Simulation and Optimization of the Separation Process of Light Components in Methylchlorosilanes.

The simulation and optimization was conducted with Aspen Plus on the distillation process for light components in 300,000 tons peryear methylchlorosilane unit. Firstly, WILSON model was selected based on root-mean-square errors (SEs) and absolute average deviation by the experimental data of gas-liquid equilibrium for methylchlorosilanes and the predictions of different thermodynamic models. By comparative analysis of simulation results in different tower sequence, a preferred scheme was that using the original azeotropic tower to prioritize the separation of trimethylchlorosilane, and then the original hydrogen tower and trimethyl tower were connected in series to separate methyl dichlorosilane. The results show that the purity of the methyldichlo-rosilane stream reaches 99.60% with a yield of 99.59%, while the purity of the trimethylchlorosilane stream reaches 99.80% with a yield of 98.40%, with the residual azeotropic flow rate of 68. 34 kg/h, and the total energy consumption of 2361 kW. Additionally, the result verifiy its feasibility by hydraulic analysis. [ABSTRACT FROM AUTHOR]