(632c) Experimental Determination of the Hydrate Phase Equilibria for H2o + C14H30 + C6H14 + C3H8o + CO2 System

Hydrates are inclusion compounds like ice made up of water and small gas molecules like CH₄ or CO₂ under specific conditions of pressure and temperature (high pressures and low temperatures). The hydrates have properties that involve a large capacity of gas storage, fractionation of gas mixtures among many others. In addition to the latter important applications, hydrates have been extensively researched as a potential to cause operational problems in the oil industry (flow restriction, blockage, and hindrance of oil and gas pipelines). In addition, depending on the application, inhibition or promotion of gas hydrate formation is required. Alcohols and glycols are generally used to inhibit gas hydrate formation due to their disruption of the water’s hydrogen bonding network (reducing hydrate stability) which shifts the hydrate equilibrium conditions to lower temperature and higher pressure. In this work, hydrate dissociation conditions for H₂O + C₁₄H₃₀ + C₆H1₄ + CO₂ system and the effect of 1-propanol (C₃H₈O) are analyzed and reported. The experimental measurements were performed using a synthetic nonvisual method. The experimental uncertainties were determined for pressure and temperature as combined uncertainties of 0.03 MPa and 0.30 K, respectively. The relative standard uncertainty in composition was estimated to be 0.010 in mass fraction. The hydrate dissociation conditions studied here are part of a project currently underway at the Thermodynamics Laboratory of the ESIQIE (Instituto Politécnico Nacional, México). Its main objective is to perform systematic studies of hydrate equilibrium data (temperature and pressure) of mixtures containing CO₂/N₂and liquid alkanes (from hexane to dodecane) in order to explore the possible application of the hydrate technique in the separation of water from this kind of compound.