(202g) Effect of a Thermodynamic Promoter (TBAB) on Hydrate Phase Equilibria Conditions for Systems Containing Water, Hexane, Octane, Decane, Dodecane, and Carbon Dioxide

Gas hydrates are considered a problem in the oil industries due to the blockages they cause in extraction pipelines. However, there is research that sees gas hydrates as a potential separation technique. The conditions necessary for the formation of gas hydrates mean that it can be a sustainable technique. In this work, the hydrate phase equilibria conditions for multicomponent mixtures containing four alkanes with or without a thermodynamic promoter (Tetra-n-butylammonium bromide) were measured. The studied systems were CO₂ + hexane + octane + decane + dodecane + water and CO₂ + hexane + octane + decane + dodecane + water Tetra-n-butylammonium bromide (TBAB) at mass fraction of the mixed alkanes of (w_MA = 0.1 and 0.3) and at fixed mass fraction of the mixed alkanes of (w_MA = 0.1) with mass fraction of TBAB of (w_TBAB = 0.1 and 0.3). The hydrate phase equilibrium conditions were measured using the non-visual isochoric method by pressure search, finding pressures in the range of (1.34 – 4.37) MPa and temperatures in the range of (274.10 – 291.89) K with an estimated combined uncertainty of 0.02 MPa and 0.10 K for pressure and temperature, respectively. Prior to the experimental measurements, the validation of the experimental method used was carried out through experimental determination and comparison with the international literature of the hydrate phase equilibrium conditions of the pure CO₂ hydrate, obtaining a good agreement with previously published data.