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• W80730109 abstract "Gas absorption in hollow fibre contactors is being increasingly used due totheir enormous surface area/volume ratio. The capability of the hollow fibremembrane modules for the removal of CO 2 and SO2 from a binary gasmixture has been investigated experimentally. Four different modules wereused in this study. The membranes in modules one and two were made ofmicroporous polypropylene. The third module was made of non-poroussilicone rubber (polydimethylsiloxane) while the latter one was apolyvinylidenefluoride (PVDF) asymmetric hollow fibre membrane.The gas mixtures used in the experiments were composed of 9.5% CO2 and1% SO2 in N 2 , which was introduced into the hollow fibre lumen, while theabsorbent liquid was fed into the shell side of module. The absorbent liquidsused were water, aqueous solutions of diethanolamine (DBA) and ammoniaat different concentrations (5, 10 and 20 wt%). The effects of differentoperating conditions on the permeation process have been investigated forco-current and counter-current flow patterns. In addition, to improve thesilicone rubber hollow fibre membrane performance, baffles were installedwithin the shell of the permeator to increase liquid fibre contact.The results obtained showed that the use of baffles within the shell of thepermeator improved the separation performance of the non-porousmembrane module without any substantial increase in the physical size ofthe contacting device. Studies also showed that improved performance wasobserved when the system was operated under a counter-current flowpattern. The results showed that the use of an absorbent liquid in the permeate sideof the fibres increased the selectivity of the membranes used, and reducedthe need to maintain a high pressure ratio across the membrane. Adecrease in the feed gas flow rate or increase in liquid flow rate generallyimproved the removal of gases.The results showed that the use of aqueous reactive solutions as anabsorbing medium in the permeate side of the hollow fibre permeator cansignificantly improve CO2 removal from the gas mixture. However, the mainproblem when using a microporous membrane coupled with aqueoussolutions of diethanolamine as absorbent was wetting of the microporousmembrane by amine solutions. For 862 separation, the highest removal wasattained using the microporous membrane coupled with water as absorbentliquid. This demonstrates that a hollow fibre based device can be a veryefficient gas liquid contactor.The separation process was simulated with a numerical model based on theeffective permeabilities of gases and compared with the experimentalresults. The model simulations showed good agreement with theexperimental observations." @default.
• W80730109 created "2016-06-24" @default.
• W80730109 creator A5004079191 @default.
• W80730109 date "2002-01-01" @default.
• W80730109 modified "2023-09-23" @default.
• W80730109 title "Separation of acidic gases using hollow fibre membrane contractors" @default.
• W80730109 hasPublicationYear "2002" @default.
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