Turndown Control Structures for Distillation Columns

2010 ◽  
Vol 49 (24) ◽  
pp. 12548-12559 ◽  
Author(s):  
Patrick J. Robinson ◽  
William L. Luyben
Keyword(s):  
Distillation Columns ◽  
Control Structures

Assessment of control structures for binary distillation columns with secondary reflux and vaporization

1985 ◽  
Vol 24 (3) ◽  
pp. 852-858 ◽  
Author(s):  
Kazuyuki Shimizu ◽  
B. R. Holt ◽  
Manfred Morari ◽  
Richard S. H. Mah
Keyword(s):  
Distillation Columns ◽  
Control Structures

scholarly journals Comparing Composition Control Structures for Kaibel Distillation Columns

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 218 ◽  
Author(s):  
Yang Yuan ◽  
Kejin Huang ◽  
Haisheng Chen ◽  
Xing Qian ◽  
Lijing Zang ◽  
...  
Keyword(s):  
Control Systems ◽  
Distillation Column ◽  
Tight Control ◽  
Distillation Columns ◽  
Control Structures ◽  
Control Loops ◽  
Composition Control ◽  
Equipment Investment ◽  
Quaternary Mixture ◽  
Operation Cost

Although Kaibel distillation columns are superior to conventional distillation sequences owing to smaller equipment investment and operation cost, they display high nonlinearity and this greatly increases the difficulty of achieving their tight control. To overcome this problem, four decentralized composition control structures, i.e., the CSR/QR, CSR/B, CSD/QR, and CSD/B structures, are proposed and compared based on the control of a Kaibel distillation column fractionating a methanol/ethanol/propanol/butanol quaternary mixture. These four composition control structures all include five composition control loops. While the four of them are employed to maintain the purity of the top, upper sidestream, lower sidestream, and bottom products, the remaining one is employed to minimize the energy consumption of the Kaibel distillation column by maintaining the composition of propanol at the first stage of the prefractionator. Dynamic simulation results show the CSR/QR and CSR/B structures can tightly maintain the purity of the controlled products with a small overshoot and short settling time after facing various disturbances in feed conditions, but the CSD/QR and CSD/B structures lead to oscillatory responses (the latter even shows divergent responses under individual disturbances). At the end of the article, some effective guides for developing composition control systems are given.

scholarly journals Design and Control of Glycerol-tert-Butyl Alcohol Etherification Process

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Elena Vlad ◽  
Costin Sorin Bildea ◽  
Grigore Bozga
Keyword(s):  
Flow Reactor ◽  
Plug Flow ◽  
Extractive Distillation ◽  
Butyl Alcohol ◽  
Balance Model ◽  
Distillation Columns ◽  
Control Structures ◽  
Amberlyst 15 ◽  
Plantwide Control ◽  
The Stability

Design, economics, and plantwide control of a glycerol-tert-butyl alcohol (TBA) etherification plant are presented. The reaction takes place in liquid phase, in a plug flow reactor, using Amberlyst 15 as a catalyst. The products' separation is achieved by two distillation columns where high-purity ethers are obtained and a section involving extractive distillation with 1,4-butanediol as solvent, which separates TBA from the TBA/water azeotrope. Details of design performed in AspenPlus and an economic evaluation of the process are given. Three plantwide control structures are examined using a mass balance model of the plant. The preferred control structure fixes the fresh glycerol flow rate and the ratio glycerol + monoether : TBA at reactor-inlet. The stability and robustness in the operation are checked by rigorous dynamic simulation in AspenDynamics.

scholarly journals Analysis of Multi-Loop Control Structures of Dividing-Wall Distillation Columns Using a Fundamental Model

Processes ◽  
2014 ◽  
Vol 2 (1) ◽  
pp. 180-199 ◽  
Author(s):  
Salvador Tututi-Avila ◽  
Arturo Jiménez-Gutiérrez ◽  
Juergen Hahn
Keyword(s):  
Loop Control ◽  
Distillation Columns ◽  
Control Structures ◽  
Fundamental Model
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