Henry's constants of n-alkanols (methanol through n-hexanol) in water at temperatures between 40°C and 90°C

Gupta, Ankur K.; Teja, Amyn S.; Chai, Xin‐Sheng; Zhu, Junyong

doi:10.1016/s0378-3812(00)00350-2

Cited by 54 publications

(31 citation statements)

References 18 publications

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“…This value favorably compares to H = 0.0032 and 0.0058 m 3 mol −1 . 55,56 The H = 0.0019 m 3 mol −1 value is also consistent with calculations completed for 80…”

Section: Resultssupporting

confidence: 86%

Liquid Water Scavenging of PEMFC Contaminants

St‐Pierre

Wetton

Zhai

et al. 2014

J. Electrochem. Soc.

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Models were derived for the scavenging effect of product liquid water on airborne proton exchange membrane fuel cell (PEMFC) contaminants. A time scale analysis of contaminant mass transfer processes, product water accumulation in the gas diffusion electrode, and dissociation reactions indicated that the contaminant saturates the product liquid water simplifying model derivation. The baseline model only accounts for contaminant solubility. A multi-scale extension to this model was derived for the presence of contaminant dissociation reactions within the product liquid water using SO 2 as a model contaminant. The extended model demonstrates the large impact of dissociation reactions at low SO 2 concentrations. For both models, explicit expressions for the average gas phase contaminant concentration within the fuel cell were also derived and can be used as a surrogate for the effective contaminant concentration to correlate the fuel cell performance loss and facilitate the definition of tolerance limits and filtering equipment. The model was validated using a non-operating PEMFC. The water was transferred from the anode to the cathode by thermo-osmosis. Model contaminants, methanol and SO 2 , were injected with an inert carrier gas to avoid reactions. The PEMFC, a cleaner alternative power generating device, still requires durability improvements to replace the incumbent internal combustion engine in automotive applications.1,2 Degradation is partly due to contaminant ingress because the system is open to the ambient atmosphere, 3 the air filter is imperfect and lets gaseous species seep through the unit 4 and the air filter is subject to failure. 5 Contamination has also been linked to water management. 6,7 However, the scavenging effect of the product liquid water on the numerous 8 and in some cases soluble, gaseous contaminant species 9 has not been studied. 10This is especially important for predictive purposes and the accurate determination of contaminant tolerance limits for the air intake. 11-13Furthermore, two technology trends are particularly relevant to the scavenging effect of liquid water. Membranes are currently being developed for higher temperatures and drier reactant streams to optimize fuel cell systems (humidifier removal, more efficient heat removal, etc). 14,15 Anion exchange membranes have also attracted interest to reduce Pt catalyst costs with the use of cheaper noble metals or nonnoble metals. 16 In anion exchange membrane fuel cells, the water is produced on the anode rather than the cathode 16 and the transport of water by electro-osmotic drag is directed toward the anode rather than the cathode.17 Therefore, drier conditions are expected in the cathode compartment. Current technology trends thus indicate that contamination will be more severe for soluble species because the presence of liquid water in the cathode compartment will be significantly reduced.Pollutant scavenging by rain drops 18-27 and gas absorbers 28 such as spray towers, 29-32 packed columns 33,34 and cables bundle conta...

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“…This value favorably compares to H = 0.0032 and 0.0058 m 3 mol −1 . 55,56 The H = 0.0019 m 3 mol −1 value is also consistent with calculations completed for 80…”

Section: Resultssupporting

confidence: 86%

Liquid Water Scavenging of PEMFC Contaminants

St‐Pierre

Wetton

Zhai

et al. 2014

J. Electrochem. Soc.

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“…The Henry's constants of methanol and 1-butanol in water at 25 • C are 2.03 × 10 −4 and 4.89 × 10 −4 (mol/m 3 )/(mol/m 3 ) [55], respectively. Therefore, the solubility of methanol exceeds that of 1-butanol.…”

Section: Methodsmentioning

confidence: 99%

Removal of methanol and 1-butanol from binary mixtures by absorption in rotating packed beds with blade packings

Hsu

Lin

2011

Chemical Engineering Journal

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“…Q is the total air flow rate (m −3 h −1 ); V is the empty bed volume (m 3 ); is the 20 h-recycling period (h); C is the concentration of VOC in gas phase (g m −3 ) or biofilm (g dm −3 ); C B is the dry biomass concentration in liquid phase (g m −3 ); CO 2 is the carbon dioxide concentration (g m −3 ); m is the Henry coefficient (dimensionless): 2.05 × 10 −4 for methanol (Gupta et al, 2000); 0.27 for toluene (Lide, 1999). Subscripts: i indicates an inlet stream.…”

Section: Bioreactorsmentioning

confidence: 99%