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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Main Authors: Khalik M., Sabil, Geert-Jan, Witkamp, Cor J., Peters
Format: Citation Index Journal
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.2779 /
Published: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND 2010
Subjects:
TJ Mechanical engineering and machinery
Online Access: http://eprints.utp.edu.my/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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spelling utp-eprints.27792017-03-20T01:59:56Z 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 http://eprints.utp.edu.my/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 http://apps.isiknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=36&SID=X212JDdPAc7358p5C3D&page=1&doc=1 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://eprints.utp.edu.my/2779/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
topic TJ Mechanical engineering and machinery
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
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.
format Citation Index Journal
author Khalik M., Sabil
Geert-Jan, Witkamp
Cor J., Peters
author_sort Khalik M., Sabil
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_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_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_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
publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
publishDate 2010
url http://eprints.utp.edu.my/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
http://apps.isiknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=36&SID=X212JDdPAc7358p5C3D&page=1&doc=1
http://eprints.utp.edu.my/2779/
_version_ 1741196061093920768
score 11.62408

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