Simulation Of The Vinyl Chloride Rectification Process With Aspen Plus

At present there are two processes of the VCM synthesis according to the source of material, one is synthesized by calcium carbide and acetylene, the other is ethylene oxychlorination. The cost of the latter is going up with the crude oil price, while the traditional calcium carbide and acetylene method is relatively cheaper. So most domestic factories are encouraged to expand the current equipments and enlarge the production scale.We represent the model of VCM distillation process using Aspen Plus, including the units of compress, total condenser, last condenser, low-boiler tower and high-tower, to improve the product quality and reduce cost. The simulation result will be compared with the data from the plant, and the simulation results were in good agreement with the plant data. The operation parameters of the high-boiler tower and the low-boiler tower, such as feed location, reflux ratio and distillate to feed ratio were optimized on the basis of sensitivity analysis. The policy could be introduced and might bring factories great profit.Finally, the distillation system of PVC and the high boiler, as well as the low boiler operation parameter, were optimized. On the precondition of guaranteeing the purity of products, the cool energy consumption of the condenser of the low boiler was reduced by 33.15%, whereby the steam consumption of the reboiler by 29.41%. The operation expense of the low boiler was reduced greatly and the cost of VCM products was also decreased.Calcium carbide and acetylene distillation process was simulated and optimized, which is instructive for the industrial production and expansion of current VCM equipment.