Assessing the Alkyl Chain Effect of Ammonium Hydroxides Ionic Liquids on the Kinetics of Pure Methane and Carbon Dioxide Hydrates

Muhammad Saad Khan, Cornelius Borecho Bavoh, Mohammad Azizur Rahman, Bhajan Lal, Ato Kwamena Quainoo and Abdulhalim Shah Maulud
Additional contact information
Muhammad Saad Khan: Petroleum Engineering Department, Texas A&M University at Qatar, Doha PO Box 23874, Qatar
Cornelius Borecho Bavoh: CO2 Research Centre (CO2RES), Universiti Teknologi PETRONAS, Perak 32610, Malaysia
Mohammad Azizur Rahman: Petroleum Engineering Department, Texas A&M University at Qatar, Doha PO Box 23874, Qatar
Bhajan Lal: CO2 Research Centre (CO2RES), Universiti Teknologi PETRONAS, Perak 32610, Malaysia
Ato Kwamena Quainoo: Petroleum Engineering Department, Universiti Teknologi PETRONAS, Perak 32610, Malaysia
Abdulhalim Shah Maulud: Chemical Engineering Department, Universiti Teknologi PETRONAS, Perak 32610, Malaysia

Energies, 2020, vol. 13, issue 12, 1-18

Abstract: In this study, four ammonium hydroxide ionic liquids (AHILs) with varying alkyl chains were evaluated for their kinetic hydrate inhibition (KHI) impact on pure carbon dioxide (CO 2 ) and methane (CH 4 ) gas hydrate systems. The constant cooling technique was used to determine the induction time, the initial rate of hydrate formation, and the amount of gas uptake for CH 4 -AHILs and CO 2 -AHILs systems at 8.0 and 3.50 MPa, respectively, at 1 wt.% aqueous AHILs solutions. In addition, the effect of hydrate formation sub-cooling temperature on the performance of the AHILs was conducted at experimental temperatures 274.0 and 277.0 K. The tested AHILs kinetically inhibited both CH 4 and CO 2 hydrates at the studied sub-cooling temperatures by delaying the hydrate induction time and reducing the initial rate of hydrate formation and gas uptake. The hydrate inhibition performance of AHILs increases with increasing alkyl chain length, due to the better surface adsorption on the hydrate crystal surface with alkyl chain length enhancement. TPrAOH efficiently inhibited the induction time of both CH 4 and CO 2 hydrate with an average inhibition percentage of 50% and 84%, respectively. Tetramethylammonium Hydroxide (TMAOH) and Tetrabutylammonium Hydroxide (TBAOH) best reduced CH 4 and CO 2 total uptake on average, with TMAOH and Tetraethylammonium Hydroxide (TEAOH) suitably reducing the average initial rate of CH 4 and CO 2 hydrate formation, respectively. The findings in this study could provide a roadmap for the potential use of AHILs as KHI inhibitors, especially in offshore environs.

Keywords: ammonium hydroxide ionic liquids (AHILs); CH 4 hydrate; CO 2 hydrate; alkyl chain; ionic liquids; kinetic hydrate inhibition (KHI) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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