Biobutanol is considered to be a promising alternative biofuel in terms of sustainability and environmental friendliness because of its desirable properties. High purity isopropanol–butanol–ethanol (IBE) mixture can be directly used as gasoline additive. However, the purification process of IBE is hindered because of its low concentration and high energy consumption. In order to reduce energy consumption and improve the efficiency of the IBE purification process, two novel processes combining liquid–liquid extraction with extractive distillation or azeotropic distillation are proposed. Moreover, the heat integration designs of the processes are carried out to further reduce energy. These processes are compared with regard to energy, economic, environmental and exergy impact.

中文翻译：

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用于汽油添加剂的异丙醇-丁醇-乙醇提纯的新型节能萃取辅助蒸馏设计

就其可持续性和环境友好性而言，由于其理想的特性，生物丁醇被认为是一种有前途的替代生物燃料。高纯度异丙醇-丁醇-乙醇（IBE）混合物可直接用作汽油添加剂。然而，由于IBE的低浓度和高能耗，其纯化过程受到阻碍。为了减少能量消耗并提高IBE纯化过程的效率，提出了将液-液萃取与萃取蒸馏或共沸蒸馏相结合的两个新工艺。此外，进行工艺的热集成设计以进一步减少能量。比较了这些过程在能源，经济，环境和火用方面的影响。