Fig. 7From: Novel distillation process for effective and stable separation of high-concentration acetone–butanol–ethanol mixture from fermentation–pervaporation integration processVDP representing a scenario 3 and b scenario 4. The flow rate in feed (stream 1) was 1025 kg/h. The red data are the columns with higher energy cost while the green data relatively requires less energy compared to the atmospheric distillations shown in Fig. 3. Feeding plates, overall plates as well as the overhead pressure of each column were also shown in this figureBack to article page