关键词: 模拟, 分离, 优化, 隔壁塔

Abstract: This research investigated the separation of products mixture of dichlorosilane,trichlorosilane and silicon tetrachloride in the trichlorosilane synthesis process with the divided wall column instead of the conventional distillation sequences. The influences of reflux ratio,divided wall location,feed location,side-draw location,liquid split ratio and vapor split ratio on the mole fraction of distillate,side-draw and bottom products were simulated by Aspen Plus,and the optimal technological parameters were obtained. The energy consumption of separating the mixture mentioned above was compared between the divided wall column and the conventional distillation sequences. The simulation results showed that the separation effect was optimal when the reflux ratio was 6,divided wall was located the 8th stage and the 24th stage of main column,feed location was the 10th stage of prefractionator,side-draw location was the 15th stage of main column,liquid split ratio was 0.21 and vapor split ratio was 0.5. The mole fraction of trichlorosilane product can reach 99.999% under the above conditions. Compared with conventional distillation sequences,the reboiler duty and condenser duty of the divided wall column could be reduced more than 29.09% and 29.48% respectively.

Key words: simulation, separation, optimization, divided wall column