The steady-state and dynamic simulation of cascade distillation system for the production of oxygen-18 isotope from water |
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Authors: | Yunhu Gao Zhihong Xu Kejing Wu Xiaolu Wang Zhaojun Yu Weiyang Fei |
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Affiliation: | 1.Jiangsu Huayi Technology Co., Ltd., Jiangsu 215522, China;2.State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;3.China Construction Installation Engineering Co. Ltd, Jiangsu 210049, China |
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Abstract: | Accurate simulation of water distillation system for oxygen-18 (18O) isotope separation is necessary to guide industrial practice, since both deuterium (D) and oxygen-18 isotope get enriched and interfere with each other. In the present work, steady-state and dynamic distillation models are established based on a classic method and a cascade distillation system with 5 towers is introduced to test the models. The theoretical expressions of separation factor αH/D for protium/deuterium and separation factor α16O/18O.for oxygen-16/oxygen-18 were derived, with the existence of deuterium and oxygen-18, respectively. The results of the steady-state simulation by the classical method proposed in the present work agreed well with the results of the lumping method. The dynamic process could be divided into 5 stages. Impressively, a peak value of product withdraw was observed before the final steady state, which was resulted from the change of 16O/18O separation factor and isotope distribution. An interesting low concentration zone in the towers of T2-T5 existed at the beginning of the dynamic process and it required industrial evidence. |
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Keywords: | Oxygen-18 Deuterium Steady-state simulation Dynamic simulation Isotope separation |
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