Nonlinear Flux−Pressure Behavior of Solvent Permeation through a Hydrophobic Nanofiltration Membrane.

Jyoti, Lavania and Navin, K. Rastogi and Manohar, B. and Subramanian, R. (2021) Nonlinear Flux−Pressure Behavior of Solvent Permeation through a Hydrophobic Nanofiltration Membrane. ACS Omega, 6. pp. 27052-27061.

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Abstract

Nonpolar solvents have been reported to exhibit a nonlinear flux− pressure behavior in hydrophobic membranes. This study explored the flux−pressure relationship of six nonpolar solvents in a lab-cast hydrophobic poly- (dimethylsiloxane) (PDMS) membrane and integrated the permeance behavior in the evaluation of the proposed transport model. The solvents exhibited a nonlinear relationship with the applied pressure, along with the point of permeance transition (1.5−2.5 MPa), identified as the critical pressure corresponding to membrane compaction. Two classical transport models, the pore-flow model and solutiondiffusion model, were evaluated for the prediction of permeance. The solutiondiffusion model indicated a high correlation with the experimental results before the point of transition (R2 = 0.97). After the point of transition, the compaction factor (due to membrane compaction after the critical pressure) derived from the permeance characteristics was included, which significantly improved the predictability of the solution-diffusion model (R2 = 0.91). A nonlinear flux−pressure behavior was also observed in hexane−oil miscella (a two-component system), confirming the existence of a similar phenomenon. The study revealed that a solution-diffusion model with appropriate inclusion of compaction factor could be used as a prediction tool for solvent permeance over a wide range of applied transmembrane pressures (0−4 MPa) in solvent-resistant nanofiltration (SRNF) membranes.

Item Type:	Article
Uncontrolled Keywords:	nonpolar solvents, Membrane processing, solvent resistant nanofiltration
Subjects:	600 Technology > 08 Food technology > 07 Food Engineering
Divisions:	Food Engineering
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	29 Mar 2022 08:32
Last Modified:	29 Mar 2022 08:32
URI:	http://ir.cftri.res.in/id/eprint/15154

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