Improved solution thermodynamics modeling in pervaporation

Anilkumar, A and Roy, Y (2024) Improved solution thermodynamics modeling in pervaporation. In: Chemical Engineering Science, 299 .

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Abstract

The current work features a system-level design of pervaporation processes (typically utilized to break azeotropes) that is solution thermodynamics-based (inclusive of validated excess thermodynamic properties). Unlike the standard pervaporation modeling methodology in the literature, the current method (referred to here as PervapS3) deconstructs the membrane module into its constituent units, and the material and energy flows were mathematically validated. These amendments to the previous methodology (i.e., leaf-wise modeling, mathematical validation, and inclusion of excess thermodynamic properties) revealed significant deviations in key parameter values. For a given large-scale pervaporation process dehydrating aqueous isopropanol, the total membrane area and energy requirement calculated were up to 22 and 19 less than the values calculated using the previous methodology. Moreover, due to the inclusion of excess thermodynamic properties in the PervapS3 method, the minimum separation work and the second law (thermodynamic) efficiency were up to 94 and 78 less. In other words, the previous pervaporation modeling methodology overestimated membrane area, energy requirement, minimum separation work, and second law efficiency. Considering a conventional azeotropic distillation process for comparison with pervaporation, it was observed that the simulation-based distillation models from the literature were inclusive of the system non-idealities. Per the previous method, the non-ideal second law efficiency of azeotropic distillation would be compared against the ideal second law efficiency of pervaporation, overestimating the latter. The non-ideal second law efficiency must be employed to facilitate a fairer and more accurate comparison of disparate separation technologies. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Chemical Engineering Science
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the publishers.
Keywords:	Azeotropes; Distillation; Evaporation; Thermodynamic properties, 'current; Breaking azeotrope; Breakings; Energy requirements; Membrane area; Modeling methodology; Second law efficiencies; Separation work; Solution thermodynamics; Thermodynamics property, Pervaporation
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited:	18 Oct 2024 04:56
Last Modified:	18 Oct 2024 04:56
URI:	http://eprints.iisc.ac.in/id/eprint/86370

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