NMP萃取精馏分离醋酸和水的过程模拟

Simulation Study of the Separation of Acetic Acid and Water by Extractive Distillation with NMP

利用化工模拟软件Aspen Plus采用萃取精馏法,以N-甲基吡咯烷酮(NMP)为萃取剂,对生产中醋酸和水分离进行了模拟计算,并与普通精馏法进行比较。结果表明,NMP是一种良好的萃取剂,能够很好的实现醋酸和水的分离;与普通精馏法相比,同样分离指标下萃取精馏法的能耗降低了69.8%,每吨醋酸蒸汽消耗量由10.5 t降低至3.2 t,表明萃取精馏分离醋酸和水,节能显著,优于普通精馏,为醋酸和水分离的优化操作和设计提供依据。

The process simulation software Aspen Plus was used to simulate the extractive distillation in the separation of acetic acid and water,and N-Methyl pyrrolidone（NMP） was used as extractive agent.The simulation results showed that NMP is a good extractive solvent,which can high efficiently separate acetic acid and water by extractive distillation,and extractive distillation was superior to conventional distillation in separation of acetic acid and water,which the heat duties of reboiler was reduced by 69.8 %,and the corresponding heating steam was reduced from 10.5 tons to 3.2 tons per ton acetic acid produced.The results could be provided for the design and operation of the separation of acetic acid and water in its industrial production.