Simulation on the process of recovering high purity N-methyl-2-pyrrolidinone(NMP)from waste solvent by three-column distillation
The recovery process of high purity N-methyl-2-pyrrolidinone(NMP)from waste organic solvents in resin production process by three-column vacuum distillation was researched.The waste solvent raw materi-al was successively subjected to crude dehydration,precision dehydration and product refinement process to separate impurities such as water and resin,and obtain high purity NMP products.The influences of the num-ber of stages,the feed stage and the reflux ratio of the distillation column on the dehydration efficiency of the raw material and the purity of the product were analyzed by Aspen Plus software.The results showed that through process simulation and optimization,the electronic grade product with NMP mass fraction of more than 99.90%and water mass fraction of less than 0.01%could be obtained after dehydration and refining of raw materials.The product yield was 97.6%,and the energy consumption of the distillation system was 2.75 MJ/kg product.The optimization results provide a reference for the purification of NMP products from waste organic solvents.
NMPwaste solvent recoverycontinuous distillationprocess simulationAspen Plus
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