Phase equilibrium measurements for clathrate hydrates of flue gas (CO2 + N2 + O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide |
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| Institution: | 1. IFP Energies Nouvelles, 1-4 avenue de Bois-Préau, 92852 Rueil-Malmaison, France;2. MINES ParisTech, CEP/TEP – Centre Énergétique et Procédés, 35 Rue Saint Honoré, 77305 Fontainebleau, France;3. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;4. Technical University of Denmark, Center for Energy Resources Engineering (CERE), Department of Chemical and Biochemical Engineering, DK-2800 Kgs. Lyngby, Denmark;1. Center for Energy Resources Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;2. Mines ParisTech PSL Research Université, CTP-Centre Thermodynamic of Processes, 35 Rue Saint Honoré, 77305 Fontainebleau, France;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;2. Chemical Engineering and Process Development Division, National Chemical Laboratory, Pune, India;3. Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, Canada;1. Department of Integrated Energy and Infra System, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea;2. Department of Energy and Resources Engineering, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea |
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| Abstract: | This paper reports the measured hydrate phase equilibria of simulated flue gas (12.6 vol% CO2, 80.5 vol% N2, 6.9 vol% O2) in the presence of tetra-n-butyl ammonium bromide (TBAB) or tri-n-butylphosphine oxide (TBPO), at (0, 5 and 26) wt%, respectively. The measurements of the phase boundary between (hydrate + liquid + vapor) (H + L + V) phases and (liquid + vapor) (L + V) phases were performed within the temperature range (275.97 to 293.99) K and pressure range (1.56 to 18.78) MPa with using the isochoric step-heating pressure search method. It was found that addition of TBAB or TBPO allowed the incipient equilibrium hydrate formation conditions for the flue gas to become milder. Compared to TBAB, TBPO was largely more effective in reducing the phase equilibrium pressure. |
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| Keywords: | Semi-clathrate hydrate Phase equilibrium Carbon dioxide capture Hydrate promoter Gas separation |
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