The solution-diffusion with imperfections model as a method to understand organic solvent nanofiltration of multicomponent systems

Fierro, Daniel; Boschetti‐de‐Fierro, Adriana; Abetz, Volker

doi:10.1016/j.memsci.2012.04.027

Cited by 34 publications

(12 citation statements)

References 41 publications

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“…The solvent permeability calculated with the new model correlated well with the experimental data of both hydrophilic and hydrophobic NF membranes over the entire range of solvents used (including both high‐polar solvents and apolar solvents), which confirmed that the assumption of convective‐diffusive transfer in SRNF membranes is valid. Many other comprehensive models have been proposed, such as the coupled series–parallel resistance model as well as mechanistic, chemometric, and hybrid models, which are not discussed in this review …”

Section: Mass Transfer Of Polymeric Srnf Membranesmentioning

confidence: 99%

Recent Advances in Polymeric Solvent‐Resistant Nanofiltration Membranes

et al. 2014

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When considering energy consumption and environmental issues, solvent-resistant nanofiltration (SRNF) based on polymeric materials emerges as a process for substituting conventional separation processes of organic solutions, such as distillation, which consume high amounts of energy. Because SRNF does not involve phase transition, this process can potentially decrease the energy consumption and solvent waste and increase the yield of active components. Such improvements could significantly benefit a number of fields, such as pharmaceutical manufacturing and catalysis recovery, among others. Therefore, SRNF has gained a lot of attention since the recent introduction of solvent-stable polymeric materials in the manufacture of nanofiltration membranes. The membrane materials and the membrane structures depending on the fabrication methods determine the separation performance of polymeric SRNF membranes. Therefore, this article gives a comprehensive overview of the current state-of-art technologies of generating membrane materials and corresponding fabrication methods for SRNF membranes made from polymeric materials expected to provide the most benefit. The transport mechanisms and the corresponding models of SRNF membranes in organic media are also reviewed to better understand the mass transfer process. Various SRNF applications, such as in pharmaceutical and catalyst, among others, are also discussed. Finally, the difficulties and future research directions to overcome the challenges faced by SRNF processes are proposed. C

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Section: Mass Transfer Of Polymeric Srnf Membranesmentioning

confidence: 99%

Recent Advances in Polymeric Solvent‐Resistant Nanofiltration Membranes

et al. 2014

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“…Several alternatives are proposed to obtain transport equations for the nanofiltration membranes: the solution‐diffusion model, the solution‐diffusion with imperfections, the Kedem–Katchalsky model, or the Spiegler–Kedem model . According to the previous experience of this research group taken after testing different models to represent the performance of low‐pressure reverse osmosis membranes, the Kedem–Katchalsky model can be considered as an attractive option to simulate the transport through nanofiltration membranes.…”

Section: Continuous Process Modelingmentioning

confidence: 99%

Analysis and optimization of continuous organic solvent nanofiltration by membrane cascade for pharmaceutical separation

2014

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The major part of the production costs of pharmaceuticals can be imputed to the downstream processing, where membrane technologies have to deal with some challenges as separations involving solutes with similar sizes or solvent recovery and recycling. This work contributes to the progress in the design of continuous organic solvent nanofiltration systems for this purpose and includes the configuration of dual membrane cascades, sensitivity analysis of the operation variables, and economic optimization as innovations. Analyzed configurations include multistage cascades up to three stages, and dual membrane cascades up to five stages. The total costs (TC) were chosen as the formulated objective function to minimize in the economic optimization strategy. The treatment of the residual stream leaving the system resulted the main cost of the process (more than 85% for dual cascades), but the solvent recovery units can significantly reduce the TC (64-77% depending on the required solvent quality).

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“…Some models, like the resistance-in-series, solutiondiffusion, solution diffusion with imperfection (SDI) or combination of them, have been built to describe solvent transport in SRNF so far. [5][6][7][8][9][10][11][12][13][14][15] Within these existing models, only models based on the solution-diffusion mechanism will be introduced, since in the rst part it was demonstrated that the mass transfer should be a typical solution-diffusion one to achieve separation. Within these solution-diffusion based models, Bhanushali et al 6 rstly presented a valuable one to describe the solvent ux of SRNF membranes, as eqn (1) and (2) shows.…”

Section: Introductionmentioning

confidence: 99%