1. Hydrates, Flow Assurance and Phase Equilibria Group, Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh EH14 4AS, Scotland, United Kingdom
2. Laboratoire Réactions et Génie des Procédés (LRGP), UPR 3349 CNRS, Nancy Université, ENSIC, 1, rue Grandville, BP 20451, 54001 Nancy Cedex, France