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Toward a Flexible Design for the Bioethanol Dehydration Using Extractive Distillation. Part 2: Validation of Operability under Uncertainty Using Base-Layer Control

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posted on 2023-12-13, 02:43 authored by Tiffany Ang, Cheng-Yu Tsai, Vincentius Surya Kurnia Adi, Yuhe Tian, Zong Yang Kong, Jaka Sunarso
Here, we validated the flexibility of the bioethanol dehydration process from our previous work (Tsai, C.-Y.; Ang, T.; Kong, Z. Y.; Sunarso, J.; Adi, V. S. K. Ind. Eng. Chem. Res. 2023, DOI: 10.1021/acs.iecr.3c01854.) via dynamic simulation. Previously, we integrated flexibility index (FI) into the initial design of extractive distillation (ED) to address variability and uncertainties in the early design stage, fostering robustness. However, a notable concern arose when incorporating FI into a steady-state environment, raising questions about the system's closed-loop dynamic behavior and resilience to disturbances. To tackle this, we transformed steady-state models into dynamic models using Aspen Plus Dynamics. Our validation revealed that the cost-minimization model aligns well with steady-state simulations, while the FI maximization and the integrated function (TACFI) models behave differently. Nonetheless, optimizing the model based on the FI indeed enhances flexibility, consistent with our prior work. Overall, integrating operational flexibility into steady-state design improves the operational flexibility of bioethanol dehydration via the ED process.

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