Ismail, Ahmad Fauzi and Mansourizadeh, A. (2011) Preparation and characterization of porous PVDF hollow fiber membranes for CO2 absorption: effect of different non-solvent additives in the polymer dope. International Journal of Greenhouse Gas Control, 5 (4). pp. 640-648. ISSN 1750-5836
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Official URL: http://dx.doi.org/10.1016/j.ijggc.2011.03.009
Abstract
Different types of non-solvent additives were introduced into the polyvinylidene fluoride (PVDF) dope to investigate improvement of the hollow fiber membrane structure for CO2 absorption. Phase-inversion behavior of the PVDF dopes was studied using cloud points measurements. Glycerol, phosphoric acid, ethanol and polyethylene glycol (PEG-400) were used as non-solvent additives in the polymer dope. With addition of the additives, precipitation of the polymer dopes increased following the trend of phosphoric acid > glycerol > ethanol > PEG-400. From morphology examination, PEG-400, glycerol and phosphoric acid resulted in the membranes with almost sponge-like structure due to high viscosity of the spinning dopes. The low wetting resistance and high permeability of the plain PVDF and PVDF/ethanol membranes were attributed to the large finger-likes structure. Among the additives, glycerol provided the membranes with larger mean pore size (9.62 nm). CO2 absorption by distilled water was conducted through the gas–liquid membrane contactors. The PVDF/glycerol membrane demonstrated higher CO2 absorption flux than the other membranes. At the absorbent flow rate of 280 ml/min, CO2 flux of 7.8 × 10-4 mol/m2 s was achieved, which was approximately 30% higher than CO2 flux of the plain PVDF membrane. In conclusion, a developed membrane structure prepared by controlled phase-inversion process can be a promising alternative for CO2 capture in gas–liquid membrane contactors.
Item Type: | Article |
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Uncontrolled Keywords: | membrane contactor, non-solvent additive, PVDF hollow fiber membrane |
Subjects: | Q Science > Q Science (General) T Technology > TP Chemical technology |
Divisions: | Chemical and Natural Resources Engineering |
ID Code: | 29375 |
Deposited By: | Yanti Mohd Shah |
Deposited On: | 13 Mar 2013 02:19 |
Last Modified: | 31 Jan 2022 08:41 |
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