Mass transport and thermodynamic analysis of PAHs in partitioning systems in the presence and absence of ultrasonication

Transport of PAHs from Desmopan polymers to methanol under various mixing conditions and in the presence of ultrasound was analyzed. PAH transport was influenced by external transport resistances; however, agitation greater than 800 rpm yielded PAH transport completely limited by internal resistance...

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Bibliographic Details
Published in:AIChE journal 2010-10, Vol.56 (10), p.2717-2726
Main Authors: Isaza, Pedro A, Daugulis, Andrew J, Karan, Kunal
Format: Article
Language:English
Subjects:
Applied sciences
Aqueous chemical equilibrium
Aqueous solutions
Chemical engineering
Diffusion
equilibrium
Exact sciences and technology
Heat and mass transfer. Packings, plates
mass transfer
Mathematical models
Methyl alcohol
PAHs
Partitioning
Polyallylamine hydrochloride
Polymers
solid-liquid partitioning systems
Thermodynamics
Transport
Ultrasound
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Summary:Transport of PAHs from Desmopan polymers to methanol under various mixing conditions and in the presence of ultrasound was analyzed. PAH transport was influenced by external transport resistances; however, agitation greater than 800 rpm yielded PAH transport completely limited by internal resistances. Delivery rates of phenanthrene, fluoranthene, and pyrene with ultrasonication were faster than that under any mixing condition, suggesting enhanced internal transport properties. Ultrasound also induced increased concentrations of PAHs in solution at equilibrium. The model developed described PAH delivery under sonicated/non-sonicated conditions, while quantifying diffusive and thermodynamic properties. Diffusivities with and without ultrasound decreased with permeant molecular size agreeing with coefficients determined for similar aromatic compounds in polymers. Partitioning coefficients under sonicated and non-sonicated conditions conclusively differed from each other and decreased as a function of PAH molecular size. Quantitative structure-property relationship data of PAHs yielded factors predicting thermodynamic and transport behaviors, with polarizability being the best descriptor. © 2010 American Institute of Chemical Engineers AIChE J, 2010
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.12168