Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (4): 896-904.doi: 10.1016/j.cjche.2018.11.023

• Process Systems Engineering and Process Safety • Previous Articles     Next Articles

Temperature inferential control of a reactive distillation column with double reactive sections

Lijing Zang, Kejin Huang, Ting Guo, Yang Yuan, Haisheng Chen, Liang Zhang, Xing Qian, Shaofeng Wang   

  1. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2018-09-18 Revised:2018-11-18 Online:2019-04-28 Published:2019-06-14
  • Contact: Kejin Huang
  • Supported by:
    Supported by the National Natural Science Foundation of China (21376018, 21576014, 21676011, 21808007, and 21878011), the Fundamental Research Funds for the Central Universities (ZY1837) and China Postdoctoral Science Foundation (2017M620587).

Abstract: Temperature inferential control (TIC) is studied for a reactive distillation column with double reactive sections (RDC-DRSs) processing a hypothetical two-stage consecutive reversible reaction (A + B ⇌ C + D, C + B ⇌ E + D with αD > αB > αC > αA > αE). Because of the complicated dynamic behaviors, the controlled stages by sensitivity analysis lead to great steady-state deviations (SSDs) in top and bottom product purities. Since TIC involves considerably reduced settling times in comparison with direct composition control, small SSDs in product qualities correspond generally to small transient deviations (TDs) in product qualities. An objective function that measures SSDs in product qualities is formulated to represent the performance of a TIC system and an iterative procedure is devised to search for the best control configuration. The application of the procedure to the RDC-DRS gives considerably suppressed TDs and SSDs in top and bottom product qualities as compared with the one by sensitivity analysis. The method is simpler in principle and less computationally intensive than the current practice. These striking outcomes show the effectiveness of the proposed principle for the development of TIC systems for complicated reactive distillation columns.

Key words: Reactive distillation column, Temperature inferential control, Sensitivity analysis, Transient deviation, Steady-state deviation