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 to 281.2 K and 1.80 to 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., negative ion of Br, had a slightly better inhibition effect than the bigger negative ions of BF4. Acknowledgements: This research was partially supported by the Industrial Strategic technology development program (10045068), Development of flow assurance and organic acid/calcium removal process for the production of offshore opportunity crude funded By the Ministry of Trade, Industry & Energy (MI, Korea), partially supported by the MSIP (Ministry of Science, ICT and Future Planning), Korea, under the C-ITRC (Convergence Information Technology Research Center) (IITP-2015-H8601-15-1008) supervised by the IITP (Institute for Information & communications Technology Promotion), and partly supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2015R1A1A1A05027643). We also thank the Korea Basic Science Institute for the technical support.

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

251st National Meeting (2016)

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