Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon
Abstract: In the present work, the three- and four-phase hydrate equilibria of (carbon dioxide (CO2) + tetrahydrofuran (THF) + water) system are measured by using Cailletet equipment in the temperature and pressure range of (272 to 292) K and (1.0 to 7.5) MPa, respectively, at different CO2 conc...
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| Format: | Citation Index Journal |
| Language: | English |
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ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
2010
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| Online Access: | http://scholars.utp.edu.my/id/eprint/2779/ http://scholars.utp.edu.my/id/eprint/2779/1/Phase-equilibria-in-ternary-%28carbon-dioxide-tetrahydrofuran-water%29-system-in-hydrate-forming-region-Effects-of-carbon-dioxide-concentration-and-the-occurrence-of-pseudo.pdf |
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| author | Khalik M., Sabil Geert-Jan, Witkamp Cor J., Peters |
| author_facet | Khalik M., Sabil Geert-Jan, Witkamp Cor J., Peters |
| author_sort | Khalik M., Sabil |
| building | UTP Institutional Repository |
| collection | Online Access |
| description | Abstract: In the present work, the three- and four-phase hydrate equilibria of (carbon dioxide (CO2) + tetrahydrofuran (THF) + water) system are measured by using Cailletet equipment in the temperature and pressure range of (272 to 292) K and (1.0 to 7.5) MPa, respectively, at different CO2 concentration. Throughout the study, the concentration of THF is kept constant at 5 mol% in the aqueous solution. In addition, the fluid phase transitions of L-w-L-v-V -> L-w-L-v (bubble point) and L-w-L-v-V -> L-w-V (dew point) are determined when they are present in the ternary system. For comparison, the three-phase hydrate equilibria of binary ( CO2 + H2O) are also measured. Experimental measurements show that the addition of THF as a hydrate promoter extends hydrate stability region by elevating the hydrate equilibrium temperature at a specified pressure. The three-phase equilibrium line H-L-w-V is found to be independent of the overall concentration of CO2. Contradictory, at higher pressure, the phase equilibria of the systems are significantly influenced by the overall concentration of CO2 in the systems. A liquid-liquid phase split is observed at overall concentration of CO2 as low as 3 mol% at elevated pressure. The region is bounded by the bubble-points line (L-w-L-v-V -> L-w-L-v), dew points line (L-w-L-v-V -> L-w + V) and the four-phase equilibrium line (H + L-w + L-v + V). At higher overall concentration of CO2 in the ternary system, experimental measurements show that pseudo-retrograde behaviour exists at pressure between (2.5 and 5) MPa at temperature of 290.8 K. (C) 2009 Published by Elsevier Ltd. |
| first_indexed | 2025-11-13T07:28:19Z |
| format | Citation Index Journal |
| id | oai:scholars.utp.edu.my:2779 |
| institution | Universiti Teknologi Petronas |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-13T07:28:19Z |
| publishDate | 2010 |
| publisher | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | oai:scholars.utp.edu.my:27792017-03-20T01:59:56Z http://scholars.utp.edu.my/id/eprint/2779/ Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon Khalik M., Sabil Geert-Jan, Witkamp Cor J., Peters TJ Mechanical engineering and machinery Abstract: In the present work, the three- and four-phase hydrate equilibria of (carbon dioxide (CO2) + tetrahydrofuran (THF) + water) system are measured by using Cailletet equipment in the temperature and pressure range of (272 to 292) K and (1.0 to 7.5) MPa, respectively, at different CO2 concentration. Throughout the study, the concentration of THF is kept constant at 5 mol% in the aqueous solution. In addition, the fluid phase transitions of L-w-L-v-V -> L-w-L-v (bubble point) and L-w-L-v-V -> L-w-V (dew point) are determined when they are present in the ternary system. For comparison, the three-phase hydrate equilibria of binary ( CO2 + H2O) are also measured. Experimental measurements show that the addition of THF as a hydrate promoter extends hydrate stability region by elevating the hydrate equilibrium temperature at a specified pressure. The three-phase equilibrium line H-L-w-V is found to be independent of the overall concentration of CO2. Contradictory, at higher pressure, the phase equilibria of the systems are significantly influenced by the overall concentration of CO2 in the systems. A liquid-liquid phase split is observed at overall concentration of CO2 as low as 3 mol% at elevated pressure. The region is bounded by the bubble-points line (L-w-L-v-V -> L-w-L-v), dew points line (L-w-L-v-V -> L-w + V) and the four-phase equilibrium line (H + L-w + L-v + V). At higher overall concentration of CO2 in the ternary system, experimental measurements show that pseudo-retrograde behaviour exists at pressure between (2.5 and 5) MPa at temperature of 290.8 K. (C) 2009 Published by Elsevier Ltd. ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND 2010-01 Citation Index Journal PeerReviewed application/pdf en http://scholars.utp.edu.my/id/eprint/2779/1/Phase-equilibria-in-ternary-%28carbon-dioxide-tetrahydrofuran-water%29-system-in-hydrate-forming-region-Effects-of-carbon-dioxide-concentration-and-the-occurrence-of-pseudo.pdf Khalik M., Sabil and Geert-Jan, Witkamp and Cor J., Peters (2010) Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon. [Citation Index Journal] http://apps.isiknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=36&SID=X212JDdPAc7358p5C3D&page=1&doc=1 |
| spellingShingle | TJ Mechanical engineering and machinery Khalik M., Sabil Geert-Jan, Witkamp Cor J., Peters Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon |
| title | Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon |
| title_full | Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon |
| title_fullStr | Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon |
| title_full_unstemmed | Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon |
| title_short | Phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: Effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon |
| title_sort | phase equilibria in ternary (carbon dioxide plus tetrahydrofuran plus water) system in hydrate-forming region: effects of carbon dioxide concentration and the occurrence of pseudo-retrograde hydrate phenomenon |
| topic | TJ Mechanical engineering and machinery |
| url | http://scholars.utp.edu.my/id/eprint/2779/ http://scholars.utp.edu.my/id/eprint/2779/ http://scholars.utp.edu.my/id/eprint/2779/1/Phase-equilibria-in-ternary-%28carbon-dioxide-tetrahydrofuran-water%29-system-in-hydrate-forming-region-Effects-of-carbon-dioxide-concentration-and-the-occurrence-of-pseudo.pdf |