Henry’s constant for

The use of Henry s constant for a standard-state fugacity means that the standard-state fugacity for a noncondensable component depends not only on the temperature but also on the nature of the solvent. It is this feature of the unsymmetric convention which is its greatest disadvantage. As a result of this disadvantage special care must be exercised in the use of the unsymmetric convention for multicomponent solutions, as discussed in Chapter 4. 

Normally, Henry s constant for solute 2 in solvent 1 is determined experimentally at the solvent vapor pressure Pj. The effect of pressure on Henry s constant is given by... 

To estimate Henry s constant for solute i in a mixed solvent, we use the approximation... 

Table 3 shows results obtained from a five-component, isothermal flash calculation. In this system there are two condensable components (acetone and benzene) and three noncondensable components (hydrogen, carbon monoxide, and methane). Henry s constants for each of the noncondensables were obtained from Equations (18-22) the simplifying assumption for dilute solutions [Equation (17)] was also used for each of the noncondensables. Activity coefficients for both condensable components were calculated with the UNIQUAC equation. For that calculation, all liquid-phase composition variables are on a solute-free basis the only required binary parameters are those for the acetone-benzene system. While no experimental data are available for comparison, the calculated results are probably reliable because all simplifying assumptions are reasonable the... 

G = air flow rate, mass/time L = waste flow rate, volume/time X = concentration of pollutant in waste, massA ohime H = Henry s constant for the pollutant in water, volume/mass... 

In Eq. (128), the superscript V stands for the vapor phase v2 is the partial molar volume of component 2 in the liquid phase y is the (unsym-metric) activity coefficient and Hffl is Henry s constant for solute 2 in solvent 1 at the (arbitrary) reference pressure Pr, all at the system temperature T. Simultaneous solution of Eqs. (126) and (128) gives the solubility (x2) of the gaseous component as a function of pressure P and solvent composition... 

A1-Haddad AA, Abdo MSE, Abdul-Wahab SA. 1989. Evaluation of Henry s constant for H2S in water and sewage effluents. J Environ Sci Health. Part A, Environ Sci Engin 24 207-227. 

The partial pressure of H2S on a volumetric basis in the atmosphere in equilibrium with a water phase of sulfide (H2S + HS ) is at a pH of 7, approximately equal to 100 ppm (gS m-3)-1 (Figure 4.2). It is clear that under equilibrium conditions, much lower concentrations than those corresponding to the values shown in Table 4.6 may result in odor and human health problems. This is also seen from the fact that Henry s constant for H2S is rather high, //H2S =563 atm (mole fraction)-1 at 25°C (Table 4.1). However, under real conditions in sewer networks, conditions close to equilibrium rarely exist because of, for example, ventilation and adsorption followed by oxidation on the sewer walls. Typically, the gas concentration found in the sewer atmosphere ranges from 2-20% and is normally found to be less than 10% of the theoretical equilibrium value (Melbourne and Metropolitan Board of Works, 1989). 

K being Henry s constant of hydrogen in benzene and xH2 the H2 mole fraction in the liquid phase. Now let us assume that Henry s constant for the reaction mixture has the same value as for pure benzene at the same temperature. As the amount of H2 in the solvent will be very small, [H2] is proportional to its molar fraction [316], that is,... 

Debye-Huckel parameter H = Henry s constant for molecular solute I = ionic strength = o.5 K = equilibrium constant m = molality, mole kg-1 P = pressure, Pa R = gas constant, J mol K T = temperature, K 3 ]... 

DhCI.HCI HC1,HC1 and the Henry s constant for hydrogen chloride as adjustable parameters. Figure 1 shows experimental data and correlation results. The average percentage deviation for total pressure is 0.44, and that for HC1 vapor fraction is 0.35. The same data was previously correlated with the same objective function by Cruz and Renon (7 ). Their results were 0.99 percent deviation for total pressure and 0.34 percent deviation for HC1 vapor fraction. 

The solubilities of ammonia, carbon dioxide, and hydrogen sulfide were obtained from binary data and expressed in terms of a Henry s constant for infinite dilution and an interaction parameter ... 

The Henry s constant for ammonia at temperatures from 20 to 150 C is admirably represented by the equation of EMNP(3). Haas and Fisher(13) obtained constants from 150° to 300°C from the data of Jones (14) on low concentrations of ammonia. 

Figure 1. Henry s constant for solubility of ammonia in water (O) Clifford and Hunter (A) Macriss (Q) Van Krevelen (V) Frohlich (0) Wells (9) also see...

Figure 3. Henry s constant for solubility of carbon dioxide in water (O) int l. crit. table (A) calc, from Takenouchi and Kennedy, and Malinin (Q) calc, from Wiebe and Gaddy, Houghton et al. (V) Malinin, low pressure see Ref. 8...

Table 15.2 Henry s Constant for LDPE Resin and Dissolved Ethylene [22]...

Abd-El-Baiy, M.F., Hamoda, M.F., Tanisho, S.,andWakao, N. Henry s constants for phenol over its diluted aqueous solution, J. Chem. Eng. Data, 31(2) 229-230, 1986. 

Breiter. W.A.. Baker. I.M.. and Koskinen. W.C. Direct measurement of Henry s constant for 5-ethyl TV.TV-di-n-propyl-thiocarbamate. J. Agric. Food Chem., 46(4) 1624-1629.1998. 

Table 7.1 Vapor pressure and Henry s constant for various organic compounds at 25 °C. (Stumm and Morgan 1996)...

Kirsten, 1968), as shown in figure 9.15A. With P and composition held constant, solubility increases slightly with T Figure 9.15B shows an Arrhenius plot of Henry s constant for an alkaline basalt melt in the T range 1250 < T (°C) < 1500 (Lux, 1987). From equality of potentials at equilibrium ... 

Using the tabulation of Perry and Green (1999), the following equation can be obtained for Henry s constant for air in the temperature range 5 90 °C and water as solvent ... 

Another correlation for estimating Henry s constant for oxygen dissolved in water in the temperature range 100 200 °C has been presented by Wu et al. (2003) ... 

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