Energy-Efficient Design of a Novel Double Annular Separation Column Using Pinch Pressure

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This study introduces a pinch-based method to design an internally heat-integrated pressure swing distillation (HIPSD) with a double annular column. In the configuration, the annular stripping section of a low-pressure (LP) column partially wraps around the rectifying section of an inner high-pressure (HP) column to minimize exergy loss. In order to enable adequate heat transfer and azeotropic separation, the key factor is setting the pressure of the columns by considering the so-called pinch pressure, which is determined by the minimum temperature approach and circumvention of the azeotropic boundary. This heat integration between two individual columns reflects different overall heat transfer coefficients for each stage, because they are affected by the composition of the fluid and its hydrodynamic characteristics. Each column is also sized to meet hydraulic conditions to ensure separation efficiency. The HIPSD of several azeotropic mixtures was described and the maximum energy savings reached 23.80%.
Publisher
AMER CHEMICAL SOC
Issue Date
2020-08
Language
English
Article Type
Article
Citation

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, v.59, no.32, pp.14398 - 14409

ISSN
0888-5885
DOI
10.1021/acs.iecr.0c01683
URI
http://hdl.handle.net/10203/276095
Appears in Collection
CBE-Journal Papers(저널논문)
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