International Conference on Gas Hydrates (ICGH) (6th : 2008)

EXPERIMENTAL AND COMPUTATIONAL INVESTIGATION OF PROMOTER-STABILIZED CLATHRATE HYDRATES OF NOBLE GASES Papadimitriou, Nikolaos I.; Stubos, Athanassios K.; Florusse, Louw J.; Peters, Cor J.

Abstract

It has been found that helium gas can stabilize the THF hydrate (of the sII type). Dissociation temperatures of the binary He-THF hydrates are significantly higher than those of pure THF hydrates at the same pressure. In order to investigate the distribution of He molecules within the cavities of this hydrate, Grand Canonical Monte Carlo simulations have been utilized. A wide pressure range (up to 700 MPa) has been examined. The results of these simulations show that the small cavity of the binary He-THF hydrate is able to accommodate up to three He molecules resulting in a He content of 6.0 wt. % at 700 MPa. Contrary to the similar case of binary H2-THF hydrate, He content as a function of pressure does not present a plateau, at least over the pressure range examined. Moreover, similar simulations on a hypothetical sII hydrate of pure He show that the large cavity of this hydrate could be occupied by up to ten He molecules in the pressure range under question.

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