Static and Dynamic Intensification of Water–Ethylene Glycol Separation Using a Dividing Wall Column

Yan, Lingqing; Witt, Paul M.; Edgar, Thomas F.; Baldea, Michael

doi:10.1021/acs.iecr.0c06139

Static and Dynamic Intensification of Water–Ethylene Glycol Separation Using a Dividing Wall Column

Journal Article · Mon Feb 15 00:00:00 EST 2021 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/acs.iecr.0c06139· OSTI ID:1765694

Yan, Lingqing ^[1]; Witt, Paul M. ^[2]; Edgar, Thomas F. ^[3]; ^[3]

Univ. of Texas, Austin, TX (United States); The University of Texas at Austin
The Dow Chemical Company, Midland, MI (United States)
Univ. of Texas, Austin, TX (United States)

This paper makes several first-of-a-kind contributions toward “double intensification” (static/dynamic) of distillation systems, focusing in particular on the energy-intensive separation of a mixture of water and ethylene glycols. First, we demonstrate that a dividing wall column (DWC) can be an appropriate choice for separating wide-boiling zeotropic mixtures. Additionally, we show that the conventional DWC configuration where the wall is in the “middle” should be discarded in favor of a less frequently encountered “common-bottom” setup. For the mixture considered, choosing a DWC in lieu of a conventional two-column sequence can lead to over 6% energy cost savings and a 5% reduction in the number of stages compared to the conventional direct sequence two-column counterpart. The second part of this paper focuses on applying the previously introduced concept of dynamic process intensification to the DWC, the first time that such an effort is reported in the literature, to our knowledge. Here, we show that an additional 1.4% energy savings can be unlocked in this way, and confirm the stable operation of the column via dynamic simulation.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0007888

OSTI ID:: 1765694

Journal Information:: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 7 Vol. 60; ISSN 0888-5885

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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