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Incipient equilibrium hydrate formation conditions for the methane–carbon dioxide–neohexane–water system were obtained by employing the isothermal pressure search method. Two gas mixtures containing 80 and 50% methane respectively on a water-free basis were used.
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At a given temperature, the incipient hydrate formation pressure from the 80–20 gas mixture with neohexane was found to be lower by about 1 MPa from the hydrate formation pressure for the system without neohexane. This is considered to be an indication that structure H hydrate forms. The results for the 50–50 gas mixture, however, indicate that only below a temperature of approximately 277.5 K it is possible to form structure H hydrate. Previous article in issue. Next article in issue.