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A Simplified Approach to Modeling the Rate of Formation of Gas Hydrates Formed from Mixtures of Gases

Experiments were conducted in a semibatch stirred tank reactor, equipped with an in situ particle size analyzer, to study the rate of formation of hydrates from mixtures of carbon dioxide and methane. Two gas mixtures of CO2 (1) + CH4 (2), one with x1 = 0.4 and the other with x1 = 0.6, were used in the current study. The experimental temperature ranged from 274 to 276 K and the experimental pressure ranged from 20 to 27 bar absolute. The range of temperatures was bounded by the freezing point of water and the temperature at which the CO2 vapor pressure curve intersects the methane hydrate curve. Initially, the results were analyzed using the kinetic model of Englezos et al. (Chem. Eng. Sci. 1987, 42, 2659−2666). After a careful re-examination of the model of Englezos et al., it was realized that the mathematical model for gas hydrate formation from gas mixtures could be simplified by directly incorporating the hydrate phase stoichiometry. The new approach has the added advantage that the intrinsic rate co...

Authors:   Carlos Giraldo; Brij Maini; Raj Bishnoi; Matthew Clarke
Journal:   Energy & Fuels
Year:   2013
DOI:   10.1021/ef301483h
Publication date:   01-Mar-2013
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