Hollow‐Fiber Membranes

Moch, Irving

doi:10.1002/0471238961.0815121213150308.a01

Cited by 12 publications

(10 citation statements)

References 16 publications

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“…Fina Dypro ® isotactic polypropylene pellets with a melt flow rate (MFR) of 88, a weight average molecular weight of 165,000 g/mol, and a polydispersity of 4 were melted at 200°C and spun at 200°C to produce the fibers. Both hollow and solid fibers were obtained by melt extrusion using a tube‐in‐orifice spinneret 6. Nitrogen gas was injected in the center of the molten filament to produce the hollow structure.…”

Section: Experimental Equipmentmentioning

confidence: 99%

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

Rovère

Grady

Shambaugh

2001

J of Applied Polymer Sci

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Isotactic polypropylene hollow fibers were produced by melt spinning. Spinning speeds up to 1880 m/min were used, and sample hollowness (percentage void in cross section) ranged from 0 to 69%. The fiber samples were characterized using dynamic mechanical analysis, birefringence, tensile testing, and differential scanning calorimetry. The hollow fibers were found to have higher crystallinity, orientation, and strength than the analogous solid fibers. In general, the polymer orientation in a hollow fiber was larger than the orientation in a solid fiber, even when the spinning speed for the latter was much larger. For a fixed outer diameter, increasing the hollowness improved fiber properties. However, as hollowness was further increased, fiber properties declined slightly. At a given percentage hollowness, increased spinning speed increased modulus and tenacity.

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Section: Experimental Equipmentmentioning

confidence: 99%

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

Rovère

Grady

Shambaugh

2001

J of Applied Polymer Sci

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“…Hollow fiber membranes (HFMs) are semipermeable cylindrical or capillary-shaped membranes with internal and exterior diameters of less than 0.25 mm and 1.00 mm, respectively. Hollow fiber configuration is more suitable for industrial gas separation due to their high surface to volume ratio and selectivity thus giving exceptional mass transfer properties for gas separations [ 86 , 87 , 88 ]. Hollow fiber mixed matrix membranes with a wide surface area and thin selective layers are recommended in most cases as the thickness of gas separation membranes is important [ 37 , 89 ].…”

Section: Amine-functionalized Metal-organic Framework Hollow Fiber Mi...mentioning

confidence: 99%

Development of Amine-Functionalized Metal-Organic Frameworks Hollow Fiber Mixed Matrix Membranes for CO2 and CH4 Separation: A Review

et al. 2022

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CO2 separation from raw natural gas can be achieved through the use of the promising membrane-based technology. Polymeric membranes are a known method for separating CO2 but suffer from trade-offs between its permeability and selectivity. Therefore, through the use of mixed matrix membranes (MMMs) which utilizes inorganic or hybrid fillers such as metal-organic frameworks (MOFs) in polymeric matrix, the permeability and selectivity trade-off can be overcome and possibly surpass the Robeson Upper Bounds. In this study, various types of MOFs are explored in terms of its structure and properties such as thermal and chemical stability. Next, the use of amine and non-amine functionalized MOFs in MMMs development are compared in order to investigate the effects of amine functionalization on the membrane gas separation performance for flat sheet and hollow fiber configurations as reported in the literature. Moreover, the gas transport properties and various challenges faced by hollow fiber mixed matrix membranes (HFMMMs) are discussed. In addition, the utilization of amine functionalization MOF for mitigating the challenges faced is included. Finally, the future directions of amine-functionalized MOF HFMMMs are discussed for the fields of CO2 separation.

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“…These advantages allow CHFM to attain long service time without frequent breakdown [1,2]. Moreover, the hollow ber membrane con guration consisting of shell and tube sides has high packing density with a large permeation area when it is assembled in a membrane module, offering high productivity at low energy consumption [3,4]. Today, the majority of CHFM in the market are fabricated from high-purity alumina.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of ceramic hollow fiber membrane derived from waste ash using phase inversion-based extrusion/sintering technique for water filtration

Tai

Othman

Dzahir

et al. 2020

Preprint

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Low-cost green ceramic hollow fiber membranes (CHFM) were successfully designed and fabricated from the industrial waste ash, palm oil fuel ash (POFA) via phase inversion-based extrusion/sintering techniques for water filter application. The extrusion process parameters such as suspension viscosity, air gap distance, and bore fluid flow rate were systematically explored to produce the membrane with the desired morphology. A high suspension viscosity would result in a small macro-voids structure. Moreover, a high air gap distance would induce fiber with long macro-voids structure, while a low bore fluid flow rate would lead to the formation of distorted lumen structure. The effect of sintering temperature towards CHFM was also studied in detail. An increase in sintering temperature improved the membrane bending strength, but also adversely affected the pure water flux due to lower porosity and higher tortuosity. The developed membranes achieved excellent bending strengths of > 75 MPa at relatively low sintering temperatures than the alternative ceramic counterparts, due to its high potassium oxide, K2O content, which acted as the low melting point sintering aid. The relatively low sintering temperature of POFA-derived CHFMs could reduce the energy consumption and sintering duration, which could be more economically attractive, as compared to their ceramic counterparts, thus benefiting industrial users.

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Hollow‐Fiber Membranes

Cited by 12 publications

References 16 publications

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

Development of Amine-Functionalized Metal-Organic Frameworks Hollow Fiber Mixed Matrix Membranes for CO2 and CH4 Separation: A Review

Design and fabrication of ceramic hollow fiber membrane derived from waste ash using phase inversion-based extrusion/sintering technique for water filtration

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