Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (8): 1670-1676.doi: 10.1016/j.cjche.2017.10.029

• Selected Papers from the Chinese Process Systems Engineering Annual Meeting 2017 • Previous Articles     Next Articles

Investigation of the operability for four-product dividing wall column with two partition walls

Xiaolong Ge1, Botong Liu2, Botan Liu1, Hongxing Wang1, Xigang Yuan2   

  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:2017-08-26 Online:2018-08-28 Published:2018-09-21
  • Contact: Xiaolong Ge,E-mail;Xigang Yuan,E-mail;
  • Supported by:

    Supported by Open Research Project of State Key Laboratory of Chemical Engineering (SKL-ChE-16B06) and Yangtze Scholars and Innovative Research Team in Chinese University (IRT-17R81).

Abstract: For separating some specific four component mixtures into four products, the four-product dividing wall column (FPDWC) with two partition walls can provide the same utility consumption with the extended Petlyuk configuration, although with structure simplicity. However, the reluctance to implement this kind of four product dividing wall column industrially also consists in the two uncontrollable vapor splits associated with it. The vapor split ratios are set at the design stage and might not be the optimal value for changed feed composition, thus minimum energy consumption could not be ensured. In the present work, a sequential iterative optimization approach was initially employed to determine the parameters of cost-effective FPDWC. Then the effect of maintaining the vapor split ratios at their nominal value on the energy penalty was investigated for the FPDWC with two partition walls, in case of feed composition disturbance. The result shows that no more than +2% above the optimal energy requirements could be ensured for 20% feed composition disturbances, which is encouraging for industrial implementation.

Key words: Distillation, Four-product dividing wall column, Vapor split, Operability