关键词: 模拟, 分壁式精馏塔, 丁二烯, 蒸馏, 优化

Abstract: Butadiene is an important petrochemical olefin raw material. Due to the high energy consumption, energy saving has become the focus in the butadiene production process research. This research simulated the two butadiene distillation processes using Aspen Plus software, and investigated the influences of intraconnection stage, vapor and liquid flow of side column and reflex ratio on the separation effect and reboiler duty in dividing wall column(DWC). This research also compared the energy consumption of the DWC process and the conventional process under the same separation conditions and analyzed the reason why DWC can save energy according to the butadiene concentration distribution in the liquid of columns. The results showed that the separation effect of DWC was the best and the butadiene concentration was up to 99.7% when the number of theoretical plates in main column was 105, the number of theoretical plates in side column was 56, vapor flow was 1020 kmol/h, liquid flow was 890 kmol/h and reflux ratio was 7800. This study provided the theoretical basis for the industrialization of DWC butadiene distillation process. As DWC can avoid the backmixing effectively and enhance the energy efficiency, the condenser and reboiler of DWC process can save energy up to 29.36% and 29.19% respectively.

Key words: simulation, dividing wall column, butadiene, distillation, optimization