Abstract:

Vacuum batch extractive distillation is a potential technology for the separation of compounds with close boiling point and azeotropic mixtures. By using N，N-dimethylmethanamide（DMF）as a single extractive solvent and the mixture of DMF and dimethyl sulfoxide（DMSO）as a mixed solvent，the vacuum batch extractive distillation process for ethyl acetate-ethanol separation was simulated by a constant molar holdup model. The mathematical model is a group of stiff equations and was resolved by the pursuit method. The simulation agreed well with experiment results. The simulation results illustrated that vacuum operation could intensify the batch extractive distillation process.

摘要：

减压间歇萃取精馏是一种用于分离近沸点混合物及共沸物分离的极具发展潜力的技术。本文分别以N,N-二甲基甲酰胺作为简单溶剂和由N,N-二甲基甲酰胺与二甲基亚砜组成的混合物作为混合溶剂，建立了减压间歇萃取精馏分离乙酸乙酯和乙醇共沸体物系的过程数学模型，利用追赶法求解了描述该过程的一组刚性较强的方程组，并通过实验对所建模型进行了验证。结果表明，模拟计算结果与实验结果吻合较好。另外，通过图示，过程模拟结果表明减压操作能够强化萃取精馏的分离过程。