Will ultra-high permeance membranes lead to ultra-efficient processes? Challenges for molecular separations in liquid systems

Shi, Binchu; Marchetti, Patrizia; Peshev, D.; Zhang, Shengfu; Livingston, Andrew G.

doi:10.1016/j.memsci.2016.10.014

Cited by 60 publications

(37 citation statements)

References 101 publications

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“…While having even higher flux values will not have a substantial impact on membrane filtration performances, highly water specific membranes will improve the quality of water produced as well as remove unnecessary pretreatment processes. 67 An optimal bonding of water clusters within the channel is needed for selectivity, while less friction/interaction with the channel structure is desired to increase the water permeability. These key features must be combined in order to exploit both the selectivity of hydrophilic H-bonding channels like I-quartets 63 and the high permeability of hydrophobic carbon nanotubes.…”

Section: Discussionmentioning

confidence: 99%

Artificial water channels—deconvolution of natural Aquaporins through synthetic design

et al. 2018

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Artificial Water Channels (AWCs) have been developed during the last decade with the hope to construct artificial analogues of Aquaporin (AQP) proteins. Their osmotic water permeability are in the range of natural transporters, making them suitable candidates that can potentially transport water at lower energy and operating cost. Compared to AQPs, AWCs would have several potential advantages, such as improved stability, simple and scalable fabrication and higher functional density when confined in 2D membrane arrays. The first knowledge gap between AWCs and AQPs is in the mimicry of the complete set of functionality, in terms of obtaining systems capable of simultaneous water permeation and salt rejection, while not forfeiting the advantage of simplicity. Despite incipient developments, major problems still remain unsolved, such as their up-scaling preparation procedures from laboratory studies to square meters needed for large industrial membrane applications. However, the flow of structural information from molecular level through nanoscale dimensions, towards highly ordered ultradense macroscopic arrays of AWCs is conceptually possible. Successfully transitioning from synthetic molecules to functional channels and materials could lead to a new generation of membranes for water purification. Moving AWCs into products in the commercial arena is now the main objective of research in this newborn field.

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Section: Discussionmentioning

confidence: 99%

Artificial water channels—deconvolution of natural Aquaporins through synthetic design

et al. 2018

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“…Recently, many studies have been conducted into the development of novel membrane materials, optimization of membrane fabrication procedures, and understanding membrane transport mechanisms (Shi et al, 2017).…”

Section: Membranesmentioning

confidence: 99%

Bromelain Separation and Purification Processes From Pineapple Extract

Abreu

Figueiredo

2019

Braz. J. Chem. Eng.

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The concern about the effective use of agro-industrial residues from the food industry has increased. Bromelain is an enzyme mainly obtained from the pineapple plant (A. comosus), including its parts normally considered as waste. It is a high value-added product with a wide variety of applications such as in food, cosmetic and pharmaceutical industries. Many approaches have been used to purify this enzyme, but an efficient method to produce highly active and pure bromelain is still highly desirable. The investigated methods include ion exchange chromatography, precipitation, an aqueous two-phase system as well as affinity and filtration membranes. This paper gives an overview about the advantages and limitations of each one. Chronologic results and advances for these separation processes are also shown. The major tendency is the use of combined processes, such as hybrid or integrated ones.

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“…This nonlinear behavior was probably caused by the build-up of rejected solute (palm oil) near the membrane surface. Shi et al [17] suggested that in systems with retained solutes, concentration polarization becomes stronger as flux increases. This concentration polarization increased the osmotic pressure near the membrane surface and consequently lead to a lower effective driving pressure.…”

Section: The Effects Of Transmembrane Pressurementioning

confidence: 99%

Separation of Fatty Acids From Palm Oil Using Organic Solvent Nanofiltration

Nur¹,

Ghazali²

2018

MJAS

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Distillation of fatty acid from traditional recovery method consumes a lot of energy. Membrane process is more preferred because it reduces energy consumption. In this work, the possibility of separating free fatty acid (FFA) from palm oil using organic solvent nanofiltration was studied. Various commercial organic solvent nanofiltration membranes were tested using dead end filtration for their ability to remove free fatty acid from palm oil/acetone mixture. In all membranes, triglycerides (TAG) were preferentially retained at increasing pressure, while FFA were permeated through the membrane. All the three membranes showed selective permeation of FFA, with Solsep 030306 gave the highest selectivity of FFA over triglycerides. The best fatty acid separation performance was achieved using NF030306 membrane with acetone at pressure in the range of 30 to 40 bar and 3.6 g/L concentration of fatty acid. Using NF030306 membrane, 55% of low fatty acid and 87% of triglycerides were rejected from the system. Good separation was achieved at high pressure and concentration. We successfully demonstrated the separation of fatty acid separation from palm oil using organic solvent nanofiltration could be achieved.Keywords: free fatty acid, palm oil, organic solvent nanofiltration, deacidification Abstrak Pemulihan tradisional asid lemak daripada minyak yang boleh dimakan menggunakan sejumlah besar tenaga. Jika penyulingan digantikan dengan proses membran, penggunaan tenaga boleh dikurangkan dengan banyak. Dalam kajian ini, kami akan mengkaji kemungkinan untuk memisahkan asid lemak bebas daripada minyak kelapa sawit dengan menggunakan penuras nano pelarut organik. Pelbagai pelarut organik membran penuras nano komersial telah diuji menggunakan penuras nano untuk keupayaan mereka untuk memisahkan asid lemak bebas daripada campuran kelapa sawit/aseton. Untuk semua membran, trigliserida adalah dikekalkan pada tekanan yang semakin meningkat, manakala asid lemak meresap melalui membran. Ketigatiga membran menunjukkan penyerapan terpilih asid lemak, bagaimanapun Solsep 030306 memberikan pemilihan tertinggi asid lemak/trigliserida. Pemisahan asid lemak yang terbaik dicapai dengan menggunakan membran NF030306 dengan aseton pada tekanan dalam lingkungan 30 hingga 40 bar dan 3.6 g/L kepekatan asid lemak. Penolakan asid lemak yang rendah iaitu 55% dan penolakan trigliserida yang tinggi sehingga 87% telah dicapai menggunakan membran NF030306. Pemisahan baik dicapai pada tekanan tinggi dan kepekatan tinggi. Ia menunjukkan pemisahan asid lemak daripada minyak kelapa sawit menggunakan penuras nano pelarut organik boleh dicapai.Kata kunci: asid lemak bebas, minyak sawit, penuras nano pelarut organik, penyahasidan

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Will ultra-high permeance membranes lead to ultra-efficient processes? Challenges for molecular separations in liquid systems

Cited by 60 publications

References 101 publications

Artificial water channels—deconvolution of natural Aquaporins through synthetic design

Artificial water channels—deconvolution of natural Aquaporins through synthetic design

Bromelain Separation and Purification Processes From Pineapple Extract

Separation of Fatty Acids From Palm Oil Using Organic Solvent Nanofiltration

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