碳酸二甲酯-甲醇共沸体系的节能分离技术研究进展OA

Dimethyl carbonate(DMC),as a crucial green chemical intermediate and solvent for lithium battery electrolytes,in production,DMC and methanol(MeOH)often form an azeotrope with pinch regions,making separation difficult and energy-intensive.The DMC/MeOH composition varies with synthesis routes,including transesterification,oxidation carbonylation,urea alcoholysis,and direct CO₂ synthesis,directly influences separation complexity,energy demand,and technology applicability.Therefore,research and investigation of energy-efficient separation technologies tailored to different feed characteristics are urgently needed.To address this,this systematic review examines the mechanisms,key parameters,and application characteristics of four mainstream separation technologies for DMC/MeOH azeotropic systems:pressure swing distillation,azeotropic distillation,extraction distillation,and membrane separation.It focuses on analyzing the adaptability patterns of these technologies based on different feed compositions.For a low concentration of DMC feeding,extractive distillation demonstrates operational flexibility and economic advantages.For the high-concentration DMC feedstocks(near the azeotropic composition),heterogeneous azeotropic distillation and pressure swing distillation become more competitive.Membrane coupling technology provides crucial support for energy-saving separation.It also prospects that the research and development focus will be on the integrated process of coupling distillation with low-cost green membrane materials and other separation media to promote the production of energy-saving and low-carbon DMC.