Study On Methyl Methacrylate Crude Monomer Distillation Process

Methyl methacrylate is one of the important organic chemical raw materials,which has good application prospects and development prospects.Methyl methacrylate has many production route.One of the routes for Methyl methacrylate production is by recycling acrylic plastics.This process can reuse waste acrylic plastics while product valuable products,thus has better economic and social benefits.However,research on the separation process of crude products from pyrolysing methyl methacrylate is limited.In order to provide references for the industrial production of seperation of the methyl methacrylate crude monomer,two processes were developed in this paper.A two-column process was devised first.The simulation flow was established Starting from the theoretical model,then through the physical property analysis and selection of thermodynamic method.With the total annual cost as the objective function,the optimal operation parameters were determined by the cyclic iteration procedure,case comparison and single factor verification.Results show that in order to achieve 99.8%(wt.%)of methyl methacrylate product purity,and to ensure the best economic benefits,the total stages and feed stage of light components removal column should be set at 59 and 27,reflux ratio was 39.5;the total stages and feed stage of heavy components removal column should be set at 56 and 40,reflux ratio was 1.35.After the optimization,the annual utilities cost was 267.96(10~3$,the same below),the fixed capital investment was 1000.5 and the total annual cost was 568.11.A dividing wall column process was developed based on the result of the two-column process.The global economic optimization was carried out by a cyclic iteration procedure and using the total annual cost as the objective function.It was fond that in order to satisfy the separation requirements and get best economic benefits,the number of stages in the main column and divided wall section should be set at 91 and 50,location of the divided wall was 26,location of the feed stage was 41,location of the side stream stage was 61,and the reflux ratio was 41.54.After the optimization,the annual utilities cost was 151.15(10~3$,the same below),the fixed capital investment was 967 and the total annual cost was 441.25.It was revealed that,for satisfying the same separation requirements,dividing wall column process requires 43.5%less energy and 22.3%less total annual cost compared to the two-column process,which has obvious advantages.