The challenging separation of ethyl acetate (EtAC) and methanol (MeOH) from wastewater involves two azeotropes and a distillation boundary. Although extractive distillation (ED) has been explored, the heterogeneous region within the ternary azeotropic mixture has been overlooked, which suggests the possibility of using a decanter to cross the distillation boundary when the feed composition is present in the heterogeneous region. This study introduces a novel heterogeneous triple-column distillation (NHTCD) that eliminates the external solvent injection, simplifying the complex ED processes. The NHTCD process is developed a systematic approach, comprising conceptual design based on thermodynamic insights and process optimization to determine the optimum configuration. Furthermore, heat integration (HI) and heat pump-vapor recompression (HP-VR) techniques were explored for energy conservation. Evaluation of energy, economic, and environmental (3E) aspects shows that the hybrid HP-VR with HI NHTCD process outperforms ED, achieving 87%, 57%, and 86% reductions in energy, economic, and environmental emissions.

中文翻译：

---

从废水中回收乙酸乙酯和甲醇的节能型非均相三塔共沸精馏工艺

从废水中分离乙酸乙酯 (EtAC) 和甲醇 (MeOH) 具有挑战性，涉及两种共沸物和一个蒸馏边界。尽管已经探索了萃取蒸馏（ED），但三元共沸混合物内的非均相区域被忽视，这表明当进料组合物存在于非均相区域中时，可以使用倾析器穿过蒸馏边界。本研究引入了一种新型多相三柱蒸馏 (NHTCD)，它消除了外部溶剂注入，简化了复杂的 ED 过程。NHTCD 工艺是一种系统方法，包括基于热力学见解的概念设计和工艺优化以确定最佳配置。此外，还探索了热集成（HI）和热泵蒸汽再压缩（HP-VR）技术来节省能源。能源、经济和环境（3E）方面的评估表明，混合HP-VR与HI NHTCD工艺的性能优于ED，实现能源、经济和环境排放分别减少87%、57%和86%。