2-2-3 Multiple dissociation mechanism model for methane hydrate

Abstract

In this work, a model that can be used in large-scale simulations was developed for studying the dissociation of methane hydrate. In the model, two mechanisms were assumed: (i) dissociation of methane hydrate as as a concentration driving force difference and (ii) decomposition of hydrate host cage of the methane hydrate according to a chemical potential driving force ignoring heat effects of the endothermic reaction. Experimental data of decomposition rates at 278 K, 4.39 MPa were correlated by the model assuming that (i) and (ii) occur in parallel using an effective rate constant of decomposition K as a fitting parameter. As a result, the rate constant of decomposition K was estimated to be 1.73 × 10^-9 at 278 K.