scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Experimental measurement of hydrate numbers for methane and ethane and comparison with theoretical values

01 May 1970-Industrial & Engineering Chemistry Fundamentals (American Chemical Society)-Vol. 9, Iss: 2, pp 237-243
TL;DR: Methane and ethane hydrate number measurement, alleviating liquid water occlusion and evaluating pressure effect was performed in this paper, where the number was derived from the number of molecules in the mixture.
Abstract: Methane and ethane hydrate number measurement, alleviating liquid water occlusion and evaluating pressure effect
Citations
More filters
Journal ArticleDOI
TL;DR: Raman spectra of clathrate hydrate guest molecules are presented for three known structures (I (sI), II (sII), and H (sH)) in the following systems:
Abstract: Raman spectra of clathrate hydrate guest molecules are presented for three known structures (I (sI), II (sII), and H (sH)) in the following systems: CH4 (sI), CO2 (sI), C3H8 (sII), CH4 + CO2 (sI), CD4 + C3H8 (sII), CH4 + N2 (sI), CH4 + THF-d8 (sII), and CH4 + C7D14 (sH). Relative occupancy of CH4 in the large and small cavities of sI were determined by deconvoluting the ν1 symmetric bands, resulting in hydration numbers of 6.04 ± 0.03. The frequency of the ν1 bands for CH4 in structures I, II, and H differ statistically, so that Raman spectroscopy is a potential tool to identify hydrate crystal structure. Hydrate guest compositions were also measured for two vapor compositions of the CH4 + CO2 system, and they compared favorably with predictions. The large cavities were measured to be almost fully occupied by CH4 and CO2, whereas only a small fraction of the small cavities are occupied by CH4. No CO2 was found in the small cavities. Hydration numbers from 7.27 to 7.45 were calculated for the mixed hydrate.

550 citations

Journal ArticleDOI
TL;DR: In this article, the Tian-Calvet heat-flow calorimeter was used to measure the enthalpy of dissociation for clathrate hydrates of methane, ethane, and propane.

333 citations

Journal ArticleDOI
TL;DR: In this paper, Pitzer et al. used the Ionic interaction approach to calculate the stability and solubility of methane hydrate in seawater and pore water equilibrated with hydrogen carbonate ions.

238 citations

Journal ArticleDOI
TL;DR: In this article, an improved model for the prediction of phase equilibria and cage occupancy of CH 4 and CO 2 hydrate in aqueous systems is presented, which uses atomic site-site potentials to account for the angledependent molecular interactions with parameters directly from ab initio calculation results.

188 citations

Journal ArticleDOI
TL;DR: In this article, a direct derivation of the standard empty hydrate lattice fugacity has been given, which allows for description of the hydrate phase itself, instead of a specific phase change.

167 citations