Polypropylene hollow fiber membranes were prepared by the melt spinning and cold stretching process with the same composition as those for dsc and thermooptical microscope tests. Use an igcc process based on a geoxygenblown gasifier and selexolbased co. Addition of nucleating agent accelerated the crystallization rate and elevated the crystallization temperature. The hollow fiber membrane were spun using the wet spinning method to decouple the effect of shear and elongation stress due to. Design, preparation and characterization of hollow fiber membranes. The effects of pei hollow fiber substrate characteristics on pdms. The best known synthetic membrane are used in separation processes such as water purification, reverse osmosis, dehydrogenation of natural gas, removal of cell. The main distinctive feature of the method is that the deformation of both the extruded polymer solution and the nascent hollow. Hollow fiber cartridges for process scale ultrafiltration, with a polysulfone membrane available in a range of pore sizes. This can be seen as a big advantage of the use of pmp in melt.
Wide selection, standard connection process scale hollow fiber cartridges offered by cytiva are provided in 8 basic configurations covering a membrane area range of 0. Process for continuous spinning of hollowfiber membranes. Nowadays hollow fibre membranes are used in a wide range of applications. The formation of polysulfone hollow fiber membranes by the. One of the important applications of fiber membrane structures is in the field of dialysis. Mitigating the hydraulic compression of nanofiltration. We employ a high quality research and development team to design high precision membrane spinnerets with both single and multiple holes with the highest level of quality. From flat membranes to fabrication of hollow spun fibers of. Hollow fiber permeable membrane technology for obiggs, a. May 15, 2018 composite hollow fiber membranes form in a single step dryjet wet spinning process.
May 01, 2016 for the first time in this paper, porous hydrophobic pvdf asymmetric hollow fiber membranes with a high outer surface porosity for use in vacuum membrane distillation vmd were successfully fabricated by applying a simultaneous coextrusion spinning process through the nonsolvent induced phase separation nips method. A dense hollow fiber cellulosic membrane which possesses outstanding permeability and strength characteristics and the method of preparation thereof is disclosed. Operation parameters of melt spinning of polypropylene. The membranes consisting of polyethersulfone as membrane polymer.
From flat membranes to fabrication of hollow spun fibers. Hollow fiber membranes hfms are a class of artificial membranes containing a semipermeable barrier in the form of a hollow fiber. Operation parameters of melt spinning of polypropylene hollow. The polymer solution dope was prepared by addition of. Pdf hollow fiber membranes ebook download and read. The correlated effects of the air gap length and pvp concentration 1 the air gap length effect at the low and high pvp concentration in the dope solutions, as well as 2 the effect of the pvp concentration at the same air gap. Introduction hollow fiber membranes hfms are a class of artificial membranes containing a semipermeable barrier in the form of a hollow fiber. Nucleating agent increased the number of nuclei and spherulites, which offered more interspherulitic amorphous sites for stretching. Melt spinning and characterization of hollow fibers from. As part of the membrane manufacturing process, theres a risk of deteriorating the quality of membrane. A new spinning technique for hollow fiber ultrafiltration membranes i. Us5871680a method and apparatus for spinning hollow fiber. Us4219517a process for spinning dense hollow fiber. After the spinning process fibers are cut to a specific size according to the housing or shell length.
The book amply discusses the fundamental theories and practical applications of hollow fiber membranes, covering membrane formation mechanisms, hollow fiber spinning techniques, and spinneret design and module fabrication. Manufacturing of hollow fiber membrane international journal of. Hollowfiber membranes encyclopedia of desalination and water. Crosslinked composite hollow fiber membranes are backwashable. Composite hollow fiber membranes form in a single step dryjet wet spinning process. Technology study of polypropylene hollow fiber membraneslike. A polyvinylidene fluoride pvdf hollow fiber membrane was fabricated through waterinduced dope crystallization by allowing a facile spinning process delay spd in the nonsolventinduced phase separation nips process for direct contact membrane distillation dcmd. Chungeffect of dope flow rate on the morphology separation.
This invention pertains to a process for producing highly asymmetric hollow fiber membranes for gas separations by extruding the spinning dope into a zone that is maintained at reduced pressure as compared to the exterior of the spinning chamber and then conveying the extruded hollow fiber through a coagulation bath. In general, the hollow fiber spinning presents several peculiar parameters. Mitigating the hydraulic compression of nanofiltration hollow. Jul 14, 2016 the basic principles of the spinning of polysulfone hollow fiber membranes by the dryjet wet spinning process, where the polymer solution is extruded through an air gap between the spinneret and coagulation bath by the free fall spinning method, have been discussed. A drywet process for forming interiorally asymmetric hollow fiber cellulose acetate membranes is disclosed. The pipelike module design is simple, easily scalable, relatively. Hollow fiber preparation and characterization hollow fiber membranes were prepared via the drywet spinning technique through the phase inversion process. This invention relates to a process for producing hollow fiber membranes that are useful. Module designs and flow configuration tradeoff analyses. Fabrication of defectfree cellulose acetate hollow fibers by. Hollow fiber membranes union carbide industrial gases. Most commercial hollow fiber membranes are packed into.
In the present research, we have developed novel cylindrical cross flow module containing the highflux composite hydrophobic hollow fiber membranes at two levels of membrane surface areas. Technology study of polypropylene hollow fiber membranes. Filtration and degassing steps are extremely important for hollow fiber spinning because nonsoluble particles or gas bubbles present in the spinning dope solution leads to fiber breakage. Fabrication of hollow fiber membrane with a very thin dense layer fiber bundles for fiber spinning optimization. Originally developed in the 1960s for reverse osmosis applications, hollow fiber membranes have since become prevalent in water treatment, desalination, cell culture, medicine, and tissue engineering. Single and dual layer hollow fiber membrane fabrication procedure. In preparing hollow fiber membranes of this invention, a liquidliquid or wet spinning process is used. Us4035459a us05573,732 us57373275a us4035459a us 4035459 a us4035459 a us 4035459a us 57373275 a us57373275 a us 57373275a us 4035459 a us4035459 a us 4035459a authority us united states prior art keywords solvent membrane polymer hollow fiber fiber prior art date 19750501 legal status the legal status is an assumption and is not a legal conclusion. Labscale hollow fiber spinning system philos system. It has been recognized that molecular orientation will affect membrane selectivity. Modeling of spinning process for efficient production of hollow. Chungeffect of dope flow rate on the morphology separatio. Performance improvement of pvdf hollow fiberbased membrane. Fabrication of defectfree cellulose acetate hollow fibers.
The winding wheel is detachable, thus it supports continuous winding process such as ro membrane or gs membrane it enables to coat or design in the next stage of the testing process. The outer layer of the i2ps hollow fiber is found to serve as a buffering layer that mitigates hydraulic compression on the compaction of denseselective layer and sublayer and helps to retain membrane performance during nanofiltration operations. In the hollow fiber membrane system, the fibers are commonly characterized with inner radius, fiber length, and membrane resistance. Many operation parameters of melt spinning process were examined in terms of the structure variation by scanning electron microscopy. Another advantage of hollow fibers is that they are.
Melt spinning and characterization of hollow fibers from poly. Us4035459a process for spinning dryfiber cellulose. Flat sheet and hollow fiber are the most common membrane geometries. A process for producing highly asymmetric hollow fibers useful as permselective gas separation membranes and for producing composite membranes thereof by extruding the spinning dope through a tubeinorifice spinneret into a gasfilled chamber maintained at reduced pressure and then conveying the extruded hollow fiber through a liquid bath to solidify the extrudate.
Polyvinylidene fluoridepolyvinylpyrrolidone pvdfpvp hollow fiber membranes were fabricated by dryjet wet spinning process. Air liquide medal manufactures an air separation membrane such as this and their membranes are a multilayer laminate hollow fiber that is manufactured with an efficient singlestep coextrusion solution spinning process developed by dupont. Separation layer is positively charged and shows nanofiltration characteristics. It is nearly impossible to trace the temperature of hollow fiber after spinning, and we could not apply the same cooling condition to thermal and optical analyses as that of real fiber spinning. A new spinning technique for hollow fiber ultrafiltration. Hollowfiber membranes were invented about 30 years ago. Fabrication and applications focuses on the fabrication and applications of hollow fiber membranes. Moreover, the process parameters, such as the applied voltage, the flow rate of the. Hollow fiber spinning process and support material at georgia tech 58. Theoretical studies of hollow fiber spinning semantic scholar. The correlated effects of the air gap length and pvp concentration 1 the air gap length effect at the low and high pvp concentration in the dope solutions, as well as 2 the effect of the pvp concentration at the.
Macrovoidinhibited pvdf hollow fiber membranes via spinning. Request pdf the formation of polysulfone hollow fiber membranes by the free fall spinning method the basic principles of the spinning. The primary advantage of hollow fibres over other configurations is the large surface area over volume ratio. The latter has more advantages than flatsheet membranes, because they have a higher permeation areamodule volume ratio. Novel cylindrical crossflow hollow fiber membrane module. The desired morphology of the fiber wall frequently dictates the spinning meth. The cordisdow corporation has produced a hollow fiber cellulosic membrane by a gel spinning process from a solution which contains cellulose acetate, carbowaxes, i. Membrane is a thin film which separates two fluids. Theoretical studies of hollow fiber spinning semantic.
Microporous hollow fiber membranes were prepared via melt spinning of a polypropylenesoybean oil mixture. Different extrusion rates at two different rheology properties were introduced on a straight spinneret resulting in various shear rates. Effects of nucleating agents on preparation of polypropylene. The influence of shear stress induced by spinneret geometry on morphology of kaolinpesf hollow fiber membranes has been studied. Polypropylene pp hollow fiber membranes made by the melt spinning and coldstretching methods mscs in this study. The ceramic hollow fiber membranes with high permeate flux were fabricated by a controlled wet spinning process using polyethersulfone pesf and ceramic powder as precursors and 1methyl2pyrrolidinone as solvent, and the subsequent tio2 coating was performed by a dipcoating process using tetranbutyl titanate as precursor. Development of pre combustion co capture process using high. Bench scale thin film composite hollow fiber membranes for post. The operating parameter is the transmembrane pressure at the openend of the fiber. A spinneret is a device used to extrude a polymer solution or polymer melt to form fibers. A controlled wetspinning and dipcoating process for. Through the research on the membrane manufacture process and technology optimization to prepare suitable membrane for artificially lung. Chemistry in a spinneret composite hollow fiber membranes.
Highly porous pvdf hollow fiber membranes for vmd application. Development of polysulfone hollow fiber porous supports. The spinning setup, depicted in figure 2, was previously described choi et al. Effect of nonsolvents on properties of spinning solutions and polyethersulfone hollow fiber ultrafiltration membranes. Process for spinning dense hollow fiber cellulosic membrane. The overall permeate production rate is a more important concern for hollow fiber membrane system. Development of pre combustion co capture process using. Gas separation properties of hollowfiber membranes of. Us4219517a us05950,664 us95066478a us4219517a us 4219517 a us4219517 a us 4219517a us 95066478 a us95066478 a us 95066478a us 4219517 a us4219517 a us 4219517a authority us united states prior art keywords hollow fiber spinning cellulose membrane solvent prior art date 19781012 legal status the legal status is an assumption and is not a legal conclusion.
In the melt spinning process in combination with postdrawing, the degree of crystallinity can go up to 90%. Typical flow rates for dope delivered to the spinneret in practicing this. Box 217, 7500 ae enschede the netherlands received september 7,1992. Macrovoidinhibited pvdf hollow fiber membranes via.
Hollow fiber membrane, hydrophobic membrane hfms, 1. The detailed methodology can be found elsewhere 34. Membrane separation technology is an effective technology for wastewater or water. Fabrication of porous hollow fiber membranes porous hollow fiber membranes were prepared via a drywet phase inversion technique in the. Crosslinking reaction superimposes the conventional phase inversion process. Considering membrane water performance, experimental data from this study suggest that peg promotes more convenient membrane structures for ultraltration purposes than pvp and water under the conditions tested. Pdf modeling of spinning process for efficient production. The influence of morphology and the preparation process were optimized to prep are a dense hollow fiber membrane.
The taguchi method, a powerful tool for design optimization 69 has been. The fabricated hollow fiber membrane has a narrow pore size distribution with a molecular weight cutoff mwco of 470 da. A hollow fiber membrane spinneret, with polymer outlet outlined in red. Preparation and characterization of different geometrical. Hollow fiber membrane spinneret spinneret manufacturer. Introduction membrane processes and particularly hollow fiber membranes hf treatment technology for water recycling encompasses a vast number of options. Pdf effect of nonsolvents on properties of spinning. Development of polysulfone hollow fiber porous supports for. The membranes consisting of polyethersulfone as membrane polymer and polyn. Since the spinning of hollow fiber membranes involved many factors, including both the phase inversion and the rheological factors, a systematic approach was taken to study some of these main factors. Gener all y, the pol ymer is e xtr uded into ambient air tha t both cools the hollow fiber and exerts drag force on the hollow fiber s. Fantastic hollow fiber membrane spinning system enables researchers to get reliable data and reproducibility conveniently. A schematic diagram for the spinning process is shown in figure1. Pdmspei hollow fiber membranes for co2n2 separation.
The formation of polysulfone hollow fiber membranes by the free. Us4035459a process for spinning dryfiber cellulose acetate. Determine how the hightemperature hollow fiber pbi membrane process concept would work if incorporated into a nominal 550 mwe gasificationbased power plant with ccs. A highly charged polyimide p84 hollow fiber membrane can be obtained by dissolving as. The hf membrane spinning system makes it very convenient and efficient for running numerous testing as it applies the disposable raw material bag. The dope solution consisted of ca, nmp, and the additive pvp used to increase the porosity of the carbon membrane. Process scale ultrafiltration hollow fiber tangential flow. Mar 16, 20 microporous polypropylene hollow fiber membrane was fabricated from isotactic polypropylenesoybean oil system by melt spinning process.
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