Thermodynamic inhibition of CO₂ hydrate in the presence of morpholinium and piperidinium ionic liquids

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• 作者：Jong-Ho Cha^a ; Chihyeon Ha^a ; Seong-Pil Kang^b ; Jeong Won Kang^c ; ^d ; ^{jwkang@ut.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; Ki-Sub Kim^a ; ^{kks1114@ut.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ionic liquid ; Gas hydrate ; Inhibitor ; Phase equilibrium ; Flow assurance
• 刊名：Fluid Phase Equilibria
• 出版年：2016
• 出版时间：15 April 2016
• 年：2016
• 卷：413
• 期：Complete
• 页码：75-79
• 全文大小：491 K

文摘

The phase equilibrium conditions of CO₂ hydrates were examined in the presence of morpholinium and piperidinium ionic liquids (ILs) with a mass fraction of 0.1. The equilibrium conditions were in the ranges of (274.6–281.2) K and (1.80–3.95) MPa. The addition of ILs shifted the hydrate equilibrium conditions to a higher pressure and lower temperature region compared to the hydrate formed from pure water. Piperidinium and morpholinium ILs showed similar inhibition effects in the higher temperature range ≥278.5 K, whereas at lower temperature piperidinium ILs had a slightly better inhibition effect than morpholinium ILs. The anionic species also affected the hydrate inhibition effectiveness. Smaller anions, i.e., Br⁻, had a slightly better inhibition effect than the bigger ions of ${\text{BF}}_4^{-}$.