Fig. 1From: Techno-economic analysis of extraction-based separation systems for acetone, butanol, and ethanol recovery and purificationAlternative three distillation columns (3DC) studied in this work. 3DC-1 (a) was used in dual extraction, high-temperature extraction, and direct steam distillation. 3DC-2 (b) was used in conventional and mixture extraction. D1, decanter. A, B, and E, acetone, butanol, and ethanol, respectively. P pressure, RC reboiler–condenserBack to article page