Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
EXPERIMENTAL PHASE EQUILIBRIUM OF CO2 AND CH4 HYDRATES INHIBITED BY ISOPROPANOL AND SODIUM CHLORIDE
Submission Author:
Luiz Fernando Santos De Vasconcelos , PR
Co-Authors:
Luiz Fernando Santos De Vasconcelos, Thales Sirino, Celina Kakitani, Moisés Marcelino Neto, Rigoberto Morales, Amadeu Sum
Presenter: Luiz Fernando Santos De Vasconcelos
doi://10.26678/ABCM.COBEM2021.COB2021-1478
Abstract
Abstract. Under certain thermodynamic conditions, water molecules can combine with low molecular weight molecules to form crystalline structures known as hydrates. Blocking pipes due to the hydrates formation is a major concern in ensuring flow in the oil and gas industries. The motivation of this study arises from the lack of data in the literature that explores the isopropanol in conditions of a thermodynamic inhibitor or promoter, depending on the formation gas. In the present work, new experimental data for the phase equilibrium of inhibited carbon dioxide and methane hydrates were obtained for pressures between 20 and 260 bar, under concentrations ranging from 1 to 25%, in mass, of isopropanol and concentrations of 5 and 10%, in mass, of NaCl, in a high-pressure cell using the isochoric method. A thermodynamic model, previously developed, was applied and validated with the hydrate equilibrium conditions. This model uses the Cubic Plus Assosiation (CPA) state equation for the fluid phases and a statistical approach, based on the van der Waals-Platteeuw Theory for the hydrated phase. Isopropanol was characterized as an inhibitor of CO2 hydrates and a promoter of CH4 hydrates, collaborating in the structural transition from the sI to the sII type. Keywords: hydrates, carbon dioxide, methane, NaCl, isopropanol, CPA, upper quadruple point.
Keywords
Hydrates, sodium chloride, Isopropanol, Carbon dioxide, methane, CPA, upper quadruple point
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