Two energy efficient extractive distillation processes are proposed to separate acetonitrile/1,4-dioxane/water mixture in this study. The COSMO-SAC model is chosen to screen suitable entrainer and dimethyl sulfoxide is selected. Process intensification technologies of heat pumps and heat integration are utilized in the processes for energy conservation. Several evaluation methods containing energy, economic, environmental and exergetic analysis are introduced to evaluate the performance of different processes. The most energy-saving and environmental friendly process is heat pump assisted direct extractive distillation that achieves an energy reduction by 53.58% and a carbon dioxide emission reduction by 53.56% compared to the indirect scheme, while the direct scheme assisted with heat integration performs best that achieves a reduction by 40.38% on total annual cost.

在本研究中，提出了两种高效的萃取蒸馏工艺来分离乙腈/1,4-二恶烷/水混合物。选择 COSMO-SAC 模型来筛选合适的夹带剂并选择二甲基亚砜。在节能过程中采用了热泵和热集成的过程强化技术。介绍了包括能源、经济、环境和火用分析在内的几种评估方法，以评估不同过程的性能。最节能环保的工艺是热泵辅助直接萃取精馏，与间接方案相比，节能53.58%，二氧化碳排放量减少53.56%，而带热集成辅助的直接方案效果最好。实现减少40。