Methane, properties

Catalysts. The methanation of CO and C02 is catalyzed by metals of Group VIII, by molybdenum (Group VI), and by silver (Group I). These catalysts were identified by Fischer, Tropsch, and Dilthey (18) who studied the methanation properties of various metals at temperatures up to 800°C. They found that methanation activity varied with the metal as follows ruthenium > iridium > rhodium > nickel > cobalt > osmium > platinum > iron > molybdenum > palladium > silver. 

Table 2-5. Methane Properties Compared to Gasoline and Diesel Fuel...

The virial equation as a power series of the pressme is to be used in an application for a quick estimation of the pressure-volume relationship of methane at a constant temperature of 200 K. In this application the speciflc volume of methane varies over a range from 2 to 4 mVkmol. Estimate the second and third virial coefficients over this range based on data derived from the Soave equation of state at the range limits. Methane properties Tc = 190.6 K, Pc = 4599 kPa, to = 0.012. 

Abe, T., M. Tanizawa, K. Watanabe and A. Taguchi (2009) CO2 methanation property of Ru nanoparticle-loaded Ti02 prepared by a polygonal barrel-sputtering method. Energy and Environmental Science 2, 315-332... 

Abe, T. Tanizawa, M. Watanabe, K. Taguchi, A. CO Methanation Property of Ru Nanoparticle-Loaded TiO Prepared by a Polygonal Barrel-Sputtering Method Energy. Environ. Sci. 2009,2, 315-321. 

Properties Methanol Ethanol Propane Methane Isoctane Unleaded gasoline Diesel fuel 2... 

The physical properties of hydrofluorocarbons reflect their polar character, and possibly the importance of intermolecular hydrogen bonding (3). Hydrofluorocarbons often bod higher than either their PFC or hydrocarbon counterparts. For example, l-C H F bods at 91.5°C compared with 58°C for n-Q and 69°C for Within the series of fluorinated methanes, the boiling point reaches a maximum for CH2F2, which contains an equal... 

Properties. The physical properties of aHphatic fluorine compounds containing chlorine are similar to those of the PECs or HECs (3,5). They usually have high densities and low boiling points, viscosities, and surface tensions. The irregularity in the boiling points of the fluorinated methanes, however, does not appear in the chlorofluorocarbons. Their boiling points consistently increase with the number of chlorines present. The properties of some CECs and HCECs are shown in Tables 3 and 4. 

Methane, ethane, and propane are the first three members of the alkane hydrocarbon series having the composition, Selected properties of these... 

Table 1. Selected Properties of Methane, Ethane, and Propane ...

Qiana, introduced by Du Pont in 1968 but later withdrawn from the market, was made from bis(4-aminocyclohexyl)methane and dodecanedioic acid. This diamine exists in several cis—trans and trans—trans isomeric forms that influence fiber properties such as shrinkage. The product offered silk-like hand and luster, dimensional stabiUty, and wrinkle resistance similar to polyester. The yam melted at 280°C, had a high wet glass-transition temperature of - 85° C and a density of 1.03 g/cm, the last was lower than that of nylon-6 and nylon-6,6. Qiana requited a carrier for effective dyeing (see Dye carriers). 

Methane Sulfonyl Chloride (MSC)—Properties, Reactions and Applications, Technical Bulletin S-104, Elf Atochem North America, Philadelphia, Pa. 

G s-Ph se Synthesis. A gas-phase synthesis route to making fine, pure SiC having controllable properties has been described (78,79). Methane was used as a carbon source if required, and the plasma decomposition of three feedstocks, siUcon tetrachloride [10026-04-7] SiCl, dimethyl dichi orosilane, and methyltrichlorosilane [75-79-6] CH Cl Si, into fine SiC powders was investigated. 

Instead of conversion, some producers prefer to use other identifications of severity, including coil outlet temperature, propylene to methane ratio, propylene to ethylene ratio, or cracking severity index (33). Of course, all these definitions are somewhat dependent on feed properties, and most also depend on the operating conditions. 

Methane is the main constituent, with a boiling point of 119 K (—245°F). Ethane, with a boiling point of 184 K (—128°F) may be present in amounts up to 10 percent propane, with a boiling point of 231 K (—44°F), up to 3 percent. Butane, pentane, hexane, heptane, and octane may also be present. Physical properties of these hydrocarbons are given in Sec. 2. 

A closer analysis of die equilibrium products of the 1 1 mixture of methane and steam shows the presence of hydrocarbons as minor constituents. Experimental results for die coupling reaction show that the yield of hydrocarbons is dependent on the redox properties of the oxide catalyst, and the oxygen potential of the gas phase, as well as die temperamre and total pressure. In any substantial oxygen mole fraction in the gas, the predominant reaction is the formation of CO and the coupling reaction is a minor one. 

Furthermore, appreeiahle differenees ean arise from simply using different sourees of data on gas properties. There are very few ealeu-lated power requirements for a easeade proeess under praetieal operating eonditions that have been published and, therefore, available for a direet eomparison between the two proeesses. Additionally, published figures on the aetual power requirements for many easeades are aetually for natural gas, whereas the ealeulated figures are based on the liquefaetion of pure methane. 

The process gas of ethylene plants and methyl tertiary butyl ether plants is normally a hydrogen/ methane mixture. The molecular weight of the gas in such processes ranges from 3.5 to 14. The tliermodynamic behavior of hydrogen/methane mixtures has been and continues to be extensively researched. The gas dynamic design of turboexpanders, which are extensively used in such plants, depends on the equations of state of the process gas. Optimum performance of the turboexpander and associated equipment demands accurate thermodynamic properties for a wide range of process gas conditions. 

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