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Approximate estimation of operational variables in fully thermally coupled distillation columns using pseudo-pinch points |
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| Authors: | Moon Yong Lee Dae Woong Choi Young Han Kim |
| Affiliation: | (1) School of Chemical Engineering and Technology, Yeungnam University, 214-1 Dae-dong, Gyeongsan, 712-749, Korea;(2) Department of Chemical Engineering, Dongeui University, San 24 Kaya-dong, Pusanjin-gu, Busan, 617-714, Korea;(3) Department of Chemical Engineering, Dong-A Universit, 840 Hadan-dong, Saha-gu, Busan, 604-714, Korea |
| Abstract: | An approximate procedure for the estimation of operational variables in fully thermally coupled distillation columns (FTCDCs) using two pseudo-pinch points of the feed and side draw trays is proposed, and its performance is examined with two example processes. The estimates from the proposed procedure show some 20% error compared with the results of rigorous simulation using commercial design software, the HYSYS. In addition, the relation between vapor flow rate and composition at one stage above the feed tray-required in the estimation of operational variables of the FTCDC-is analyzed to give information for the selection of the feed tray composition. A preliminary evaluation of operational variables helps to screen unrealizable design obtained often from iterative trial procedures employing the mathematical programming. |
| Keywords: | Distillation Column Design Thermally Coupled Distillation Pseudo-pinch Point Operational Variable Estimation Multi-component Distillation |
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