Many design variables and constraints, such as operating temperature and pressure of existing batch distillation or operating temperature of existing cooling and heating media, must be verified and satisfied during design and optimization when an existing batch distillation column is utilized for new mixture. The convergence of batch distillation simulation is sensitive with the initial values of these variables. Thus, a new systematic methodology was proposed to design and optimize separation of a new mixture using an existing batch column. The systematic methodology was based on an industrial case study of dichlorodifluoromethane (R-12) reclamation from a waste refrigerant mixture. Based on a comparison of the Pxy diagram with experimental data, “REFerence fluid PROPerties” was selected as the thermodynamic model. After design and optimization using shortcut and rigorous methodologies, the existing batch distillation unit was operated to validate the proposed methodology. The experimented performance match well with the simulated results. Under the optimized operating condition, complete purification of R-12 (purity=99.5%) was achieved experimentally after 28.3 h. The advantages and disadvantages of the proposed methodology were then discussed.

中文翻译：

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使用现有的工业规模间歇蒸馏净化用于制冷剂回收的 R-12：设计、优化、模拟和实验研究

当现有间歇蒸馏塔用于新混合物时，在设计和优化过程中必须验证和满足许多设计变量和约束，例如现有间歇蒸馏的操作温度和压力或现有冷却和加热介质的操作温度。批量蒸馏模拟的收敛性对这些变量的初始值很敏感。因此，提出了一种新的系统方法来设计和优化使用现有批次色谱柱分离新混合物的方法。该系统方法基于从废制冷剂混合物中回收二氯二氟甲烷 (R-12) 的工业案例研究。根据 Pxy 图与实验数据的比较，选择“REFerence fluid PROPerties”作为热力学模型。在使用快捷和严格的方法进行设计和优化后，运行现有的间歇蒸馏装置以验证所提出的方法。实验性能与模拟结果匹配良好。在优化的操作条件下，28.3 h后实验实现了R-12的完全纯化（纯度=99.5%）。然后讨论了所提出的方法的优点和缺点。