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Biobutanol is a potential biofuel produced from various biomass and can serve as a suitable alternative to the nonrenewable fossil-based gasoline fuel. The fermentative microbes used for biobutanol production are solvent-producing  Clostridium  organisms by Acetone-Butanol-Ethanol (ABE) fermentation. The major challenges of ABE fermentation are butanol toxicity to the host strain, lack of effective fermentation strategies, inefficient butanol separation, and low 0.5–2% w/w yield. Butanol forms an azeotropic mixture with water and requires 79.5 MJ/kg energy for separation using conventional distillation when the energy content of butanol is only 36 MJ/kg; hence the separation by traditional distillation processes is inefficient. Recent developments in membrane technology, coupled with novel extractants and adsorbents, are promising for efficient, energy-effective, and economical bio-butanol separation. Among the techniques, liquid-liquid extraction has shown a high separation efficiency of 75–85% butanol with an energy demand of 25 MJ/kg, whereas adsorption and pervaporation have shown an energy demand of 35–40 MJ/kg. In the present review, a critical analysis of the recent trends, strategies, technical prospects, challenges, and economical evaluation of different methods of biobutanol recovery is presented.

Critical Analysis of Various Strategies for the Effective and Economical Separation and Purification of Butanol from ABE Fermentation