The steady-state and dynamic simulation of cascade distillation system for the production of oxygen-18 isotope from water

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• 作者：Yunhu Gao¹ ; ^{gyh6818@huayitec.net" class="auth_mail" title="E-mail the corresponding author} ; Zhihong Xu¹ ; Kejing Wu² ; Xiaolu Wang³ ; Zhaojun Yu¹ ; Weiyang Fei²
• 关键词：Oxygen-18 ; Deuterium ; Steady-state simulation ; Dynamic simulation ; Isotope separation
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：24
• 期：8
• 页码：979-988
• 全文大小：972 K

文摘

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 α_H/D for protium/deuterium and separation factor α_{¹⁶O/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.