The Occurrence of Methane Hydrate in Ternary and Quaternary Systems of Methane, Water, Certain Organics, and Sodium Chloride

• Published in: Annals of the New York Academy of Sciences
• Main Authors: MOOIJER‐van den HEUVEL, M. M., REUVERS, M., De DEUGD, R. M., PETERS, C. J., De SWAAN ARONS, J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2000
• Subjects: History and Philosophy of Science; General Biochemistry, Genetics and Molecular Biology; General Neuroscience; Methane hydrate
• Online Access: http://dx.doi.org/10.1111/j.1749-6632.2000.tb06805.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1749-6632.2000.tb06805.x; https://nyaspubs.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1749-6632.2000.tb06805.x

A bstract : From literature it is known that sodium chloride (NaCl) exerts a strong pressure enhancing effect on the three‐phase equilibrium liquid water‐hydrate‐vapor (L w ‐H‐V) in the ternary system water + methane + sodium chloride (H 2 O + CH 4 +?NaCl). However, on the other hand, it recently became apparent that certain water‐soluble organic components, present in low concentrations in the aqueous phase, exert the opposite effect on the equilibrium pressure of the three‐phase equilibrium L w ‐H‐V. Compared to the hydrate equilibrium pressure of the organic free liquid phase, pressure reductions as high as 80% have been observed. This paper reports on experimental results of the competitive effect on the equilibrium pressure of the three‐phase equilibrium L w ‐H‐V, of both NaCl and the water‐soluble organic component 1,3‐dioxolane. We also consider the effect on the hydrate equilibrium pressure of organic components that are very poorly soluble in water, for example, tetrahydropyran, cyclobutanone, methylcyclohexane, fluoroform (CHF 3 ), and tetrafluoromethane (CF 4 ). These poorly water‐soluble components are referred to as water‐insoluble.