Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases Process
The gas separation process by asymmetric polymeric membranes has received much attention during the last decades because of its more energy efficiency than other conventional separation processes. Hollow fibers are the most favored membrane geometry owing to their high surface area per unit volume o...
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| Format: | Article |
| Language: | English |
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De Gruyter
2018-12-01
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| Series: | Applied Rheology |
| Subjects: | |
| Online Access: | https://doi.org/10.3933/applrheol-28-65935 |
| _version_ | 1819290874324975616 |
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| author | Ullsperger Jan Válek Robert |
| author_facet | Ullsperger Jan Válek Robert |
| author_sort | Ullsperger Jan |
| collection | DOAJ |
| description | The gas separation process by asymmetric polymeric membranes has received much attention during the last decades because of its more energy efficiency than other conventional separation processes. Hollow fibers are the most favored membrane geometry owing to their high surface area per unit volume of membrane module. One of the key elements determining the potential and applications of asymmetric hollow-fiber membranes are the structural properties mainly including pore size, pore distribution, selective layer thickness, molecular orientation and defectiveness. These elements can generally vary depending on conditions during dry-jet wet-spinning process. Flow conditions in spinneret during extrusion are known to affect the dense-layer of hollow fibers and possibly to enhance separation performance of hollow fibers. The aim of this study was to determine flow conditions of polyetherimide/N-Methyl-2-pyrrolidone solvent/ethanol non-solvent spinning solutions flowing through concentric annulus of spinneret during hollow fiber spinning process. The rotational rheometer was used to characterize rheological properties of spinning solutions. Newtonian behavior of the spinning solutions with arbitrary composition was shown. The effect of spinning solution and spinneret dimension on flow profile in spinneret was investigated. The Newtonian character of the spinning solutions caused constant velocity profile resp. shear rate profile regardless of dope composition when flowing through a spinneret with some flowrate. It has been shown the spinneret dimensions and geometry play a crucial role in controlling the shear flow in spinneret. The phase behavior of the PEI/NMP/EtOH dope system at a temperature of the hollow fiber spinning process (40 °C) was studied. |
| first_indexed | 2024-12-24T03:29:40Z |
| format | Article |
| id | doaj.art-b5ab5bd3728a4415900a12273eb5423e |
| institution | Directory Open Access Journal |
| issn | 1617-8106 |
| language | English |
| last_indexed | 2024-12-24T03:29:40Z |
| publishDate | 2018-12-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Applied Rheology |
| spelling | doaj.art-b5ab5bd3728a4415900a12273eb5423e2022-12-21T17:17:15ZengDe GruyterApplied Rheology1617-81062018-12-0128610.3933/applrheol-28-65935Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases ProcessUllsperger Jan0Válek Robert1Department of Inorganic Technology, University of Chemistry and Technology Prague, Technická 5, 166 28Prague 6, Czech RepublicMemBrain s.r.o, Pod Vinicí 87, 471 27Stráž pod Ralskem, Czech RepublicThe gas separation process by asymmetric polymeric membranes has received much attention during the last decades because of its more energy efficiency than other conventional separation processes. Hollow fibers are the most favored membrane geometry owing to their high surface area per unit volume of membrane module. One of the key elements determining the potential and applications of asymmetric hollow-fiber membranes are the structural properties mainly including pore size, pore distribution, selective layer thickness, molecular orientation and defectiveness. These elements can generally vary depending on conditions during dry-jet wet-spinning process. Flow conditions in spinneret during extrusion are known to affect the dense-layer of hollow fibers and possibly to enhance separation performance of hollow fibers. The aim of this study was to determine flow conditions of polyetherimide/N-Methyl-2-pyrrolidone solvent/ethanol non-solvent spinning solutions flowing through concentric annulus of spinneret during hollow fiber spinning process. The rotational rheometer was used to characterize rheological properties of spinning solutions. Newtonian behavior of the spinning solutions with arbitrary composition was shown. The effect of spinning solution and spinneret dimension on flow profile in spinneret was investigated. The Newtonian character of the spinning solutions caused constant velocity profile resp. shear rate profile regardless of dope composition when flowing through a spinneret with some flowrate. It has been shown the spinneret dimensions and geometry play a crucial role in controlling the shear flow in spinneret. The phase behavior of the PEI/NMP/EtOH dope system at a temperature of the hollow fiber spinning process (40 °C) was studied.https://doi.org/10.3933/applrheol-28-65935hollow fiber spinningflow profilespinneretphase separationbinodal curvecloud point |
| spellingShingle | Ullsperger Jan Válek Robert Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases Process Applied Rheology hollow fiber spinning flow profile spinneret phase separation binodal curve cloud point |
| title | Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases Process |
| title_full | Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases Process |
| title_fullStr | Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases Process |
| title_full_unstemmed | Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases Process |
| title_short | Properties of Polymer Solutions Intended for Formation of Hollow Fibers Membranes by Inversion Phases Process |
| title_sort | properties of polymer solutions intended for formation of hollow fibers membranes by inversion phases process |
| topic | hollow fiber spinning flow profile spinneret phase separation binodal curve cloud point |
| url | https://doi.org/10.3933/applrheol-28-65935 |
| work_keys_str_mv | AT ullspergerjan propertiesofpolymersolutionsintendedforformationofhollowfibersmembranesbyinversionphasesprocess AT valekrobert propertiesofpolymersolutionsintendedforformationofhollowfibersmembranesbyinversionphasesprocess |