In this paper, the mass transfer phenomenon during hydrate formation from methane is explained. It is demonstrated that during the hydrate formation of methane, the mass transfer in the liquid side of the contact area of gas-liquid controls the gas consumption. Two types of experiments (isochoric and isobaric) have been conducted in a stirred vessel to indicate that the gas uptake rate is independent of the number of hydrate particles and their total area. Data shows that the mass transfer coefficient is a function of pressure and temperatures. (c) 2012 Elsevier Ltd. All rights reserved.