Abstract
Isopropanol and acetonitrile are important chemical raw materials that are widely used in the chemical industry. However, mixtures of acetonitrile, isopropanol, and water are difficult to separate as these compounds form azeotropes. The solvents were screened based on their relative volatility and toxicity. To reduce the energy consumption, a heat pump-assisted extractive distillation process was proposed. Furthermore, the pervaporation–distillation hybrid process was studied. Life cycle assessment was used to evaluate the environmental impact of the processes. The total annual cost and energy consumption of the hybrid process were 21.11% and 45.91% lower, respectively, than those of the basic process. The values of global warming potential and acid potential of the hybrid process are 810.57 and 1.45, respectively, which are the smallest among those of processes studied. It is concluded that the hybrid process can not only reduce energy consumption, but is also more environmentally friendly than the other processes.
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