Research On The Kinetics Of Methane Hydrate Formation In Various Systems

The kinetics of methane hydrate in pure water and the systems containing inhibitors was investigated in this paper. The work can be divided into five parts.In the first part, the status of research on water clusters and the kinetics of hydrate formation are briefly reviewed, the research work investigated by many researchers on hydrate inhibition which is an important problem in the field of hydrate kinetics are discussed in detail from the point of view of thermodynamic inhibition and kinetic inhibition.In the second part, an experimental fit with a larger volume and a higher stirring efficiency for the research was established and improved. In this fit, the methane hydrate formation is more likely to happen. The 44 kinetics experimental data of methane hydrate formation in pure water and in aqueous solution of CHsOH, NaCl and their mixtures were obtained experimentally. The experiment were conducted at pressures ranging from 4.41 to 7.48MPa, temperatures from 273.35 to 273.85K, inhibitor concentrations from l~20wt% and the stirring rate from 200- 400r/min.In the third part, the induction time data during the hydrate formation in various systems were measured experimentally, and the factors that affected the induction time were analyzed.In the fourth part, based on the experimental data from pure water, the kinetic parameters were determined. The representative data of the kinetic experiment in the given experimental condition were also gained.In the last part, the effect of pressure on the estimated kinetic parameters was examined, and the application of the proposed kinetic model to the systems containing various inhibitors was demonstrated. The results show that the proposed kinetic model is capable of describing the kinetic behavior of hydrate formation in various systems. Some abnormal phenomenon during the hydrate formation in the systems containing inhibitors can also be predicted reasonably through this model. The inhibition capability of inhibitors was also studied in this part. Combined with the mechanism of hydrate formation, an explanation to the inhibition mechanism of the inhibitors was given on the molecular scale.