Simulation and Control of an Aromatic Extractive Distillation Column<br/>

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Simulation and Control of an Aromatic Extractive Distillation Column

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42038 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Shahrokhi, Mohammad
Abstract:
In this study steady state and dynamic simulation of an NFM extractive distillation unit for seperation of aromatics and non-aromatic components has been carried out. Column output composition obtained with experimental binary coefficients is compared with those obtainded by UNIFAC equation. The results indicate that using UNIFAC for all binrary coefficients results in an unacceptable error in concentration of benzene. If the experimental binary coefficents of benzene with NFM are used and the rest are calculated by UNIFAC equation, the simulation results will be very close to those obtained via experimental binary coefficients. Also it is shown that considering a constant efficiency for all trays is not a valid assumption and therfore efficiency and HETP calculations should be carried out using Rate-Based models. In dynamic simulation, the control loops have been considered and tuned by IMC (Internal Model Control) method. Also a feed forward controller has been designed for rejection of feed flow rate variations. The simulation has been carried out by ASPEN PLUS and ASPEN DYNAMICS version 2006
Keywords:
Dynamic Simulation ; Extractive Distillation Method ; N-Formylmorpholine (NFM)Solvent ; Internal Model Control (IMC)Tuning Method

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