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Optimal operation and tracking control of vapor-recompressed batch distillation
  • Madhuri Vibhute,
  • Sujit Jogwar
Madhuri Vibhute
Indian Institute of Technology Bombay
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Sujit Jogwar
Indian Institute of Technology Bombay
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Peer review status:UNDER REVIEW

25 Jun 2020Submitted to AIChE Journal
26 Jun 2020Assigned to Editor
26 Jun 2020Submission Checks Completed
01 Jul 2020Reviewer(s) Assigned

Abstract

Vapor recompressed batch distillation (VRBD) is an energy-integrated configuration which works on the principle of a heat pump. Operation of such a column is challenging due to unsteady, nonlinear dynamics and strong interplay between separation and energy efficiency. In this paper, a two-step approach is proposed for optimal operation and control of such a column. Initially, an openloop optimal operation policy is generated for maximization of an overall performance index using offline optimization. To this end, three performance indices are proposed to capture interplay between separation and energy efficiency. Subsequently, a model-based output feedback controller is designed to track this optimal performance trajectory. The effectiveness of the proposed approach is demonstrated using a benzene-toluene separation case study wherein it is shown that the proposed approach helps to achieve optimal operation in the presence of operational disturbances.