Abstract
In our previous studies, it was proven that ionic liquids can be a good synergist with poly(N-vinylcaprolactam) [PVCap, a polymeric kinetic hydrate inhibitor (KHI)] against methane or natural gas hydrate formation. In particular, 1-hexyl-1-methylpyrrolidinium tetrafluoroborate (HMP-BF4) showed the best performance for natural gas hydrate inhibition among the ionic liquids tested. In this study, we report the result of performance tests on kinetic inhibition of natural gas hydrate formation with a mixture of PVCap and HMP-BF4 in the presence of an additional oil phase. At various water cuts (20, 50, and 80%) with 3.5 wt % aqueous NaCl solution and mineral oil, the KHI performance of PVCap alone and a mixture of 0.5 wt % PVCap and 0.5 wt % HMP-BF4 was evaluated. This was performed by measuring the induction time for the synthetic natural gas hydrate formation, in addition to the pressure, temperature, and torque of the system investigated. Calculations were carried out to determine the amount of water conve...
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