Prediction of the vapor–liquid distribution constants for volatile nonelectrolytes in water up to its critical temperature

Plyasunov, Andrey V.; Shock, Everett L.

doi:10.1016/j.gca.2003.08.003

Cited by 61 publications

(51 citation statements)

References 152 publications

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“…In Table 4, the saturation concentrations for CO 2 and N 2 are shown for comparison. These values were calculated using the Henry's law constants from the Plyasunov and Shock (2003) database at a total pressure corresponding to the elevation and temperature for each spring. By comparing the measured concentrations of dissolved CO 2 and N 2 with the calculated saturation concentrations, it is noticed that dissolved CO 2 is close to saturation in most of the bubbling springs (Toquián, Agua Caliente, Orlando and La Calera).…”

Section: Dissolved Gasesmentioning

confidence: 99%

Chemical and isotopic compositions of thermal springs, fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic surveillance

et al. 2008

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This study presents baseline data for future geochemical monitoring of the active Tacaná volcanohydrothermal system (Mexico-Guatemala). Seven groups of thermal springs, related to a NW/SE-oriented fault scarp cutting the summit area (4,100m a.s.l.), discharge at the northwest foot of the volcano (1,500-2,000m a.s.l.); another one on the southern ends of Tacaná (La Calera). The near-neutral (pH from 5.8 to 6.9) thermal (T from 25.7°C to 63.0°C) HCO 3 -SO 4 waters are thought to have formed by the absorption of a H 2 S/SO 2 -CO 2 -enriched steam into a Cl-rich geothermal aquifer, afterwards mixed by Na/HCO 3 -enriched meteoric waters originating from the higher elevations of the volcano as stated by the isotopic composition (δD and δ 18 O) of meteoric and spring waters. Boiling temperature fumaroles (89°C at~3,600m a.s.l. NW of the summit), formed after the May 1986 phreatic explosion, emit isotopically light vapour (δD and δ 18 O as low as −128 and −19.9‰, respectively) resulting from steam separation from the summit aquifer. Fumarolic as well as bubbling gases at five springs are CO 2 -dominated. The δ 13 C CO2 for all gases show typical magmatic values of −3.6 ± 1.3‰ vs V-PDB. The large range in 3 He/ 4 He ratios for bubbling, dissolved and fumarolic gases [from 1.3 to 6.9 atmospheric 3 He/ 4 He ratio (R A )] is ascribed to a different degree of near-surface boiling processes inside a heterogeneous aquifer at the contact between the volcanic edifice and the crystalline basement ( 4 He source). Tacaná volcano offers a unique opportunity to give insight into shallow hydrothermal and deep magmatic processes affecting the CO 2 / 3 He ratio of gases: bubbling springs with lower gas/water ratios show higher 3 He/ 4 He ratios and consequently lower CO 2 / 3 He ratios (e.g. Zarco spring). Typical Central American CO 2 / 3 He and 3 He/ 4 He ratios are found for the fumarolic Agua Caliente and Zarco gases (3.1 ± 1.6 × 10 10 and 6.0 ± 0.9 R A , respectively). The L/S (5.9 ± 0.5) and (L + S)/M ratios (9.2 ± 0.7) for the same gases are almost identical to the ones calculated for gases in El Salvador, suggesting an enhanced slab contribution as far as the northern extreme of the Central American Volcanic Arc, Tacaná.

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Section: Dissolved Gasesmentioning

confidence: 99%

Chemical and isotopic compositions of thermal springs, fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic surveillance

et al. 2008

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“…The Henry's coefficient can be found in the literature, using the compilation of Sander or specific articles [36][37][38][39][40][41]. When the value cannot be found for a specific compound or in specific conditions, it remains possible to use some thermodynamic models which provide good accuracies [39,[42][43][44][45]. k L and K L are respectively the local and overall liquid film mass transfer coefficient (m.s -1 ) linked together by the following relation:…”

Section: Mass Transfer Ratementioning

confidence: 99%

Overview of mass transfer enhancement factor determination for acidic and basic compounds absorption in water

Biard

Couvert

2013

Chemical Engineering Journal

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Absorption or gas-liquid mass transfer is a fundamental unit operation useful in many fields, particularly gas treatment (wet scrubbing). Absorption of basic or acidic compounds, even hydrophobic, in water can be achieved successfully due to the mass transfer enhancement linked to proton transfer reactions in the liquid film. The absorption rate takes this phenomenon into account through the enhancement factor E, which depends on many parameters: nature (irreversible or reversible), kinetics and stoichiometry of the reaction, reagents and products diffusion coefficients and concentrations. This article gives an overview of the enhancement factor determination for acidic and basic compounds transfer in water. Modeling is performed for three compounds of interest, hydrogen sulfide H 2 S, methyl mercaptan CH 3 SH and ammonia NH 3 , for different scenarii to assess the influence of the pH. The results demonstrate that recombination with HO -and protonation reactions are respectively the two preponderant reactions for respectively acidic and basic compounds. They enable to reach large values of the enhancement factor at appropriated pH and to reduce the mass transfer resistance in the liquid film. Furthermore, the simulations highlight that, in many cases, knowledge of the reaction kinetics is not necessary since the reaction can be considered as instantaneous compared to mass transfer.

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“…A quite different procedure has been used by many workers, including Plyasunov and Shock [6], for volatile compounds. In this method, data on Henry's Law constants, equivalent to K w , enthalpies and heat capacities of hydration, H • w and C p w , and data on the temperature variation of C p w were all combined to obtain a fitting equation for Henry's Law constants, or the related quantity the standard Gibbs energy of hydration G • w that could be used to predict values of G • w from 273 to 647 K. The general fitting equation of Plyasunov and Shock [6] for the variation of G • w with temperature is shown as Eq.…”

Section: Introductionmentioning

confidence: 99%

“…a = C p w (298) − 298b (2) For temperatures less than about 400-450 K, the variation of C p w with temperature can be ignored [6], so setting the b-coefficient as zero, Eq. (1) then reduces to:…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of gas to water partition coefficients from 273 to 373K using predicted enthalpies and heat capacities of hydration

Abraham

Acree

2007

Fluid Phase Equilibria

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Prediction of the vapor–liquid distribution constants for volatile nonelectrolytes in water up to its critical temperature

Cited by 61 publications

References 152 publications

Chemical and isotopic compositions of thermal springs, fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic surveillance

Chemical and isotopic compositions of thermal springs, fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic surveillance

Overview of mass transfer enhancement factor determination for acidic and basic compounds absorption in water

Prediction of gas to water partition coefficients from 273 to 373K using predicted enthalpies and heat capacities of hydration

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