Abstract
Is it possible to slow down gas hydrate nucleation by introducing additional surfaces into the system? This process usually occurs at phase boundaries, i.e., the appearance of new surfaces (solid particles) in the system should rather increase the probabilityof hydrate formation. In this work, the effect of carboxylated cellulose nanofibrils (CNF) dispersed in water on the formationof methane hydrate under intensive stirring was investigated. It was found that, under identical conditions, 0.5 mass% CNF allowed reducing the hydrate nucleation rate and suppressing the "memory" effect characteristic for hydrate formation from distilled water (DW). The analysis of the "survival" functions revealed that the mechanism of the CNF inhibitory action is to reduce the number of hydrate nucleation centers. This can be explained by the participation of CNF in the disturbance of the hydrogen bond network:for example, mechanical "destruction" of pre-critical nuclei by inhibitor particles under intensive stirring. The data obtained suggest the development of a new class of kinetic hydrate inhibitors based on dispersions.
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