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Optimization of EB/SM Distillation Processes Based on Divided Wall Columns in a PO/SM Process with a Chaos

Zhongqi Liu1, Xinyu Zhao1, Junkai Zhang1

  • 1Center for Process Simulation & Optimization, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.

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|February 21, 2022
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Summary

Divided wall columns (DWC) optimize styrene separation, reducing energy costs. Fully thermally coupled DWC saves 21.36% total annual cost, offering superior economic efficiency for chemical processes.

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Area of Science:

  • Chemical Engineering
  • Process Optimization
  • Separation Technology

Background:

  • Styrene is a crucial chemical raw material with a high market value, largely due to energy-intensive separation processes.
  • The propylene oxide/styrene monomer (PO/SM) process involves a significant styrene separation unit, presenting an opportunity for optimization.

Purpose of the Study:

  • To optimize the styrene separation unit within a PO/SM process using divided wall columns (DWC).
  • To evaluate DWC models based on economic viability (minimum total annual cost - TAC) and operational flexibility (degrees of freedom).
  • To enhance the efficiency of optimization algorithms for finding the minimum TAC.

Main Methods:

  • Development and evaluation of four distinct divided wall column (DWC) models for styrene separation.
  • Application of differential evolutionary (DE) algorithms, enhanced with chaotic sequences, for optimizing DWC parameters and minimizing TAC.
  • Comparative analysis of DWC models against conventional separation processes.

Main Results:

  • Wright's fully thermally coupled DWC (FTC) demonstrated the highest economic efficiency, achieving a 21.36% reduction in TAC compared to conventional methods.
  • Agrawal's liquid-only transfer DWC (ALT) offered a 10.14% TAC saving and provided two additional degrees of freedom for operability compared to FTC.
  • The enhanced DE algorithm with chaotic sequences improved optimization efficiency, overcoming the issue of local solutions in traditional DE.

Conclusions:

  • Divided wall columns significantly improve the economics and efficiency of styrene separation in the PO/SM process.
  • The FTC model is the most economically advantageous, while the ALT model presents a favorable balance between cost savings and operational flexibility.
  • Chaotic sequences enhance the performance of DE algorithms for complex process optimization tasks.