Predictions of hydrate formation for systems containing hydrogen

Abstract

The hydrogen hydrate technology attracts more interests for hydrogen storage and purification. In this work, the Patel–Teja equation of state (PT EOS) with the one-fluid mixing rules was applied to the fugacity calculations in vapor and liquid phases and the Chen–Guo hydrate model to the hydrate phase. By treating hydrogen as a hydrate former, the measured data on hydrate formation conditions in a variety of hydrogen concentrations were used to determine the parameters of hydrogen in the hydrate model. Considering tetrahydrofuran (THF) is frequently used as a thermodynamic promoter in the development of hydrate-based technology, which can reduce the hydrate formation pressure, especially when hydrogen exists, the modeling investigation was conducted for systems containing hydrogen in the presence of THF. A cubic plus association (CPA) type EOS was used and parameters were determined by correlating the vapor–liquid equilibrium data of THF+water system, where PT EOS was used as physical term. The model proposed in this study was applied to the hydrate formation calculations for mixtures containing hydrogen. A satisfactory agreement between the predicted results and the experimental data from the literature was reached.