Reporting the unreported: the reliability and comparability of the literature on organic solvent nanofiltration

Phuong, Hai Anh Le; Blanford, Christopher F.; Székely, György

doi:10.1039/d0gc00775g

Cited by 66 publications

(31 citation statements)

References 42 publications

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“…The TFC membranes are usually prepared using different methods, solvent systems, diverse monomers, and some additives like a nanomaterial including zeolites, silicalites, quantum dots (QD), and graphene oxides (GO). Performance test is conducted under a cross-flow or dead-end configuration system with diverse parameters such as pressure, temperature, agitation rate, and different concentration of solutes in various solvents [ 88 ]. Performance in the RO system is easy to compare each other since the fixed concentration of sodium chloride in water and operation conditions have been used [ 88 ].…”

Section: Materials For Tfc Membranementioning

confidence: 99%

“…Performance test is conducted under a cross-flow or dead-end configuration system with diverse parameters such as pressure, temperature, agitation rate, and different concentration of solutes in various solvents [ 88 ]. Performance in the RO system is easy to compare each other since the fixed concentration of sodium chloride in water and operation conditions have been used [ 88 ]. However, it is very difficult to fairly compare membrane performance owing to more complex testing system with diverse solvent–solute combinations and operating conditions.…”

Section: Materials For Tfc Membranementioning

confidence: 99%

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Thin-Film Composite Nanofiltration Membranes for Non-Polar Solvents

et al. 2021

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Organic solvent nanofiltration (OSN) has been recognized as an eco-friendly separation system owing to its excellent cost and energy saving efficiency, easy scale-up in the narrow area and mild operation conditions. Membrane properties are the key part in terms of determining the separation efficiency in the OSN system. In this review paper, the recently reported OSN thin-film composite (TFC) membranes were investigated to understand insight of membrane materials and performance. Especially, we highlighted the representative study concepts and materials of the selective layer of OSN TFC membranes for non-polar solvents. The proper choice of monomers and additives for the selective layer forms much more interconnected voids and the enhanced microporosity, which can improve membrane performance of the OSN TFC membrane with reducing the transport resistance. Therefore, this review paper could be an important bridge to connect with the next-generation OSN TFC membranes for non-polar solvents.

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Section: Materials For Tfc Membranementioning

confidence: 99%

Section: Materials For Tfc Membranementioning

confidence: 99%

Thin-Film Composite Nanofiltration Membranes for Non-Polar Solvents

et al. 2021

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“…The use of dead-end configuration was due to its low volume requirement, cost-effectiveness and ease of operation. By using a dead-end configuration, researchers would have an ample resource allocation to obtain a rough performance estimate of a membrane separation, as a cross-flow filtration unit costs 10-20 times as compared to a dead-end filtration unit (Le Phuong et al, 2020). According to Shi et al (2019), it was found that the permeance values in cross-flow filtration was higher than that of dead-end filtration.…”

Section: Membrane Systemmentioning

confidence: 99%

Enrichment of carotene from palm oil by organic solvent nanofiltration

Ghazali

Hanim

Pahlawi

et al. 2021

J Americ Oil Chem Soc

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Palm oil is one of the richest sources of natural plant carotene with typical concentration of about 0.5-0.7 g/L. Unfortunately, during physical refining of palm oil, most of the carotenes were destroyed by high temperatures and this represents a loss of potential source of natural carotene. Various techniques have been developed to extract and recover carotenes from palm oil, however these processes often require high energy usage, and usually renders the oil useless for further consumption. Recently, organic solvent nanofiltration (OSN) has become an important method for molecular separation particularly for the separation of low molecular weight bioactive compounds. This work presents the application of OSN membranes for the separation of carotene from a crude palm oil/solvent system. Several commercial OSN membranes (DuraMem and PuraMem series) fabricated from polyimide were evaluated for their separation abilities. PuraMem 280 showed the best selectivity performance, with the concentration of carotene in permeate oil increased from 0.60 to 0.79 g/L when hexane was used as the solvent. Runs by using DuraMem 150, DuraMem 300 and DuraMem 500 showed low or no selectivity between carotene and triglyceride in all solvents. It was found that the rejection of carotene depends strongly on the type of solvents. A coupled solution diffusion and film theory was also utilized to model carotene transport through OSN membrane. It was demonstrated that OSN can serve as an alternative for the direct carotene recovery from palm oil and can be potentially applied for other minor compounds recovery from vegetable oils.

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“…Organic solvent nanofiltration (OSN), also called solvent-resistant nanofiltration (SRNF), is a pressure-driven sustainable separation technology applied in fine chemical and petrochemical purification, which can separate solutes between 50 and 2000 g mol −1 in a wide range of organic solvents [31]. OSN is a predictable and energy-efficient technology compared to other separation techniques such as distillation, chromatography, and extraction [32].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of C3-Symmetric Cinchona-Based Organocatalysts and Their Applications in Asymmetric Michael and Friedel–Crafts Reactions

et al. 2021

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In this work, anchoring of cinchona derivatives to trifunctional cores (hub approach) was demonstrated to obtain size-enlarged organocatalysts. By modifying the cinchona skeleton in different positions, we prepared four C3-symmetric size-enlarged cinchona derivatives (hub-cinchonas), which were tested as organocatalysts and their catalytic activities were compared with the parent cinchona (hydroquinine) catalyst. We showed that in the hydroxyalkylation reaction of indole, hydroquinine provides good enantioselectivities (up to 73% ee), while the four new size-enlarged derivatives resulted in significantly lower values (up to 29% ee) in this reaction. Anchoring cinchonas to trifunctional cores was found to facilitate nanofiltration-supported catalyst recovery using the PolarClean alternative solvent. The C3-symmetric size-enlarged organocatalysts were completely rejected by all the applied membranes, whereas the separation of hydroquinine was found to be insufficient when using organic solvent nanofiltration. Furthermore, the asymmetric catalysis was successfully demonstrated in the case of the Michael reaction of 1,3-diketones and trans-β-nitrostyrene using Hub3-cinchona (up to 96% ee) as a result of the positive effect of the C3-symmetric structure using a bulkier substrate. This equates to an increased selectivity of the catalyst in comparison to hydroquinine in the latter Michael reaction.

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Reporting the unreported: the reliability and comparability of the literature on organic solvent nanofiltration

Abstract: The way forward to improve and standardize membrane reports, and to bridge the gap between academic efforts and industrial requirements.

Cited by 66 publications

References 42 publications

Thin-Film Composite Nanofiltration Membranes for Non-Polar Solvents

Thin-Film Composite Nanofiltration Membranes for Non-Polar Solvents

Enrichment of carotene from palm oil by organic solvent nanofiltration

Synthesis of C3-Symmetric Cinchona-Based Organocatalysts and Their Applications in Asymmetric Michael and Friedel–Crafts Reactions

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