An improved clapeyron model for predicting high - Pressure gas hydrate phase equilibria

Ali Eslamimanesh (1) , Amir H. Mohammadi (2) , Dominique Richon (2)

1 CEP - Centre Énergétique et Procédés
2 CEP/Fontainebleau

Prediction of gas hydrate phase diagram for the liquid water - hydrate - liquid hydrate former region is a challenge considering this diagram at these conditions is strong function of temperature. The Clapeyron model is traditionally used for this purpose. However, the conventional Clapeyron model does not take into account the effect of pressure on the hydrate molar volume as well as the heat of dissolution of hydrate former in water and therefore cannot predict satisfactorily gas hydrate phase diagram. In this work, the conventional Clapeyron model is extended to take into account the aforementioned factors as well as the change in the slope of the pressure - temperature hydrate phase diagram when increasing the temperature. Three hydrate formers: carbon dioxide, hydrogen sulfide and ethane, are studied. It is found that the effect of these factors on the prediction of the gas hydrate phase diagram is not negligible.

Mots clés: Clapeyron model; Gas hydrates; Heat of dissolution; Hydrate molar volume; Effect of pressure; Heat of dissociation; High pressure gas; Hydrate phase; Liquid water; Molar volumes; Carbon dioxide; Dissociation; Dissolution; Ethane; Forecasting; Gases; Hydration; Hydrogen sulfide; Liquids; Phase diagrams; Phase equilibria; Pressure effects; Volume measurement

Domaines: Génie des procédés

Ali Eslamimanesh, Amir H. Mohammadi, Dominique Richon. An improved clapeyron model for predicting high - Pressure gas hydrate phase equilibria. 2010 AIChE Annual Meeting, Nov 2010, Salt Lake City, United States. ⟨hal-00580841⟩