Oxygen Henry coefficient

Based on equations (3.25) and (3.26) for the linear area of adsorption of dissolved oxygen on a thin semiconductor film (F being the Henry coefficient), we can derive the following equation ... 

K is the overall mass-transfer coefficient based on the liquid phase. A is the total interfacial area in the gas-liquid dispersion. C is the concentration in the liquid phase. C thus corresponds to equilibrium with the gas phase of composition y. H is the Henry coefficient for the gas. In the case of oxygen or a sparingly soluble compound, H is large and resistance to mass transfer is located in the liquid phase. 

The solubility and thermodynamic properties of various gases in [BMIM][PFg] has been determined using a gravimetric microbalance [4]. Essentially, the solubility of CO2 (particularly relevant as a carbon source) was very high, with reasonable solubilities observed for ethylene, ethane, and methane and low solubilities for oxygen, carbon monoxide, and hydrogen (H2 could not be detected). Subsequently, Henry coefficient solubility constants ofhydrogen in [BMIM][BF4] and [BMIM][PFg]... 

A, area for heat transfer Cq, dissolved oxygen concentration impeller diameter Dj, tank diameter H, Henry constant k a, volumetric oxygen transfer coefficient /tq, oxygen saturation... 

Under equiUbrium or near-equiUbrium conditions, the distribution of volatile species between gas and water phases can be described in terms of Henry s law. The rate of transfer of a compound across the water-gas phase boundary can be characterized by a mass-transfer coefficient and the activity gradient at the air—water interface. In addition, these substance-specific coefficients depend on the turbulence, interfacial area, and other conditions of the aquatic systems. They may be related to the exchange constant of oxygen as a reference substance for a system-independent parameter reaeration coefficients are often known for individual rivers and lakes. 

Mass transfer coefficients In the mass transfer calculations, we need the Henry constant of oxygen in water at 30 °C, which can be evaluated using the relevant correlations presented in Section 1.3.2, Appendix I, and is equal to 34.03. The next parameter we need is the diffusion coefficient of oxygen in water at 30 °C, which can be also found in Table 1.10, Appendix I. The correction for the temperature has been also presented in eq. (1.28) Appendix I. The evaluated diffusion coefficient is 2.5 X 10-9 m2/s. 

Figure 2. The Henry constant of oxygen in aqueous solutions of sodium sulfate at 25 °C (O) experimental data (a) the Henry constant calculated with eq 24 using for the mean activity coefficient of dissolved salt the Debye-Hiickel equation (b) the Henry constant calculated with eq 24 using for the mean activity coefficient of dissolved salt the extended Debye-Hiickel equation (c) the Henry constant calculated with eq 24 using for the mean activity coefficient of dissolved salt the Bromley equation (d) the Henry constant calculated with eq 15.

Henry s law (i.e., c = po/H) relates the equilibrium oxygen solubility in the liquid (c ) to oxygen partial pressure in the gas (po) by the corresponding Henry s law constant (H). Because the liquid film mass transfer coefficient, l, is difficult to measure independently, kj a (i.e., times a) is used. It is a lumped parameter known as the volumetric mass transfer coefficient to characterize the overall mass transfer rate. 

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