Highly effective CO2 capture using super-fine PVDF hollow fiber membranes with sub-layer large cavities

RSC Advances ◽  
2015 ◽  
Vol 5 (112) ◽  
pp. 92234-92253 ◽  
Author(s):  
Ali Ghodsi ◽  
Hossein Fashandi ◽  
Mohammad Zarrebini ◽  
Mohammad Mahdi Abolhasani ◽  
Mohsen Gorji
Keyword(s):  
Co2 Capture ◽  
Hollow Fiber ◽  
Liquid Membrane ◽  
Vinylidene Fluoride ◽  
Hollow Fiber Membranes ◽  
Highly Effective ◽  
Fiber Membranes ◽  
Poly Vinylidene Fluoride ◽  
Membrane Contactors

This work reports a noticeable advancement in CO2 capture using gas–liquid membrane contactors (GLMC) composed of super-fine poly(vinylidene fluoride) hollow fiber membranes (PVDF HFMs) incorporated with sub-layer large cavities.

scholarly journals Surface Modified Polysulfone Hollow Fiber Membranes for Ethane/Ethylene Separation Using Gas-Liquid Membrane Contactors with Ionic Liquid-Based Absorbent

Fibers ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 4 ◽  
Author(s):  
Margarita Kostyanaya ◽  
Stepan Bazhenov ◽  
Ilya Borisov ◽  
Tatiana Plisko ◽  
Vladimir Vasilevsky
Keyword(s):  
Hollow Fiber ◽  
Liquid Membrane ◽  
Membrane Contactor ◽  
Layer By Layer ◽  
Hollow Fiber Membranes ◽  
Acrylic Copolymer ◽  
Promising Alternative ◽  
Silver Salts ◽  
Fiber Membranes ◽  
Membrane Contactors

Olefin/paraffin separation is an important technological process. A promising alternative to conventional energy-consuming methods is employment of gas-liquid membrane contactors. In the present work, the membranes used were polysulfone (PSf) asymmetrical porous hollow fibers fabricated via the NIPS (non-solvent induced phase separation) technique in the free spinning mode. The surface of the fine-pored selective layer from the lumen side of the fibers was modified by layer-by-layer deposition of perfluorinated acrylic copolymer Protect Guard® in order to hydrophobized the surface and to avoid penetration of the liquid absorbent in the porous structure of the membranes. The absorbents studied were silver salts (AgNO3 and AgBF4) solutions in five ionic liquids (ILs) based on imidazolium and phosphonium cations. The membranes were analyzed through gas permeance measurement, SEM and dispersive X-ray (EDXS). Contact angle values of both unmodified and modified membranes were determined for water, ethylene glycol, ILs and silver salts solutions in ILs. It was shown that the preferable properties for employment in membrane contactor refer to the PSf hollow fiber membranes modified by two layers of Protect Guard®, and to the absorbent based on 1 M AgNO3 solution in 1-ethyl-3-methylimidazolium dicyanamide. Using the membrane contactor designed, ethylene/ethane mixture (80/20) separation was carried out. The fluxes of both components as well as their overall mass transport coefficients (MTC) were calculated. It was shown that the membrane absorption system developed provides absorption of approx. 37% of the initial ethylene volume in the mixture. The overall MTC value for ethylene was 4.7 GPU (gas permeance unit).

Microporous poly(vinylidene fluoride) hollow fiber membranes fabricated with PolarClean as water-soluble green diluent and additives

2015 ◽  
Vol 479 ◽  
pp. 204-212 ◽  
Author(s):  
Naser Tavajohi Hassankiadeh ◽  
Zhaoliang Cui ◽  
Ji Hoon Kim ◽  
Dong Won Shin ◽  
Suk Young Lee ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Vinylidene Fluoride ◽  
Water Soluble ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes ◽  
Poly Vinylidene Fluoride

Preparation and Characterization of Poly (vinylidene fluoride) Hollow Fiber Membranes via Modified Thermally Induced Phase Separation Process

2013 ◽  
Vol 734-737 ◽  
pp. 2172-2175 ◽  
Author(s):  
Ai Wen Qin ◽  
Xiang Li ◽  
Bo Mou Ma ◽  
Chun Yi Liu ◽  
Xin Zhen Zhao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Hollow Fiber ◽  
Vinylidene Fluoride ◽  
Hollow Fiber Membrane ◽  
Pure Water ◽  
Thermally Induced Phase Separation ◽  
Hollow Fiber Membranes ◽  
Thermally Induced ◽  
Fiber Membranes ◽  
Poly Vinylidene Fluoride

Poly (vinylidene fluoride) (PVDF) hollow fiber membranes were successfully prepared using DMAc/γ-BL as the mixed diluent and PEG as the additive through modified thermally induced phase separation (M-TIPS) process. The membranes prepared were characterized by scanning electron microscope. Their properties such as water permeability and mechanical properties were also determined. The results show that PVDF membranes have spherical crystallites structure with interconnected network structure because of the combination of solidliquid and liquid-liquid phase separation. When using 25wt% aqueous ethanol solution as the coagulation, the PVDF hollow fiber membrane shows the tensile strength, i.e.4.59MPa and pure water flux, i.e.415 L/ (m2·h).

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