An Experimental Study on the Kinetics of Natural Gas Hydrate Formation in Pure Water Using NF Unit Gas at Bandar Imam Petrochemical Plant

Understanding gas hydrate formation conditions is crucial for designing natural gas transmission pipelines. These compounds are studied from both thermodynamic and kinetic perspectives. Despite significant advances in the thermodynamic aspect of hydrates, kinetic investigations still demand further research. Accordingly, in order to determine the equilibrium conditions of natural gas hydrate formation, six independent experiments were conducted using natural gas samples from the NF unit of the Bandar Imam Petrochemical Complex. The tests were carried out in a fixed-volume reactor at temperatures of ۲۷۸.۳, ۲۷۸.۶, ۲۸۴.۸, ۲۹۰.۳, ۲۷۹.۳, and ۲۸۰.۶ K, and pressures of ۳۷.۸, ۱۹.۳, ۲۸.۴, ۵۲.۲, ۳۲.۷, and ۱۶.۲ bar, respectively. The experimental results showed that the mass transfer coefficients were ۰.۳۴۳, ۰.۲۳۶, ۰.۲۰۰, ۰.۳۱۴, ۰.۲۹۷, and ۰.۱۶۶ m/s, while the molecular diffusion coefficients were ۲.۵۹۶۸ ×۱۰^(-۹), ۶.۲۸۶۶×۱۰^(-۹), ۳.۳۹۳۱×۱۰^(-۹), ۱.۴۹×۱۰^(-۹), ۴.۲۸×۱۰^(-۹), and ۷.۴۲×۱۰^(-۹) m²/s, respectively. These findings indicate that an increase in reactor temperature leads to a decrease in mass transfer coefficient and an increase in molecular diffusion coefficient, whereas an increase in pressure results in a rise in mass transfer coefficient and a decrease in molecular diffusion coefficient. These trends are consistent with established empirical correlations

کلیدواژه ها:

Hydrate Formation Rate ، Natural gas ، Kinetics ، Molecular Diffusion Coefficient ، Mass Transfer Coefficient