Several new extractive distillation configurations using green and highly selective ionic liquid (IL) as extractant are proposed as an alternative to the conventional extractive distillation (CED) and conventional extractive dividing wall column (CEDWC) configuration to separate methyl alcohol (MeOH)-methyl ethyl ketone (MEK)-tert butyl alcohol (TBA) azeotropic mixture, including direct and indirect extractive distillation (direct-ED, indirect-ED), azeotropic extractive distillation (AED), and extractive dividing wall column (EDWC). These schemes are optimized with the objective of total annual costs (TAC) by simulated annealing based optimization method. Among these schemes, EDWC is undoubtedly the best due to the benefits of IL and dividing wall column. As compared with the CED process, it can reduce TAC by 22.19%, total capital cost by 31.47%, total operating cost by 8.35%, CO₂ emission by 7.7%. In addition, the computation shows that the used optimization method is very practical for the optimal design of complex distillation systems with the advantages of direct, efficient, robust and global optimal.

提出了几种使用绿色和高选择性离子液体（IL）作为萃取剂的新萃取蒸馏配置，以替代常规萃取蒸馏（CED）和常规萃取分隔壁塔（CEDWC）配置来分离甲醇（MeOH）-甲基乙基酮（MEK）-叔丁醇（TBA）共沸混合物，包括直接和间接萃取蒸馏（direct-ED，indirect-ED），共沸萃取蒸馏（AED）和萃取分隔壁塔（EDWC）。通过基于模拟退火的优化方法，以年度总成本（TAC）为目标对这些方案进行了优化。在这些方案中，由于IL和分隔壁色谱柱的优势，EDWC无疑是最好的方案。与CED流程相比，它可以将TAC减少22.19％，总资本成本减少31.47％，₂排放降低了7.7％。此外，计算结果表明，所采用的优化方法对复杂蒸馏系统的优化设计非常实用，具有直接，高效，鲁棒和全局最优的优点。