Experimental investigation of conventional control strategies for a heterogeneous azeotropic distillation column |
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| Authors: | I-L Chien C J Wang D S H Wong C -H Lee S -H Cheng R F Shih W T Liu C S Tsai |
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| Affiliation: | 1. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 106;2. Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300;3. Department of Chemical Engineering, Chang Gung University, Kweishan, Taoyuan, Taiwan 333;4. Pilot plant Division, Union Chemical Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 300;1. Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Saxony-Anhalt, Germany;2. Department of Physical Chemistry, Kazan Federal University, Kazan, Tatarstan, Russia;3. Department of Physical Chemistry and Department “Science and Technology of Life, Light and Matter,” University of Rostock, Rostock, Mecklenburg-Vorpommern, Germany;1. Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, USA;2. Department of Molecular, Cellular, and Developmental Biology, University of California-Santa Barbara, Santa Barbara, CA 93106, USA;1. School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China;2. The Co-Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, China;3. Shijiazhuang Pharmaceutical Group Ou Yi Co., Ltd, Shijiazhuang 050051, China;4. Shanghai Tofflon Science & Technology Co., Ltd, Shanghai 201109, China;5. University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | In this work, a laboratory scale sieve plate distillation column was constructed to investigate the conventional control strategies of an isopropyl alcohol (IPA), cyclohexane (CyH) and water (H2O) heterogeneous azeotropic distillation column. Steady state process analysis showed that the optimal operation point should be located at a critical reflux, a transition point at which the distillation path switches from a route that passes through IPA+H2O azeotrope to one that passes through IPA+CyH azeotrope. At this critical reflux, a high purity IPA product can be obtained with minimum energy consumption and maximum product recovery. However, the steady state is extremely sensitive to feed disturbances. A good control strategy must be able to maintain a steady column temperature profile that shows a plateau near 70°C to ensure passage around IPA+CyH azeotrope. In this study, an inverse double loop control strategy is recommended. Through experimental testing, the proposed control strategy was demonstrated to keep the product IPA purity at the desired high-purity level under all feed disturbance changes while other conventional control strategies fail. |
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| Keywords: | Heterogeneous azeotropic distillation Azeotropic column control Control experiments |
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