as well as with a state-of-art process where ethanol dehydration is performed with molecular sieves (Process MS). The results show that Processes I and II are energetically favorable, and consume, after process optimization and heat integration, 30% less heat than Process MS, for ethanol concentrations in fermentation broths between 2 and 10 wt%. Furthermore, estimated ethanol separation costs are approximately $0.19/kg-ethanol for a 5 wt% feed. © 2019 Elsevier B.V.
Year of publication: 2019