Binary Mixtures Of Methane Research Articles

Gas-liquid equilibrium in binary mixtures of methane with N-decane, benzene, and toluene

Compositions of saturated equilibrium liquid and vapor phases are determined in a flow apparatus for mixtures of methane and n-decane at 150, 240, 270, 290, and 310/sup 0/C, for methane and benzene at 150, 190, and 230/sup 0/C, and for methane and toluene at 150, 190, 230, and 270/sup 0/C. Pressures extend to near the criticals of the mixtures starting from 20 atm or from somewhat above the vapor pressure of the solvent whichever is higher. 6 figures, 4 tables.

Rotational relaxation in mixtures of methane with helium, argon and xenon

Measurements of ultrasonic absorption have been made in binary mixtures of methane with the noble gases helium, argon and xenon. The absorption coefficients were measured in a single-crystal interferometer at a frequency of 3.001 MHz and a temperature of 308.3 K in the pressure range from 100 to 150 torr. Rotational relaxation times and numbers were derived from the observed absorption. The estimated collision numbers for translational-rotational energy exchange are: Z rot ( CH 4− CH 4) = 12.3, Z rot ( CH 4− He) = 3, Z rot ( CH 4− Ar) = 12, Z rot ( CH 4− Xe) = 27. Calculations of rotational relaxation numbers Z rot of spherical top molecules in an inert gas have been made by Widom and Sather and Dahler. Although their values are higher, they predict the same tendency as we found experimentally.

Experimental heat capacities of carbon dioxide‐methane mixtures at elevated pressures

AbstractThe heat exchanger method of determining the ratio of heat capacity at a pressure to the heat capacity at a low pressure was used to obtain data on two binary mixtures of methane and carbon dioxide containing 14.49 and 42.30 mole % methane. The data were obtained at pressures up to 2,250 psi in the temperature range of ambient to 150°C and are expected to be accurate within ± 0.5 % in the regions removed from the pressure maxima and within ± 1 % in regions close to the maxima. Heat capacities of the two binary mixtures were calculated using the BWR equation of state, the generalized correlations of Curl and Pitzer and Yen and Alexander, and the method of Orentlicher and Prausnitz. The calculated values were compared with the experimental values.

Natural Gas Hydrates at Pressures to 10,000 psia

Abstract This paper presents the results of the data obtained in the first stage of a long-range study at high pressures of the system, vapor-hydrate-water rich liquid-hydrocarbon rich liquid. The data presented are for the three-phase systems in which no hydrocarbon liquid exists. Tests were performed on 10 gases at pressures from 1,000 to 10,000 psia. One of these was substantially pure methane, and the remainder were binary mixtures of methane with ethane, propane, iso-butane and normal butane. Several conclusions may be drawn from the data.Contrary to previous extrapolations, the hydrocarbon mixtures tested form straight lines in the range of 6,000 to 10,000 psia which are parallel to the curves for pure methane, when the log of pressure is plotted vs hydrate formation temperature.The hydrate formation temperature may be predicted accurately at pressures from 6,000 to 10,000 psia by using a modified form of the Clapeyron equation. The total hydrate curve may be predicted by using the vapor-solid equilibrium constants of Carson and Katz to 4,000 psia and joining the two segments with a smooth continuous curve between 4,000 and 6,000 psia.The use of gas specific gravity as a parameter in hydrate correlations is unsatisfactory at elevated pressures.The hydrate crystal lattice is pressure sensitive at elevated pressures. Introduction Prior to 1950 many studies had been made of the hydrate forming conditions for typical natural gases to pressures of 4,000 psia. Most of these attempted to correlate the log of system pressure vs hydrate formation temperature, with gas specific gravity as a parameter. One of the more promising correlations was made by Katz, et al, which utilized vapor-solid equilibrium constants. The only published data above 4,000 psia are those of Kobayashi and Katz for pure methane to a pressure of 11,240 psia. In the intervening years, most published charts for the high-pressure range have represented nothing more than extrapolations of the low-pressure data, with the methane line serving as a general guide. The reliability of these charts has become increasingly doubtful (and critical) in our present technology as we handle more high-pressure systems.

THE EQUATION OF STATE FOR BINARY MIXTURES OF METHANE AND NITROGEN

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE EQUATION OF STATE FOR BINARY MIXTURES OF METHANE AND NITROGENFrederick G. Keyes and Harry G. BurksCite this: J. Am. Chem. Soc. 1928, 50, 4, 1100–1106Publication Date (Print):April 1, 1928Publication History Published online1 May 2002Published inissue 1 April 1928https://doi.org/10.1021/ja01391a018RIGHTS & PERMISSIONSArticle Views85Altmetric-Citations20LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (378 KB) Get e-Alerts Get e-Alerts