Clathrate stability conditions have been modelled for the H 2 O-CO 2 -CH 4 -N 2 -C 2 H 6 fluid system based on all available experimental data. Optimum Kihara parameters are estimated for pure CO 2 , CH 4 , N 2 and C 2 H 6 gas hydrates from using the most accurate calculation of other parameters involved in clathrate modelling, like fugacities, gas solubilities in H 2 O and thermodynamic constants. For mixed gas hydrates of CO 2 -CH 4 , CH 4 -N 2 , and CH 4 -C 2 H 6 excess Gibbs free energy functions are introduced to obtain a good fit to experimental data. The excess Gibbs free energy is described according a modified Margules equation, which depends on mole fraction and temperature.
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Ronald J. Bäkker (1998) studied this question.
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