Study of the Methane Hydrate Stability Under Various State of Temperature and Pressure

Document Type : Research Article

Authors

Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-143 Tehran, I.R. IRAN

Abstract

Since The stability of methane hydrate is vital for storage and transport of natural gas, the effects of temperature and initial gas content on the dissociation rate of methane hydrate have been investigates. In order to formation of hydrate with various initial gas contents, the formation experiments have been accomplished in different condition. After formation of hydrate, the dissociation experiments have been performed at atmospheric pressure, different temperatures (ranging from 270.2 K to 262.2 K) and various initial gas  in hydrate (n0=0.03 & n0=0.06). In constant temperature, the results show that the dissociation rate and instability of hydrate decreases, because an ice layer covers the hydrate surface. This phenomenon is called self-preservation effect of gas hydrate. Also the dissociation rate decreases with reduction of temperature. Increase in the initial gas content in hydrate, results in the increment of the dissociation percentage of hydrate, since the quantity of ice has been reduced in the system. A model has been developed for prediction of methane hydrate dissociation percent by correlating the experimental data received from the related experiments.  

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References

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