Recent Applications of Organic Solvent Nanofiltration

Priske, Markus; Lazar, Marina; Schnitzer, Christian; Baumgarten, G.

doi:10.1002/cite.201500084

Cited by 85 publications

(39 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…from vegetable oil processing have been reviewed from an industrial viewpoint. [14] MEK-Toluene Polyimide based [13] [* 1 In studies where more than one species is retained by the solvent recovery membrane, the rejection and corresponding molecular weight of the least rejected impurity is given.] [* 2 The exact structures were not disclosed in these publications.…”

Section: Application Of Solvent Recoverymentioning

confidence: 99%

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

Schaepertoens

Didaskalou

Kim

et al. 2016

Journal of Membrane Science

View full text Add to dashboard Cite

For separation of a two-component mixture, a three-stage organic solvent nanofiltration (OSN) process is presented which comprises of a two-stage membrane cascade for separation with a third membrane stage added for integrated solvent recovery, i.e. solvent recycling. The two-stage cascade allows for increased separation selectivity whilst the integrated solvent recovery stage mitigates the otherwise large solvent consumption of the purification. This work explores the effect of washing the solvent recovery unit at intervals in order to attain high product purities with imperfect solvent recovery membranes possessing less than 100 % rejection of the impurity. This operation attains a purity of 98.7 % through semi-continuous operation with two washes of the solvent recovery stage, even when imperfect membranes are used in a closed-loop set-up. This contrasts favourably with the 83.0 % maximum purity achievable in a similar set-up with a single continuous run. The process achieves slightly lower (-0.7 %) yield of around 98.2 % compared to a continuously operated process without solvent recovery but consumes approx. 85 % less solvent (theoretical analysis suggests up to 96 % reduction is possible). 9 different membranes, both commercial (GMT, Novamem, SolSep) and in-house fabricated, are screened and tested on a separation challenge associated with the synthesis of macrocycles -amongst the membrane materials are polyimide (PI), polybenzimidazole (PBI) and, polyetheretherketone (PEEK).3

show abstract

Section: Application Of Solvent Recoverymentioning

confidence: 99%

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

Schaepertoens

Didaskalou

Kim

et al. 2016

Journal of Membrane Science

View full text Add to dashboard Cite

show abstract

“…Small molecules ( M w = 200–1000 Da) must be effectively separated from the organic solvent media . This harsh environment requires the polymeric membranes with superior organic solvent stability, well‐defined pore size, and narrow aperture‐size distribution . Some strategies have been applied to control the pore size and create more interconnected voids by adding nanofillers with defined cavities, such as metal–organic framework (MOF), covalent organic framework (COF), porous aromatic framework, graphene oxide, carbon nanotube, and polyhedral oligomeric silsesquioxane .…”

mentioning

confidence: 99%

Precise Molecular Sieving Architectures with Janus Pathways for Both Polar and Nonpolar Molecules

et al. 2018

View full text Add to dashboard Cite

Precise molecular sieving architectures with Janus superhighways are constructed via a molecularly engineered interfacial reaction between cyclodextrin (CD) and trimesoyl chloride (TMC). Interestingly, the CD/TMC nanofilms constructed with both hydrophobic inner cavities and hydrophilic channels exhibit exceptionally high permeances for both polar and nonpolar solvents. The precise molecular sieving functions are determined by the type of CD building blocks and the inner cavities of intrinsic 3D hollow bowls. Positron annihilation spectroscopy (PAS) confirms that a larger inner CD cavity tends to generate a larger free volume and higher microporosity. Based on the rejection ratio of various dyes, the estimated molecular weight cutoff of CD/TMC nanofilms follows the trend of α-CD/TMC (320 Da) <β-CD/TMC (400 Da) <γ-CD/TMC (550 Da), which is in strict accordance with the orders of their free volumes measured by PAS and inner cavity sizes of α-CD <β-CD <γ-CD. This kind of novel CD/TMC molecular sieving membrane with intrinsic microporosity containing tunable pore size and sharp pore-size distribution can effectively discriminate molecules with different 3D sizes.

show abstract

“…Because simple alcohols are such common solvents industrially and one of the uses of OSN is the recovery of organic solvents, it is appropriate to understand the stability of our synthesized MOF in these solvents. We used IPA as a simple benchmark alcoholic solvent and immersed the 10× Zn(BDC) membranes in IPA for different durations before removing them for XRD analysis.…”

Section: Resultsmentioning

confidence: 99%

“…OSN is a membrane‐based separation process characterized by its operation in a variety of organic media with the ability to retain solutes 0.5–2 nm in size, corresponding to a molecular weight cut‐off of approximately 200–1000 g mol −1 . Typically operated under mild temperatures and possibly even at low pressures, OSN is advantageous because of its relatively lower energy consumption compared to some conventional separation processes such as distillation . More importantly, the annual use of organic solvents across the word is on a megaton‐scale; these solvents easily account for up to 90 % of the mass involved in batch chemical operations .…”

Section: Introductionmentioning

confidence: 99%

Green Layer‐by‐Layer Method for the Preparation of Polyacrylonitrile‐Supported Zinc Benzene‐1,4‐dicarboxylic Acid Membranes

et al. 2018

View full text Add to dashboard Cite

Ultrafiltration-level polyacrylonitrile (PAN) flat sheet membranes were chemically modified through cross-linking and hydrolysis to provide a suitable surface for the growth of a selective layer composed of a Zn benzene-1,4-dicarboxylic acid (Zn(BDC)) metal-organic framework (MOF). Unlike typical membrane modification methods or conventional MOF synthesis procedures, deionized (DI) water was the only solvent used for each of the modification steps. To better understand the layer-by-layer MOF growth process, several MOF growth conditions were also studied, including the effects of solution concentration, growth temperature, membrane immersion time and the number of layers. Subsequently, organic solvent nanofiltration (OSN) was used to test the effectiveness of the modifications and compare the performances of the fabricated membranes. With the appropriate combination of the MOF growth conditions, the layer-by-layer method was used to produce an OSN membrane with an isopropanol permeance of 2.39 L m h bar and an 86 % rejection of the dye Brilliant Blue R (M 825.97 g mol ).

show abstract

Recent Applications of Organic Solvent Nanofiltration

Cited by 85 publications

References 39 publications

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

Precise Molecular Sieving Architectures with Janus Pathways for Both Polar and Nonpolar Molecules

Green Layer‐by‐Layer Method for the Preparation of Polyacrylonitrile‐Supported Zinc Benzene‐1,4‐dicarboxylic Acid Membranes

Contact Info

Product

Resources

About