A semicontinuous approach for heterogeneous azeotropic distillation processes |
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Affiliation: | 1. Institute of Hydrogen Economy, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia;2. Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia;1. CAPEC-PROCESS Research Center, Department of Chemical and Bio-chemical Engineering, Technical University of Denmark, Søltofts Plads, Building 229, DK-2800 Kgs. Lyngby, Denmark;2. FVT-Department of Chemical and Biochemical Engineering, Technical University of Dortmund (TU Dortmund), Emil-Figge-Str. 70, D-44227 Dortmund, Germany;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China;2. China Huan Qiu Contracting & Engineering Corp., Beijing 100029, China;1. Institute of Future Energy, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia;2. Department of Chemical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia |
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Abstract: | The separation of azeotropes has substantial energy and investment costs, and the available methods require high capital costs for reconstruction of process plants. As an alternative, a semicontinuous configuration that utilizes an existing plant with minor modifications has been explored. In this paper, a semicontinuous, heterogeneous azeotropic distillation process is proposed and acetic acid dehydration process is used as a case study. To carry out the simulation work, Aspen HYSYS® simulation software is used along with MATLAB® and an interface program to handle the mode-transition of the semicontinuous process. Sensitivity analyses on operating parameters are performed to identify the process limits. Comparisons are made to conventional heterogeneous azeotropic distillation, and dividing-wall distillation column on the annual cost. The results proved that the semicontinuous system is the best setup in terms of total annual costs and energy requirements. |
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Keywords: | HAc dehydration Heterogeneous azeotropic distillation Dividing-wall distillation columns Process optimization Semicontinuous approach |
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