A dynamic control structure of liquid-only transfer stream distillation column

Borui Liu; Tao Zhang; Yi Zheng; Kailong Li; Hui Pan; Hao Ling

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A dynamic control structure of liquid-only transfer stream distillation column

Full Length Article | Updated：2026-01-06

- A dynamic control structure of liquid-only transfer stream distillation column
- Chinese Journal of Chemical Engineering Vol. 59, Issue 7, Pages: 135-145(2023)
- Affiliations：
  
  1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology,Shanghai,China,200237
  2. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering, Shanghai University of Electric Power,Shanghai,China,200090
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2023
- Accepted：
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Borui Liu, Tao Zhang, Yi Zheng, Kailong Li, Hui Pan, Hao Ling. A dynamic control structure of liquid-only transfer stream distillation column[J]. Chinese Journal of Chemical Engineering, 2023, 59(7): 135-145.
DOI：

Borui Liu, Tao Zhang, Yi Zheng, Kailong Li, Hui Pan, Hao Ling. A dynamic control structure of liquid-only transfer stream distillation column[J]. Chinese Journal of Chemical Engineering, 2023, 59(7): 135-145. DOI：

摘要

Abstract

The intention of this fundamental work is to explore the manipulation of a mixture of benzene

toluene and

-xylene separated from liquid-only transfer divided-wall column (LTS-DWC). First

two control structures are clearly proposed

including seven component control loops (CS1) and seven temperature control loops (CS2). However

two control structures can handle ±10% feed disturbances rather than larger feed disturbances. Subsequently

an equivalent four-column model by introducing withdraw ratio is developed to discuss the effect of two liquid-only side-stream on the overall reboiler duty. It is indicated that the second liquid-only side-stream withdraw ratio strongly affects the overall energy consumption. Hence

six-component control loops within the fixed second liquid-only side-stream withdraw ratio (CS3) is proposed and the purity of products returns to set value even as facing ±20% feed disturbances. Finally

based on the above results

it is established a temperature control structure (CS4) for controlling fixed second liquid-only side-stream withdraw ratio

which can cope with ±15% disturbances. Inspired by these findings

an insight into the dynamic control of LTS-DWC promotes the industrial implementation of DWC through

new liquid-only side-stream configurations.

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