封面图片
2020年, 第14卷 第5期
(Zhaoyou Zhu, Guoxuan Li, Yao Dai, Peizhe Cui, Dongmei Xu, Yinglong Wang, pp. 824‒833)
The traditional approach of solvent selection in the extractive distillation process strictly focuses on the change in relative volatility of the light-heavy component caused by the solvent. However, the total annual cost of the process may not be minimal when the solvent causes the greatest change in relative volatility. This work presents a heuristic method to select the optimal solvent to minimize the total annual cost. The functional relationship between the relative volatility and the total annual cost is established, where the main factors, such as the relative volatility of the light-heavy component and relative volatility of the heavy-component solvent, are taken into account. Binary azeotropic mixtures of methanol-toluene and methanol-acetone are separated to verify the feasibility of the model. The result shows that the total annual cost of the process by using the solvent with the minimal two-column extractive distillation index is the lowest. This study provides a rapid and effective design strategy for the preliminary selection of solvents in extractive distillation.
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ISSN 2095-0179 (Print)
ISSN 2095-0187 (Online)
CN 11-5981/TQ
Postal Subscription Code 80-969 Formerly Known as Frontiers of Chemical Science and Engineering in China 2018 Impact Factor: 2.809