Methane K values for

Calculate the dew-point temperature of the mixture at a pressure of 310 psia and an assumed convergence pressure of 800 psia. At various assumed temperatures and at a pressure of 310 psia, the K values for methane, nitrogen, and ethane, as obtained from Figs. 1.15,1.18, and 1.21, are fisted in Table 1.12, as are the corresponding values of A, /Ki. At the dew-point temperature, the latter will add up to 1.0. It can be seen from the table that the dew point lies between —60 and —50°F (222 and 227 K). Therefore, the condensation will take place in the last heat exchanger in the train, because that one lowers the stream temperature from —20°F (244 K) to —100°F (200 K). 

FIGURE 1.18 K values for methane convergence pressure = 800 psia. (Note 1 psi = 6.895 kPa.) (Courtesy ofNGPA.)... 

Field studies suggest that methanotrophs are methane-limited in natural habitats (I, 3). The concentrations of methane in the zones of highest consumption are always at least an order of magnitude below the measured Ks values of the natural populations, which are usually in the 2-10 ulM range. The low K,. values for methane consumption measured for natural samples suggest that the sMMO is not the predominant methane consumption system... 

Figure 9. Experimental and BACK-predicted K-values for methane +...

K-values for methane, ethane and propane are obtained from interpolation of binary chart and infinite dilution chart in GPA 1972 Handbook. K-values for the rest of components are obtained by convergence method using 800 psi convergence pressure. 

FIG. 13-17 Effect of mixture composition upon K value for n-pentane at 104 C (220 F). K values are shown for various values of VP, weight fraction propane on a methane-free basis for the methane-propane-pentane system. [Hadden, Chem. Eng. Prog. Symp. Sec. 7, 49, 5S (1953).]... 

Fig. 16.12 Pseudo-first-order rate constants, for the transformation of CFBr - 6.5pM) in suspensions of goethite (25Fe(II)j j of ImM at 25 °C ionic strength = 20mM) as a function of solution pH ( ). The contact time of Fe(II) with iron oxide before addition of CFBr3 was >24 hours. Also shown are k values for the control experiments in the absence of goethite ( ). The precipitate formed in the pH 8.9 control (arrow) was identified as a form of green rust. Reprinted with permission from Pecher K, Haderline SB, Schwarzenbach RP (2002) Reduction of polyhalogenated methanes by surface-bound Fe(ll) in aqueous suspensions of iron oxides. Environ Sci Technol 36 1734-1741. Copyright 2002 American Chemical Society...

Test your program on data for five mixtures of methane, ethane, propane, and w-butane. The k values for these species are those given in the above table, and the measured peaks are given below. For example, the area of the methane peak for the first mixture is 3.6, the area of the ethane peak for the same mixture is 2.8, and so on. 

Cell-free extracts of N. europaea will only oxidize hydroxylamine, probably because the enzyme responsible for the initial oxidation of ammonia is associated with the membrane and so is lost on disruption of the cell. This enzyme, ammonia monooxygenase, also catalyzes the oxidation of methane. While the methane has a higher K value for oxidation by ammonia monooxygenase than for oxidation by a methane monooxygenase, it is still possible that both processes would be catalyzed by ammonia monoxygenase in the natural environment. 

Figure 13 Theoretical dependence of the signal decay in PFG NMR experiments for different values of the ratio DJD, calculated from Eq. (38) by means of Eq. (39). Also, comparison with experimental data at 193 (O), 223 ([ ]), 273 ( 0), and 298 K (A) for methane in ZSM-5 and a concentration of 12 molecules per unit cell. (From Ref. 156.)...

Figure 4.8. K-value for propane in methane at cryogenic conditions.

The estimated by Eq. (10) k values for paraffins comprising only primary C-H-bonds (for example methane, neopentane) are within the limits of 0.00078/0.000013 with secondary C-H bonds (rj-paraffins)-0.48/0.00078 and with tertiary CH-bonds (sec-butane, alkylsubstituted n-paraffins) -2.93- 0.048. The found ration of reaction ability is 1/60/3692. 

Figure 5. Predicted and experimental K-values for the methane-hydrogen sulfide system at 40°F...

Computers have greatly reduced the effort and increased the calculation speed. They easily produce the necessary repetitive evaluations required to satisfy simultaneously the material and heat balances and equilibrium relationships. In computerized calculations, the selection of the equation of state influences the number of calculated theoretical stages required. Each equation of state was developed primarily from a specific data bank that usually was confined to a certain type of compound. As an example, the Benedict-Webb-Rubin equation of state was developed from experimental data on methane through n-heptane [8]. This equation is preferred to generate K values for these light hydrocarbons. The equation of state specified for the calculations should be the one based on data for compotmds most closely resembling those being separated. 

Eq. 14.5.1, and the special expression for methane, provide reasonable estimates of K values for the Cj to Cg hydrocarbons (alkanes and alkenes) in hydrocarbon mixtures - away from the critical point - in the ... 

The method provides successful prediction of K values, with somewhat poorer results in the presence of H2 and/or CH4. [Dowling and Todd (1973), for example, report an overall error of 13.6% in K values for 253 data points in methane-containing systems and of 16.7% for 206 points in hydrogen-containingsystems.] Its major drawback is that it cannot be easily adapted for computer use. 

Explain in terms of intermolecular forces the following observation At 280 K and 70 bar total pressure, the K value for hexane in the methane-hexane system is much larger than that in the hydrogen - hexane one at the same tempe-... 

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