When extracting total glycosides from Panax notoginseng, a waste liquid containing chloroform and n-hexane will be produced. These waste liquids are not separated and recycled in time, which will not only waste resources but also cause environmental pollution. Chloroform and n-hexane form an azeotrope which cannot be separated by ordinary distillation methods. This study proposes three extractive distillation processes to separate the chloroform/n-hexane azeotrope: conventional extractive distillation (ED), side-stream extractive distillation (SSED) and extractive dividing wall column (EDWC). The total annual cost (TAC) and carbon dioxide (CO₂) emissions of the three options were compared, and the optimal process was selected. Furthermore, this research developed dynamic control of the optimal process.

中文翻译：

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氯仿/正己烷分离不同萃取精馏工艺的比较：设计与控制

从三七中提取总苷时，会产生含有氯仿和正己烷的废液。这些废液不及时分离回收，不仅会浪费资源，还会造成环境污染。氯仿和正己烷形成共沸物，不能用普通蒸馏方法分离。本研究提出了三种萃取蒸馏工艺来分离氯仿/正己烷共沸物：常规萃取蒸馏（ED）、侧流萃取蒸馏（SSED）和萃取间壁塔（EDWC）。年总成本 (TAC) 和二氧化碳 (CO ₂) 比较了三种方案的排放量，选择了最优工艺。此外，本研究开发了优化过程的动态控制。