CATEGORY: IONIC LIQUIDS
Chemical Engineering Science, Volume 87, 14
January 2013, Pages 270–276
The performance of ionic liquids and their
mixtures in inhibiting methane hydrate formation
Anthony R. Richard, Hertanto Adidharma,
Department of Chemical and Petroleum Engineering, University of Wyoming,
Laramie, Wyoming 82071-3295, USA
Abstract
Researchers studied the performance of
1-ethyl-3-methylimidazolium chloride (EMIM-Cl), one of novel ionic liquid
inhibitors for gas hydrate, in inhibiting methane hydrate at low and high ionic
liquid concentrations is investigated in a pressure range of 10–20 MPa.
They also conducted experiments on methane hydrate
dissociation conditions in the presence of mixed ionic liquid and conventional
inhibitors, such as sodium chloride (NaCl) and monoethylene glycol (MEG), as
well as a mixture containing two ionic liquids, EMIM-Cl and
1-ethyl-3-methylimidazolium bromide (EMIM-Br), to investigate any possible
synergistic effects. They observed that single component solutions of EMIM-Cl
demonstrate a progressive increase in inhibition effect with increasing
concentration, which may surpass the effectiveness of MEG at high concentrations.
Although the thermodynamic inhibition performance of the mixtures of EMIM-Cl
and MEG does not show any synergistic effects at low pressures, it does at
higher pressures. The mixture of EMIM-Cl and EMIM-Br also shows a synergistic
effect at higher pressures.
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