hr Thermodynamic modeling of methane hydrate equilibrium conditions in the presence of imidazolium based ionic liquids with the van der Waals-Platteeuw solid solution approach along with SRK and CPA EoS

Autor(es)

Nascimento, Debora Costa do ; Pelaquim, Fernanda Paludetto ; Bertoncin, Thiago Alves ; Neto, Antonio Marinho Barbosa ; da Costa, Mariana Conceicao

• Tipo de documento: Artigo Científico
• Fonte: Fluid Phase Equilibria; v. 571, p. 9-pg., 2023-05-02.

Resumo

Gas hydrates are solid solutions which cause flow assurance problems and risks to line integrity in the petroleum industry. Thermodynamic inhibitors are usually injected during production to avoid hydrate formation. In recent years, many authors have reported Ionic Liquids (ILs) as inhibitors. However, there are not many studies on thermodynamic modeling in the literature involving ILs as hydrate inhibitors, especially when it comes to the applicability of the Cubic Plus Association (CPA) and Soave-Redlich Kwong (SRK) Equation of State. In light of this, the aim of this work was to evaluate methane hydrate equilibrium in the presence of ILs as inhibitors using van der Waals-Platteeuw solid solution theory along with these Equations of State to describe liquid and gas phases. The commercial software Multiflash and its interface with excel were employed to calculate hydrate equilibrium pressures. Data from the literature on 12 imidazolium-based ILs were taken into account by varying carbon chain length and anion basicity. Both Equations of State resulted in accurate equilibrium predictions with similar deviations between calculated and experimental data (overall ARD 4.64% for CPA, and 4.49% for SRK) considering p and T conditions in the range of 2.5-35 Mpa and 272-295 K respectively. 2B association was considered for ILs, while 4C association was used for water. In general, longer cation carbon chain lengths and higher anion basicity resulted in lower accuracy. (AU)

• Processo FAPESP: 22/05244-4 - Líquidos iônicos próticos como inibidores de hidratos
• Beneficiário: Débora Costa do Nascimento
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 18/19198-9 - Determinação de dados de solubilidade de gases leves em Deep eutectic solvents a altas pressões
• Beneficiário: Fernanda Paludetto Pelaquim
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 20/06315-7 - Líquidos iônicos próticos como inibidores da formação de hidratos
• Beneficiário: Débora Costa do Nascimento
• Modalidade de apoio: Bolsas no Brasil - Doutorado