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Optimal design of extractive distillation for acetic acid dehydration with N-methyl acetamide

You, Xinqiang and Gu, Jinglian and Peng, Changjun and Rodríguez-Donis, Ivonne and Liu, Honglai Optimal design of extractive distillation for acetic acid dehydration with N-methyl acetamide. (2017) Chemical Engineering and Processing: Process Intensification, 120. 301-316. ISSN 0255-2701

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Official URL: https://doi.org/10.1016/j.cep.2017.07.025


A distinctive strategy for entrainer recycling is proposed in this work for acetic acid (AA) dehydration by extractive distillation by using N methyl acetamide (NMA). The use of standard entrainers such as DMF or DMSO has the main drawback of forming an azeotrope with acetic acid. However, the vapour liquid equilibrium AA – NMA exhibits a tangential pinch point at NMA end composition. The new strategy rises from the thermodynamic analysis of the ternary diagram that which involves no azeotrope. As a result, acetic acid with high purity can be obtained by the recycling of the entrainer with a relaxed constraint in its purity. Optimization studies are discussed by using two approaches: two-step optimization method with Sequential Quadratic Programming (TSOM case) and the multi-objective genetic algorithm. The multi-objective genetic algorithm allowed the computation of the optimal acetic acid dehydration with an impurity of 3% in the recycled entrainer. Significant cost savings are achieved thanks to the optimization of both columns together. Energy consumption is reduced by 12.8% and 56.9% whereas TAC is saved by 28.4% and 56.3% compared with optimal case TSOM (impurity content 1%) and a published “Case Ref” (impurity content 0.01%), respectively.

Item Type:Article
HAL Id:hal-01604508
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Chongqing University (CHINA)
Other partners > East China University of Science and Technology - ECUST (CHINA)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Laboratory name:
Deposited On:29 Nov 2019 12:40

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