Tongkat Ali Extraction using Hollow Fiber Membranes Modified by Negatively Charged-modifying Marcromolecules

2014 ◽  
Vol 70 (2) ◽  
Author(s):  
N. Bolong ◽  
S. Kumaresan ◽  
I. Saad ◽  
T. Thasan ◽  
R. Ramli
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Membrane Separation ◽  
Hollow Fiber Membranes ◽  
Feed Concentration ◽  
Plant Parts ◽  
Eurycoma Longifolia ◽  
Peptide Fraction ◽  
Phase Inversion Technique ◽  
Fiber Membranes

Eurycoma longifolia Jack is an herbal medicinal plant popularly recognized as 'Tongkat Ali.' The plant parts have been traditionally used for its antimalarial, aphrodisiac, anti-diabetic, antimicrobial and anti-pyretic activities, which have also been proved scientifically. This study attempt to isolate and concentrate the targeted 4.3 kDa peptide fraction from the Tongkat Ali water extracts which consist of many other fractions of peptides, proteins and phytochemicals by membrane separation. The hollow fiber membranes made of Polyethersulfone (PES) were fabricated in-house using phase inversion technique with synthesized Charged-Surface Modifying Macromolecules (cSMM) which anticipated by the end-capped group of cSMM namely Hydroxybenzene carboxylate (HBC). The influence of stock feed concentration and system flow rate were investigated in this work. The results obtained showed that the permeate is 10 times concentrated than the actual overall extract with linear influence on protein permeate concentration with increasing feed concentration. Whereas the flow rate of the feed stream has contribute to the flow rate and the concentration of the permeate stream an increased protein concentration by 5 % with the doubled feed flow rate.

scholarly journals Preparation and characterization of different geometrical shapes of multi-bore hollow fiber membranes and application in vacuum membrane distillation

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Elham M. El-Zanati ◽  
Eman Farg ◽  
Esraa Taha ◽  
Ayman El-Guindi ◽  
Heba Abdallah
Keyword(s):  
Mechanical Properties ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Amorphous Structure ◽  
Membrane Distillation ◽  
Operating Conditions ◽  
Hollow Fiber Membranes ◽  
Preparation Conditions ◽  
Geometrical Shapes ◽  
Fiber Membranes

Abstract Multi-bore hollow fiber membranes were prepared through phase inversion spinning process using new locally designed spinnerets of various geometrical shapes. The spun cylindrical-like, rectangular or ribbon-like, and triangular-like are prepared, dried, and characterized by scanning electronic microscope. Fibers of circular (seven, five, and four bores) shape, rectangular of five bores, and triangular of three bores were chosen to study the effect of both geometrical configuration and the number of bores on the amorphous structure and the mechanical properties of the membranes. Membrane geometry, surface amorphous, and bore arrangements are very sensitive to the operating conditions, especially the extrusion and drawing rates. Three polymeric blends of different compositions are used to prepare multi-bore hollow fiber membranes. This study revealed that the blend composition of PES 16%, PVP 2%, PEG 2%, diethylene glycol 2%, and NMP 78% gives excellent mechanical properties. Optimization of the preparation conditions also developed, where the dope flow rate, the bore flow rate, and the air gap were 1.14 cm3 s−1, 1.1 cm3 s−1, and 0 cm, respectively. Furthermore, this study proved that the circular arrangement has high mechanical strength. The prepared seven-MBHF membranes were applied in the membrane distillation process, a solution of 35 g/l NaCl was used to test the membrane performance, and the achieved flux and rejection were 28.32 L/m2 h and 98.9%, respectively. This performance demonstrated that the prepared membrane in this way is suitable to compete with conventional reverse osmosis technology that uses single track hollow fibers.

scholarly journals Sinusoidal shaped hollow fibers for enhanced mass transfer

2019 ◽  
Author(s):  
Matthias Wessling
Keyword(s):  
Flow Rate ◽  
Liquid Flow ◽  
Hollow Fiber ◽  
Liquid Flow Rate ◽  
Transport Processes ◽  
Membrane Properties ◽  
Hollow Fiber Membranes ◽  
Wide Range ◽  
Fiber Membranes ◽  
Secondary Vortices

Geometrically structured flow channels induce secondary flows and vortices enhancing mass and heat transport rates. In particular, these vortices may reduce concentration polarization and subsequent fouling in membrane transport processes. In this work we present a new method of producing hollow fiber membranes with a sinusoidal change in diameter along the fiber length. We engineered a pulsation module that imposes a sinusoidally fluctuating bore liquid flow rate. Harmonic bore flow conditions can be varied over a wide range of operational settings. The fluctuating bore liquid flow rate translates into axial membrane properties varying with respect to inner bore diameter and wall thickness.We suggest that the resulting narrowing and widening of the membrane lumen channel induces secondary vortices to the liquid feed inside the membrane lumen. In gas/liquid membrane absorption processes these secondary vortices reduce the diffusional resistance, also known as the Bellhouse effect. For the produced hydrophobic PVDF membranes, improved oxygen transport from shell-to-lumen side prove superiority over straight hollow fiber membranes in G/L absorption process by a factor of 2.5 at higher liquid flow rates. We anticipate the dynamic flow module to be easily integrated into currently existing hollow fiber membrane spinning processes.

scholarly journals Study on the effect of spinning conditions on the performance of PSf/PVP ultrafiltration hollow fiber membrane

2018 ◽  
Vol 14 (3) ◽  
pp. 343-347 ◽  
Author(s):  
Sumarni Mansur ◽  
Mohd Hafiz Dzarfan Othman ◽  
Ahmad Fauzi Ismail ◽  
Muhammad Nidzhom Zainol Abidin ◽  
Noresah Said ◽  
...  
Keyword(s):  
Pore Size ◽  
Hollow Fiber ◽  
Phase Inversion ◽  
Hollow Fiber Membrane ◽  
Hollow Fibers ◽  
Hollow Fiber Membranes ◽  
Fiber Membrane ◽  
Membrane Pore ◽  
Phase Inversion Technique ◽  
Fiber Membranes

Asymmetric, porous ultrafiltration polysulfone (PSf) hollow fiber membranes were fabricated via the dry-wet phase inversion spinning technique specifically for haemodialysis membrane. The objective was to discover the suitable spinning condition for the fabrication of ultrafiltration hollow fiber membrane with desired sponge-like structure. During haemodialysis procedure, uremic toxins such as urea and creatinine range from size 10,000-55,000 Da needs to be excreted out from the blood. While, proteins such as albumin (66,000 Da) need to be retained. The physical structure or morphology of a fabricated membrane is a major concern in determining the efficiency of a dialysis membrane. Different type of membrane morphology will give a different result in term of its permeability and clearance efficiency. The phase inversion spinning technique is suitable in producing ultrafiltation (UF) membrane where the average pore size of the fabricated membrane is in the range of 0.001 – 0.1 µm. However, there is many factors need to be controlled and manipulated in the phase inversion technique. In this study, the effect of the PVP on membrane pore size and performances were analysed. The contact angle measurement was measured to determine the hydrophilicity of the fibers. The hydrophilic polymer is favorable to avoid fouling and increase its biocompatibility. Furthermore, the diameter of the hollow fibers was determined using a scanning electron microscope (SEM). The effects of different morphology of the hollow fibers on the performance of the membranes were evaluated by pure water flux and BSA rejection. Both techniques were tested using permeation flux system. Based on the results obtained, it is found that the finger-like macrovoids in PSf hollow fiber membranes were suppressed by adding 8% PVP (Mw of 360 kDa) into the spinning dope solution as the result of a drastic increase in dope viscosity. On top of that, fiber spun with 8% PVP show more porous structure which contribute to higher permeability of the membrane. The result of this study can benefit to the membrane field of research especially in membrane technology for haemodialysis application.

Fabrication of Inner Grooved Hollow Fiber Membranes Using Microstructured Spinneret for Nerve Regeneration

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Jun Yin ◽  
Zonghuan Wang ◽  
Wenxuan Chai ◽  
Guangli Dai ◽  
Hairui Suo ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Nerve Regeneration ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Groove Width ◽  
Fine Tuning ◽  
Fluid Flow Rate ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

Nerve conduits with topographical guidance have been recognized as the efficient repair of damaged peripheral nerves. In this study, polymeric hollow fiber membranes (HFMs) with grooved inner surface have been fabricated from a microstructured spinneret using a dry-jet wet spinning process for nerve regeneration studies. The effectiveness of HFM inner grooves has been demonstrated during an in vitro study of chick forebrain neuron outgrowth. It is of great importance that the groove geometry can be controllable to meet various needs in promoting nerve regeneration performance. While the overall groove geometry is determined by the spinneret design, fabrication conditions are also indispensable in fine-tuning the final groove geometry such as the groove height and width on the order of 10 μm or less. It is found that the bore fluid flow rate can be utilized to effectively adjust the resulting groove height by at most 52% and groove width by at most 61%, respectively, without modifying the spinneret geometry. This enables a new approach to fabricate different grooved HFMs using the same spinneret. By comparing to the influences of bore fluid flow rate, the dope fluid flow rate is less effective in regulating the groove height and width when using the same microstructured spinneret. Both bore and dope fluid flow rates should be carefully selected for fine groove width tuning.

CO2 Desorption by Hydrophilic PTFE Hollow Fiber Membranes via a Membrane Flash Process

2015 ◽  
Vol 671 ◽  
pp. 293-299
Author(s):  
Peng Peng Lv ◽  
Feng Wang ◽  
Yu Hai Guo ◽  
Hong Yan Tang
Keyword(s):  
Flow Rate ◽  
Thermal Energy ◽  
Hollow Fiber ◽  
Solution Flow Rate ◽  
Hollow Fiber Membranes ◽  
Solution Flow ◽  
Desorption Process ◽  
Fiber Membranes ◽  
Rich Solution ◽  
Release Ratio

In this study, hydrophilic PTFE hollow fiber membranes were prepared and applied for CO2 desorption via a membrane flash process, which is a new CO2 desorption process by utilizing waste thermal energy. The methyldiethanolamine was selected as the absorbent. Effects of the flashing temperature, flashing pressure, rich solution flow rate and MDEA concentration on CO2 release ratio and CO2 desorption flux were deeply investigated. The results show that flashing temperature is positive to the CO2 release ratio and CO2 desorption flux. However, the flashing pressure, rich solution flow rate and MDEA concentration are negative to the CO2 release ratio and CO2 desorption flux.

Regeneration of the Absorbent by the PTFE Hollow Fiber Membranes Using Vacuum Membrane Regeneration Technology

2015 ◽  
Vol 671 ◽  
pp. 300-305 ◽  
Author(s):  
Kun Wang ◽  
Feng Wang ◽  
Yu Hai Guo ◽  
Hong Yan Tang ◽  
Hua Peng Zhang
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membranes ◽  
Membrane Structures ◽  
Pressing Method ◽  
Cold Pressing ◽  
Fiber Membranes ◽  
Rich Solution ◽  
Vacuum Regeneration ◽  
The Rich

The polytetrafluoroethylene (PTFE) hollow fiber membranes were prepared through a cold pressing method including paste extruding, stretching and sintering in this study. Membrane vacuum regeneration technology (MVR) was developed as a novel regeneration technology for regeneration of the absorbent. The membrane structures of the PTFE hollow fiber membranes were investigated. The mixture of N-methyldiethanolamine and piperazine was selected as the absorbent. The PTFE hollow fiber membranes were used for regeneration through vacuum membrane regeneration technology. The CO2 regeneration flux and regeneration ratio increased with the increase of the regeneration temperature and the CO2 loading. The regeneration pressure was negative to the regeneration flux and regeneration ratio. When the flow rate of the rich solution increased, the regeneration ratio decreased and CO2 regeneration flux increased significantly.

scholarly journals The Effects of PEI Hollow Fiber Substrate Characteristics on PDMS/PEI Hollow Fiber Membranes for CO2/N2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 56
Author(s):  
Guoqiang Li ◽  
Wojciech Kujawski ◽  
Katarzyna Knozowska ◽  
Joanna Kujawa
Keyword(s):  
Flow Rate ◽  
Composite Membrane ◽  
Hollow Fiber ◽  
Composite Membranes ◽  
Hollow Fibers ◽  
Separation Performance ◽  
Fluid Composition ◽  
Hollow Fiber Membranes ◽  
Ideal Selectivity ◽  
Fiber Membranes

The CO2 separation from flue gas based on membrane technology has drawn great attention in the last few decades. In this work, polyetherimide (PEI) hollow fibers were fabricated by using a dry-jet-wet spinning technique. Subsequently, the composite hollow fiber membranes were prepared by dip coating of polydimethylsiloxane (PDMS) selective layer on the outer surface of PEI hollow fibers. The hollow fibers spun from various spinning conditions were fully characterized. The influence of hollow fiber substrates on the CO2/N2 separation performance of PDMS/PEI composite membranes was estimated by gas permeance and ideal selectivity. The prepared composite membrane where the hollow fiber substrate was spun from 20 wt% of dope solution, 12 mL/min of bore fluid (water) flow rate exhibited the highest ideal selectivity equal to 21.3 with CO2 permeance of 59 GPU. It was found that the dope concentration, bore fluid flow rate and bore fluid composition affect the porous structure, surface morphology and dimension of hollow fibers. The bore fluid composition significantly influenced the gas permeance and ideal selectivity of the PDMS/PEI composite membrane. The prepared PDMS/PEI composite membranes possess comparable CO2/N2 separation performance to literature ones.

Dual Layer Mixed Matrix Hollow Fiber Membranes for Outside-In Filtration of Human Blood Plasma

2020 ◽  
Author(s):  
O.E.M. ter Beek ◽  
M.K. van Gelder ◽  
C. Lokhorst ◽  
D.H.M. Hazenbrink ◽  
B.H. Lentferink ◽  
...  
Keyword(s):  
Blood Plasma ◽  
Human Blood ◽  
Hollow Fiber ◽  
Human Blood Plasma ◽  
Hollow Fiber Membranes ◽  
Mixed Matrix ◽  
Fiber Membranes
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