›› 2017, Vol. 25 ›› Issue (8): 1069-1078.doi: 10.1016/j.cjche.2017.03.018

• Article • Previous Articles     Next Articles

Application of the dividing wall column to olefin separation in fluidization methanol to propylene (FMTP) process

Xiaolong Ge1,2, Botong Liu2, Xigang Yuan2, Yiqing Luo2, Kuo-Ksong Yu2   

  1. 1 College of Chemical Engineering and Materials and Science, Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin University of Science and Technology, Tianjin 300457, China;
    2 State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300354, China
  • Received:2016-09-27 Revised:2016-11-26 Online:2017-08-28 Published:2017-09-11
  • Supported by:
    Supported by Open Research Project of State Key Laboratory of Chemical Engineering (Grant No. SKL-ChE-16B06).

Abstract: Dividing wall column (DWC) is shown to be energy efficient compared to conventional column sequence for multi components separation, which is used for olefin separation in fluidization methanol to propylene process in the present work. Detailed design for pilot DWC was performed and five control structures, i.e. composition control (CC), temperature control (TC), composition-temperature control (CC-TC), temperature difference control (TDC), double temperature difference control (DTDC) were proposed to circumvent feed disturbance. Sensitivity analysis and singular value decomposition (SVD) were used as criterion to select the controlled temperature locations in TC, CC-TC, TDC and DTDC control loops. The steady simulation result demonstrates that 25.7% and 30.2% duty can be saved for condenser and reboiler by substituting conventional column sequence with DWC, respectively. As for control structure selection, TC and TDC perform better than other three control schemes with smaller maximum deviation and shorter settling time.

Key words: Distillation, Dividing wall column, Olefin separation, Detailed design, Process control