Ionic liquids for the inhibition of gas hydrates. A review

Ul Haq, I. and Qasim, A. and Lal, B. and Zaini, D.B. and Foo, K.S. and Mubashir, M. and Khoo, K.S. and Vo, D.-V.N. and Leroy, E. and Show, P.L. (2022) Ionic liquids for the inhibition of gas hydrates. A review. Environmental Chemistry Letters.

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Abstract

The formation of gas hydrates is a major issue during the operation of oil and gas pipelines, because gas hydrates cause plugging, thereby disrupting the normal oil and gas flows. A solution is to inject gas hydrate inhibitors such as ionic liquids. Contrary to classical inhibitors, ionic liquids act both as thermodynamic inhibitors and hydrate inhibitors, and as anti-agglomerates. Imidazolium-based ionic liquids have been found efficient for the inhibition of CO2 and CH4 hydrates. For CO2 gas hydrates, N-ethyl-N-methylmorpholinium bromide showed an average depression temperature of 1.72 K at 10 wt concentration. The induction time of 1-ethyl-3-methyl imidazolium bromide is 36.3 h for CO2 hydrates at 1 wt concentration. For CH4 hydrates, 1-ethyl-3-methyl-imidazolium chloride showed average depression temperature of 4.80 K at 40 wt. For mixed gas hydrates of CO2 and CH4, only quaternary ammonium salts have been studied. Tetramethyl ammonium hydroxide shifted the hydrate liquid vapour equilibrium to 1.56 K at 10 wt, while tetrabutylammonium hydroxide showed an induction time of 0.74 h at 1 wt concentration. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

Item Type: Article
Impact Factor: cited By 1
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 17 Mar 2022 03:08
Last Modified: 17 Mar 2022 03:08
URI: http://scholars.utp.edu.my/id/eprint/28966

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