Nitrogen Methane

Natural-gas components include water vapor, carbon dioxide (qv), sometimes hydrogen sulfide, heavier hydrocarbons (qv), methane, nitrogen, small amounts of argon, traces of neon and hydrogen, and helium. The production of pure helium from natural gas requires three basic processing steps (73). 

E. A. Davidson, in Production and Consumption of Greenhouse Gases Methane, Nitrogen Oxides, and Halomethanes, ed. J. E. Rogers and W. B. Whitman, American Society for Microbiology, Washington, 1991, p. 219. 

The rich gas from the absorption operation is usually stripped of the desirable components and recycled back to the absorber (Figure 8-57). The stripping medium may be steam or a dry or inert gas (methane, nitrogen, carbon oxides—hydrogen, etc.). This depends upon the process application of the various components. 

Land/atmospheric interfacial processes which impact climate and biological activity on earth are illustrated in Figure 3. Emissions of carbon dioxide, methane, nitrogen dioxide, and chlorofluorocarbons (CFCs) have been linked to the transmission of solar radiation to the surface of the earth as well as to the transmission of terrestrial radiation to space. Should solar radiation be an internal process or an external driver of the hydrologic cycle, weather, and air surface temperatures Compounds of sulfur and nitrogen are associated with acidic precipitation and damage to vegetation, aquatic life, and physical structures. 

The permeation properties of substituted PPO to a carbon dioxide, methane, nitrogen mixture were studied for several systems. The results are presented in Table VI. 

B. Fausett, M. C. Granger, M.L. Hupert, J. Wang, G. M. Swain, D. M. Gruen, The electrochemical properties of nanocrystalline diamond thin-films deposited from C60/Argon and Methane/Nitrogen gas mixtures, Electroanal., vol. 12, pp. 7-15, 2000. 

Hydrogen Carbon monoxide dioxide Methane. Nitrogen... 

This paper presents isotherms for the adsorption of methane, nitrogen, carbon dioxide, and water vapor on a Pocahontas No. 3 (lvb) and a Pittsburgh (hvab) coal. Rate data for the adsorption of methane on these coals will be described in a subsequent paper. 

McKoy and Sinanoglu (1963) and Child (1964) refined the van der Waals and Platteeuw method using different intermolecular potentials such as the Kihara potential. Workers at Rice University, such as Marshall et al. (1964) and Nagata and Kobayashi (1966a,b), first fit simple hydrate parameters to experimental data for methane, nitrogen, and argon. Parrish and Prausnitz (1972) showed in detail how this method could be extended to all natural gases and mixed hydrates. 

Therefore, key advantages of the QCM method are that much smaller samples (one drop of water) and hence shorter times (15 min/temperature step versus several hours for conventional methods) are required for these hydrate phase equilibria measurements. The authors applied this system to measure dissociation temperatures of gas hydrates, such as methane, nitrogen, and oxygen hydrates. 

The phase equilibria data for binary guest mixtures are listed under the lighter component. For example, under the heading of binary guest mixtures of methane will be found data for methane + ethane, methane + propane, methane + isobutane, methane + n-butane, methane + nitrogen, methane + carbon dioxide, and methane + hydrogen sulfide. Concentrations are in mole percent or mole fraction in the gas phase, unless otherwise indicated. 

Hydrate Methane + nitrogen Reference Jhaveri and Robinson (1965) Phases Lw-H-V... 

Hydrates Methane + nitrogen + (methylcyclohexane or methylcyclopentane) Reference Tohidi et al. (1996a)... 

Figure 6.39 Data for structure H hydrates of methane + nitrogen with cyclohexane, methylcyclopentane, and methylcyclohexane.

Binary Mixtures of Methane + Nitrogen with Inhibitors... 

Figure 6.55 Inhibition of methane + nitrogen hydrates with sodium chloride and magnesium chloride.

Methane/Nitrogen Gas Separation over the Zeolite Clinoptilolite by the Selective Adsorption of Nitrogen... 

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