Controllability features of dividing-wall columns

Ariella Janka Tarjani, Andras Jozsef Toth, Tibor Nagy, Eniko Haaz, Daniel Fozer, Anita Andre, P. Mizsey

Research output: Chapter in Book/Report/Conference proceedingChapter


The dividing wall columns have they renascence, however, there is lack of comprehensive investigation of column with upper and lower positioned walls. Previous work presented the energy efficiencies of dividing wall columns compared to common and energy integrated column structures. This paper presents a comprehensive study of controllability features based on frequency dependent controllability indices and their aggregation in the so called "desirability function". Conventional distillation column sequences and dividing-wall columns are selected for the study. A total of six different distillation arrangements are considered separating three ternary alcohol mixtures with different eases of separation. Rigorous simulations are carried out using Aspen Plus and Aspen Dynamics. Linear state-space representations of the studies systems are obtained using the Control Design Interface. Frequency dependent controllability indices, MRI, CN and RGAno, are calculated by MATLAB. Based on open-loop responses, discrete frequencies are chosen to determine characteristic indices of the systems. Evaluation of the results is supported by the desirability function. The results show that the separated mixtures influence the controllability features. However, from the different results of our work, we select that if indirect separation structure is recommended, DWC with lower partition shows considerable enhancement in controllability properties.

Original languageEnglish
Title of host publicationChemical Engineering Transactions
PublisherItalian Association of Chemical Engineering - AIDIC
Number of pages6
ISBN (Print)9788895608662
Publication statusPublished - Jan 1 2018


ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Tarjani, A. J., Toth, A. J., Nagy, T., Haaz, E., Fozer, D., Andre, A., & Mizsey, P. (2018). Controllability features of dividing-wall columns. In Chemical Engineering Transactions (Vol. 69, pp. 403-408). Italian Association of Chemical Engineering - AIDIC.