Establishing the suitability of symmetric ultrathin wall polydimethylsiloxane hollow-fibre membrane contactors for enhanced CO2 separation during biogas upgrading

Heile, S.; Rosenberger, S.; Parker, Alison; Jefferson, Bruce; McAdam, Ewan J.

doi:10.1016/j.memsci.2013.10.007

Cited by 53 publications

(37 citation statements)

References 32 publications

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“…Because the increase of feed gas flow rate reduced the residence time of gas in the membrane module, the contact probability of CO 2 with water at interface decreased accordingly, thus the removal efficiency decreased. Similar trends were also reported in existing studies …”

Section: Resultssupporting

confidence: 92%

Enhancing CO₂ absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

et al. 2017

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The internal structure design of membrane module is very important for gas removal performance using membrane contactor via physical absorption. In this study, a novel membrane contactor developed by weaving polytetrafluoroethylene (PTFE) hollow fibers was applied to remove CO 2 from 60% N 2 1 40% CO 2 mixture (with CO 2 concentration similar to that of biogas) at elevated pressure (0.8 MPa) using water as absorbent. Compared with the conventional module with randomly packed straight fibers, the module with woven PTFE fibers exhibited much better CO 2 absorption performance. The weaving configuration facilitated the meandering flow or Dean vortices and renewing speed of water around hollow fibers. Meanwhile, the undesired influences such as channeling and bypassing were also eliminated. Consequently, the mass transfer of liquid phase was greatly improved and the CO 2 removal efficiency was significantly enhanced. The effects of operation pressure, module arrangement, feed gas, and water flow rate on CO 2 removal were systematically investigated as well. The overall mass-transfer coefficient (K OV ) varied from 1.96 3 10 25 to 4.39 3 10 25 m/s (the volumetric mass-transfer coefficient K L a 5 0.034-0.075 s 21 ) under the experimental conditions. The CO 2 removal performance of novel woven fiber membrane contactor matched well with the simulation results.

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Section: Resultssupporting

confidence: 92%

Enhancing CO₂ absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

et al. 2017

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“…2) to provide a broad data range and to ensure reasonable coverage of the lumen diameters ordinarily selected in the literature [17], [24]. Accuracy of the specified inner diameter (lumen diameter) for each hollow fibre was ascertained using environmental scanning electron microscopy (ESEM) and optical microscopy (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, once Gz exceeded around 2, membrane resistance (1/ k m ) dominated mass transfer. The membrane resistance (1/k m ) estimated at the intercept of the Wilson plot can be considered an estimate of the reciprocal of the permeance (or, δ/P) [17], [26]. In this study, the estimated permeance was around 2550 GPU (1 GPU=10 −6 cm 3 (STP) cm −2 s −1 cm Hg −1 ) which compares to a permeance of 575 GPU estimated from literature permeability data ([35] after [21]).…”

Section: Resultsmentioning

confidence: 99%

“…This could, in part, be compensated for by extending fibre length. For example, for the 4800 µm fibre operated at Re 14, outlet RH increased from 13.5% at 0.1 m fibre length to 31.9% (0.4 m) and 54.9% at 0.8 m. However, the non-linear increase in RH with fibre length indicates hindrance to mass transfer due to the increase in gas-side water vapour concentration which reduces the driving force for mass transfer [17]. Importantly, the governing role of both residence time and lumen diameter on controlling tube-side gas-phase saturation that has been identified in this study, are evidence that the permeability of the membrane used constrains mass transfer.…”

Section: Discussionmentioning

confidence: 98%

“…For gas-liquid applications with gas flowing on the tube-side, K ov represents contributions from the membrane ( k m ), liquid phase ( k l ) and gas phase ( k g ) [17]. However, the overall resistance to mass transfer (

1 / K_{italicov}

) is often dominated by one or more phases.…”

Section: Introductionmentioning

confidence: 99%

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Tube-side mass transfer for hollow fibre membrane contactors operated in the low Graetz range

Wang

Mercer

Kamranvand

et al. 2017

Journal of Membrane Science

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Transformation of the tube-side mass transfer coefficient derived in hollow fibre membrane contactors (HFMC) of different characteristic length scales (equivalent diameter and fibre length) has been studied when operated in the low Graetz range (Gz<10). Within the low Gz range, mass transfer is generally described by the Graetz problem (Sh=3.67) which assumes that the concentration profile comprises a constant shape over the fibre radius. In this study, it is experimentally evidenced that this assumption over predicts mass transfer within the low Graetz range. Furthermore, within the low Gz range (below 2), a proportional relationship between the experimentally determined mass transfer coefficient (Kov) and the Graetz number has been identified. For Gz numbers below 2, the experimental Sh number approached unity, which suggests that mass transfer is strongly dependent upon diffusion. However, within this diffusion controlled region of mass transfer, tube-side fluid velocity remained important. For Gz numbers above 2, Sh could be satisfactorily described by extension to the Lévêque solution, which can be ascribed to the constrained growth of the concentration boundary layer adjacent to the fibre wall. Importantly this study demonstrates that whilst mass transfer in the low Graetz range does not explicitly conform to either the Graetz problem or classical Lévêque solution, it is possible to transform the experimentally derived overall mass transfer coefficient (Kov) between characteristic length scales (dh and L). This was corroborated by comparison of the empirical relationship determined in this study (Sh=0.36Gz) with previously published studies operated in the low Gz range. This analysis provides important insight for process design when slow tube-side flows, or low Schmidt numbers (coincident with gases) constrain operation of hollow fibre membrane contactors to the low Gz range.

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Gas‐Organic and Gas‐Inorganic Interfacial Effects in Gas/Adsorbent Interactions: The Case ofCO₂/CH₄Separation

Lourenço

Gomes

Ferreira

2017

Hybrid Organic‐Inorganic Interfaces

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Establishing the suitability of symmetric ultrathin wall polydimethylsiloxane hollow-fibre membrane contactors for enhanced CO2 separation during biogas upgrading

Cited by 53 publications

References 32 publications

Enhancing CO₂ absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

Enhancing CO₂ absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

Tube-side mass transfer for hollow fibre membrane contactors operated in the low Graetz range

Gas‐Organic and Gas‐Inorganic Interfacial Effects in Gas/Adsorbent Interactions: The Case ofCO₂/CH₄Separation

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Establishing the suitability of symmetric ultrathin wall polydimethylsiloxane hollow-fibre membrane contactors for enhanced CO2 separation during biogas upgrading

Cited by 53 publications

References 32 publications

Enhancing CO2 absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

Enhancing CO2 absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

Tube-side mass transfer for hollow fibre membrane contactors operated in the low Graetz range

Gas‐Organic and Gas‐Inorganic Interfacial Effects in Gas/Adsorbent Interactions: The Case ofCO2/CH4Separation

Contact Info

Product

Resources

About

Enhancing CO₂ absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

Enhancing CO₂ absorption efficiency using a novel PTFE hollow fiber membrane contactor at elevated pressure

Gas‐Organic and Gas‐Inorganic Interfacial Effects in Gas/Adsorbent Interactions: The Case ofCO₂/CH₄Separation